This circuit activates a horn from an audio signal. This can be used for remote control via audio signals. The circuit is from a Radio Electronics from October 1965.
Found in documentation from Analog Devices from the 90s, this amplifier uses a component from the...
This charger was found in an 80's Electronic Design. The circuit uses components from that time....
This double tone generator uses a specific integrated circuit, having been found in a 1977 CMOS...