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.
In the figure we show how to use an old portable AM or FM radio as a test amplifier or signal...
Among other applications, the 1960 Sylvania transistor manual indicates this timer for chess...
This circuit for voltmeter has an output of 1 V for 100 uA having been suggested by American...