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Old 6th May 2013, 11:43 PM   #81
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Join Date: Feb 2012
the VA can be anything, hard to say

40-0-40 is pushing it, if you have an extra 7293 with transistors i suggest you use 1x to test if the 55-56V DC is not to much.
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Old 13th May 2013, 08:43 PM   #82
kebbz is offline kebbz  Serbia
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Join Date: Dec 2012
Location: Subotica
Hey people, this is my version of this amp. It's two of these modules bridged in a way that second TDA module pin 3 (signal+) is connected ground and the input is taken from the output of the first module via 22k resistor and going to pin 2 of the second module (signal-). Its tested and its working fine. If you need PCB layout or any info please msg me, the PCB is made in program "Sprint Layout ver5"
Click the image to open in full size.
Click the image to open in full size.
Click the image to open in full size.

Last edited by kebbz; 13th May 2013 at 08:54 PM.
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Old 14th May 2013, 10:53 PM   #83
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Join Date: Jun 2004
Location: uruapan, michoacan, mexico
hey! it looks very cool.
have you measured something?
I understand its soundin g ok,
what load doyou have, and with
which power supply?

Really nice and pro looking.
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Old 14th May 2013, 11:06 PM   #84
kebbz is offline kebbz  Serbia
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Join Date: Dec 2012
Location: Subotica
Quote:
Originally Posted by martin martinez View Post
hey! it looks very cool.
have you measured something?
I understand its soundin g ok,
what load doyou have, and with
which power supply?

Really nice and pro looking.
Hi and thanks. This is just a first pcb I made for testing and it worked great on first start. Still did not measured anything, but I'm wondering if this method would give some close measurements, if I put a 50Hz signal, then measure the voltage and the current that goes to the speaker and just multiply....
I have a car subwoofer 400W nominal and 1400W peak 2 x 4 ohm coils, on 4 ohms and with 300VA toroidal transformer 30-0-30V this amp shakes the roof on my garage . I will try the 36-0-36V, that would give +-50V DC but its also 300VA, I have to get a larger transformator to test it completely. The sound is very clear, did not had any problems adjusting the 6.8 ohm resistor.
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Old 15th May 2013, 11:26 PM   #85
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Join Date: Jun 2004
Location: uruapan, michoacan, mexico
Good! Right now im on a bridged 7293,
and will follow parallel 7293, both p2p,
then iŽll go for this one!
thanks.
martinnez
uruapan michoacan
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Old 16th May 2013, 10:14 AM   #86
kebbz is offline kebbz  Serbia
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Join Date: Dec 2012
Location: Subotica
Well, thats exactly what I built before this one. Two modules with TDA7293 in Master-Slave so they can push more current and then those two bridged. That should give 400 watts into 4 ohms, and the sound is amazingly clear, no hum at all. I built a mainboard with the power supply and modules can be inserted onto it, there is a place for preamp with Bass-Treble regulation. Here's a pic, If ya need any help just ask
Click the image to open in full size.
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Old 17th May 2013, 03:11 AM   #87
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Join Date: Jun 2004
Location: uruapan, michoacan, mexico
WOW!!!
thatŽs some chipamp!
and nice boards.
IŽll use my bridged for an
8 ohm speaker with tweeter
(passive filter) and the parallel
amp for a microfone mixer with
a 4ohm load and a 30-0-30 xfrmr
and 8x2200 uf
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Old 17th May 2013, 09:03 PM   #88
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Join Date: Feb 2012
Nice work kebbz, and i can see that you can also confirm that this amp punches some REAL power, also you have the option of adding more Transistors like i posted.

I am however a bit disappointed in the "forum", i would have thought that someone would have replicated "my" amp (many others have made the design before me) much earlier than this, but i hope kebbz can do some measurements on it, i still haven't gotten around to it, i been making many other things over the years.

I will however make my 4x 7293 sometime in the next 6 months because i need it to finish my B&O project after i build my subwoofer to it, depending on if my normal 2x 7294 will work fine with some resistors on the speakers.

The current project:
http://www.facebook.com/media/set/?s...1&l=0b484a5e9d
NOTE: Don't need facebook account since it is public.
EDIT: Still using my "ATX" amp in the TV, did not add a picture of it inside in the album.

EDIT: and kebbz the amp is 2 Ohm stable, and will also drive 1 Ohm and lower if you limit volume , add 1 more set of Transistors and you should have 1 Ohm Stable and ALOT of power

Last edited by dr frost dk; 17th May 2013 at 09:18 PM.
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Old 17th May 2013, 10:52 PM   #89
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Join Date: May 2005
Location: Rotterdam Netherlands
Quote:
Originally Posted by dr frost dk View Post
I am however a bit disappointed in the "forum", i would have thought that someone would have replicated "my" amp (many others have made the design before me) much earlier than this,
I bought my TDA7294's in ~1999, bought some PCB's last year and some 2SC5200 and 2SA1946 last month. I'm picking up speed...

(The 7294's were for a failed high efficiency project with dual supply voltages).
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Old 17th May 2013, 11:49 PM   #90
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Join Date: Feb 2012
Quote:
Originally Posted by ric-paul View Post
I bought my TDA7294's in ~1999, bought some PCB's last year and some 2SC5200 and 2SA1946 last month. I'm picking up speed...

(The 7294's were for a failed high efficiency project with dual supply voltages).
Nice to see more, have you put it together then?
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