Electronics > Beginners

Manson DPD-3030 PS - modifications possible?

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beanflying:
Nice. Two is better than one  :-+

Checked this one is fairly small diameter for a simple shorting switch with no other circuitry. 3A at 28V is a little underdone maybe but as the voltage drops to zero it should cope. http://au.element14.com/multicomp/r13-548b-05-bb/switch-push-button-spst-latching/dp/1634675

Mine turned up on Evilbay and looked lonely  ;D

Shock:
I brought one of these a few weeks back as well, was cheap and couldn't resist adopting it.

beanflying:
Soft fet switch layout. There is room along the stripe at the back to drop switches in. From the left Voltage on/off LED and Current short to the right of the word. Repeated on the master side. The outer two buttons will fall just on the edge of the stripe not perfect but fairly well blended.

Seems someone made a video  :-+ Soft Latch switch

https://youtu.be/Foc9R0dC2iI

beanflying:
Getting Naked  ???

Nice work the plugs to the display boards are labeled and the silk screen on the boards is clear part of the reason I love these supplies  :-+

Voltage Pots are a 5K Linear taper 026T228F502A1A1 heaps of room behind for a multiturn so more about matching shafts or finding new knobs for the front.    http://pdf1.alldatasheet.com/datasheet-pdf/view/828829/CTS/026T228F502A1A1.html

** edit Current Set pots are a 501 and not a 502 like the Voltage set.

The Pot plates are held in by a single screw with a welded standoff to the front steel chassis. Tops of them are around the strip area, so a little creative metal work should see the switches and boards hanging on there too. This will leave plenty of vertical clearance on the display boards.

Shock:
Are you going to put the circuit directly on or just before the output, or somewhere further back in the circuit?

I was considering (since the current resolution is milliohm accurate) an ideal inline switching circuit would need to have no current draw when both on and off loading the output, plus work in a low voltage scenario (the supply goes down quite accurately in voltage as well).

Or be further back in the circuit as to not effect the regulation and current limiting or be powered separately from the output to have no parasitic effect. You would need the inline switch e.g. FET or mechanical switch if loaded to handle the full voltage and current of the supply.

Dave circuit looks good on the scope but is this still suitable for a series 0-60VDC 3A or parallel 0-30VDC 6A supply?

So are you taking into consideration these problems?

Whats the control setup for the front you want to use, one momentary push button and two status LEDs?

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