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 circuit, which can be used as a shield, was found in a 1980s documentation. The circuit can be...
We found this circuit in an English publication of 1976. It can be easily assembled by changing the...
This switch is triggered by the touch of the sensors, which can be two metal plates. These plates...