The integrated circuits used in this oscillator are not very common today, as we obtained it in documentation from the 1980s. The circuit must be powered by a symmetrical source.
The circuit in the figure is based on an LM101A; diodes can be replaced with equivalents. The...
This circuit, with magnetic sensor, uses an operational amplifier of the time. The circuit is from...
Found in a 90s Popular Electronics, this circuit checks if a remote-control transmitter is...