Recently, my bench power supply stopped working properly. It is a digitally controlled supply, and the digital to analogue convertor, the analogue to digital convertor (for the displays) and the current limit have all gone very out of spec.
The error on the current is +100%, the error on the voltage is about +70%. The calibration menu of the supply only allows for 5% compensation - something inside is very wrong. I've examined it in detail, but there are no blown components. In addition, nothing is labelled - no voltages, cables or connections. I've tried adjusting all the pots to try and work out what they do (after marking their original positions), but I've come to realize the supply has had it for precision work, and is now only good for basic tasks - eg powering a battery charger.
So, I'm on the lookout for a new power supply. I like the idea of a double or triple supply, as I often work with high power LEDs, so need 12v for the LEDs and 5v for the control circuitry. Obviously the supply needs current limitting, and voltage and current readouts.
I want to spend below £200 on this supply, and probably get a 0-30v 5A supply.
I've found **broken link removed** power supply which seems to fit the bill - I'd appriciate any ideas on it.
The only downside seems to be a lack of output switches - but I could either fit these (internally or externally), or just disconnect the wire when needed.
Power supply manual
Power supply schematic
I'm impressed the manufacturer published the schematic (see above) - it will make it much easier to repair if anything goes wrong.
Any thoughts? I'd rather get something new than something second hand.
Cheers
Andrew
The error on the current is +100%, the error on the voltage is about +70%. The calibration menu of the supply only allows for 5% compensation - something inside is very wrong. I've examined it in detail, but there are no blown components. In addition, nothing is labelled - no voltages, cables or connections. I've tried adjusting all the pots to try and work out what they do (after marking their original positions), but I've come to realize the supply has had it for precision work, and is now only good for basic tasks - eg powering a battery charger.
So, I'm on the lookout for a new power supply. I like the idea of a double or triple supply, as I often work with high power LEDs, so need 12v for the LEDs and 5v for the control circuitry. Obviously the supply needs current limitting, and voltage and current readouts.
I want to spend below £200 on this supply, and probably get a 0-30v 5A supply.
I've found **broken link removed** power supply which seems to fit the bill - I'd appriciate any ideas on it.
The only downside seems to be a lack of output switches - but I could either fit these (internally or externally), or just disconnect the wire when needed.
Power supply manual
Power supply schematic
I'm impressed the manufacturer published the schematic (see above) - it will make it much easier to repair if anything goes wrong.
Any thoughts? I'd rather get something new than something second hand.
Cheers
Andrew