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Old 10th May 2008, 07:58 PM   #31
jan.didden is offline jan.didden  Europe
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Default Re: Hi!

Originally posted by zeonrider
@janneman, Put schematic if you have!?

Regards zeoN_Rider

I'm sorry, I can't freely post the schematic but the complete article is downloadable for 1.20 euro from here:


Jan Didden
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Old 10th May 2008, 11:18 PM   #32
paulb is offline paulb  Canada
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Here's the schematic from the UPC1237 datasheet.
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File Type: gif upc1237-cct.gif (26.3 KB, 1860 views)
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Old 4th April 2010, 03:56 AM   #33
thoixavangleluu is offline thoixavangleluu
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thank you. I need schemas for uPC1237.
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Old 12th February 2011, 05:50 AM   #34
ziaulislam is offline ziaulislam  Pakistan
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Old 7th May 2012, 04:36 AM   #35
joaquin horacio is offline joaquin horacio
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Hola a todos; Por favor si alguien tiene el diagrama interno y un circuito de aplicacion con el upc1237H .
Estoy reparando un Amplificador sansui A-1001 si alguien tiene el circuito seria grandioso.
Desde ya mucchas gracias.
joaquin horacio

Hello everyone, Please if anyone has the internal diagram and application circuit with upc1237H.
I'm repairing a sansui amplifier A-1001 if anyone has the circuit would be great.
From mucchas and thanks.
joaquin horacio

Last edited by wintermute; 7th May 2012 at 04:41 AM. Reason: added translation from google translate
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Old 7th May 2012, 04:43 AM   #36
wintermute is online now wintermute  Australia
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Joaquin, this is an english speaking forum. Please provide an English translation if you post in Spanish.

Joaquín, este es un foro de habla Inglés. Por favor proporcione una traducción al Inglés si usted publica en español.
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Old 7th May 2012, 06:50 AM   #37
Bksabath is offline Bksabath  United Kingdom
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I have been using the NTE7100 since last August
So far my speakers have survived a lot of tinkering with MY F5
The SCH I use is similar to the one in post 32
Only thing you may want to consider is same relays designed on purpose for the job.
They must be DC rated as the AC rating of the contacts is meaningless
This is what I use
Loudspeaker relay - toroidal-transformer.com
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Old 9th May 2012, 03:49 AM   #38
joaquin horacio is offline joaquin horacio
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Hi all, I'm repairing an amplifier Sansui A-1001 does anyone have the circuit diagram?.
The source has the upc1237H and was offered the upc127HA is it the same?.

Thank you very much for your help.
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Old 27th December 2012, 02:52 PM   #39
ceteras is offline ceteras  Romania
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I know this was a long time ago...

Originally Posted by jan.didden View Post
So, let me get this straight then. Because you fear that 10 years from now there is a chance you can't get a uPC1237, you think it is *better* to built a circuit from discretes today?

That's Ok, but I just thought you really meant *better* in terms of performance.

Jan Didden
... but here we are 4 years later, and I can't find this chip at the two distributors I usually buy from: Farnell and TME.
I had one CA1237HA in a project, it died, now I can't find another one.
I'll try to replace it with a discrete transistor based circuit.

I'm sure I can find lots of them on ebay, but most of them are fake/poor_quality just like the one that died.

Last edited by ceteras; 27th December 2012 at 02:54 PM. Reason: Forgot to say something.
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Old 27th December 2012, 03:39 PM   #40
paulb is offline paulb  Canada
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Mouser Electronics (North America) have a few NTE7100 left - a direct replacement.
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