|
Unusual functions of cheap parts
On Wed, 30 Nov 2005 15:09:49 -0500, Spehro Pefhany wrote:
On Wed, 30 Nov 2005 18:23:05 GMT, the renowned Rich Grise wrote: On Tue, 29 Nov 2005 18:00:50 +0100, Henning Paul wrote: Spehro Pefhany schrieb: I think I remember something like that, maybe with ground beef. You mean Labskaus? http://en.wikipedia.org/wiki/Labskaus Here in Bremen/Germany we usually leave away the fish and use just Corned Beef (the brazilian Corned Beef is just fine). And sometimes, you find diced pickles in it. Tastes even better, then. Looks a lot like ordinary corned beef hash to me, if a little less coarsely chopped. But I wonder why they serve it with one of these? http://www2.catalognavigator.com/lib...op?plpver=1001 ;-) Rich You could also serve with one of these: http://upload.wikimedia.org/wikipedi...zimmer1886.jpg From a cursory search, it looks like it'd be kinda hard to find one these days. ;-) Cheers! Rich |
Unusual functions of cheap parts
On Wed, 30 Nov 2005 21:57:50 GMT, the renowned Rich Grise
wrote: On Wed, 30 Nov 2005 15:09:49 -0500, Spehro Pefhany wrote: On Wed, 30 Nov 2005 18:23:05 GMT, the renowned Rich Grise wrote: On Tue, 29 Nov 2005 18:00:50 +0100, Henning Paul wrote: Spehro Pefhany schrieb: I think I remember something like that, maybe with ground beef. You mean Labskaus? http://en.wikipedia.org/wiki/Labskaus Here in Bremen/Germany we usually leave away the fish and use just Corned Beef (the brazilian Corned Beef is just fine). And sometimes, you find diced pickles in it. Tastes even better, then. Looks a lot like ordinary corned beef hash to me, if a little less coarsely chopped. But I wonder why they serve it with one of these? http://www2.catalognavigator.com/lib...op?plpver=1001 ;-) Rich You could also serve with one of these: http://upload.wikimedia.org/wikipedi...zimmer1886.jpg From a cursory search, it looks like it'd be kinda hard to find one these days. ;-) Cheers! Rich He looks like this these days: http://www.gdh-imports.com/acatalog/04GE01.jpg Best regards, Spehro Pefhany -- "it's the network..." "The Journey is the reward" Info for manufacturers: http://www.trexon.com Embedded software/hardware/analog Info for designers: http://www.speff.com |
Unusual functions of cheap parts
Jim Thompson wrote: On Sat, 26 Nov 2005 21:41:06 +0100, Winfried Salomon wrote: Hello Jorgen, Jorgen Lund-Nielsen wrote: [.....] 2N2369 for fast pulses. btw, do you know a standard complementary pnp-transistor for the 2N2369, such like 2N3905 but with higher ft and less feedback capacitance? It seems that the manufactorers have almost no data on their internet pages. mfg. Winfried A 2N2369 is a gold-doped NPN, gold-doped to kill storage time and improve recovery from saturation. I don't recall any PNP device with gold-doping... or the equivalent. ...Jim Thompson National Semi's (now Fairchild) 2n5771 was a gold-doped PNP. ft=850MHz. For avalanche mode one might try the lower-Vce-rated PN3640 (12v), or PN3639 (6v). I might even have notes on this. I tested/compared various BJTs in avalanche mode some years ago, trying to find the "best." ISTR picking the 2n2369, both because it was fast, and because it avalanched reliably where other types wouldn't. James Arthur |
Unusual functions of cheap parts
|
Unusual functions of cheap parts
John Larkin wrote: On 30 Nov 2005 14:32:29 -0800, wrote: Jim Thompson wrote: snip quote A 2N2369 is a gold-doped NPN, gold-doped to kill storage time and improve recovery from saturation. I don't recall any PNP device with gold-doping... or the equivalent. ...Jim Thompson National Semi's (now Fairchild) 2n5771 was a gold-doped PNP. ft=850MHz. For avalanche mode one might try the lower-Vce-rated PN3640 (12v), or PN3639 (6v). I might even have notes on this. I tested/compared various BJTs in avalanche mode some years ago, trying to find the "best." ISTR picking the 2n2369, both because it was fast, and because it avalanched reliably where other types wouldn't. James Arthur Hi, James, Interestingly, the best avalanchers aren't usually super-fast transistors, but old klunky things. The Zetex avalanche transistors have lowish Ft's and are made in Russia, maybe on an old process. John Howdy John, I was unclear: by "...it was fast..." I meant the 2n2369 was one of the devices with the fastest avalanche edges. Digging through some of my notes, I don't see the BJT comparison, but a 2n2222 biased to +100Vce, banged / triggered by a 74HC-series gate, gave synchronous 750pS risetime pulses. Not very impressive, really, though good for higher-power stuff than I needed. Interestingly, I found a 74AC00 driving an MPS2369 was faster & less trouble: 360pS fall (turn on) time, & 570pS rise (turn off) time, and no nasty high voltage supplies. It was possibly even a little faster than measured--at 360pS I was pushing my poor little 7S14 1-GHz sampling plug-in pretty hard. Best, James |
Unusual functions of cheap parts
Winfried Salomon wrote...
