TDA7294 + Power Transistors AMP (TDA7293 to come also) - Page 3 - diyAudio
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Old 19th February 2012, 04:17 PM   #21
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Quote:
Originally Posted by Volperossa View Post
Ok im just .. lost now. I can find a picture were the TDA is visible ... but i cant see a schematic and because im very amature still ... i have no clue whats going on all of a sudden .. i only just noticed that the schematics i download of ya dont have instrustion on the TDA =/ ... i wouldent know were to move the feed back or ne thing .. i just assumed u had to attach the output to the input of the 2S board.

EDIT) Maybe i have found my confusion here but maybe not lol . on the main schimatic does the number like reprisent the TDA pins? or is that hole numbers? if so then i apologise for filling your thred! lol
Thats alright, and yes the NUMBERS represent the pins on the TDA7294/3, if you have seen the pictures of the "circuit"/hole print you can see that there are pins missing from the chip, those are the 5, 10, 11, i just bend them back and forth a few times and they break off

NOTE in TDA7293 pin 12 is in use so if you are making the TDA7293 then don't break off that pin.
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Old 19th February 2012, 05:33 PM   #22
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Thanks for that , total brain fart there lol.

So im assuming the powersuppy is also included directly on the circuit so i can just plug the transformer str8 to the board?

Just to let you know , im planning to use these to power the PA system im in the process of building i will be posting up full pictures of everything, including a redesign of the classic 18" Superscooper wich i have shrunk down to 8" versions for home use- sounds great
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Old 19th February 2012, 07:35 PM   #23
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Well the power-supply needs to be done also, you can throw 20-45V +/- directly on this AMP, a note on wiring thou, main power wires needs to be connected to the Transistors from here you don't need very thick wire going to the board after.

If you use a Ring-Transformer then remember to make the normal power things, A good Bridge Rectifier and some good caps, you should use a minimum 2x10,000uF (50V/63V), anything over will always be better.
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Old 19th February 2012, 07:47 PM   #24
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I found this diagram designed for the TDS but at 50w rms

Free Schematic Diagram at www.circuitdiagram.net

could i adjust this plan to get the output high enuf to get 300/400 watts out of the amp?
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Old 19th February 2012, 10:08 PM   #25
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Quote:
Originally Posted by Volperossa View Post
I found this diagram designed for the TDS but at 50w rms

Free Schematic Diagram at www.circuitdiagram.net

could i adjust this plan to get the output high enuf to get 300/400 watts out of the amp?
Thats a good diagram, just use a different transformer:
For 4-8Ohm using 300W (MAX) speakers use a 150VA 2x30V
For 2-4Ohm using 500W (MAX) speakers use a 300VA 2x30V
If you plan on using Dual Transistors and also bridge then you need a 500VA+ Transformer.
And the caps again have to be 50V or 63V, you can also omit the 2x 2.2K resistors and Diodes (last component set in the diagram)

Again the AMP is setup for 2-8Ohm LOAD, you have to change/experiment with another resistor then the 6.8Ohm for less then 2 Ohm, it will drive 1Ohm with no problems but there will be noise introduced if the Resistor is not changed.
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Old 19th February 2012, 11:28 PM   #26
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Awsome then thats me sorted =D

btw i can get from 30v to 55v all at the same price so if its worth getting higher let me know =)
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Old 19th February 2012, 11:41 PM   #27
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Originally Posted by Volperossa View Post
Awsome then thats me sorted =D

btw i can get from 30v to 55v all at the same price so if its worth getting higher let me know =)
if 30v to 55v is the AC rating (like 230V - 2x30V/300VA) then DO NOT go over 30V, the next AMP im making (TDA7293) will go higher but the TDA7294 will only take MAX 2x50V DC, again DC and if you take 30V AC and multiply it with 1.41 then you get 42,3V DC.

AGAIN DO NOT go beyond 30V AC, you will fry the TDA7294, there are ways to archive LIMIT VOLTAGE with an INPUT over 50V but from the latest post you are a bit of a noob so lets keep it simple and to the point.
Nothing wrong with being a noob, we all where at the beginning , and im glad to help where i can.
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Old 20th February 2012, 04:14 AM   #28
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Originally Posted by dr frost dk View Post
Nothing wrong with being a noob, we all where at the beginning , and im glad to help where i can.
Your damn right! lol
No one steps into a new task a pro =)

Thanks for that n wish me luck =D
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Old 20th February 2012, 04:42 AM   #29
Art M is offline Art M  United States
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Default Distortion

Correct me if I am wrong but there does not seem to be any Biasing of the output stage. The distortion must be pretty bad if measured.
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Old 20th February 2012, 05:34 AM   #30
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Originally Posted by Art M View Post
Correct me if I am wrong but there does not seem to be any Biasing of the output stage. The distortion must be pretty bad if measured.
Can't say anything about the measured result, all i can say is that this amp is the one i have that have the LEAST distortion in what you hear, and this is up against more amps than i can count, as i said 15+ years in the field so far, also i use to UPGRADE commercial amps, and we are not talking the cheap brands here.

But that said, if anybody here makes it and gets it measured then that would be cool, i don't have access or the TIME to do this, seriously have to make time just to reply here.

Will say again, this AMP is the best i have ever had in my arsenal of audio equipment.
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