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Old 2nd August 2003, 10:32 AM   #1
diyAudio Member
 
Join Date: Nov 2002
Location: London
Default wallplug mod

Hey...

I have a wallplug rated at 15V/750mA. On inspection with a dmm however the output is more like 25V, and on opening it up u could see there was no regulation at all - just the transformer, a cap, a cpl o diodes and that was that...

I was hoping I could use this tranny to obtain a dual output supply giving me 5V(ca 450mA) and 15V(ca 300mA). What would be the most suitable approach to accomplish this? Would a 7815 and 7805 be the best way? ATM, i just stuck a 317 in the psu to get the out to 15V, then in the instrument i'm using i had another 317 to get the voltage down to 8V before going into a 7805 for the 5V..:/ works but things get hot! admittedly i aint stuck a heatsink onto the 317 in the wallplug, down to they're being a big cap in the way (the space for a VL was already on the wallplug pcb even tho one wasnt originally placed)...

Pointers appreciated....

Peesh

Dan
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