If you use a PNP transistor in the bias circuit, the collector can be
bolted to the chassis for excellent heat sinking. Of coarse the rest of the
circuit has to be designed for that configuration.
I use this arrangement in a 1296MHz TH347 tetrode amp and it works very
well.
73,
Gerald K5GW
In a message dated 3/8/2010 2:47:50 P.M. Central Standard Time,
patriot121@msn.com writes:
Sorry .. its for bias of a GS-35B ... the emitter of the NPN is sunk
(grounded) during Tx ... i guess i would need to copy/paste a section of my
amps
schematic to help describe this problem/query.
Mike
KC7NOA
> Date: Mon, 8 Mar 2010 15:44:10 -0500
> From: ka4inm@tampabay.rr.com
> To: patriot121@msn.com
> Subject: Re: [Amps] GS35b Bias
>
> Hi MIKE DURKIN:
>
> > Has any one used a LM (like a LM317t .. I have a bunch of them)
regulator with a NPN pass transistor , rather than use a tl431 and a PNP pass
transistor ... ??
>
> I don't understand the question, but I have used everything every which
way, what
> application/s are you thinking about.
> --
> Ron KA4INM - I'm proud to be Chuck's pop!
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