There is a fan controller based on the LM3914 LED driver here: https://www.ssguitar.com/index.php?topic=2591.0
**broken link removed**
I'd like to build it, but I'm concerned that the LM3914 would burn up driving a 12v 150ma fan. Am I right in thinking that if you used a 12v fan as in the schematic that the chip would need to handle 1.8w (it's only rated for 1.36w), or is that rating how much heat it can dissipate? In which case, it shouldn't be dissipating more than maybe a half watt or something for it's own purposes as the fan will "eat" whatever voltage the LEDs don't use.
**broken link removed**
I'd like to build it, but I'm concerned that the LM3914 would burn up driving a 12v 150ma fan. Am I right in thinking that if you used a 12v fan as in the schematic that the chip would need to handle 1.8w (it's only rated for 1.36w), or is that rating how much heat it can dissipate? In which case, it shouldn't be dissipating more than maybe a half watt or something for it's own purposes as the fan will "eat" whatever voltage the LEDs don't use.
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