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Author Topic: getting more watts  (Read 2978 times)

linear

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getting more watts
« Reply #20 on: April 22, 2004, 10:21:06 AM »

Okay, there are PWM chips you can get, MIC502 is a decent one. But if I understood you correctly, you want to retain the existing fan controller and use it. The emitter follower design does exactly that. It's just a current amplifier for the variable voltage output of your existing fanbus.

On cpemma's emitter follower diagram, the left hand part is a voltage divider. You already have that, it's your fan controller. All you need is to add the one transistor to the output, it will amplify the current.

>i want to use a power supply SEPERATE from the fan controller, or else the fan controller will just fry itself

I'm pretty sure my solution works out fine for that. The transistor's base circuit will draw a small current from the controller. The emitter circuit will provide a large current to the fan.
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