Re: Analog switch configuration

Winfield Hill wrote:
On the other hand, we don't know about pispaspos' source and
destination circuit biasing, perhaps the electrolytics can be
eliminated in the full design, after the dust settles.

I could switch to design to dual supply, but I think working with
single supply would be a learning experience for me. So, my audio
signals thru out the circuit are being biased at VCC/2.


Now, addressing pispaspos' choice of cmos switch IC. Why use a
large-area 1.3-ohm switch for relatively high-Z audio signals?

Good point. This is the first time I've dealt with this type of switch.
The only information I gathered about them is from the application
notes... namely, from TI and Maxim's. Somewhere there, I read that in
order to prevent distortion in my audio signal I should use a switch
with a low on-resistance (Ron).

I wonder what pispaspos will choose for his headphone amplifier
in his 3-volt low-voltage powered system?

So far, I've tried using a MAX4410 and a TPA6102A2. The MAX4410 seems
very sensitive to its surrounding, and since I am not a master in PCB
layout, I'm afraid that I may not get it to work properly. The
TPA6102A2 seems to be less sensitive, but I'm hearing a lot of static
noise in my headphones even when the sound is off. However, I think
this may be caused by the noisy output of my soundcard because when I
took the sound input off from the circuit it became silent.


Thank you!

.

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