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Old 10th December 2002, 08:32 AM   #1
hacknet is offline hacknet  Singapore
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Default Bridging amps

i have read in prev. threads that one cannot double bridge the tda1554 chip... i believe that it has 4 intergrated amps... so the max it can run wud be at 2 channels...

i cannot double bridge because of the load becomes too low or because it juz doesnt allow things like this to happen?
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Old 10th December 2002, 11:31 PM   #2
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ive made my 1st small 2x22watt amp. using the TDA1554 IC.
u've 2 options using this IC. :

* 2 channels 22watt each.
* 4 channels 11watt each.

so can u explain ur ques. plz?
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Old 11th December 2002, 12:16 AM   #3
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Default Re: Bridging amps

Quote:
Originally posted by hacknet
i have read in prev. threads that one cannot double bridge the tda1554 chip... i believe that it has 4 intergrated amps... so the max it can run wud be at 2 channels...

i cannot double bridge because of the load becomes too low or because it juz doesnt allow things like this to happen?
Hi,

Not quite sure what you mean by double bridging?

I know that a bridged amp is basically two amps, with one of the amps running an inverted signal. You then hook the speaker across both of the outputs, that way you can deliver twice the voltage to the same load. Since P = V^2/R, That means two times the voltage = four times the power.

You need to be careful, since each amp will be overloaded by twice what it was before. The rated power of the bridged amp will be capible of only double that of any single amp, but will try to deliver four times the power.

-Dan
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Old 11th December 2002, 03:50 AM   #4
hacknet is offline hacknet  Singapore
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here is wad i mean
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Old 11th December 2002, 10:05 AM   #5
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Unhappy Really not possible

The chip you want to use already provides 2 bridged outputs, not suitable for the connection you wrote.
A possibility is to "parallel" two output stages thus increasing output current capability but to do so you should connect (not "brutal" paralleling though) 1st and 3rd amplifier , then 2nd and 4th (from high to low in your picture).

This connection should be made placing a power resistor (.22 to .47 or more ohms, 3-5W) on each output and then joining the "free" end of the resistors; this point will be used as the output to speakers.

Notice that you will not have any output power increase, but only a better current capability, that will eventually give you more power on lower impedance loads.

That's all.

Andypairo
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Old 11th December 2002, 10:57 AM   #6
hacknet is offline hacknet  Singapore
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could u edit it on the picture... i dun wan to blow up the amp ic... it cost a cool $9
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Old 11th December 2002, 11:13 AM   #7
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Here is how it should be... but if you don't exactly know what you're doing... just don't do it.
I don't want to be responsible of damages...
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Old 11th December 2002, 12:45 PM   #8
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look, if u r looking into more power and more reliable amp.
u can use the TDA1562Q,, its 70watt into one channel, am
currently making a 2 channel ver. for my coaxial car speakers..
i know it gonna cost more but sure it'll be more reliable with less
THD within the same range of power u r looking for,,
ive the schematics of the 2channel ver. if u want it..
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Old 11th December 2002, 01:07 PM   #9
hacknet is offline hacknet  Singapore
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lets look at it... thx...
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Old 11th December 2002, 02:03 PM   #10
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here's the url:

http://www.freeweb.hu/majki/elektro/...lips_2x55w.pdf

the pcb is also included..
enjoy!
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