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 found in the April 1984 issue of Radio Electronics magazine. The integrated...
The presented circuit was found in the National Semiconductor's Linear Applications Handbook from...
This circuit is basically the same as the previous configuration (CB15616E) with a power stage with...