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 was found in the November 1974 Radio Electronics magazine. The voltage depends on the...
This circuit uses a FET to drive an LED with constante currente. The current up to 20 mA can be...
In the figure we have an interesting configuration in which we took advantage of the very high...