Jorgen Lund-Nielsen wrote: Winfried Salomon wrote: btw, do you know a standard complementary pnp-transistor for the 2N2369, such like 2N3905 but with higher ft and less feedback capacitance? It seems that the manufactorers have almost no data on their internet pages. Maybe 2N4261? Have not looked into the datasheet, but as i remember, i have seen them sometimes in complementary with the 2N2369 That was a high-frequency part for the time, spec'd at 1200MHz... the problem is, that it is an rf-transistor and can't be driven at 30V/0.2A, I found a complementary in an old table KTT, the 2N2894A, but it also has max. 12V, so I find no other than the 2N3906. An old Raytheon datasheet says the 2N2894 was doped with platinum. BTW -- in AoE, we list the 2n5771 as a PNP complement to the NPN 2n5769, both 15V plastic versions of older metal-can parts. -- Thanks, - Win |
Unusual functions of cheap parts
On Wed, 30 Nov 2005 17:11:17 -0500, Spehro Pefhany wrote:
On Wed, 30 Nov 2005 21:57:50 GMT, the renowned Rich Grise wrote: On Wed, 30 Nov 2005 15:09:49 -0500, Spehro Pefhany wrote: On Wed, 30 Nov 2005 18:23:05 GMT, the renowned Rich Grise wrote: On Tue, 29 Nov 2005 18:00:50 +0100, Henning Paul wrote: Spehro Pefhany schrieb: I think I remember something like that, maybe with ground beef. You mean Labskaus? http://en.wikipedia.org/wiki/Labskaus Here in Bremen/Germany we usually leave away the fish and use just Corned Beef (the brazilian Corned Beef is just fine). And sometimes, you find diced pickles in it. Tastes even better, then. Looks a lot like ordinary corned beef hash to me, if a little less coarsely chopped. But I wonder why they serve it with one of these? http://www2.catalognavigator.com/lib...op?plpver=1001 ;-) Rich You could also serve with one of these: http://upload.wikimedia.org/wikipedi...zimmer1886.jpg From a cursory search, it looks like it'd be kinda hard to find one these days. ;-) Cheers! Rich He looks like this these days: http://www.gdh-imports.com/acatalog/04GE01.jpg I was thinking of the "bismark roll", which I had thought was some kind of jelly donut, or "bismark donut", which would be like a jelly roll. But I can't find a single reference to the thing except at the wikipedia disambiguator page, and all it has is the blurb, something like what I said. Oh, well. :-) Thanks! Rich |
Unusual functions of cheap parts
Thank you Jim for your longly explanations. I already knew the charge
storage process, but the phasing aspect was new and interesting. My question about phase delay was in another direction. To be concrete: How to delay (=phase shift) a 145MegHz signal (mostly sinus waveform) with a snap diode? After reading your explanation I cannot see how to achieve a non-snapping action here. Maybe that would work with the diode if you modulate it with dc current getting delay in the ps timescale. Another question would be if it possible with the snap diode to make a power amp in some form of ringing oscillator. Of course, it should be modulable at least with FM. - Henry "RST Engineering" schrieb im Newsbeitrag ... A step-recovery ("snap") diode works on the principle of stored charge in the diode. During the forward biased half of the AC waveform, the diode is a very low impedance and it stores excess charge; during the reverse biased half of the waveform, the diode remains a low impedance until the stored charge is depleted, at which time the diode "snaps" into high impedance. This snap acts much like a spark-gap transmitter, in that a tremendous number of higher