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[Amps] Bias Zener Diodes In Parallel ?

To: <amps@contesting.com>
Subject: [Amps] Bias Zener Diodes In Parallel ?
From: Ian White, G3SEK" <g3sek@ifwtech.co.uk (Ian White, G3SEK)
Date: Fri, 19 Jul 2002 20:13:13 +0100
2 Wrote:

>>
>>Paul and I favor the TL431-TIP147 bias circuit because we supply our
>>different control boards for a large range of tubes, so we need a 'one
>>circuit fits all' solution. Maybe that makes us biased?
>>
>I am biased toward simple, minimal-cost, glitch-resistant circuits that
>work.   The [Figure 7] optoisolator/10A, Si-npn switch/3A diode-string
>will reliably handle a 3cx3000A7 and it switches in under 7uS.
>
>>However, if you're also going to use EBS, the TL431-TIP147 circuit has
>>everything you need - the power transistor and the switching facility
>>too. To bias off the tube, simply switch the control gate of the TL431
>>to its anode (collector of TIP147). Switching time is a few
>>microseconds.

Both circuits can make equally valid claims of simplicity, low cost and 
glitch resistance. They just get there in different ways.

-- 
73 from Ian G3SEK
www.ifwtech.co.uk/g3sek

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