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Simple PWM control - Here's a simple PWM control circuit using inexpensive readily-available components.
The circuit component values shown are for a 12V supply but could be altered for other supply voltages less than 15V.
Most of the work is done by a CD40106 hex Schmitt inverter IC.
U1a/R1/C3 form an oscillator running at ~22kHz. Its square-wave output is integrated by R2/C4 to give an approximation of a triangular wave. This wave is summed at the input of gate U1b with a...[/quote]
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Simple PWM control - Here's a simple PWM control circuit using inexpensive readily-available components.
The circuit component values shown are for a 12V supply but could be altered for other supply voltages less than 15V.
Most of the work is done by a CD40106 hex Schmitt inverter IC.
U1a/R1/C3 form an oscillator running at ~22kHz. Its square-wave output is integrated by R2/C4 to give an approximation of a triangular wave. This wave is summed at the input of gate U1b with a...[/quote]
Read more about this article...