To: | <amps@contesting.com> |
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Subject: | [AMPS] Blown TL922A... What to do? |
From: | Ian White, G3SEK" <g3sek@ifwtech.com (Ian White, G3SEK) |
Date: | Mon, 11 Sep 2000 17:25:33 +0100 |
measures wrote: > >> >>measures wrote: >>>The grid protection circuits I am talking about are those that provide no >>>protection because the transistor that interrupts has too low a current >>>rating and it shorts during a glitch -- thereby affording no protection. >>> >>Failure of that transistor to survive a glitch/arc/parastic/flash- >>over/whatever is a simple DC design fault that can be cured by a 10K >>resistor. >> >A 10k-ohm resistor can prevent C-E shorts due to excessive collector >current? > >>I don't think that's a good reason to remove grid current protection for >>normal operation. > >Replacing a shorted transistor with a fuse-R is hardly removing >protection. Shorted transistors afford no protection because they can >not turn off. We may be talking about different transistors. Let's start again. Where in the circuit is the transistor that you say burns out in a glitch? Why do you believe that it should be removed, if that also involves disabling grid current protection in normal operation? 73 from Ian G3SEK Editor, 'The VHF/UHF DX Book' 'In Practice' columnist for RadCom (RSGB) http://www.ifwtech.com/g3sek -- FAQ on WWW: http://www.contesting.com/FAQ/amps Submissions: amps@contesting.com Administrative requests: amps-REQUEST@contesting.com Problems: owner-amps@contesting.com |
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