Point 2 Point (no PCB) for TDA7293, TDA7294, TDA7295, TDA7296. - Page 10 - diyAudio
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Old 6th March 2013, 01:11 AM   #91
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I have to report that the discharge imbalance has started again..I might be having some defective parts.Daniel do you have any other good dual secondary psu schematic?
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Old 12th March 2013, 12:14 AM   #92
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Sorry, I don't have any power supply designs made for using bad caps, so just simply replace any defective parts.

But I do have some questions:
Did you add adjustable snubbers to the secondaries like we discussed previously?
Do you have alloy transformer hookup cables from transformer to bridge rectifier?
Do you have the bridge rectifiers on the power supply board, per the schematic?
How much voltage discrepancy in the DC power?
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Last edited by danielwritesbac; 12th March 2013 at 12:19 AM.
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Old 12th March 2013, 04:31 PM   #93
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It's happening with load.The left speaker has a bit lengthy wire ,,so it has some unequal load resistance from right speakers.
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Old 13th March 2013, 12:15 AM   #94
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Transformer or bridge rectifiers.
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Old 17th April 2013, 05:16 PM   #95
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Location: uruapan, michoacan, mexico
hey mr daniel!
im building a 7293 in bridge config.,
as by the 7294 bridge mode, but using your
rc values; my question is: the resistor from
IC1 out to IC2 neg in, should be 60k too?
the transformer is a 25-0-25 125VA
and 4700uFx4 any comments?
thanks for your postings and your time
and attention.

martinnez martin
uruapan michoacan

forgot to say its going to replace burnt amp
and ps board from an amplified speaker.

Last edited by martin martinez; 17th April 2013 at 05:34 PM. Reason: more info on requested theme
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Old 18th April 2013, 07:20 AM   #96
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Hi Martin,
Quote:
Originally Posted by martin martinez View Post
hey mr daniel! im building a 7293 in bridge config., as by the 7294 bridge mode, but using your rc values; my question is: the resistor from IC1 out to IC2 neg in, should be 60k too?
Yes, a "bridge resistor" is same value as your feedback resistors. The simple bridge method works okay for making a guitar amplifier.


However, you could have a look at the OP275 datasheet, find +15v and -15v regulators, and then try a high quality bridge adapter:
Click the image to open in full size.
Quote:
Originally Posted by martin martinez View Post
the transformer is a 25-0-25 125VA. . .
I'm currently building a power supply that could help this. I was almost done, but the soldering iron quit working.
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Old 18th April 2013, 05:58 PM   #97
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Location: uruapan, michoacan, mexico
Default thanks!

i have a little doubt: my xfrmer is from another amplified spkr,
25-0-25 i have dual bridge rectifiers and 4x4700uf. it was used
with single rectifier and 15000 x2 caps to feed 2 lm3886 bridge
for lo freq and another 3886 for hi freq.
Since i want to use fullrange amp for 8 ohms spkr wpassive xover,
what doyou recomend with that ps?
Its 25-0-25 125va dual rect and 4x4700...
My doubt is about what would fit better either single or bridge
3886 or 7293; any sugestions?
thank you very much
for your reply
martin martinnez
uruapan michoacan
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Old 18th April 2013, 06:14 PM   #98
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Location: uruapan, michoacan, mexico
Default ic substitution?

Quote:
Originally Posted by danielwritesbac View Post
Hi Martin,

OP275 datasheet, high quality bridge adapter:
Click the image to open in full size.

.


can use ne5532 more easily available here, or another choice?
so that way of bridgin with the feedback res its not so good?
Then i have to use opamp brdge adapter?

this speaker has integrated mic line pre,eq and usb-card mp3player
then i can use gain 29x?
ill change my res and caps for feedback
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Old 18th April 2013, 06:20 PM   #99
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excuse me if to much posting;
what is your time zone, so ill
try to not bug much at wrong times
or right times either!
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Old 18th April 2013, 06:29 PM   #100
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See also Rod Elliot's site, and alternative schematic with TL072. Bridging Adapter For Power Amps
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