Home |
Search |
Today's Posts |
#51
|
|||
|
|||
On Mon, 20 Oct 2003 16:43:06 +0100, "Frank Dinger"
wrote: Talking about nails ,some time ago in the dutch amateur radio mag. 'Electron' , there was an article describing a kid's radio. ,dubbed 'Nail Radio' . Its construction was on a piece of timber into which copperclad nails had been hammered in circuit diagramme configuration . The components (for this medium wave receiver) were subsequently soldered to the nail heads. A superb way to introduce newcomers to electronics and radio home-brewing. A real circuit "board". Any technique that works, is good technique. Happy trails, Gary (net.yogi.bear) ------------------------------------------------ at the 51st percentile of ursine intelligence Gary D. Schwartz, Needham, MA, USA Please reply to: garyDOTschwartzATpoboxDOTcom |
#52
|
|||
|
|||
In article , "David Forsyth"
writes: On a second side note - does anyone happen to know what the formula would be to calculate the capacitance between two metal plates of a given area and given spacing, having an air dielectric? From the good ol' "Green Bible" (ITT Reference Data for Radio Engineers, 4th Edition, 1956, page 133), for only two plates, dimensions in inches, air dielectric: Capacitance (pFd) = 0.225 x Square Area / spacing Assuming the plates are the same size and shape. Len Anderson retired (from regular hours) electronic engineer person |
#53
|
|||
|
|||
In article , "David Forsyth"
writes: On a second side note - does anyone happen to know what the formula would be to calculate the capacitance between two metal plates of a given area and given spacing, having an air dielectric? From the good ol' "Green Bible" (ITT Reference Data for Radio Engineers, 4th Edition, 1956, page 133), for only two plates, dimensions in inches, air dielectric: Capacitance (pFd) = 0.225 x Square Area / spacing Assuming the plates are the same size and shape. Len Anderson retired (from regular hours) electronic engineer person |
#54
|
|||
|
|||
Thanks Len!
Dave "Avery Fineman" wrote in message ... In article , "David Forsyth" writes: On a second side note - does anyone happen to know what the formula would be to calculate the capacitance between two metal plates of a given area and given spacing, having an air dielectric? From the good ol' "Green Bible" (ITT Reference Data for Radio Engineers, 4th Edition, 1956, page 133), for only two plates, dimensions in inches, air dielectric: Capacitance (pFd) = 0.225 x Square Area / spacing Assuming the plates are the same size and shape. Len Anderson retired (from regular hours) electronic engineer person |
#55
|
|||
|
|||
Thanks Len!
Dave "Avery Fineman" wrote in message ... In article , "David Forsyth" writes: On a second side note - does anyone happen to know what the formula would be to calculate the capacitance between two metal plates of a given area and given spacing, having an air dielectric? From the good ol' "Green Bible" (ITT Reference Data for Radio Engineers, 4th Edition, 1956, page 133), for only two plates, dimensions in inches, air dielectric: Capacitance (pFd) = 0.225 x Square Area / spacing Assuming the plates are the same size and shape. Len Anderson retired (from regular hours) electronic engineer person |
#56
|
|||
|
|||
David Forsyth wrote:
The "dead bug" way? I'm not sure what this means - please forgive me I'm new to this :-) Dave "Bill Hennessy" wrote in message . .. Yes, I have found when building regenerative receivers wood is the best chassi. However a metal front panel is a must. However I only use battery tubes with low voltage. Never more than 45 volts. But when building solid-state regeneratives. A good ground plane helps. Build it the dead bug way. 'Dead bug' refers to IC's mounted upside down with their legs sticking up in the air like a dead roach. |
#57
|
|||
|
|||
David Forsyth wrote:
The "dead bug" way? I'm not sure what this means - please forgive me I'm new to this :-) Dave "Bill Hennessy" wrote in message . .. Yes, I have found when building regenerative receivers wood is the best chassi. However a metal front panel is a must. However I only use battery tubes with low voltage. Never more than 45 volts. But when building solid-state regeneratives. A good ground plane helps. Build it the dead bug way. 'Dead bug' refers to IC's mounted upside down with their legs sticking up in the air like a dead roach. |
#58
