This amplifier is from Motorola's 1990 Linear Databook. The circuit can be used with operating amplifiers with the same characteristics and the power supply must be symmetrical.
This circuit is from a Popular Electronics from the 80's. The components used are not common...
We found this Popular Electronics puma circuit from the 90s. Transformer T1 determines the...
This circuit produces a signal whose frequency decays from 500 Hz to zero in a time interval given...