Does anyone know how to add a speed controller to a series of 3 or 4 PC case fans? I have a power supply from an old printer & see some quiet fans but want to be able to adjust their flow. (Max RPM may irritate the #^$%&^& out of me).
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The easiest by far is this, or similar doohickey from ebay for about 3 bucks. That’s the route I’d go. Pretty decent way to control a DC motor.
Search for:
12V PWM PC CPU Fan Temperature Control Speed Controller Module High-Temp Alarm
Otherwise if you have an adjustable power supply you can dial down the voltage
Happy’s $0.02
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Literally just get a case fan controller like happy says bro. Wire that to a 12v driver and away
Arctic are really good for sound too
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Have a link
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I used to be a network admin until I abandoned everything except web-browsing & email…so this is a bit embarassing but also very cool. I felt like an old man when I got a new CPU fan & saw all these fancy freon & raditator cooling systems. 
kids these days…
thanks @anon58740919, @HappyHemper
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No danger sir. Anytime
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I use one of these connected with terminal blocks and cheap speaker wire to the fans 
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A variable voltage wall adapter
For all my needs im using these bad boys
https://s.click.aliexpress.com/e/cVCQh0q4
But if is going to be a fan regulator purposes , those small things can be fitting anywhere even inside the power supply enclosed, 5 for less than 5 bucks, the only problem is the waiting time
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So I can deduce from all of this that voltage is what determines the fan speed(within limits)?
Because I have a variable ac/dc(1A) wall adapter… i.e. 1,3,5,9,12 
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That’s possibly the easiest way. Hook it up to that and switch it to 9,5,3 and see the speed slow down.
I’m super old school, I use an old 100 Ohm potentiometer on my fans. 
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damn, thats one sexy fan controller.
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