110V to 5V Module?

[metrologist]

Time's up!

I retrieved this module from a Brother MFP printer and I suspect it will take 110V AC on the white connector and output 5V. I started to draw a schematic but got lost. The transistors are marked 667 and show as 120V 1A npn transistors. Am I on the right track? If it is what I suspect I would use it to power a couple of small 5V fans in a power supply I'm building.

[floobydust]

I see that board as a TDK high-voltage DC-AC inverter for CCFL backlighting. Not a 110VAC to 5VDC power supply.
They take in 5 or 12VDC and output 900-1500VAC at several mA. Enough to give you a nasty shock.
Probably a custom build for the printer display? TDK TAD376 has no search hits.
http://www.mouser.com/catalog/catalogusd/645/2476.pdf

[Zero999]

Yes, it looks like a CCFL inverter. Going from what you've already reverse engineered and the picture of the board, it looks like a Royer converter circuit.

With regards to safety: the output frequency will be above 20kHz and will give you a burn more than a shock and the current will be limited to a non-lethal level.

[metrologist]

Oh, well now I must find a use for it.

I was working on the schematic a bit more and then went to feeding a signal from my sig gen at around 5V, I guess on the output side 

[rsjsouza]

The previous comments are correct. One detail that detracts from your original assumption is that one of the poles of the white connector is directly tied to the negative output - if this was a mains power supply, one of the poles would be directly exposed to the low voltage section. Another giveaway is that the transformer construction is very inadequate for direct mains (50~60Hz) connection - usually at these frequencies the magnetic coupling requires a lot more wire and core material (and not ferrite as its core).

[Yansi]

D667 = 2SD667

http://www.redrok.com/NPN_2SD667_80V_1.0A_0.9W_Hfe160_TO-92MOD.pdf

[rsjsouza]

Oh, well now I must find a use for it.

I was working on the schematic a bit more and then went to feeding a signal from my sig gen at around 5V, I guess on the output side 

Well, if anything, just be glad you did not use the module in the correct way with your oscilloscope plugged on the HV output - the oscilloscope wouldn't be happy with that. 

[Zero999]

Oh, well now I must find a use for it.

I was working on the schematic a bit more and then went to feeding a signal from my sig gen at around 5V, I guess on the output side 

You appear to have got the taps wrong. The centre tap should go to the positive supply, via the inductor and it's likely the transistors' bases are driven from a separate winding. Plenty of schematics can be found by entering Royer converter into a search engine.

[metrologist]

I removed the images so as not to confuse someone in the future, since they are wrong.

[stj]

i just use usb chargers from discount stores.
if your in the u.k. - poundland ones are good ( "BigClive" does teardowns on poundland stuff on utube)

otherwise - inspect them before you trust them!!!!