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Old 14th February 2006, 11:41 AM   #1
myanmar is offline myanmar  Myanmar
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Default Bridge Parallel AMP

Hello Friends,

I already tested TDA2030 & TDA2050 BPA.

How can I calculate Out Put Power for that BPA?
Because I want to know the cost per power.

Can I get more efficient if i increase to Four bridge parallel?
I want to know cost & effect.

Pls, help me.
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Old 14th February 2006, 02:09 PM   #2
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You should be getting roughly 56watts at 4ohms if I did the math right.
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Old 14th February 2006, 02:24 PM   #3
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Once you have bridged once, you have achieved the maximum voltage swing you can, therefore adding more parallel stages will only increase the current drive, making it easier to drive low impedance loads, it won't make the amp physically louder with the same typical 8 ohm speaker.
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Old 14th February 2006, 08:00 PM   #4
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Default Bridge parellel amp

V*A=W simple but effective, volts times amps = watts, ie. a LM3875 will produce 56watts into an 8 ohm load with a +/- 35V supply. So if the amp is bridged each chip will see 140V swing. With the original amperage of each chip, or a theroretical 4* power gain 224watts, but that will far exceed the chips dissipation, limiting the overall output power to around 2*.
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Old 14th February 2006, 08:09 PM   #5
Bazukaz is offline Bazukaz  Lithuania
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Cost per power will be better for higher power ICs , like LM3886 or so.
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Old 15th February 2006, 05:39 AM   #6
myanmar is offline myanmar  Myanmar
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Quote:
Cost per power will be better for higher power ICs , like LM3886 or so.
In our country cannot buy LM3886.
How much cost for that Chip?
In our country TDA2050 is below 0.9 US $.
TDA 2030 is below 0.4US $.
My price is cheap or not?



Quote:
Once you have bridged once, you have achieved the maximum voltage swing you can, therefore adding more parallel stages will only increase the current drive, making it easier to drive low impedance loads, it won't make the amp physically louder with the same typical 8 ohm speaker.
Is 4ohm spk louder than 8ohm spk?
Because volts times amps = watts.
Watts increase mean louder.
Is it true or not?




Sorry for my poor english.
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Old 15th February 2006, 09:22 AM   #7
Arius is offline Arius  United States
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Ah how nice to see someone from Myanmar here. My wife went there a few times for business and she says they're a very friendly people.

TDA2030 - that's my childhood GC.

With 2 chips in bridge mode, you get up to 4X the power of a single chip. However, each chip sees half the load impedance so driving a 4ohm load is not advisable. You could however, as you mentioned, have 2 paralled pairs in bridge mode for a total of 4 chips. This adds extra complexity to ensure equal current sharing such as offset trim and/or precision output resistors.

Keep in mind that the bridge mode won't be noticeably louder. You'll need like 10 times the power to double subjective loudness.

Why not build a discrete design instead? You can easily scale that to any power level (within reason) and there are many true, tried and tested designs out there (e.g. Leach, Rod Eliot's amps, Slone's many amps). Some of them are not complicated and can provide better power and performance as compared to the TDA2030.

Back to your original question, if you want to know the real output power, you can measure the voltage developed across a load resistor.
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Old 15th February 2006, 09:55 AM   #8
myanmar is offline myanmar  Myanmar
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Quote:
Keep in mind that the bridge mode won't be noticeably louder. You'll need like 10 times the power to double subjective loudness.
Our ear can listen (Log) for Loudness.
Is that right?




Quote:
Ah how nice to see someone from Myanmar here. My wife went there a few times for business and she says they're a very friendly people.
That's right.
But I am not myanmar.
I am chinese lived in myanmar & nationality is myanmar.




Quote:
Back to your original question, if you want to know the real output power, you can measure the voltage developed across a load resistor.
I already tested tda2050BPA with scope when attached speaker 8 ohm ( 2spk inparallel )
Output voltage is max +/- 35~40 V in scope.
What watts of my amp?
If you can calculate, pls give me calculation method.

OR I must use 8ohm or 4ohm real resister (not speaker) for calculate watts?
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Old 16th February 2006, 03:11 AM   #9
myanmar is offline myanmar  Myanmar
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Hello Friend,

Quote:
Output voltage is max +/- 35~40 V in scope.
My scope calibaration error.
Output voltage is max +/- 25~30 V.
My power supply drop to +/- 37V too.
Normal Power supply is +/- 45V.


Yesterday I tested with no load.( not attach spk )
Because I want to know maximum output voltage.
Voltage swing above 30V.
But My BPA burn out.
Why?

Pls, Help Me.
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Old 16th February 2006, 04:29 AM   #10
Arius is offline Arius  United States
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Quote:
Output voltage is max +/- 25~30 V.
My power supply drop to +/- 37V too.
Normal Power supply is +/- 45V.
Um, did you mistype? Neither TDA2030 nor TDA2050 can withstand +/-45 rails. Max is +/-25V.
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