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 allows the use of a milliammeter in the measurement of low frequency alternating...
This circuit can be used as an answering password system in a store, office, or other location....
This circuit was found in a documentation by A. Fanzeres making use of a grounded metal housing...