Try the stand alone bias board by W4ZT, it`s small,fully adjustable,and can
be found at www.w4zt.com. I use one in my modified DTR-2000L (8877)...Works
fb!..Jim K7RDX..
----- Original Message -----
From: "Steve Thompson" <g8gsq@eltac.co.uk>
To: <amps@contesting.com>
Sent: Friday, September 07, 2007 11:45 PM
Subject: Re: [Amps] Zener diode for TL922
> Bryan Swadener wrote:
> > Aron 4X1FQ wrote:
> >
> >> HI,
> >> Looking for 7,5 v zener 10w diode for TL922.
> >> wonder where i can buy them.
> >> Thanks,
> >> Aron 4X1FQ.
> >
> > Hi Aron,
> > Mouser (http://www.mouser.com/) shows them in stock in
> > two forms -- "normal" and "reverse polarity" (1N2971B
> > and 1N2971BR). However, while you'll pay
> > approximately $5 USD for the part, you'll pay a
> > minimum of $38 USD for shipping. If you can't find a
> > 1N2971 in your country, you may want to just use a
> > stack of silicon rectifiers instead. The advantage is
> > that you will be able to select the number of
> > rectifiers to set the zero signal plate current to
> > your liking. Another technique for adjustable bias is
> > shown here: http://bias.gs35b.com/ -- I used it in my
> > Heathkit SB-220.
> You could also look at information about the triode control board
> designed by G3SEK - http://www.ifwtech.co.uk/g3sek/ and also see
> the addendum at the end of http://www.landfall.net/Radio/8877-1.htm
> for other alternatives to a high power zener.
>
> Steve
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