Power supply-2

I have a similar version of AB-3300 just as another brand. The powersupply is good, working fine. Is is just a standard power suply build on a 723 and a few 741's as I remember. Easy to modify if you want to.

Peter

Chinese made?

I have seen very similar looking supplies under a number of brand names (made in China). I recently bought a Mastech dual 0-50 volt version like this:

It has some sort of relay winding switching circuit that changes the AC supply voltage to the regulator as you change the setpoint, to reduce the power dumped into the heat sinks. It seems to work well, but I would have probably designed it with larger filter capacitors.

Same here. I have the triple output version, different brand, but with LCD displays (4 of them, for V + A). I can hear the relays while changing the voltage set point. Opening the case revealed a textbook linear PSU (with an LM324 and a few LM741's). The 5V/3A output has a nice foldback current-limiting design.

Cheap, but does the job nicely and has never overheated. It would be nice if it had multi-turn pots for the set points, other than this it's a nice general-purpose PSU.

Any purchasers?

Ear shit and die you brain dead loon.

What a pathetic loser you really are.

These PSU's are manufactured by Good Will Instruments with HQ in Taiwan

They are often re-badged with other brand names such as ABRA or whatever the supplier wants. They have factories in several countries including China. I have a GW PSU made in 1995 which came out of their Malaysia factory and it has performed flawlessly.

I wonder why they chose that name? I immediately think of GoodWill charities when I see it.