Point 2 Point (no PCB) for TDA7293, TDA7294, TDA7295, TDA7296. - Page 14 - diyAudio
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Old 30th May 2013, 07:04 PM   #131
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Cool intermediate

this is what ihave
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Last edited by martin martinez; 30th May 2013 at 07:17 PM. Reason: atachments
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Old 30th May 2013, 07:19 PM   #132
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i´ll use the boards connections, and wire jumpers over and under
board as well as P2P
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Old 3rd June 2013, 08:31 AM   #133
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Default more

this one for testing. No place 4 the caps!
small Power Supply.
pointo pointed...
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Last edited by martin martinez; 3rd June 2013 at 08:33 AM.
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Old 29th June 2013, 07:02 AM   #134
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Default bad

dead suspect of a fAKE!
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Old 29th June 2013, 07:08 AM   #135
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the boards on post 131 are waiting confirmation, they´re crowded and yet more parts
tobe soldered. Anyway will finish if the chips turn tobe good not like the other pair.
Still have one p2p 7293 needto check again and test, also the parallel duo.
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Old 4th July 2013, 08:10 AM   #136
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Quote:
Originally Posted by martin martinez View Post
dead suspect of a fAKE!
Little table radios using that "fake" (re-mark) chip usually cost in the range from $50 to $380, depending on the skill of the marketeers. When it is re-marked to TDA7294, identification is practically impossible because the IC chip package is the same. An adequate defense seems to be to start up the amp with the Light Bulb Test and also a 12+12vac transformer. If it works at the low voltage, but not at the high voltage, then you've identified it.
For this reason, I prefer the TDA7293 chips, and see if the clip indicator pin works, which it tends to do on authentic chips.
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Old 4th July 2013, 04:51 PM   #137
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Hi Daniel W! thanks.
then its better to try on low volts...
Please explain:
how would i know if #5 pin is working?
is it capable to drive a led?
I think the datasheet doesn´t show.
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Old 4th July 2013, 05:26 PM   #138
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The one that blew just made atiny snap, and a little
magic smoke got out.
Maybe +-35V was too much.
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Old 5th July 2013, 10:45 AM   #139
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Well I don't know if TDA7294S/TDA7293 could drive an LED from pin5--I just drove an old analog voltmeter with it, temporarily to see if the expected circuits existed inside the chip.
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Old 6th July 2013, 02:04 AM   #140
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what did the analog meter do when atached to pin 5?
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