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Circuits designed by David Johnson, P.E.
Last Updated on: Monday, July 11, 2016 01:59 PM

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Pulse Width Modulator (PWM) Circuits

555 Timer Forms Simple PWM Motor Controller  -  Using a CMOS version of the 555 timer, this circuit can be used to control the speed of a motor by adjusting the duty cycle of the pulses sent to the motor . . . [Circuit by Dave Johnson P.E.,  02/01/07]


Classic Linear 5v Supply Using 6.3VAC Transformer  -  There are times when you wish to control a pulse width modulation (PWM) signal with a DC voltage, ranging from 0v to 5v. This voltage is often created by a computer interface.  The circuit below performs this voltage to PWM conversion. PWM signals are often . . . [Hobby Circuit designed by Dave Johnson P.E.,  10/31/10]


Computer Controlled PWM Circuit  -  There are times when you wish to control a pulse width modulation (PWM) signal with a DC voltage, ranging from 0v to 5v. This voltage is often created by a computer interface.  The circuit below performs this voltage to PWM conversion. PWM signals are often . . . [Circuit by Dave Johnson P.E.,  10/31/10]

PWM Circuit for Motor Speed Control  -  Sometimes you want to slow down a brush type DC motor. The most efficient way to do this is with a pulse width modulation (PWM) technique. The hobby circuit below can operate from about 3 volts to 15 volts. The frequency is fixed at about 2KHz but the pulse . . . [Hobby Circuit designed by David Johnson P.E.,  12/16/07]


PWM Motor Controller uses a 555 Timer  -  Using a CMOS version of the 555 timer, this circuit can be used to control the speed of a motor by adjusting the duty cycle of the pulses sent to the motor . . . [Hobby Circuit designed by David Johnson P.E.,  02/01/07]


Reduced Power Relay Driver  -  Relays can handle a lot of power.  However, for certain power sensitive designs you would like to reduce the power needed to hold a relay closed.  The circuit below performs such a task.  It uses a single CD4093 quad NAND gate.  When the “on” logic input . . . [Circuit by David Johnson P.E.,  08/03/08]


Relay Driver with Reduced Power  -  Relays can handle a lot of power.  However, for certain power sensitive designs you would like to reduce the power needed to hold a relay closed.  The circuit below performs such a task.  It uses a single CD4093 quad NAND gate.  When the “on” logic input . . . [Hobby Circuit designed by David A. Johnson P.E.,  08/03/08]


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The circuits on this site are designed by David A Johnson - unless otherwise noted.  David A. Johnson & Associates.  All Rights reserved. 
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