Re: Variable gain preamp anyone?
Tom Crosbie G6PZZ
Thanks for your input Simon.toggle quoted messageShow quoted text
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.
From: CrossCountryWireless@groups.io <CrossCountryWireless@groups.io> On Behalf Of Simon
Sent: 26 September 2020 15:40
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..