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Siglent SPD4306X Quality

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aarons:
Well I removed the connector housing from the stock fan, but it was a JST XHP-4. Here is a picture of the fan, and also a bit of the fan PCB, where you can see the 3rd and 4th wire are connected to pads labelled TR- and TR+. Those signals are the two sides of two thermistors in parallel.

KungFuJosh:

--- Quote from: aarons on December 07, 2024, 02:13:50 am ---Well I removed the connector housing from the stock fan, but it was a JST XHP-4. Here is a picture of the fan, and also a bit of the fan PCB, where you can see the 3rd and 4th wire are connected to pads labelled TR- and TR+. Those signals are the two sides of two thermistors in parallel.

--- End quote ---

That sounds like pretty common 4-wire fan setup? I don't know those circuits well, but I would guess that if anything isn't standard, it would be the order of the wire connections. I wouldn't expect a manufacturer to reinvent a basic PWM fan.

aarons:
The standard 4-wire fans has a tachometer signal output and a PWM signal input.

KungFuJosh:
There's no PWM signal coming from the PSU PCB? Is it really just 2 positive and 2 ground wires? That's really odd.

Have you tested the fan separately from the 4306X?

aarons:
I did hook up the original fan to a 12V supply and tried giving it PWM on those extra pins but it didn't do anything. Thats when I peeled back the sticker and saw the silkscreen. I suspect I damaged the speed control logic in it because now it only runs full speed, even with a 250k pot across those two terminals.

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