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 conventional power supply uses integrated regulators for 1 A. Several regulators are used. The...
This circuit was found in an old publication from 1989 but can still be assembled today with BD135...
This circuit was found in a 1988 publication. The circuit is an alarm with interrupt sensors that...