PWM Speed Motor Controller By IC 555| Circuit Project

This 555 timer based PWM controller features almost 0..100%

This 555 timer based PWM controller features almost 0..100% pulse width regulation using R1,
while keeping the oscillator frequency relatively stable. The frequency is dependent on values of R1 and C1,
values shown will give a frequency range from about 170 to 200 Hz. Any 555 chip will do, CMOS is fine as well.
Diodes are not critical, I used 1N4148. Total cost of parts is about $2. As the whole thing is quite trivial,
it’s very easy to build on prototyping board like I did (as you can see, one of capacitors –
C1 is replaced with different value, 0.047 uF to be precise):

Circuit diagrams and schematics - Electronic projects

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PWM Speed Motor Controller By IC 555