Teardown DAZHENG PS-1501T

[hacklordsniper]

While checking the flea market i noticed this little power supply. The cable was cut away meaning its surely dead, but knowing it will be simple to fix and having a price smaller than a pack of candies i just had to buy it.

In comparision to a other power supply which does the same it is very big. But inside there is very little with many unused mounting holes so i believe they make them in different flavors 
The 2N3055 blew so i added a "real" heatsink behind.

The biggest problem was it was very, very dirty! I spent about 1/4 L of alcohol to clean it. It was covered in cigarette tar and grease and various other unknown icky-sticky stuff. Now its clean and works nicely.

[saturation]

Nice restoration job, the design reminds me of just emerging from or Mao dominated China era technology.  What kind of regulation do you get from it?

[hacklordsniper]

Nice restoration job, the design reminds me of just emerging from or Mao dominated China era technology.  What kind of regulation do you get from it?

Its possible to regulate only the voltage 0-15.5 V and the current is internally limited to 1 A before the relay disconnects the output. However it would be easily modified for adjustable current limiting.

What worries me that i  will need to ditch this power supply. The smell of "old ashtray" coming from this unit is so bad it stinks my lab and my house.

Any advices how to get rid of that smell? I washed throughly with 99 % alcohol the unit and removed all tar

[saturation]

If it still smells after all your cleaning it may mean the tar/nicotine is stuck to the PCB, and coating the components too, washing the PCB is much work.  Instead of throwing it out, you can salvage parts for your future projects, they are also easier to clean thoroughly.  Tar & nicotine are organic, and can be washed out with isopropyl alcohol, just desolder what you need, then soak them all in a bucket of alcohol.

Nice restoration job, the design reminds me of just emerging from or Mao dominated China era technology.  What kind of regulation do you get from it?

Its possible to regulate only the voltage 0-15.5 V and the current is internally limited to 1 A before the relay disconnects the output. However it would be easily modified for adjustable current limiting.

What worries me that i  will need to ditch this power supply. The smell of "old ashtray" coming from this unit is so bad it stinks my lab and my house.

Any advices how to get rid of that smell? I washed throughly with 99 % alcohol the unit and removed all tar