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#1
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Tom Bruhns wrote:
In a real diode, the change in slope is gradual with no sharp corners, but if you could find a diode which looked like, say, 1000 ohms in the reverse direction for all voltages and 1000.1 ohms in the forward direction, it would still work as a detector, albeit a poor one. Son, that's called a Selenium rectifier. Goddam newbies. Rob |
#2
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Rob Judd wrote in message ...
Tom Bruhns wrote: In a real diode, the change in slope is gradual with no sharp corners, but if you could find a diode which looked like, say, 1000 ohms in the reverse direction for all voltages and 1000.1 ohms in the forward direction, it would still work as a detector, albeit a poor one. Son, that's called a Selenium rectifier. Goddam newbies. Now if you'd mentioned copper oxide, I might have been mildly impressed... ;-) Seems like there were some iron based ones, too. And then there's the coherer... Not all early detectors were insensitive, however. Have a look at the Marconi detector which uses a moving magnetic band. Seems like we had a thread here about it a few years ago, and there was a nice article about it in EW+WW. All the seleniums I ever used ('cept for the shorted ones) worked a whole lot better than 10001:10000! Cheers, Tom |
#3
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Tom Bruhns wrote:
All the seleniums I ever used ('cept for the shorted ones) worked a whole lot better than 10001:10000! All the seleniums I noticed (in TV service, that is) didn't... which leads us to that unforgettable smell from a failed one. Ghufph. -- The function of an asshole is to emit quantities of crap. Spammers do a very good job of that. However, I do object to my inbox being a spammer's toilet bowl. -- Walter Dnes |
#4
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Clifton T. Sharp Jr. wrote:
Tom Bruhns wrote: All the seleniums I ever used ('cept for the shorted ones) worked a whole lot better than 10001:10000! All the seleniums I noticed (in TV service, that is) didn't... which leads us to that unforgettable smell from a failed one. Ghufph. Ah yes, that "bad" Garlic smell, great trouble shooting aid. Bill Higdon |
#5
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Clifton T. Sharp Jr. wrote:
Tom Bruhns wrote: All the seleniums I ever used ('cept for the shorted ones) worked a whole lot better than 10001:10000! All the seleniums I noticed (in TV service, that is) didn't... which leads us to that unforgettable smell from a failed one. Ghufph. Ah yes, that "bad" Garlic smell, great trouble shooting aid. Bill Higdon |
#6
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Tom Bruhns wrote:
All the seleniums I ever used ('cept for the shorted ones) worked a whole lot better than 10001:10000! All the seleniums I noticed (in TV service, that is) didn't... which leads us to that unforgettable smell from a failed one. Ghufph. -- The function of an asshole is to emit quantities of crap. Spammers do a very good job of that. However, I do object to my inbox being a spammer's toilet bowl. -- Walter Dnes |
#7
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Rob Judd wrote in message ...
Tom Bruhns wrote: In a real diode, the change in slope is gradual with no sharp corners, but if you could find a diode which looked like, say, 1000 ohms in the reverse direction for all voltages and 1000.1 ohms in the forward direction, it would still work as a detector, albeit a poor one. Son, that's called a Selenium rectifier. Goddam newbies. Now if you'd mentioned copper oxide, I might have been mildly impressed... ;-) Seems like there were some iron based ones, too. And then there's the coherer... Not all early detectors were insensitive, however. Have a look at the Marconi detector which uses a moving magnetic band. Seems like we had a thread here about it a few years ago, and there was a nice article about it in EW+WW. All the seleniums I ever used ('cept for the shorted ones) worked a whole lot better than 10001:10000! Cheers, Tom |
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