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Quarantine Fan PWMer

Scavenge whatever I have laying around to make a PWM capable fan not so loud.

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So, I have this 12V 40x40mm server fan. It's *loud* but it does have a wire that accepts a PWM signal.
Not only is this whole COVID-19 thing going on, but it's a public holiday so no chance of help from the outside. Looking around in some rubbish I've laying around, I pried loose what I could, and stuck it together.
No ordering any PCBs for this, no buying any parts. Just some snips, and a soldering iron.

Here's what I came up with.

circuit.jpg

Schematic of how everything got stuck together

JPEG Image - 38.29 kB - 05/05/2020 at 16:11

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falstad.txt

circuit as tested on http://www.falstad.com/circuit/circuitjs.html before soldering everything together

plain - 682.00 bytes - 05/05/2020 at 16:08

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  • 1 × 555 timer IC Found in the dish on my desk
  • 2 × G30 schottky diode Desoldered from an old HDD PCB
  • 2 × 1nF ceramic capacitor Pried from an old PSU
  • 1 × 68µF tantalum capacitor Desoldered from an old mobile phone
  • 1 × 6.8KΩ resistor Harvested SMD version from an old PSU

View all 7 components

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