Battery adapter

Yesterday i did a 5 minute hack.
Because i have lots of old AA batteries with some residual energy (i guessed) lying arround, but my mp3 player needs AAA batteries, i made this adapter, to make use of the old AA cells.


The AA cells were used in an old compact camera. They do not work in the camera any more - thx to the crappy cam! - but with one of those AA cells i was able to power my mp3 player for about 2 5 hours and the battery is still not empty!
Quite nice for a batterie which seemed to be empty. ;)

I think the images are self explaining.

Repairing...

Currently (better: since a few weeks, because i have no time and passion) i'm repairing a 24V DC power supply.
It can deliver around 24 amps - so... it could be usefull.


One error was found quickly: the pcb was burned and a diode was defect.
The defect pcb was even giving smoke signals after powering up the device.
And somewhere on the case was a bit of... voltage. I got almost electrocuted, after i touched the metal chassis.
Unfortunatly the diode was not a common type, but i got two pieces for a lot of money at a electronics dealer in the next bigger city.
But the power supply didn't worked anyway.
After turning the power supply on, the fuse in the fuse block was shutting down the power for my room... yeah. An electrical bolt flashing over the diode might have been the reason...

After disassembling the power supply even further i've found another error: an 300 watt MOSFET was dead. A wonderfull 0 ohm bridge.
The damn think cost ~10 €.
At least it is not as rare as the diode.
Hopefully i can reassemble the device again after fixing it. : (