Hi,
I guess I did not explain clearly my problem.
Non inverting amplifier, TL082, works OK creating a nice symmetric curve. I am feeding a Sine curve into the positive pin and amplifying 80X.
Violet line is input from AWG, 50 mV, and Yellow line is output at Pin 1, 4 V.
Full wave rectifier, TL082, is working OK. Feeding in a sine curve from my AWG it gets rectified correctly, e.g. negative portion is inverted correctly and has same voltage as positive portion.
Now when I connect the output of my non inverting amplifier, attach1, to the input of the full wave rectifier, attach2, then the negative portion is only inverted at half its value, e.g. 2 V instead of 4 V and that is my problem. I am clueless. What is different when feeding a sine curve from the output of my amplifier to a sine wave fed by my AWG ? I am using two TL082. One as amplifier and from there I go into the next one.
The Pins 5, 6 and 7 of the first TL082 are not connected to anywhere. Does that matter ? Both TL082 get power from the same source.
Here again the fullwave rectifier circuit
Thanks for any tips.
Rainer