order harmonics are generated. In general (and there are ways to enhance this), the power available from any harmonic is around 1/n * Pin, where n is the order of the harmonic and Pin is the RF power input to the diode. Biasing the diode simply varies the point on the reverse cycle of the AC waveform where the diode snaps. For maximum power, you try to get the diode to snap at the peak of the waveform. However, by varying the diode bias, you can get it to snap before or after the peak of the waveform. Generally you can get it to snap plus or minus about 30 degrees about the peak before the snap action degrades. 60 degrees of phase shift is nothing to talk about unless you are working with the 10th harmonic, which means a phase shift of 600 degrees. Now you've got something to work with. Jim |
Unusual functions of cheap parts
On 30 Nov 2005 18:46:34 -0800, Winfield Hill
wrote: Winfried Salomon wrote... Jorgen Lund-Nielsen wrote: Winfried Salomon wrote: btw, do you know a standard complementary pnp-transistor for the 2N2369, such like 2N3905 but with higher ft and less feedback capacitance? It seems that the manufactorers have almost no data on their internet pages. Maybe 2N4261? Have not looked into the datasheet, but as i remember, i have seen them sometimes in complementary with the 2N2369 That was a high-frequency part for the time, spec'd at 1200MHz... the problem is, that it is an rf-transistor and can't be driven at 30V/0.2A, I found a complementary in an old table KTT, the 2N2894A, but it also has max. 12V, so I find no other than the 2N3906. An old Raytheon datasheet says the 2N2894 was doped with platinum. [snip] Thanks for tracking that down, Win! Gold in a PNP was certainly troubling my ancient remembrance of semiconductor chemistry. ...Jim Thompson -- | James E.Thompson, P.E. | mens | | Analog Innovations, Inc. | et | | Analog/Mixed-Signal ASIC's and Discrete Systems | manus | | Phoenix, Arizona Voice:(480)460-2350 | | | E-mail Address at Website Fax:(480)460-2142 | Brass Rat | | http://www.analog-innovations.com | 1962 | I love to cook with wine. Sometimes I even put it in the food. |
Unusual functions of cheap parts
On Sun, 18 Dec 2005 21:33:52 +0100, Rolf_B
wrote: John Larkin wrote: A 1N4007 can also be used as a drift step-recovery diode and as a plasma avalanche diode. Together, two can generate a kilovolt edge with a 100 ps risetime. Very interesting. The 1N4007 seem to be very versatile devices. They are available with a SOD-57 glass envelope, too (1N4007G?). These are fairly well photoconductive. When illuminated by a high efficiency IR LED (HSDL-4230 or so) current transfer ratios of 0.001 can be achieved. Not too much, but with two LEDs 100uA of photocurrent is obtainable. This is OK for a pass element in an "electrostatic" power supply for e.g. electron or ion lens systems. A high-voltage optocoupler; cool. I've posted a schematic for a hv opamp (400 v p-p) that uses two optoisolators as the output push-pull stage... it's very cheap and simple. A higher-voltage photodetector, like a glass power diode, sounds useful, too. I worked once with a company in Southern California that had a neat gadget: it was a truncated cone of silicon with gold contacts on the base and the flattened apex. It would stand off something like 5KV until you whacked it from above with a laser, illuminating all the sides of the cone, whence it would conduct hard. I think they went out of business, though; it was pretty obscure. John |
Unusual functions of cheap parts
Rolf_B wrote...
