DickSmith D-3812 Power Supply Modifications?

[AmmoJammo]

So I picked up this power supply yesterday, not really sure why, but for $20, why not! Was still in the original box, hardly ever been used.

After buying it, I realised its 13amp rating is only at maximum voltage, (15volts) because the transformer only has a single secondary winding, so the heatsink can't dissipate the heat generated at lower voltages.

So, I'm considering adding a switchmode pre-regulator, Unless someone has a better idea?
The other thing is, this power supply appears to have overload protection... it won't even power up with a 50 watt car headlight globe connected to it...

I don't suppose anyone has a schematic for this PSU so I can have some idea of what I'm doing? It doesn't have adjustable current limiting either, but the higher voltage/lower amperage versions of the same PSU do...











Looks like quite a bodge of a power supply, but the case is very solid! 

Thanks!

[barjammar]

Hi
Do you have any further information? I noticed I have this in my garage. I might run some tests on it.
Thanks
Barry

[wilfred]

This thread may contain something useful.
https://www.eevblog.com/forum/repair/faulty-dse-d-3800-power-supply-similar-to-manson-ep-925/msg1199719/#msg1199719

I attached a circuit DSE sent me of the Q-1760 which may be similar but with the current limiting. I hope it is somewhat useful.