Hi, I have just completed designing a stereo channel selector with the purpose of driving a headphone output. The circuit is able to drive speakers as well, but the sound quality is not much to brag about. Therefore I would like to add a switch to the channel selector that enables switching between an audio amplifier (for use with speakers (let’s call it*speaker mode*)) and the already implemented output (headphones (let’s call it *normal mode*)).
Link to the stereo channel selector: http://www.electronicsforu.com/efylinux/circuit/feb2003/Add on stereo channel selector.pdf
There have been done some minor changes in the linked design to fit a 5V supply. The stereo output is driven by a TDA7050 (headphone amplifier).
I have not done the audio amplifier design yet, that remains for another day. I would just like to implement the switching capability on the channel selector and add the audio amplifier at a later point.
From what I understand it is not possible to use a normal analog switch to switch between *normal mode* and *speaker mode*. There will be a big bang sound if it is done in that fashion (?). If I am not mistaken the following should be done:
1) The signal should be attenuated (or muted) as much as possible before it is fed into the audio amplifier?
2) There should be implemented a delay from when the switch between *normal mode* and *speaker mode* is initiated, to when the signal from the input is fed to the audio amplifier.
My question is if anyone here has any suggestions on how I could implement such a switching mechanism with delay and attenuation?
Tnx in advance!
Link to the stereo channel selector: http://www.electronicsforu.com/efylinux/circuit/feb2003/Add on stereo channel selector.pdf
There have been done some minor changes in the linked design to fit a 5V supply. The stereo output is driven by a TDA7050 (headphone amplifier).
I have not done the audio amplifier design yet, that remains for another day. I would just like to implement the switching capability on the channel selector and add the audio amplifier at a later point.
From what I understand it is not possible to use a normal analog switch to switch between *normal mode* and *speaker mode*. There will be a big bang sound if it is done in that fashion (?). If I am not mistaken the following should be done:
1) The signal should be attenuated (or muted) as much as possible before it is fed into the audio amplifier?
2) There should be implemented a delay from when the switch between *normal mode* and *speaker mode* is initiated, to when the signal from the input is fed to the audio amplifier.
My question is if anyone here has any suggestions on how I could implement such a switching mechanism with delay and attenuation?
Tnx in advance!