Author Topic: Replacing Chip in watson 10-am PSU  (Read 342 times)

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Offline Sel

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Replacing Chip in watson 10-am PSU
« on: May 07, 2018, 12:30:31 pm »
I while back I bought second hand Watson PSU and it's been fine until Yesterday.
When I first turned it on with nothing connected to terminals it came on with a loud click but seemed to work fine.
I used it for an hour or two  only a few seconds at a time with very low load and no shorts.

Later when I tried to run a small motor there was a little crackle and smoke came out of the psu.
Opened it up and noticed that the NEC C324C chip was sparking if I pushed on one of the legs. It is burnt at the chip not a dry joint to the board.
Now the PSU still work but I have no voltage control it's stuck at max 20volts (rec 13.5)  but reads zero on the meter, the  Amps read as normal 0-20.

There's no other obvious fault, when checking the NEC C324C chip online it tells me it's a Quad op Amp.
Do I have to replace it with an exact match or could I use a  LM324 DIP-14 as these are a little cheaper and easier to get?

Any help please.


 
 

Offline Samogon

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Re: Replacing Chip in watson 10-am PSU
« Reply #1 on: May 07, 2018, 04:36:29 pm »
Cheaper than 40 cents? Shipment would be 3-5$
 

Online wraper

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Re: Replacing Chip in watson 10-am PSU
« Reply #2 on: May 07, 2018, 05:01:55 pm »
There is no need to get particularly uPC324 and you can use LM324 as uPC324 is just a yet another flavor of LM324. It does not have LM letters as most other 324 only because NEC used uPC for their analog ICs and uPD for digital.
 

Offline Sel

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Re: Replacing Chip in watson 10-am PSU
« Reply #3 on: May 07, 2018, 11:04:40 pm »
Excellent thanks for the information, I just wasn't sure.
 


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