DC PSU output?

[playman]

Hi there, I was given this PSU and I was wondering if it was working correctly?
I messure 14.4v out of it at max, and 2v when at minimum, is that normal?
the gauge can go to 30v and 5A, is that not the capability of this unit?

what would the performance of this unit consideret to be? terrible, ok, fine etc.

now, if it's only capable of reaching 14.4v is there any way to amp it up, to about 30v?

[dumpystig]

Re: DC PSU output?

There should be a Rating label on the rear/underneath the case, giving details of input/output volts/amps etc..

If not, google the make/model - I can't make out the manufacturers name @ top left...

[humblesmith1]

Re: DC PSU output?

You probably can't up the voltage by much.

If you measure the input to the To-3 on the heatsink your maximum output would be that minus about 1.25 volts.

[playman]

Re: DC PSU output?

There should be a Rating label on the rear/underneath the case, giving details of input/output volts/amps etc..

If not, google the make/model - I can't make out the manufacturers name @ top left...

That's also the problem, there are no stickers on it, no information at all.
all it say's is J*sti electronic professional power supply
as I don't have the unit with atm, I cant remember what the * was
if I remember right it's Justi/Jesti/Jasti

You probably can't up the voltage by much.

If you measure the input to the To-3 on the heatsink your maximum output would be that minus about 1.25 volts.

what would be needed to up the voltage?
I'll check on the To-3 ASAP

[mariushm]

Re: DC PSU output?

The gauges are most often universal ones, produced in mass quantity - it's not guaranteed the unit is able to achieve the maximum listed on them.

I would say a good indication of the maximum voltage would be the voltage of the transformer - if it's just 12-15v, chances are the power supply won't do more than that.

It doesn't seem to be a very complex design...also both the transformer and the heatsinks aren't that big so I wouldn't be surprised it can't do a lot.

[PCBONEZ]

Re: DC PSU output?

Josti Electronics.
German company that used to make kits like Heathkit.
They also made something like Pong games, or parts for them maybe.
They still exist but they only make model train stiff now.
.
Note logo at top of page.... Same as the logo on your PSU...
http://translate.googleusercontent.c...5epyUwKfY-adXg
.
Drop them an email.
Maybe they have old data sheets lost in the old file cabinet... [So to speak..]
Or maybe the guy that designed it is still around...
.

[playman]

Re: DC PSU output?

Josti Electronics.
German company that used to make kits like Heathkit.
They also made something like Pong games, or parts for them maybe.
They still exist but they only make model train stiff now.
.
Note logo at top of page.... Same as the logo on your PSU...
http://translate.googleusercontent.c...5epyUwKfY-adXg
.
Drop them an email.
Maybe they have old data sheets lost in the old file cabinet... [So to speak..]
Or maybe the guy that designed it is still around...
.

Awesome man, thank you very much.
I've mailed them and just hoping that they will reply back.
on the side note, I believe they are Danish not German

[PCBONEZ]

Re: DC PSU output?

Dunno. Some of the old URLs I came across were ".de"
".de" is German and I didn't notice it changed to ".dk" on their present site.
Looking back it looks like a bunch of there re-pop pong parts are sold out of German.
.
[Someone still makes Pong parts.... Who Knew??]
.

[playman]

Re: DC PSU output?

If you measure the input to the To-3 on the heatsink your maximum output would be that minus about 1.25 volts.

I just checked it, and it gave me 0.51v at max output and 0.43 at lowest output. I thought that I would be getting about the 14v output, or am I doing something wrong? (I messured on the the pins of the To-3)

[playman]

Re: DC PSU output?

no one?

[999999999]

Re: DC PSU output?

^ Measure between each pin and ground.

You'll have to map out the circuit and determine voltage limits of things like the transistor and capacitors, and current handled by the other parts on the PCB to determine if you can increase voltage. Next swap any limiting parts plus the transformer.

Frankly I think it would be better to just abandon everything in it. Start with a new transformer, bridge rectifier & capacitors, then a typical LM317 circuit w/transistor added for more current if needed. You can then put a bigger heatsink on too, as well as it being cleaner output. Oh, the potentiometer may need replaced with one having a suitable range for setting the LM317's output, or it may not.