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Old 25th February 2013, 07:30 PM   #1
Liliya is offline Liliya  Norway
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Default Adapt 14 pins into 8 pins

I want to replace the IC TBA231 with OPA2134. TBA 231 is mounted in a 14 pins holder, while OPA 2134 stop at 8. Does there exist a adapter that convert from 14 to 8 pins?? If so, where can I get in?

Other good suggestions will be received with thanks.

Eivind Stillingen
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Old 25th February 2013, 07:33 PM   #2
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Difficult to talk about an adapter without giving the datasheets or at least the pinouts of the two ICs.

With one being 8pin and the other 14pin, I would doubt they are made to do the same job without more circuit modifications.

Greetings,
Andreas
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Old 25th February 2013, 08:55 PM   #3
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I'm just Mr. Cut-n-Paste these days ... I learned how to use Paint!
TBA231:
TBA231 pinout schematic.png

TBA231.pdf

It will depend on how your circuit uses pins 2, 3, 4, and 10, 11, 12 of the TBA231.
This probably won't be an easy swap ...

Last edited by AudioLapDance; 25th February 2013 at 09:03 PM.
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Old 25th February 2013, 09:09 PM   #4
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Apart from the compatibility issue, one of those socket whatevers, a piece of perfboard and a plain 8pin socket would do...

Andreas
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Old 25th February 2013, 09:30 PM   #5
JMFahey is offline JMFahey  Argentina
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Quote:
Originally Posted by Liliya View Post
I want to replace the IC TBA231 with OPA2134. TBA 231 is mounted in a 14 pins holder, while OPA 2134 stop at 8. Does there exist a adapter that convert from 14 to 8 pins?? If so, where can I get in?

Other good suggestions will be received with thanks.

Eivind Stillingen
1) why?
2) what do you expect to achieve?
3) post the schematic where you intend to replace it
4) in a nutshell, you can not pull a TBA231 and plug a different one in there, even if you had a proper "pin rerouting" socket .
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Old 25th February 2013, 11:17 PM   #6
Liliya is offline Liliya  Norway
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Back in the 70's I built a Sentec SE77 preamplifier (Swedish). This was one of my very first DIY projects. Since then, there have been many more. This preamplifier had as many others, to give way to new and more interesting projects later on, and has since been stored in my garage. As part of a larger “clearing projects” in older DIY projects, I brushed the dust of this preamplifier. To update SE77, I have been inspired by this: http://www.svalander.se/tips_fakta/h...iering_sentec/
Sorry that this is only written in Swedish, which is a easy thing for us Norwegians to understand.
I have, after I asked my question on this site, sat down for to maybe find a workable solution. See attached photo where I have made a "test" on a veroboard and with a NE555.
Since there is no more modern subsitutes for a 14 pin TDA231, I want to go for OPA 2134
Comments are welcome.
Attached Images
File Type: jpg DSCF0812.JPG (69.9 KB, 29 views)
File Type: jpg DSCF0813.JPG (58.5 KB, 29 views)
File Type: jpg DSCF0814.JPG (63.5 KB, 29 views)
File Type: jpg DSCF0815.JPG (92.0 KB, 30 views)
File Type: jpg DSCF0816.JPG (80.9 KB, 29 views)
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Old 26th February 2013, 09:12 AM   #7
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To be honest, the 'test' looks a bit crude to me

I think I wouldn't solder directly to the pins of the replacement opamp, but use a socket for it instead. Use a 14pin socket adapter as shown above, reroute the needed pins on a small piece of veroboard and put a 7pin socket adapter on it for the new chip.

More difficult, but probably will look nicer and work more reliable in the end.

Regards,
Andreas
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Old 27th February 2013, 08:08 AM   #8
Liliya is offline Liliya  Norway
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A better solution was found: I took away the 14 pins IC holder. Blank wires to OPA 2134 from both sides of SE77 PCB. More "elegant" then my first attempt.
This works very, well and with a much better sound then TDA 231.

Eivind Stillingen
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