Very interesting. The 1N4007 seem to be very versatile devices. They are available with a SOD-57 glass envelope, too (1N4007G?). These are fairly well photoconductive. When illuminated ... While many companies* are making 1n4007G glass-passivated diodes, it appears they all cover the glass with plastic. I wonder... where one can get a 1n4007 with an all-glass package these days? * Including unusual semiconductor manufacturers, like: Won-Top, Bytesonic, Leshan Radio, Formosa Microsemi, Gulf Semiconductor, Dachang Electronic, Goodwork Semiconductor, etc. -- Thanks, - Win |
Unusual functions of cheap parts
In sci.electronics.components Winfield Hill wrote:
Rolf_B wrote... [1N4007] are available with a SOD-57 glass envelope, too (1N4007G?). These are fairly well photoconductive. While many companies* are making 1n4007G glass-passivated diodes, it appears they all cover the glass with plastic. I wonder... where one can get a 1n4007 with an all-glass package these days? I've got a few 1N4003 and 1N4004 diodes with all-glass packages but I'm not sure how recent they are. They have the (older?) Fairchild logo of an italicized "F" with the middle stroke extending on both sides of the vertical. I'm about 90% sure these came in one of those "20 rectifiers for $2" packages from Rat Shock, so who knows how old they really are. The bodies are about 2.5 mm diameter by 4 mm long. Inside the glass, the ends near the leads are orange, with a clear strip less than 0.5 mm wide near the middle. Testing them with the "diode check" on a $40 multimeter and either a 40 watt clear globe lamp or a TV remote control doesn't show much photoconductivity, but I suspect I would need to look a little harder than this to see it. Matt Roberds |
Unusual functions of cheap parts
On 18 Dec 2005 19:38:19 -0800, Winfield Hill
wrote: Rolf_B wrote... Very interesting. The 1N4007 seem to be very versatile devices. They are available with a SOD-57 glass envelope, too (1N4007G?). These are fairly well photoconductive. When illuminated ... While many companies* are making 1n4007G glass-passivated diodes, it appears they all cover the glass with plastic. I wonder... where one can get a 1n4007 with an all-glass package these days? * Including unusual semiconductor manufacturers, like: Won-Top, Bytesonic, Leshan Radio, Formosa Microsemi, Gulf Semiconductor, Dachang Electronic, Goodwork Semiconductor, etc. Or use a differnt diode in a glass case. The PN junction makes a decent small area photovoltaic cell (transistors too). FYI: if your using 1n4007 for a varactor, light impinging on glass versions will drive you nuts ( Florescents will give AC hum modulation) and lower the Q. Allison |
Unusual functions of cheap parts
Winfield Hill wrote:
Rolf_B wrote... Very interesting. The 1N4007 seem to be very versatile devices. They are available with a SOD-57 glass envelope, too (1N4007G?). These are fairly well photoconductive. When illuminated ... While many companies* are making 1n4007G glass-passivated diodes, it appears they all cover the glass with plastic. I wonder... where one can get a 1n4007 with an all-glass package these days? * Including unusual semiconductor manufacturers, like: Won-Top, Bytesonic, Leshan Radio, Formosa Microsemi, Gulf Semiconductor, Dachang Electronic, Goodwork Semiconductor, etc. -- Thanks, - Win How many do you need, and can you use ones pulled from PC boards? I may have some left that I pulled from damaged boards. -- Been there, Done that, I've got my DD214 to prove it. Michael A. Terrell Central Florida |
Unusual functions of cheap parts
|
Unusual functions of cheap parts
I thought optical triggered GTOs were still in business??
