This CMOS circuit was obtained in a 1980s documentation. The circuit has a 10-second time delay before firing. The transistor is a general-purpose type and power supply according to the relay.
Very simple, this radio control circuit for short distances was found in an Electronic Design from...
In the figure we have a practical circuit for a 50 kHz bandwidth amplifier using a photo diode as...
This circuit uses components of the time. We found it in a 1968 US documentation. The delay is 100 ns...