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Old 24th December 2012, 10:00 AM   #31
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I'll check it out.. XD lol If i even know my correct address
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Old 8th January 2013, 10:28 PM   #32
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How to bridge two LA4225 datasheet(3/3 Pages) SANYO | Monolithic Linear IC Audio Output for TV application 5W Monaural Power Amplifier together so I get more power?
Or how do I set them up to use for stereo two channel sound?
I have 6,200uF for the capacitors output for the speakers
And 8.7uF for the input with a filter at the input to filter out super high frequencys over 50khz.
If I make two of these how would I bridge them? Or use them for stereo output? each individually going to a different speaker and one for the left channel and one for the right channel.
And if possible how would I bridge them with a small subwoofer?
Or is this a bad idea waiting to happen... because I don't want to melt anything

Last edited by realflow100; 8th January 2013 at 10:33 PM.
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Old 9th January 2013, 04:33 AM   #33
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In order to get double the sound level, u need to increase the output, ten times. Doubling the power will sound a little loud (3dB).

Gajanan Phadte
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Old 9th January 2013, 08:28 PM   #34
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How do I get more power without using more voltage?
do I have to add many chips and bridge them? Or would just 2 or 4 be enough?
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Old 9th January 2013, 11:39 PM   #35
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Have you learned some basic theory yet? There are several ways to 'more power'. As you have alluded to, one can operate at a higher voltage. One can also operate at higher current, generally by reducing the impedance the amplifier drives. Bridging is effectively the same as using a higher supply voltage, without actually raising the operating supply voltages.

You should only need two amplifier chips. The key here is to configure one to operate in non-inverting mode, and the other in inverting mode at the same value of gain. The speaker is then connected to the output pins of each amplifier chip, + to the non-inverting amp and the - to the inverting amp. Bridging theoretically behaves like doubling the supply voltage, so neglecting losses would theoretically quadruple the power since power rises with the square of voltage given the same load impedance.

In reality there are losses to consider, but doubling output power isn't unreasonable. Bear in mind that our hearing is not linear with respect to electrical power and perceived loudness. A doubling of power is only just noticeable and an effective doubling of loudness takes about ten times the electrical power.

Edit: I looked at the data sheet to see that the gain and mode of operation are internally fixed with these chips. It is still possible to bridge them but will require at least one additional stage - an inverting unity gain buffer to feed the second chip since there is no direct access to both inputs.
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Last edited by jkuetemann; 9th January 2013 at 11:51 PM. Reason: Additional information
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