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
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
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.
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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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.
The amplifier is in balanced mode internally so you can't bridge it or connect - output to PG.
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?
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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