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 circuit the visually impaired can easily locate important places inside the house, such...
The configuration shown is from the National Semiconductor Linear Applications Handbook. The...
This circuit controls a relay from the light incident on a sensor. The sensor is an LDR and the...
