So.. finally bit the bullet and got myself a nice bench power supply. I had seen pics on here of someones Instek 4303, but since I didn't need the quad outputs I went with the base double output model 2303, hoping that the inside was much the same, and it was! I got it from Test Equipment Depot via Amazon since I had a bunch of reward points stacked up I only paid $100 for it which was a nice way to maximise my budget.
Its got a nice toroidal transformer, the knobs turn as smooth as a babys bum.
Not having a real power supply before I didn't quite realise how it worked. If you turn the amps to zero, the DMM will register the voltage but the PSU display shows 0. If you adjust the amps, you'll get a reading to match. Also without a load, the amps display stays at 0, so I stuck the jack into the DMM 10A slot and voila! Amps registered on the PSU.
So once I had my amps dialed in, I yoinked that, and put it back in for volts and dialed in 5v. Since the knobs are so smooth you have to hunt to get say, exactly 5, otherwise a bees dick will shunt it from 4.8 to 5.1 etc.
If your output switch is off, the display will be 0.
All readings on the display matched on my DMM. The PSU even came with a calibration printout from the factory, I dont know if this is standard or not, I did notice no calibration sticker on the unit so, I will take that calibration paper for what its worth, 0$.
The inside looks much like the photos from Cybergibbons Instek GPS4303 with some slight differences.
front view
![](http://i.imgur.com/Jah3Cl.jpg)
internals from the side
![](http://i.imgur.com/X5b2Ql.jpg)
the tallboy
![](http://i.imgur.com/6s5khl.jpg)
outside fuses are glued down, the two in the middle are not.. odd..
![](http://i.imgur.com/H4rZRl.jpg)
hmm a Dynamic Load jumper config for the right side (ch1)
![](http://i.imgur.com/4jMzcl.jpg)
the left side (ch2) has.. a bunch of pots and the same dynamic load jumper
![](http://i.imgur.com/F7spAl.jpg)
on top of the heatisnks...
![](http://i.imgur.com/KCGXcl.jpg)
you can see the tallboy is glued down and the pcb is labled PS11P02A
![](http://i.imgur.com/5x1gpl.jpg)
larger versions of the images;