This small low current inverter operates at 20 kHz frequency. We found it in documentation from the 1980s. The integrated circuit is from that time.
Found in a 1958’s publication, this receiver uses components that are nbot easy to find in our...
This car battery power supply was found in the June 1990 issue of Radio Electronics magazine....
This circuit, found in documentation from the 1980s, uses an operational amplifier from that time....