Looking at your triode board on the below link, looks like there is no
filament delay incorporated into your board. Am I missing something here ?
If not, why is there no filament delay incorporated onto the board ?
Thanks and 73
Jim W7RY
----- Original Message -----
From: Ian White, G3SEK <G3SEK@ifwtech.com>
To: <amps@contesting.com>
Sent: Sunday, June 18, 2000 15:23
Subject: Re: [AMPS] 3cx1000a7 bias
>
> Rich Measures wrote:
> >Zeners are not adjustable. They usually don't survive a glitch. A
> >string of foreward biased diodes is Way cheaper than a zener and they are
> >adjustable in 0.7v steps.
>
> This question keeps coming around, and whenever Rich mentions the string
> of diodes, it's also the cue for me...
>
> There's a circuit on my site that is continuously adjustable and gives
> true constant-voltage regulation. This circuit uses the TL431
> "adjustable zener" and a PNP Darlington boost transistor.
>
> http://www.ifwtech.com/g3sek/boards/triode/triode-3.htm#4CathodeBias
>
> Can't beat Rich's string of diodes for low cost, but the TL431 circuit
> might still be cheaper than a very large zener.
>
> 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
>
>
--
FAQ on WWW: http://www.contesting.com/FAQ/amps
Submissions: amps@contesting.com
Administrative requests: amps-REQUEST@contesting.com
Problems: owner-amps@contesting.com
|