With this circuit you can produce the sound effect passing from one channel to another. The circuit is from Mullard documentation from the 1960s. The transistors may be the BC548.
This circuit uses the 7815 regulator to obtain a voltage for motor control num shield for PC. The...
This 12 V to 110 V inverter with 100 W was found in a 1977 Signetics manual. The transformer must...
This basic version of the timer with the 555 was found in documentation from the 1980s. The relay...