Found in a 1964 Electronic Design, this circuit uses a common LDR and transistors from that time. The relay is a high sensitivity type.
This shield circuit allows recording of the signal from a serial output on a cassette recorder, with...
The model aircraft spark plug filaments operate with a low voltage of the order of 1.5 V. This...
This circuit, found in US documentation, can measure the power of transmitters up to 10 W, given...