Found in a 1968 Motorola documentation, this circuit operates at 1 kHz and can deliver 20 V from 12 V. Transistors support modern equivalents.
This simulated circuit uses a 741 (Operational Amplifier), but other operational amplifiers can be...
Using the 555 and 4020, this timer was found in the July 1994 Radio Electronics magazine. The...
This circuit was found in American documentation from the 1980s. The integrated circuit used is a...