|
|||
|
|||
Michael A. Terrell wrote:
Michael Black wrote: "Ralph Mowery" ) writes: Aluminum is usually easier for most to work with with simple hand tools. Steel is fine but it might rust and look bad after a while. Make the chassie out of whatever kind of metel that you think is the best for you to work with . Electrically there will be little if any differance. And of course, everyone did use steel (once things progressed beyond wood and bakelite chassis) right up until aluminum because readily available and/or cheap enough, at which point I doubt anyone used steel except if what they were building was really really heavy, ie a kilowatt modulator or final. Michael VE2BVW I have seen a few nice layouts on Brass chassis, as well. Easier to work than steel, and you can still solder to it. I built some tube RF decks on 1/16" brass sheet stock, and mounted them into a steel cabinet years ago. I think RL Drake used copper chassis on their tube ham gear. Looked real nice when new and shiny! I've build some equipment in home made boxes made out of copper (you can get small pieces of sheet copper from the hobby shop). Not cheap, but solders easy and makes a great ground plane! |
#59
|
|||
|
|||
Michael A. Terrell wrote:
Michael Black wrote: "Ralph Mowery" ) writes: Aluminum is usually easier for most to work with with simple hand tools. Steel is fine but it might rust and look bad after a while. Make the chassie out of whatever kind of metel that you think is the best for you to work with . Electrically there will be little if any differance. And of course, everyone did use steel (once things progressed beyond wood and bakelite chassis) right up until aluminum because readily available and/or cheap enough, at which point I doubt anyone used steel except if what they were building was really really heavy, ie a kilowatt modulator or final. Michael VE2BVW I have seen a few nice layouts on Brass chassis, as well. Easier to work than steel, and you can still solder to it. I built some tube RF decks on 1/16" brass sheet stock, and mounted them into a steel cabinet years ago. I think RL Drake used copper chassis on their tube ham gear. Looked real nice when new and shiny! I've build some equipment in home made boxes made out of copper (you can get small pieces of sheet copper from the hobby shop). Not cheap, but solders easy and makes a great ground plane! |
#60
|
|||
|
|||
kenneth scharf wrote:
Michael A. Terrell wrote: Michael Black wrote: "Ralph Mowery" ) writes: Aluminum is usually easier for most to work with with simple hand tools. Steel is fine but it might rust and look bad after a while. Make the chassie out of whatever kind of metel that you think is the best for you to work with . Electrically there will be little if any differance. And of course, everyone did use steel (once things progressed beyond wood and bakelite chassis) right up until aluminum because readily available and/or cheap enough, at which point I doubt anyone used steel except if what they were building was really really heavy, ie a kilowatt modulator or final. Michael VE2BVW I have seen a few nice layouts on Brass chassis, as well. Easier to work than steel, and you can still solder to it. I built some tube RF decks on 1/16" brass sheet stock, and mounted them into a steel cabinet years ago. I think RL Drake used copper chassis on their tube ham gear. Looked real nice when new and shiny! I've build some equipment in home made boxes made out of copper (you can get small pieces of sheet copper from the hobby shop). Not cheap, but solders easy and makes a great ground plane! Yes, I know what you mean. I still have some pieces of sheet brass, angles, and small tubes for RF work. I use to solder small brass boxes together for shields when I built filters and RF pre amps. I was using K&S Engineering materials sold at hobby shops, but the last hobby shop in Ocala closed about four years ago. I am looking for a place to get some deep drawn brass boxes and small tubing to build some DC blocks, detectors, and dummy antennas to sell as alignment aids for older radios. -- Michael A. Terrell Central Florida |
Reply |
Thread Tools | Search this Thread |
Display Modes | |
|
|
Similar Threads | ||||
Thread | Forum | |||
Rare Books on Electronics and Radio and Commmunications | Equipment | |||
Rare Books on Electronics and Radio and Commmunications | Equipment |