Electronics > Beginners
Manson DPD-3030 PS - modifications possible?
beanflying:
One LED only for voltage output on or off. Current set momentary short would do the job nicely so no need for an LED IMO
So default to off on startup. Push to turn outlet on and push again for off. Might pay to have it also reset on current set?
I need to do some more looking but there is a pair of fine wires going to the output boards that I suspect are sense wires go to the next board back near an 8 pin DIP chip (opamp??) that I haven't looked at. If they are then a tiny voltage drop on a fet before the final outlets won't be an issue. Set voltage unloaded should remain the same loaded?
As to accuracy I ran all the channels up against my Agilent today and on voltage were within 20mV across the range. Didn't load it so not sure of the current settings.
Should also note I am doing the nuts and bolts ahead of the electronic design while I have it stripped :scared:
beanflying:
Board behind the outlets. Shunts voltage relays and such. All through hole so it should be simple to hack. It may even be easier to hack into the relay circuit for the voltage control and just drive a coil?
Shock:
This is how the front end is switched (relays) for series and parallel.
beanflying:
Thanks I will have a good look tomorrow. Just worked out some spacing for the front panel. Silly :rant: made the spacing 2.5mm wider on the right than on the left.
Anyway 2x8cm board is perfect. Just back one set of holes on the left gets 3mm padding from the button edge to the letters.
Shock:
Both the master and slave supply (at the AC end) are two separate secondary windings each with multiple taps. The master and slave both each have an RL101 and RL102 relay (double throw to single pole) which selects from the taps and feeds into the AC input of the fullwave rectifier AC input. From there the DC positive rails go to two ganged series pass power transistors 2SD1975 the base of which are controlled by the voltage regulation circuit. Then it's current controlled and runs through the ammeter, voltmeter then relays to control the series and parallel (as shown in my previous post).
You could mod or switch off at the winding relays at the AC. Or turn off the power transistors at the base so the positive power rails have no supply. Or even switch off the DC anywhere, but the problem is unless I'm wrong the voltage displays right next to the output in the circuit. Switch off the voltage anywhere before that and you have no idea of what voltage you're enabling when the output is off.
Anyone else done this kind of thing feel free to chime in.
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