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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