Since this is a Dual Voltage unit, I could not test it with my external 12VDC PSU. I had to opened up my HX08 Tower to access the female Molex connector from the PSU to get the 5V signal. Here you can also see my other obssession I have with Sunon fans!! From the 60mm, up to the 120mm! They were used for the test.

Test bed! Click to enlarge

Sunon babies! 60mm up to 120mm! Click to enlarge

I powered up the system & proceed to test the unit. First stop was the 5V line. The Blue LEDs lighted up, indicating that I had the circuit correct. The 60mm, 80mm and 92mm all started up without a hitch and continue to spin. The 120mm had a little trouble starting up though! Please take note that different fans will have different start up voltage and will react differently towards the 5V signal. Underpowering a fan will not damage the fan, neither will it extent it's lifespan. So you do this at your risks.

Blue LED for 5V.... Click to enlarge

All OK...except the 120mm! :O( Click to enlarge

Now it's time to test the 12V signal. With a flick of the switch, the Blue LEDs goes off and the Red LEDs lighted up, again indicating the correct circuit wiring. This time, all the fans spins at their rated capacity. One thing to take note is that "none of the fans stalled when switched back to 5V!". Which is great!

Red LED for 12V.... Click to enlarge

COOL! But noisy! Click to enlarge

Dual LED goodness!
Click to enlarge

Finally, you now can turn down the "volume" of your PC fans when you're just surfing the web or doing some work. Now, you might find that your fans would not spin comfortably in 5V, so as Cliff A would say, "Out of necessity, comes invention! In the form of what is commonly called the "7 volt trick". That's exactly what I have in mind next for you guys! So stay tuned! Here's the schematic diagram of the circuit!

Schematic diagram
Click to enlarge

As usual, mail me with your Qs or feedback! Happy soldering!

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