regards - Henry "John Larkin" schrieb im Newsbeitrag ... On Sun, 18 Dec 2005 21:33:52 +0100, Rolf_B wrote: John Larkin wrote: A 1N4007 can also be used as a drift step-recovery diode and as a plasma avalanche diode. Together, two can generate a kilovolt edge with a 100 ps risetime. Very interesting. The 1N4007 seem to be very versatile devices. They are available with a SOD-57 glass envelope, too (1N4007G?). These are fairly well photoconductive. When illuminated by a high efficiency IR LED (HSDL-4230 or so) current transfer ratios of 0.001 can be achieved. Not too much, but with two LEDs 100uA of photocurrent is obtainable. This is OK for a pass element in an "electrostatic" power supply for e.g. electron or ion lens systems. A high-voltage optocoupler; cool. I've posted a schematic for a hv opamp (400 v p-p) that uses two optoisolators as the output push-pull stage... it's very cheap and simple. A higher-voltage photodetector, like a glass power diode, sounds useful, too. I worked once with a company in Southern California that had a neat gadget: it was a truncated cone of silicon with gold contacts on the base and the flattened apex. It would stand off something like 5KV until you whacked it from above with a laser, illuminating all the sides of the cone, whence it would conduct hard. I think they went out of business, though; it was pretty obscure. John |
Unusual functions of cheap parts
On Wed, 21 Dec 2005 00:31:35 +0100, "Henry Kiefer"
wrote: I thought optical triggered GTOs were still in business?? regards - Henry Maybe so, but this wasn't a GTO, it was a bulk-effect device, blindingly fast. Can an opto-triggered GTO be turned *off* with light? John |
Unusual functions of cheap parts
Michael A. Terrell wrote...
How many do you need, and can you use ones pulled from PC boards? I may have some left that I pulled from damaged boards. One or two may be enough for proof-of-principle measurements. -- Thanks, - Win |
Unusual functions of cheap parts
Hello Henry,
Do you know of other interesting devices or circuits good for misuse? Six sawed off pieces of the pole of a busted market umbrella allowed me to move a 1/2ton piece of furniture all by myself. Oh wait, wrong category.... Regards, Joerg http://www.analogconsultants.com |
Unusual functions of cheap parts
Winfield Hill wrote:
Michael A. Terrell wrote... How many do you need, and can you use ones pulled from PC boards? I may have some left that I pulled from damaged boards. One or two may be enough for proof-of-principle measurements. -- Thanks, - Win I'll see if I can find a couple for you. -- Been there, Done that, I've got my DD214 to prove it. Michael A. Terrell Central Florida |
Unusual functions of cheap parts
On Wed, 21 Dec 2005 01:42:16 GMT, Joerg
wrote: Hello Henry, Do you know of other interesting devices or circuits good for misuse? Six sawed off pieces of the pole of a busted market umbrella allowed me to move a 1/2ton piece of furniture all by myself. Oh wait, wrong category.... Regards, Joerg http://www.analogconsultants.com I've done that with 1" oak dowel. ...Jim Thompson -- | James E.Thompson, P.E. | mens | | Analog Innovations, Inc. | et | | Analog/Mixed-Signal ASIC's and Discrete Systems | manus | | Phoenix, Arizona Voice:(480)460-2350 | | | E-mail Address at Website Fax:(480)460-2142 | Brass Rat | | http://www.analog-innovations.com | 1962 | "Winners never quit, quitters never win", Jack Bradley Budnik ~1956 |
Unusual functions of cheap parts
Hello Jim,
I've done that with 1" oak dowel. But if you bought those I bet my solution was cheaper. About one cent worth of elctricity to saw it ;-) Regards, Joerg http://www.analogconsultants.com |
Unusual functions of cheap parts
On Wed, 21 Dec 2005 01:57:43 GMT, Joerg
