The integrated circuit used in this 70's application is not common today. The circuit consists of a small audio amplifier with few external components.
Here we have an interesting circuit found in a 1981 publication that causes two LEDs to flash...
This circuit was found in Delco documentation from 1965. The transistor is of the time, but any...
This circuit transmits signals to an FM receiver at a distance of up to a few tens of meters. The...