Re: Variable gain preamp anyone?


Tom Crosbie G6PZZ
 

Thanks for your input Simon.
Can you share your LM317 circuit please? My kit was based on a so-called reference design but it had stability problems. I'm wondering if it was wrong components or my soldering or both.
Tom G6PZZ

-----Original Message-----
From: CrossCountryWireless@groups.io <CrossCountryWireless@groups.io> On Behalf Of Simon
Sent: 26 September 2020 15:40
To: CrossCountryWireless@groups.io
Subject: Re: [CrossCountryWireless] Variable gain preamp anyone?

I have tried this before..12-4v via lm317.

From 12-( circa) 5.5v no real difference in gain, prehaps imd.

From 5.5-circa 4v it does make alot of difference. Switching off circa 4v at t.

This was with the loop amp sold by ccw about 5 months ago..

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