Found in Popular Elecronics, this configuration also appears in this section, but obtained from other sources. The 14.4 V supply allows the circuit to be used in the car.
This circuit that simulates the sound of a drum is part of an article published in the Radio...
This circuit was obtained from an Application Note from Linear Technology that manufactures the used...
This is a well-known RC oscillator configuration using a 741 operational amplifier. The circuit is from...