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Old 27th January 2015, 09:39 PM   #1
AMDV is offline AMDV  United Kingdom
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Default TDA7297 output

Hi guys,
I have a small TDA7297 stereo amp (15W +15W).
Is acceptable to connect both the L and R outputs to a single speaker for mono operation (assuming the speaker is not overpowered)?
Cheers,
DV
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Old 27th January 2015, 11:00 PM   #2
sreten is online now sreten  United Kingdom
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Hi,

No. You can parallel the inputs, but you need to add say 0.22R series
resistors to all 4 outputs before combining them to 2 terminal mono.

Well that is the theory, but in practice it is hard to say if they are
really needed, I suspect due to internal chip details not given in
the datasheet, perhaps not. But better safe than sorry.

The small resistors are needed to absorb any small voltage
DC offsets and AC gain differences between the two amplifiers.
Those sort of resistances may already be in the chip.
IMO they probably are, but I'm not guaranteeing anything.

rgds, sreten.
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Last edited by sreten; 27th January 2015 at 11:04 PM.
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Old 27th January 2015, 11:26 PM   #3
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It's been done, paralleled (no resistors). It may not be as accurate. They're cheapish, so trying two chips might be a nice idea, and not paralleling.

The amplifier is in balanced mode internally so you can't bridge it or connect - output to PG.
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Old 28th January 2015, 02:10 PM   #4
AMDV is offline AMDV  United Kingdom
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Great info guys, thank you very much for helping me. In that case I might just join the two inputs and just use of of the outputs. Is any hard done leaving an output disconnected?
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Old 28th January 2015, 02:32 PM   #5
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No, not at all. Very few speaker amplifiers are not open-proof, and even fewer of these would qualify as solid state.
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Old 29th January 2015, 01:48 AM   #6
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It has built in protections.
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