Fritzing

This is a pulse width modulation circuit to drive a dc motor or LED or Piezo Speaker.Simple Project for speed, intensity control.The Capacitence/ resistance and diodes can ebe varied as per need.

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Label  Part Type  BAT1  BC9VPC  C2  Electrolytic Capacitor  D1  Zener Diode  IC1  General purpose bipolar Timer  J1  Piezo Speaker  LED1  Red (633nm) LED  M1  DC Motor  R1  Resistor  R2  Resistor  U1  POT 

 

The Resistance and capacitance controls the pulse. Experiment with various types and choose as per requirements.
The pot controls the modulation variance set by R and C.
The diode can be any as per voltage.

 

Label  Part Type  BAT1  BC9VPC  C2  Electrolytic Capacitor  D1  Zener Diode  IC1  General purpose bipolar Timer  J1  Piezo Speaker  LED1  Red (633nm) LED  M1  DC Motor  R1  Resistor  R2  Resistor  U1  POT