Repairing a Samlex SEC-14 linear power supply, rated 13.8VDC "10-14A". Hong Kong company.
Dumpster rescue, main pc board is RPS-1203 with two filter cap pc boards labelled RPS1220. The same control board is used in many of their models.
The big 4,700uF Hangda electrolytics all took the piss, but no bulging as the bung has a vent.
Inside I expected an LM723 but instead is a few transistors, couple 2N3055's and overall low tech. It's the cheapest power transformer, just loose windings no tape, a bit bigger than a MOT. No safety approvals. PC boards were riveted in.
I drew a schematic and I'm not sure if this is worth five new caps ($15). No current limiting, so I can't use it for charging batteries and realistically it's good for ~6A continous due to the tiny heatsink.
Part of me want to bin it. Any ideas? Or maybe I could get some low cost caps and use a TL431 or add current-limiting. Hmmm.
Dumpster rescue, main pc board is RPS-1203 with two filter cap pc boards labelled RPS1220. The same control board is used in many of their models.
The big 4,700uF Hangda electrolytics all took the piss, but no bulging as the bung has a vent.
Inside I expected an LM723 but instead is a few transistors, couple 2N3055's and overall low tech. It's the cheapest power transformer, just loose windings no tape, a bit bigger than a MOT. No safety approvals. PC boards were riveted in.
I drew a schematic and I'm not sure if this is worth five new caps ($15). No current limiting, so I can't use it for charging batteries and realistically it's good for ~6A continous due to the tiny heatsink.
Part of me want to bin it. Any ideas? Or maybe I could get some low cost caps and use a TL431 or add current-limiting. Hmmm.
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