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Owon ODP6033 triple power supply teardown

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modoran:
So this is the teardown of the Owon ODP series power supply ( ODP6033 ).

Rear board contains USB, RS232 and LAN connectivity . It uses Wizznet W5500 chip and Sipex SP202EEN for Rs232 to TTL.




The front panel board contains 2 of them sandwitch together:


Binding posts are soldered directly to the PCB itself.

Current shunts are a bit to close to exposed traces, don't like that.


Main processor inside the unit is a Samsung S3C2416XH-40, RAM is a DDR2 SkHynix H5PS5162GFR-S6C part, and NAND is a Micron 1Gb 29f1g08abaea part.

LCD module is an GA4024-IVO which I couldn't find any info on the internet. If it malfunctions this could be unobtanium.

Keyboard is standard rubber keys, encoder does not have any series on it to be easy identified.


modoran:
Continued as this forum does not allow many pictures ...




Main power transistors is ISC branded NJW0281, total 9 of them, 7 on one side of heatsink and 2 on other side. There is 3 pcs TIP42C and 3 main bridge rectifiers on the same heatsink, along with a transistor as temperature sensor ( don't read the part number, could be something else, not a transistor ) in a TO92 package.

There are 2 toroidal transformers with 3 voltage taps.  I measured 85V DC at the unregulated output which seems a bit too high at the supply delivers only 60V.


There are many OP17 opamps in there and 3 pcs Silicon Labs C8051F350 microcontrollers ( one for each channel ).

Output capacitance on 2 main channels is 100 uF.


Swake:
Hi Modoran,

Thanks for the pics. While looking for an additional power supply (can never have enough) I stumbled upon your post here and it reminds me of Jerry Walker's video on the same power supply family.


Why would 85V DC be on the high side? I've seen other supplies that have up to twice the output voltage before regulation. Got to build a buffer somehow.

John B:
85V would be the unloaded voltage? They can use less capacitance that way, the RMS voltage being dropped across the regulator would be far lower under load.

modoran:
Yes, 85V unloaded voltage, it uses 4700uF caps.   

Don't know how much it drops under load.

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