Electronics > Beginners
Odd output from Elenco XP-15K Power Supply
alsetalokin4017:
Before taking it all apart, let's first make sure it's put together right in the first place!
I'm sorry but there are more than just the one solder joint that look questionable to me. If this were on my bench the first thing I'd do is to go back over _every_ solder joint with some good leaded solder, flux and a properly heated and tinned iron. Then inspect carefully for solder bridges (I think I see one or two) and correct them.
ArthurDent:
I believe alsetalokin4017 is correct that there is a problem with the soldering and you should reread the section of the assembly manual on soldering (shown below) and check each solder joint. Reheat with solder with flux and make sure that the solder freely flows to both the component lead and the pad on the circuit board. As previously mentioned, also check that there are no solder bridges shorting runs together. If you're lucky, nothing will have been damaged and resoldering will cure the problem.
tomherrick:
I suspect your suspicions are correct. I had one heck of a time soldering this project. I picked up a 25W Weller soldering iron and it took forever to heat the wire and board. I used a 250W gun on the pot leads and those worked well, but it's a tad clunky for the small stuff. Plus, it's been over 50 years since I did any electronic soldering...
tomherrick:
Well, whaddya know??? 'Twas the soldering - or lack of. The output is, however, a tad on the high side. The range is supposed to be from 0 to 15VDC. Perhaps a resistor is a little toasty?
rf+tech:
Congratulations :-+
As for the few extra volts, you deserve them ;D
Limiting the output to 15 Volts would require adding a 10 kOhm resistor in parallel with the pot, to reduce the effective resistance to 1.65 kOhms.
That's up to you, whether to pursue the extra effort.
RF+ Tech
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