I built up a FET version of the phase shift oscillator on the right of
I used a 1.5k source resistor bypassed by a 1000 uF cap. The drain load resistor is 3.9k, and the supply voltage is 9VDC. The 3 caps are 10 uF, and the three resistors to common are 150k each. The FET is a MPF102. The drain voltage is about half the supply voltage.
When I power it up, I get the damped sine wave, I can see it on the DVM. The voltage gain for a PSO has to be at least 29 to oscillate, so apparently I don't have enough V gain to make up for the losses in the network.
How do I get more V gain out of the single FET? The source is fully bypassed. Thanks.
-- @@F@r@o@m@@O@r@a@n@g@e@@C@o@u@n@t@y@,@@C@a@l@,@@w@h@e@r@e@@ ###Got a Question about ELECTRONICS? Check HERE First:###