We found this time base of 0.1 to 90 seconds in a circuit manual from the 90s. The single-use transistors used are common and the frequencies given by the adjustment by the potentiometer.
This small transmitter has an RF amplifier stage with coupling made from the central socket of the...
Found in a 1965 Motorola documentation this circuit drives magnetic-type fuel pumps found in cars...
This circuit simulates a multi-position switch using programming buttons. The circuit is from an...