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Old 28th April 2013, 09:50 PM   #51
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Join Date: Feb 2010
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.
On the NEC PC1237 datasheet it states that the chip works with a supply voltage from 25-60Volts. As you are using it at 20v I suspect that has more to do with problems your are encountering than counterfeit chips. I am bemused as to why anyone would bother to fake a 1 chip.
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Old 29th April 2013, 05:51 AM   #52
diyAudio Member
Join Date: Apr 2010
Location: Coffs Harbour, on the east coast
Originally Posted by Rickshaw View Post
......I am bemused as to why anyone would bother to fake a 1 chip.
Indeed, but they even fake T092 transistors for how much profit? Member Ilimzn has given us an idea of the reasons behind the proliferation and the different types of fakes from the many Chinese fabs now also churning out our genuine popular semis too.

Let's just say it's can be a "creative" way to dispose of and get some return on substandard products that would formerly have been destroyed. Why do we shop at their known outlets for unobtanium products, begging for fakes and then complain about getting them? To me, that is the real bemusement.
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