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Thread: Adjustable bench power supply - buy or build yourself?

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    Pair of es460c boards in the PCSA-4 circuit board holder, connectors & crimps here...slowly getting closer.

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    Johnno (16-05-20)



  • #82
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    Oh yes, replace all the RIFA caps.. I watched that Video you posted and the damn thing exploded.. /Great vision

    That would definitely Never look good after fixing the unit and that happens.. Those old RIFA caps do look great exploding thou'. lol

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    Johnno (29-05-20)

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    Two bricks refurb'd and reassembled, leaving the third board off it's heatsink for now, so it's easy to double-check the connector pinnings.




    Last edited by wotnot; 22-05-20 at 01:39 AM.

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    Johnno (29-05-20)

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    Sat down and put the necessary wires in a connector,




    Grabbed a brick, plugged it in, attached multimeter and turned it on...tiny click as the relay closed, and then straight to voltage, quiet as a church mouse..



    Put the last unit back together, get a load happening and test all three ...think more about a case, and hopefully the dps50v15 isn't too far away...

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    Johnno (29-05-20)

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    I hadn't actually taken that much notice, because the units are very similar, but I was actually supplied 2 x ES460C, and a ES460B variant. When I was testing the units for coldstart/idle, I noticed the ES460B was less than happy about something ; I figured it had something to do with the add-on voltage adj. circuit. Typically I run this old gear up first with no load for a couple of hours, and noted the B version was +/- 1.5volts every now and then, whereas the C versions are rock solid.

    Then I'll run things at about 25% load for a couple of hours, and keep adding load until I reach full output and/or the unit protection circuitry kicks in...right now, the C units are taking turns at a 50% load;




    They seem happy, however as soon as I put more than 1amp on the ES460B unit, it started shutting down/restarting....so it has a problem ~ I put it aside for a closer squizzy later, after all... I have 2 working units, so it shouldn't bee too hard to find the problem.

    I contacted the seller, to let him know I'd been supplied an 'odd bod', and passed on a bit more information about getting these things going. Without even asking for a replacement, the seller immediately said they'd send me another ES460C, and I can keep the B version. Awesome.

    Couple of things I pointed out to them.... the circuit diagram in the ebay listing, omits one very important connection -- the mains earth. Without that, all the high voltage spike/transient suppression is useless;



    Then, if one ever buys these things, the easy/quick way to refurb and get them going, requires these bits;

    *DIN41612 plug to suit units - RS Stock No.757-7942
    *DIN Power crimps to suit - RS Stock No.741-2933
    *2 x 4n7 RIFA (C4, C8) - RS Stock No.210-594
    *1 x 3n3 RIFA (C79) -- modded parallel of RS Stock No.875-2419 + RS Stock No.875-2428

    Tested the DC-DC buck converter to 10amps and it didn't explode =) Got pretty warm, but withstood the load for a good 10mins. Still, better stick that in the cooling airflow to be sure.

    The volt/amp gauge is useless... volt reading is good, amps read 2000mA high and will not zero reset/adjust within spec ; yet another ebay return =)


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    Johnno (29-05-20)

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