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.
The central operating range of this small short-wave transmitter is around 27 MHz, but the coil...
This crystal-controlled 1000 kHz oscillator was found in 1980s American documentation. The...
This circuit is from the time when cars used contact breakers. This 80's version measures the dwell...