Found in Popular Electronics from the 90s, this 1.5 A power supply can supply voltages selected by a switch. The splitter resistors determine the output steps.
Using two 567 PLLs, this circuit recognizes two audio tones in sequence providing a signal for a...
We found this transmitter in a documentation on espionage from the 90s. The circuit is...
We find this circuit in a Radio Electronics of July 1984. It consists of the traditional version of 1 A...