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 has an input impedance of 10 M ohms. We found it in the October 1993 Electronics Now...
Found in a 90s documentation, this switch that is also sensitive enough to operate capacitively uses...
This circuit changes the wave shape of a square signal according the values of C1 and R1. Other...