hi!
Does this topology will work well?
I've draw the basic schematic...
Regards,
Pedro Martins
Does this topology will work well?
I've draw the basic schematic...
An externally hosted image should be here but it was not working when we last tested it.
Regards,
Pedro Martins
Why so many op-amp's in stead of a single buffer-chip with sufficient output power?
I suppose you consider the first op-amp (on the left side of the schematic) to act as a driver since it is connected differently than the rest? No need to use a "driver", if the input impedence is as high as a typical op-amp (don't know your particular chip).
Remember, headphones use fairly little power, so a lot of circuits should be able to do the trick.
Have you tried to simulate a circuit, which is basically a class-A buffer stage (voltage follower)? It seems to me that you're making life more complicated than it needs to be.
Jennice
I suppose you consider the first op-amp (on the left side of the schematic) to act as a driver since it is connected differently than the rest? No need to use a "driver", if the input impedence is as high as a typical op-amp (don't know your particular chip).
Remember, headphones use fairly little power, so a lot of circuits should be able to do the trick.
Have you tried to simulate a circuit, which is basically a class-A buffer stage (voltage follower)? It seems to me that you're making life more complicated than it needs to be.
Jennice
The input impeadence to an op-amp is very high. The output impeadence is much lower. The only reason to use op-amps in this fasion is to put RC filters in between them to make an active filter network. You are attempting to lower the output impeadence of the op-amp circuit by parralelling the devices. There is a much easier way to amplify current. It is called an emitter follower circuit. (or source follower if you use a FET). Use one op-amp to drive the emitter follower stage which will drive the speaker or headphone.
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