Ongoingfet simply amp
STDfet simply amp
License
：Public Domain
Description
very simple cheap fets ampli and with good performance. i ll be glad to anyone will improve the circuit and makes one side pcb. thanks
set the bias as about 3,1 volts on gate of irfp240. turn r9 from minimum resistance , then turn until 3,1 volts on gate fets- you can use various devices in input differential stage like bc 239, 2sc1845, or fets like 2n 7000- for q3 you can use 2sb649 or others. the picture published is mounting two output fets only. r2 is input sensitivity. i tested it until +60 -60 volts.
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