Datasheet of This amplifier uses a pair of complementary transistors at the output and can provide 1 W of audio at a load of 3-ohm. Higher impedance speakers can be used. The circuit is from an English publication from 1986 and TR1 can be a | BC548. The supply can be done with voltages from 9 to 18 V. The trimpot adjusts the resting current, which must be in the order of 20 mA.
With this source, it is possible to obtain a higher output voltage than that obtained by the...
This alarm circuit triggers when S1 opens. The circuit from a January 1975 Radio Electronics...
This circuit was suggested by Signetics in 1980s documentation. The circuit makes use of the...
