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Old 27th December 2012, 05:33 PM   #41
ceteras is offline ceteras  Romania
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I've found a local shop that has 3 pieces. I wonder where they've got them from.
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Old 27th December 2012, 06:25 PM   #42
jaycee is offline jaycee  United Kingdom
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Probably just old stock. The only place I can now find upc1237 is on eBay, and that is a gamble.

There's a potential for a nice little project here I think - a upc1237 replacement board
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Old 27th December 2012, 06:46 PM   #43
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I bought UPC1237HA from a local store in Mumbai for like 1$/pcs, if anybody wants it - can PM me. About quality/genuine, I've been using it for about 2 months or so & they seem to work perfectly.
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Old 27th December 2012, 06:52 PM   #44
ceteras is offline ceteras  Romania
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Quote:
Originally Posted by jaycee View Post
a upc1237 replacement board
That is exactly what I will do if the parts at the shop will fail.
I would use the circuits from Rod Elliot's project here as inspiration.
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Old 3rd January 2013, 04:09 PM   #45
ceteras is offline ceteras  Romania
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No luck with the C1237HA, it was money sent down the drain.
In my application, the Vcc is 20V, and all four pins no. 4,6,7,8 are at the same voltage: 20V.
It's just like I didn't solder the chip on the board, and I've triple checked everything.
I will try an original uPC1237 from an Akai amplifier just to verify if the circuit is allright. If it works, I'm going to start designing the replacement board for this chip.
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Old 3rd January 2013, 06:12 PM   #46
ceteras is offline ceteras  Romania
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Update: uPC1237 from the Akai amplifier works like a charm.
So I know not to buy anything else from that shop, perhaps except resistors.
I'll finish my project with this chip, and think about the replacement board after that.
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Old 3rd January 2013, 06:21 PM   #47
Bill_P is offline Bill_P  United States
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NAD has designed a small board to replace the uPC1237. See this thread for details: NAD C315BEE - Help with repair!
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Old 8th January 2013, 02:52 PM   #48
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Quote:
Originally Posted by Bill_P View Post
NAD has designed a small board to replace the uPC1237. See this thread for details: NAD C315BEE - Help with repair!
I've NAD C352 amp(Manufactured -Oct 2004) & it uses UPC1237 . It uses standard value passives as mentioned in UPC datasheet.
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Old 8th January 2013, 02:56 PM   #49
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Quote:
Originally Posted by ceteras View Post
No luck with the C1237HA, it was money sent down the drain.
In my application, the Vcc is 20V, and all four pins no. 4,6,7,8 are at the same voltage: 20V.
It's just like I didn't solder the chip on the board, and I've triple checked everything.
I will try an original uPC1237 from an Akai amplifier just to verify if the circuit is allright. If it works, I'm going to start designing the replacement board for this chip.
Yeah we poor DIYers are sitting ducks for these counterfeiters. Keep us posted about your results with the original uPC1237 from Akai.
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Old 8th January 2013, 03:10 PM   #50
ceteras is offline ceteras  Romania
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Originally Posted by availlyrics View Post
Yeah we poor DIYers are sitting ducks for these counterfeiters. Keep us posted about your results with the original uPC1237 from Akai.
Excuse my poor English , but I've written about it a couple of posts above. It works fine with the good old NEC uPC1237 from the Akai.
I've tried to crack open the counterfeited chip, hoping to prove that there is no silicon inside (that's what I expect).
Unfortunately I've broken it in too many pieces.
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