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.
April 2017 - Texas Instruments bq51222 integrated circuit for chargers and other Qi wireless power...
Using two 567 PLLs, this circuit recognizes two audio tones in sequence providing a signal for a...
This solar powered circuit was found in a 1991 documentation. The transistor is a general purpose...