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.

 

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 
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jewelmm9 4 years, 2 months ago

how can i test my circuit.......?please help me.......