I had a switchable voltage 240v AC to DC transformer (Maplin made) that stopped working.
So being amazingly enthusiastic I took it apart and desoldered everything with my nice desoldering station.
Amongst the components I have is a yellow tape wrapped transformer that says:
PQ2620-SE1535
SSEC 78246
Searching in Google I can find lots of PQ2620 datasheets but nothing that corresponds to the other info I have.
Any ideas please?
TIA,
Chris.
Do those data sheets not work?
Some of those other codes are probably things like manufacturer ID or production line/date or such.
They seem to refer to the right kind of transformer but there appears to be lots and lots of models of differing characteristics - but none that I can tie down to this specific unit.
So what do you want to know :
Measure the ac output voltage of the secondary winding.
From the original PSU nameplate you will be given the power output (Volts DC x Amps)
The secondary current rating is Output Power / measured ac volts
Well, not being very experienced in these things I expected it to have 4 wires, one of each end of a pari of coils, but it appears to have 6 wires.
One one side of the transformer there are two pairs of three pins, but it doesnt have the middle pin of each set fitted, and on the other side there are a pair of insulated wires (one black and one yellow) coming out of it.
I'm not quite sure what to make of this so was looking for into to help understand it.
Thanks for your replies so far.
Measure the continuity with a meter and see how many separate coils you have. Then you will have a better idea of what you have.
Based on the original post the info is for the core set and the bobbin. Its a switched mode transformer. The datasheet for the cores:
The rest is customer winding information.
An LCR meter will give you winding ratios. L=N2*AL where L=inductance, N=truns, and AL=effective inductance coefficient aka Apparent Inductance.
Honestly, unless your transformer shows signs of overheating(melting/scorching) and it passes continuity tests (for every wire there is a corresponding wire that shows conductivity), its unlikely to be the failed component. On the other hand, if it looks all melty... you can bet a lot of other stuff went wrong.
In the words if a well known troubleshooter : "It's always a capacitor"
for the curious:
http://www.edn.com/blog/Anablog/38107-Alan_Martin_EDN_Engineer_Extraordinaire.php
Is the point to find a replacement part, or is the point to classify the part so you can re-use it in other circuits?
Many transformers actually divide their secondary windings in two for various reasons. For example, you can choose to get double the current in parallel, or double the voltage in series. This is a very common configuration.
It's likely the insulated leads are the primary winding.
Potential re-use.
Seems a shame to throw these components in the bin if they are still workable.
Thanks for all the replies guys 