This 1988 circuit makes a back-and-forth of LEDs whose speed is controlled by P1. All components used are common and the circuit can be powered by voltages from 6 to 9 V.
This low distortion circuit was found in a 1964 Electronic Design. The transistor admits...
This PWM circuit was found in an American publication from 1978. It consists of a simple control that...
This tone-modulated transmitter was found in recent English documentation. The circuit operates in the 27...