General > General Technical Chat
Show your favorite and most used benchtop PSU
nardev:
Well, the socket and the cable don't have it anyway. This one was good enough for what i use this for :D Buuut.. i might add another cut on the enclosure and add in parallel another bigger socket with a fuse. Good idea ;)
unknownparticle:
I have MANY PSU's, acquired over many years. Not my favourite, but most recent, PSU is a TTi EX4210R. This was donated to me by a friend who works for a big Tech company here in the UK. Status was unknown but I soon found a blown mains input fuse. Being in an impatient mood at the time I replaced it with one of a lower rating and applied power. Fuse was vaporised immediately! So, I checked the input resistance and it seemed ok, certainly not suspiciously low. Next I DL'd the manual from the manufacturers site and had a look at the circuit. It's a switch mode type unit. I started to measure through the components from mains in onwards and it was then I noticed the top blown off the inrush thermistor, but, it measured ok! Then I noticed the board layout didn't correspond to the manual. Some components in the manual weren't on the board! Long story short, although the unit was clearly marked as 240 VAC on the back panel, it had been fitted with a 115 VAC board!!! No wonder the fuse and the thermistor had complained! However, after fitting a new fuse and supplying the unit from my variac it worked almost perfectly! The only fault it has is no fan supply, which is a dedicated supply from a discreet component arrangement in the auxillary supply section. So, I need to locate that fault, which I think is a blown Mosfet. The only other parts needed are the thermistor and main filter caps, one of which is bulged at the top. So, despite the issue, this is a bit of a gift as they retail for about £400!! The reason for the 115 VAC board will be a mystery forever though! I'll post up some further PSU tales in the future!
odium:
home made 30V/5A linear : 3x TIP35 output stage
multimeter is GWInstek GDM-8251A
cheers
Mr Evil:
I only have room for one power supply on my bench. It consists of a couple of those cheap switching regulators that have the nice multicoloured displays, and a couple of slightly dubious off-line switching power supplies, which I fitted into a nice enclosure, giving 2 x 50V@5A.
The dubious power supplies generate a substantial amount of common-mode noise, as well as radiated noise, so I had to fit common-mode filters at the outputs, and cover them with aluminium plates. In the first photo you can see that one channel has had the filter and part of the shielding fitted.
BravoV:
Congratz on your 1st post, and welcome to the forum. :clap:
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