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Old 2nd May 2014, 10:45 PM   #351
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Location: Jackson,michigan
I just found this for those of you whom keep asking about using more output devices,

Amplificator cu TDA7294 si tranzistori | RoElectronica

I had covered those type of questions in a very early post in this thread.
I have not been able to get any of the output devices used as of yet so I have not tried this design, But I do plan to sometime in the future.

Cheers!!

jer
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Old 3rd May 2014, 09:53 AM   #352
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geraldfryjr i actually think that is one of the designs i stated out with a LONG time ago, but sounded like crap due to missing "sync" resistor
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Old 3rd May 2014, 10:29 AM   #353
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Yes, I noticed that the resistor was missing!!!?

Hmmmm...............

jer
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Old 16th June 2014, 12:29 AM   #354
JaanusJ is online now JaanusJ  Estonia
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Bumping this thread, cause my amp kicked out some flames. I'm thinking lack of cooling to be the cause.
Anyway, new amp is almost ready.
But I have an idea of mounting the transistors on a separate radiator. Using actually 3 radiators in total, 1 for the chips and 1 for each transistor pair.
I do like to make things interesting, so will 2 of these be any good for the transistors?
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Oh and is it still okay to mount the transistors away from the board using wires?
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Old 16th June 2014, 07:13 AM   #355
AndrewT is offline AndrewT  Scotland
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I'm surprised it survived until the middle of June !
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regards Andrew T.
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Old 16th June 2014, 04:22 PM   #356
JaanusJ is online now JaanusJ  Estonia
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Well tbh, it did break a while ago. But thats all part of the diy process, I'm not worried, i like soldering
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Old 17th June 2014, 08:32 AM   #357
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I've used a 30-0-30vac transformer and maintained an 8 ohm load and I have no problems, coz remember its a bridged amp and its already driving close to its maximum power, so if you increase load the more strain you're adding, more heat dissipation, so whatever load you add, maintain 8 ohms.if u want to drive more speakers try series- parallel connections
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Old 19th June 2014, 02:10 PM   #358
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hi guys, is there anyone with a good midrange amp schematic and PCB layout?
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Old 28th June 2014, 01:26 PM   #359
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can someone tell me the heatsinks characteristics of the tda7294 and the two transistors ( 2sa1943 & 2sc5200) thanks a lot..
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Old 3rd July 2014, 01:58 AM   #360
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The 6,8 Ohm implies that the slew rate of the chipamp becomes critical. The chipamp only delivers around 100 mA output (makes 0,7 V over BE of the boost transistors).
It would be better if the Chaipamp delivers half its capacity, thus 3A. When assuming Ube = 0,7 V this implies that the R = 3/7 Ohm = 0,3 Ohm. If you use 0,5 Ohm, the chipamp will deliver 1,4 A and the boosters do the rest. This implies far less cross over distortion. I would like sombody test and measure the distorion.....
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