TDA 1514A not holding its own - diyAudio
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Old 19th December 2003, 04:12 PM   #1
RIC is offline RIC  United States
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Default TDA 1514A not holding its own

Hi. everyone. I'm new here. I have a problem with an Trace Elliot SuperTramp twin stereo chorus, guitar amp, blowing / exploding
the TDA 1514A chips. I cant get any Tech support, schematic's
or such. these blow after jaming hard for 20min's or so, at a vol..
of 6 to 8. think the heatsinks maybe to small,? a bad designed output modual,? any id? Power Tran is 25 0 25 at 1.1amp
RMS is 2x40, 2x55 peak at 4ohm's. Would even like to mod
the output's if some on here could give me some dirrection to go.
This amp was made back in july of 1995 if any one has schem's
T.Lelliot made differant ver. of these amp's with out the TDA 1514A.
Thanks
Glad I found this place, have some other project's I mite get off the ground now.
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Old 19th December 2003, 04:36 PM   #2
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Lightbulb The transformer

On the TDA1514A datasheet:
Supply voltage range: +/- 10v to +/- 30v.

Your transformer (25-0-25):
After bridge and caps (25+1.414) = +/- 35.35v

BAAAAANG!!!!
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Old 19th December 2003, 04:55 PM   #3
ronc is offline ronc  United States
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Default ^ why they make......

datasheets, calculators and DVOMs.
ron
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Old 19th December 2003, 05:01 PM   #4
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Default typo

Quote:
Originally posted by carlosfm

After bridge and caps (25+1.414) = +/- 35.35v
You meant 25 * 1.414

(just so RIC understands you better).

Guilherme.
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Old 19th December 2003, 05:13 PM   #5
RIC is offline RIC  United States
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So I take it Trace Elliot has a bad design? the power supply to the preamp / FX . come's off the TDA 1514A board, and shows,+35 -35, and ground, mute and signal of course.

what would be a good fix.
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Old 19th December 2003, 06:00 PM   #6
ronc is offline ronc  United States
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Unless there is some sort of voltage reg in the power lead path.Exam LM317 and LM337?
ron
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Old 19th December 2003, 06:04 PM   #7
ronc is offline ronc  United States
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Or just use 2 12V batteries for P/S , it gives you +/- 12Vdc and provides for a much much cleaner signal.
ron
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Old 19th December 2003, 06:15 PM   #8
RIC is offline RIC  United States
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As in car batteries? ha.. Their's are no voltage reg's.
just trans-bridge-caps, ect...
This amp was manufacture in july of 95, think thay mite of learn something over the years?
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Old 19th December 2003, 06:40 PM   #9
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Quote:
Originally posted by ron clarke
Or just use 2 12V batteries for P/S , it gives you +/- 12Vdc and provides for a much much cleaner signal.
ron

The question is if RIC wants a cleaner signal for his guitar amp !

+/- 35 V is too much for the 1514, maybe you can hack in a pair of LM3875 ??

BTW isn't it *might* instead of *mite* ?? Just to know if I learnt english the right way....
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Old 19th December 2003, 07:09 PM   #10
ronc is offline ronc  United States
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Very true, i keep thinking audio not guitar.Yea gotta have that ragged sound.
ron
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