This circuit is from a 1972 Motorola publication. The used transistor can still be found, but it can be used equivalent. The circuit is powered by the amplifier with which it must operate.
This circuit generates audio signals for testing amplifiers and other equipment. The potentiometer R5...
This type of automation is very important because it serves a multitude of applications, ranging from...
This circuit activates an old conventional cassette recorder when the telephone line is answered and...