Wednesday, May 20, 2009

Nagative voltage generation using 555 timer

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.


Download this schematic diagram.


Download semiconductor datasheet parts. (PDF Format)

1. NE555

2. BD140


PWM Speed Motor Controller By IC 555-Electronic control circuit - [Link]

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