This small 1 W amplifier uses a Motorola integrated circuit from the 1970s. The integrated circuit used is uncommon today and the power supply does not have to be symmetrical.
This is a commercial circuit of a transistor amplifier of some watts with the OC30 transistor. The 12 V...
With this circuit it is possible to excite direct current relays from an alternating signal,...
The reference source for this circuit is a 1968’s Motorola publication. The circuit can be...