wrote: Hello Jim, I've done that with 1" oak dowel. But if you bought those I bet my solution was cheaper. About one cent worth of elctricity to saw it ;-) Regards, Joerg http://www.analogconsultants.com I don't know, I save all my scrap ;-) ...Jim Thompson -- | James E.Thompson, P.E. | mens | | Analog Innovations, Inc. | et | | Analog/Mixed-Signal ASIC's and Discrete Systems | manus | | Phoenix, Arizona Voice:(480)460-2350 | | | E-mail Address at Website Fax:(480)460-2142 | Brass Rat | | http://www.analog-innovations.com | 1962 | "Winners never quit, quitters never win", Jack Bradley Budnik ~1956 |
Unusual functions of cheap parts
Jim Thompson wrote:
On Wed, 21 Dec 2005 01:42:16 GMT, Joerg wrote: Hello Henry, Do you know of other interesting devices or circuits good for misuse? Six sawed off pieces of the pole of a busted market umbrella allowed me to move a 1/2ton piece of furniture all by myself. Oh wait, wrong category.... I've done that with 1" oak dowel. I've done it with sheer adrenaline (I'm 6'0", 150#) after watching three big bruisers horse around and get nowhere with an air conditioner that was IN MY ****ING WAY!!! I stomped up, said "MOVE IT!", grabbed a corner, shoved hard and walked past. And no, I didn't so much as bend a fingernail. Mark L. Fergerson PS I once used a $150 multimeter as a non-resettable fuse, but I don't think that's what the OP had in mind... |
Unusual functions of cheap parts
Mark Fergerson wrote:
Jim Thompson wrote: On Wed, 21 Dec 2005 01:42:16 GMT, Joerg wrote: Hello Henry, Do you know of other interesting devices or circuits good for misuse? Six sawed off pieces of the pole of a busted market umbrella allowed me to move a 1/2ton piece of furniture all by myself. Oh wait, wrong category.... I've done that with 1" oak dowel. I've done it with sheer adrenaline (I'm 6'0", 150#) after watching three big bruisers horse around and get nowhere with an air conditioner that was IN MY ****ING WAY!!! I stomped up, said "MOVE IT!", grabbed a corner, shoved hard and walked past. And no, I didn't so much as bend a fingernail. Mark L. Fergerson PS I once used a $150 multimeter as a non-resettable fuse, but I don't think that's what the OP had in mind... I got mad one day when i was 20 and picked up a Pontiac 389 short block. -- Been there, Done that, I've got my DD214 to prove it. Michael A. Terrell Central Florida |
Unusual functions of cheap parts
On Wed, 21 Dec 2005 07:54:30 -0700, Mark Fergerson wrote:
Jim Thompson wrote: On Wed, 21 Dec 2005 01:42:16 GMT, Joerg wrote: Hello Henry, Do you know of other interesting devices or circuits good for misuse? Six sawed off pieces of the pole of a busted market umbrella allowed me to move a 1/2ton piece of furniture all by myself. Oh wait, wrong category.... I've done that with 1" oak dowel. I've done it with sheer adrenaline (I'm 6'0", 150#) after watching three big bruisers horse around and get nowhere with an air conditioner that was IN MY ****ING WAY!!! I stomped up, said "MOVE IT!", grabbed a corner, shoved hard and walked past. And no, I didn't so much as bend a fingernail. For some reason, this brings to mind one of todays Top Nooz stories - some woman who was jogging in the park was jumped by some guy who wanted to assault her and she kicked the **** out of him. But they noted that she was 6' and about 140#, and he was 5'6", 120#. It was actually kinda refreshing to hear about someone defending herself, but how stoopid do you have to be to attack somebody that's twice your size? ?:-/ Cheers! Rich |
Unusual functions of cheap parts
Back when one of my tasks at Fluke was to interview college recruits, I was
asked to describe my job as an Analog Design Engineer. My answer: "To design precision instruments using cheap, junk parts." A tip of the hat to Norm Strong... Steve. -- Steven D. Swift, , http://www.novatech-instr.com NOVATECH INSTRUMENTS, INC. P.O. Box 55997 206.301.8986, fax 206.363.4367 Seattle, Washington 98155 USA |
Unusual functions of cheap parts
Michael A. Terrell wrote...
