TDA 1514A not holding its own

RIC · 19th December 2003, 05:12 PM

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.

carlosfm · 19th December 2003, 05:36 PM

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!!!!

ronc · 19th December 2003, 05:55 PM

datasheets, calculators and DVOMs.
ron

GUILHERME · 19th December 2003, 06:01 PM

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.

RIC · 19th December 2003, 06:13 PM

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.

ronc · 19th December 2003, 07:00 PM

Unless there is some sort of voltage reg in the power lead path.Exam LM317 and LM337?
ron

ronc · 19th December 2003, 07:04 PM

Or just use 2 12V batteries for P/S , it gives you +/- 12Vdc and provides for a much much cleaner signal.
ron

RIC · 19th December 2003, 07:15 PM

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?

jean-paul · 19th December 2003, 07:40 PM

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....

ronc · 19th December 2003, 08:09 PM

Very true, i keep thinking audio not guitar.Yea gotta have that ragged sound.
ron

19th December 2003, 05:12 PM	#1
RIC diyAudio Member Join Date: Dec 2003 Location: Woodward, Oklahoma	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.

19th December 2003, 05:36 PM	#2
carlosfm Banned Join Date: Mar 2003 Location: Lisbon, Portugal	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!!!!

19th December 2003, 05:55 PM	#3
ronc diyAudio Member Join Date: Mar 2003	^ why they make...... datasheets, calculators and DVOMs. ron

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19th December 2003, 06:13 PM	#5
RIC diyAudio Member Join Date: Dec 2003 Location: Woodward, Oklahoma	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.

19th December 2003, 07:00 PM	#6
ronc diyAudio Member Join Date: Mar 2003	Unless there is some sort of voltage reg in the power lead path.Exam LM317 and LM337? ron

19th December 2003, 07:04 PM	#7
ronc diyAudio Member Join Date: Mar 2003	Or just use 2 12V batteries for P/S , it gives you +/- 12Vdc and provides for a much much cleaner signal. ron

19th December 2003, 07:15 PM	#8
RIC diyAudio Member Join Date: Dec 2003 Location: Woodward, Oklahoma	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?

19th December 2003, 08:09 PM	#10
ronc diyAudio Member Join Date: Mar 2003	Very true, i keep thinking audio not guitar.Yea gotta have that ragged sound. ron

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