Daily Archives: December 14, 2005

PWM Fan control

It is simplest PWM fan speed control circuit from scrap. The detail values are not very critical. Here is the schematics: R1-~10K, R2-~100K, C1- 0.01μF, chip- TL494, KA7500. It would be good practice to put some electrolytic capacitor between Vcc … Continue reading

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Values of the capacitors

In every schematic you can find few capacitors. Sometimes you remove old caps from some junk boards. And sometimes it is difficult to determine the cap value. There is some standards for cap coding, but not every manufacturer take care … Continue reading

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