Winfield Hill wrote: Michael A. Terrell wrote... How many do you need, and can you use ones pulled from PC boards? I may have some left that I pulled from damaged boards. One or two may be enough for proof-of-principle measurements. I'll see if I can find a couple for you. OK, I'll trade you some 1500V damper diodes, with datasheets. They should be interesting additions to your parts inventory. -- Thanks, - Win |
Unusual functions of cheap parts
wrote:
Do you know of other interesting devices or circuits good for misuse? Old thread, but still worth answering. * Small signal germanium transistors in glass packaging, (OC45 comes to memory, TO1 package,) make good photodetectors after scrapping the paint. * Zener diodes are good noise generators (This is widely known and used.) * Some small (toy) dc motors wired in series with a speaker make good siren sounds. Roberto Waltman [ Please reply to the group, ] [ return address is invalid. ] |
Unusual functions of cheap parts
Winfield Hill wrote:
Michael A. Terrell wrote... Winfield Hill wrote: Michael A. Terrell wrote... How many do you need, and can you use ones pulled from PC boards? I may have some left that I pulled from damaged boards. One or two may be enough for proof-of-principle measurements. I'll see if I can find a couple for you. OK, I'll trade you some 1500V damper diodes, with datasheets. They should be interesting additions to your parts inventory. -- Thanks, - Win Win, I did a lot of digging and the best I can find is five glass 1N4004s. I have either used up all of the glass 1N4007s, or didn't but them back into the right place the last time I used some of them. Are they high enough voltage to test your circuit? If they are, E-mail me with a shipping address, and I'll send them to you. I appreciate the offer of the parts, but I am to the point that I don't feel well enough to do anything at my workbench. It has been about 18 months since I felt like trying to do anything, and most of my test equipment was water damaged in the 2004 hurricanes. Its just too depressing to try to work with what little is left. -- Service to my country? Been there, Done that, and I've got my DD214 to prove it. Member of DAV #85. Michael A. Terrell Central Florida |
Unusual functions of cheap parts
Michael A. Terrell wrote:
I appreciate the offer of the parts, but I am to the point that I don't feel well enough to do anything at my workbench. It has been about 18 months since I felt like trying to do anything, and most of my test equipment was water damaged in the 2004 hurricanes. Its just too depressing to try to work with what little is left. That sucks. Sorry it happened to you. -- If John McCain gets the 2008 Republican Presidential nomination, my vote for President will be a write-in for Jiang Zemin. |
Unusual functions of cheap parts
clifto wrote...
Michael A. Terrell wrote: I appreciate the offer of the parts, but I am to the point that I don't feel well enough to do anything at my workbench. It has been about 18 months since I felt like trying to do anything, and most of my test equipment was water damaged in the 2004 hurricanes. Its just too depressing to try to work with what little is left. That sucks. Sorry it happened to you. Yeah. I have some extra instruments not doing anything, if you feel well enough not to use that as an excuse. I get stuff real cheap on eBay, and sometimes Harvard types are too proud to use it. And they also give me stuff nobody wants. A perfectly-fine HP oscilloscope, for example. Before anybody makes a remark, yes I've used HP scopes, used them in EE lab years ago, and have a 500MHz 4-channel Infinium plus an Agilent's 300MHz MSO on my bench now, so hide that smirk. :-) -- Thanks, - Win |
Unusual functions of cheap parts
Winfield Hill wrote:
Yeah. I have some extra instruments not doing anything, if you feel well enough not to use that as an excuse. I get stuff real cheap on eBay, and sometimes Harvard types are too proud to use it. And they also give me stuff nobody wants. A perfectly-fine HP oscilloscope, for example. Before anybody makes a remark, yes I've used HP scopes, used them in EE lab years ago, and have a 500MHz 4-channel Infinium plus an Agilent's 300MHz MSO on my bench now, so hide that smirk. :-) People are funny. I had a 2 MHz scope once, did lots with it. You can use scopes well above their f_max with a simple envelope detector. NT |
Unusual functions of cheap parts
In article .com,
wrote: [....] People are funny. I had a 2 MHz scope once, did lots with it. You can use scopes well above their f_max with a simple envelope detector. I had one with about a 30KHz bandwidth. The nice thing about it was that you could switch to driving the plates externally. It got lost in a flood : -- -- forging knowledge |
Unusual functions of cheap parts
On Sun, 22 Jan 2006 13:57:58 +0000, Michael A. Terrell wrote:
