Pulse generator as astable multivibrator

  
The pulse repetition rate is selected by positioning SI to the desired position and the rate remains essentially constant when the resistors which determine on-period and off-period are adjusted.
Pulse generator as astable multivibrator  - schematic

Resistors Rl and R2 bias the CA3130 to the mid-point of the supply-voltage, and R3 is the feedback resistor.




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