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Old 7th August 2002, 06:05 PM   #1
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Location: Germany
Question PA Amp with TDA 7293...Questions...

Hi,

I'm new here and I've got some questions:


Some time ago I bought this power mixer (2x150W @ 4Ohms; Bridged 1x300 @ 8Ohms):

http://128.134.140.230/english/product/ca-6215.html

Well, the whole amp (not the pre-amp) got destroyed and i tried to fix it (all 8 power transistors were destroyed and some other parts) but i had no luck - it's kinda hard working without the original schematic and a lack of original parts.


So I thought about creating my own amp (of course, i'll keep the preamp and mixer) as i dont wanna pay too much for reparing. since the heat sink had holes for 8 transistors i could easily install TDA7293s instead.

So this was my idea:
- Change the transformer (2x40 ~ V is too much) and replace it with my 2x30 V ~ . Is the voltage low enough ?
- I first only want to build one channel using 4x TDA7293 (4 parallel and bridged (2 and 2)) - How much power can I expect ? It will be more than original 150@4Ohms, right ?

I'm not big amp expert, so i thought this would be a kind of easy solution ? What do you think ?

Thanks .

PS: Some electronic parts store (germany) offers TDA7294V and TDA7293 (without "V") - does such a without-V-version exist at all or can i expect it to be the TDA7293V ?
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Old 7th August 2002, 08:03 PM   #2
djdan is offline djdan  Romania
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TDA7293 it is a very good circuit, but in this case it is not the best option . You can make an amplifier with two STK4048 and you can use original transformer. It would be cheaper solution. Try to make a search on this forum and you will get many topics about STK4048. I know a pro-amplifier with STK4048 [ 2x200w/4ohm ] wich is runing for 5 years every night in a small nigh-club.
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Old 7th August 2002, 11:09 PM   #3
Herman is offline Herman  Germany
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Join Date: May 2001
Location: Europe
Right, the STK series is good and quite convenient to use. But you have to be careful about the heatsink. The hybrids dissipate a lot of power, so take care to have a big enough heatsink or use fans. You can easily burn your fingers at the heatsink (my experience!).
If necessary, you will find a lot of data sheets at

http://www.datadart.com/al/sanyodata.htm

Good luck!

Herman

P.S. In Germany, most of the circuits can be obtained at Reichelt electronics, check at www.reichelt.de
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Old 8th August 2002, 12:30 AM   #4
lohk is offline lohk  Europe
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I would suggest the "UB" way.

You get all the necessary information and the parts (in german, also pdf) from SCHURO
http://www.schuro.de/preisl-hiamp100.htm
and from the constructors site
http://www.ub-elektronik.de/elektronik/index.htm

The TDA7293 is kind of tricky for newbies, so be careful with bridged - or better - paralleled versions.

At the Audiomap forum http://www.audiomap.de
under "Selbstbau-Elektronik" you will find guys who have already gained lots of experience.

hope that helps
Klaus
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Old 8th August 2002, 06:10 PM   #5
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Thanks for the information.

Looks like Reichelt (reichelt.de) doesn't have the 4048 any more (Yesterday I found the V version, but not the XI) - Today the only thing >4044 I found was the STK 4050 V. Is it any good ?

And the TDA 7293 is available.

I guess I have to replace the transformer anyway cuz it is probably not power enough for a more powerful amp. And I have a 2x30V ringcore transformer here anyway.

Well, I just want a simple, powerful and stable amp Some more power than the 150 W would be cool.
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Old 8th August 2002, 08:59 PM   #6
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the STK4048XI is powerful then TDA 7293
and more high q..... the sound on stk4048XI batter then TDA 7293........

if u want more power :
STK4050V - 200W
LM12 (in Bridged) - 300W - very very simple!!!! to build
PA03A - 1000W the site - http://radvs.boom.ru/ims-unch4.html
PA05A - 300W

lm 12 :
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