This circuit was obtained from an Electronic Design from the 90's. The circuit generates signals at a frequency determined by R and C. The selection by the jumpers determines the PWM modulation.
This circuit was obtained in a manual for radio amateurs from 1975. It is a circuit that allows the...
Suitable for battery powered microcontrolled applications this Texas Instruments circuit from its...
This circuit was found in a 1980s documentation. The low voltage circuit uses a PUT. Transistors can...