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Old 11th Jun 2021, 3:34 pm   #1
g0hze snowy
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Join Date: Oct 2013
Location: Peterborough, Cambridgeshire, UK.
Posts: 314
Default ISOTECK IPS 1810 variable power supply

Good Afternoon Gents and gentesses, i have the above power supply, it appears to be working ( well sort of), i get a variable voltage and current.
When i attach it to my electronic load it delivers a full 10 amps without any worries ( from the front panel) but on having a grope at the twin heat sinks at the back, one is considerably hotter than t'other.
Ah ha says i, those 3 x 2n3055 ( there are 6 in total) are lazy and not doing their share of the load, i elected to replace all the 3055's, when they turned up 1 had its emitter to case lead rusted almost thru', on the new ones, so i chose 3 others and fitted those, the supply didn't work again, took them out and replaced them with originals and it worked, probable Chinese copies, sent them back for a refund.
Ok so that war and peace over with, Is there anybody out there in radio/electronics land with a circuit diagram/schematic that i can beg borrow purloin a copy of to assist with identifying a possible fault with this item.
Thanks in anticipation
Snowy G0HZE
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