One simple second pulse source circuit

  
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It consists of single-junction transistor VTi, resistance Ri, potentiometer RP, capacitor C consisting of relaxation oscillator and amplifier transistor VTz.
One simple second pulse source circuit - schematic

Adjustment potentiometer RP, can change the relaxation oscillation frequency to give 0. 1 ~ 15s time base pulse. After this pulse by VTz amplified output square wave pulse, as the time counter input signal.




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