Winfield Hill wrote: Michael A. Terrell wrote... Winfield Hill wrote: Michael A. Terrell wrote... How many do you need, and can you use ones pulled from PC boards? I may have some left that I pulled from damaged boards. One or two may be enough for proof-of-principle measurements. I'll see if I can find a couple for you. OK, I'll trade you some 1500V damper diodes, with datasheets. They should be interesting additions to your parts inventory. Win, I did a lot of digging and the best I can find is five glass 1N4004s. As reluctant as I am to contradict a fart who's even older than me, if it's glass, it isn't a 1N4004: http://www.datasheetcatalog.com/data...0/1N4004.shtml Cheers! Rich |
Unusual functions of cheap parts
On Sun, 22 Jan 2006 15:14:11 -0800, Winfield Hill wrote:
clifto wrote... Michael A. Terrell wrote: I appreciate the offer of the parts, but I am to the point that I don't feel well enough to do anything at my workbench. It has been about 18 months since I felt like trying to do anything, and most of my test equipment was water damaged in the 2004 hurricanes. Its just too depressing to try to work with what little is left. That sucks. Sorry it happened to you. Yeah. I have some extra instruments not doing anything, if you feel well enough not to use that as an excuse. I get stuff real cheap on eBay, and sometimes Harvard types are too proud to use it. And they also give me stuff nobody wants. A perfectly-fine HP oscilloscope, for example. Before anybody makes a remark, yes I've used HP scopes, used them in EE lab years ago, and have a 500MHz 4-channel Infinium plus an Agilent's 300MHz MSO on my bench now, so hide that smirk. :-) Well, I've been known to disdain HP scopes because their sync sucks, and their knobs have terrible backlash, but at that price, hey, beggars can't be choosers! You already have my snail mail address - third or fourth class can't be that expensive - I've gone some years without a scope - a couple more weeks certainly isn't going to do me any harm! hint, hint Thanks! Rich |
Unusual functions of cheap parts
Winfield Hill wrote:
Before anybody makes a remark, yes I've used HP scopes, used them in EE lab years ago, and have a 500MHz 4-channel Infinium plus an Agilent's 300MHz MSO on my bench now, so hide that smirk. :-) I've used H-P scopes, too. They're perfectly fine scopes if you don't need triggered sweep[1]. Some of them even play games. [1] even those old Telequipment units would trigger on *some* waveforms. -- If John McCain gets the 2008 Republican Presidential nomination, my vote for President will be a write-in for Jiang Zemin. |
Unusual functions of cheap parts
Rich Grise wrote:
On Sun, 22 Jan 2006 13:57:58 +0000, Michael A. Terrell wrote: Winfield Hill wrote: Michael A. Terrell wrote... Winfield Hill wrote: Michael A. Terrell wrote... How many do you need, and can you use ones pulled from PC boards? I may have some left that I pulled from damaged boards. One or two may be enough for proof-of-principle measurements. I'll see if I can find a couple for you. OK, I'll trade you some 1500V damper diodes, with datasheets. They should be interesting additions to your parts inventory. Win, I did a lot of digging and the best I can find is five glass 1N4004s. As reluctant as I am to contradict a fart who's even older than me, if it's glass, it isn't a 1N4004: http://www.datasheetcatalog.com/data...0/1N4004.shtml Cheers! Rich So, you think that a single datasheet covers all manufacturers, and all production runs? Once again, you show a great lack of understanding. I have several glass 1N4004 diodes in front of me. -- Service to my country? Been there, Done that, and I've got my DD214 to prove it. Member of DAV #85. Michael A. Terrell Central Florida |
Unusual functions of cheap parts
"Michael A. Terrell" wrote in message ... So, you think that a single datasheet covers all manufacturers, and all production runs? Once again, you show a great lack of understanding. I have several glass 1N4004 diodes in front of me. 400 PIV? |
Unusual functions of cheap parts
Rich Grise wrote...
As reluctant as I am to contradict a fart who's even older than me, if it's glass, it isn't a 1N4004: http://www.datasheetcatalog.com/data...0/1N4004.shtml You're probably wrong, of course, as Michael Terrell points out, but I'll have to admit that's an impressive list, and I love the manufacturer's logos, 26 of them, all lined up. Sigh, I only have datasheets from 20, stored in my computer. But, I have them from Won-Top, Leshan Radio, Gulf Semi, Formosa Micro, Dachang, and Bytesonic, to name a few they don't have, SFAICS. Plus, I have multiple versions from several of the companies. So there! So many files, so little time. -- Thanks, - Win |
| All times are GMT +1. The time now is 05:27 AM. |
Powered by vBulletin® Copyright ©2000 - 2025, Jelsoft Enterprises Ltd.
RadioBanter.com