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Daisy Chain Amplifiers? Answered

I have a couple amplifier chips, and i would like to know how i could daisy chain them (connect them together for more power)

i am using STMicro TDA7266s pdf
i have tried putting amplifier chip in series with each other (not the outputs, but all the pins)

help?

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11010010110 (author)2009-01-19

you need it to output high current at low voltage see what identical chips you have i assume from here on that they are like power opamps connect them in parallel on all pins except output connect a dc filtering capacitor of its own to the output of each connect the outputs of the capacitors together to the speaker output

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NachoMahma (author)2009-01-19

. Starting a new thread to give more room. > what if i were to use a TPA3122D2 . It will do bridging (see Differential Input and BTL Output on page 18). . To do paralleling properly, you need to have access to the op amp inputs. Neither the TDA7266 nor the TPA3122D2 have the pins for that.

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NachoMahma (author)2009-01-18

. I've never done it with two separate amps, but I think amplifier bridging is what you are after.

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Sandisk1duo (author)NachoMahma2009-01-18

no, the term is "daisy chain"

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NachoMahma (author)Sandisk1duo2009-01-18

. Daisy-chaining two audio amps (using the output of one to drive the input of another), won't work unless the second amp is designed for a very high level input.

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Sandisk1duo (author)NachoMahma2009-01-18

oh, i thought daisy chaining was wiring two amp's input in series...

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NachoMahma (author)Sandisk1duo2009-01-18

. OK. Not what I think of when I see daisy-chaining. . Wire the inputs in parallel. Most amps have a fairly high impedance (~30KΩ for your amp), but if your source won't handle two, then add some resistors in series with each input. . If you must wire them in series, then wire the inputs as you would batteries; jumper + on one to - on the other. Doesn't look like that option is available with your amp. :(

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Sandisk1duo (author)NachoMahma2009-01-18
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NachoMahma (author)Sandisk1duo2009-01-18

. I think you will need to go with a paralleled amplifier setup. You need to invert one of the amps for bridging.

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Sandisk1duo (author)NachoMahma2009-01-18

how would i go about inverting the amp?

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NachoMahma (author)Sandisk1duo2009-01-18

. Doesn't look like you can with your amp. You just swap +/- on one amp. The output of one amp is + to the speaker, the other amp is the - side.

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Sandisk1duo (author)NachoMahma2009-01-19

and i'll need two power supplies, right?

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NachoMahma (author)Sandisk1duo2009-01-19

. Depends on what Class amplifier you want. Looking at the PDF in your OP, you can't do it with the 7266.

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Sandisk1duo (author)NachoMahma2009-01-19

D'oh!

alright

what if i were to use a TPA3122D2 datasheet ?

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