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Total 7 documents matching your query.

1. Re: [Amps] switchable zener cathode bias (score: 1): Author: Karl-Arne Markström <sm0aom@telia.com>; Date: Wed, 31 Dec 2008 10:33:13 +0100; The easiest way would be to use a single-pole relay or switch contact to parallel the lower-voltage Zener with the higher-voltage one. When in circuit, the lower-voltage Zener will go into conduction; /archives//html/Amps/2008-12/msg00385.html (9,596 bytes)
2. Re: [Amps] switchable zener cathode bias (score: 1): Author: Mel <itz_da_police@yahoo.com>; Date: Wed, 31 Dec 2008 14:58:09 -0800 (PST); Steve, I placed the two zener diodes in series and used a set of relay contacts to bypass one of the diodes to lower the zener voltage and make the tube run hotter (or cooler). 73 ko0m Consider; /archives//html/Amps/2008-12/msg00384.html (9,007 bytes)
3. Re: [Amps] switchable zener cathode bias (score: 1): Author: Radio WC6W <wc6w_amps@yahoo.com>; Date: Wed, 31 Dec 2008 10:43:58 -0800 (PST); Hi Steve, Leave the high voltage one in circuit continuously and just switch in the lower voltage part in parallel with it when you need less bias. 73 & Happy New Year! Marv WC6W http://wc6w.50webs.c; /archives//html/Amps/2008-12/msg00383.html (9,165 bytes)
4. Re: [Amps] switchable zener cathode bias (score: 1): Author: "alexeban" <alexeban@gmail.com>; Date: Wed, 31 Dec 2008 17:08:43 +0200; ...put the 2 in series! Choose the smaller one for whatever voltage you need and the second equal to the difference of the smaller voltage and the higher one. Then you can short out the second one wi; /archives//html/Amps/2008-12/msg00382.html (9,492 bytes)
5. Re: [Amps] switchable zener cathode bias (score: 1): Author: "pc5m, Carel" <pc5m@xs4all.nl>; Date: Wed, 31 Dec 2008 10:26:03 +0100; Hi Steve, I suppose you use a low power zener and 2n3055: If you just connect via a relay of single pole switch the lower valued zener in parallel with the higher voltage zener all would be fine. Gl,; /archives//html/Amps/2008-12/msg00380.html (9,120 bytes)
6. Re: [Amps] switchable zener cathode bias (score: 1): Author: TexasRF@aol.com; Date: Wed, 31 Dec 2008 03:53:00 EST; Steve, you can avoid the problem by wiring in the higher voltage zener permanently and using your switch to connect the lower voltage zener in parallel with the higher voltage zener. When both zeners; /archives//html/Amps/2008-12/msg00379.html (8,874 bytes)
7. [Amps] switchable zener cathode bias (score: 1): Author: "Steve Flood" <kk7uv@bresnan.net>; Date: Tue, 30 Dec 2008 09:53:14 -0700; Considering the common zener bias circuit (with the 2n3055 and resistor), what precautions should be taken if I wanted two different zeners (and associated bias voltages) selected by a switch or rela; /archives//html/Amps/2008-12/msg00377.html (7,353 bytes)

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