hi, i have this linear amplifier project http://tzitzikas.webs.com/irf640-1.JPG with 2 irf640 mosfets.
My problem is, when i adjust the both mosfets drain's current at 400mA (current without input signal), after some minutes
when the heatshink is warm (with input signal), the current becomes...
Hello, i have done this project. It is an experimental oscillator - modulator for mw frequencies. The schematics are here:
oscillator:
http://tzitzikas.webs.com/oscillator-1.JPG
modulator:
The problem is that the designer told me to use an 1kohm variable series resistance between oscillator...