This amplifier uses a 1975 integrated circuit, which is uncommon today. The circuit has a gain of 30 dB and uses a transformer-less output with 9 V power.
This flasher with two power transistors was found in a Radio Electronics magazine from September 1961....
The configuration already explored in our Circuit Bench section is from the National...
We found this circuit in a Popular Electronics from the 90's. The circuit activates an oscillator...