The integrated circuit used in this' 90s amplifier is not very common today. The supply is 24 V, the gain is 50dB and the input resistance is 100 k. The circuit is from an old circuit manual.
This circuit consists of a simplified Hartley oscillator that changes the frequency according to...
This circuit generates signals of various frequencies and waveforms, making it useful on the...
I found this circuit in an old English magazine from 1979, but it can be easily assembled with...