This 1965 Philips circuit uses old company transistors like the BFY51 and BFY50. The circuit is powered by 12 V and the power gain is 8.9 dB.
This interesting low current circuit uses only one diode to obtain a full wave rectified signal....
This resistive sensor was found in a 1969 US documentation. The circuit uses transistors of the...
This circuit uses a sensitive reed relay to control external loads. The time delay is given by the...