I have a signal line (assume MIC in , which has amplified)
I need to send that signal to another device
the passing or not passing depends on ardiuno output 1 & 0

this pdf show my circuit but it is really should not work

any Idea?

 

why not use a quad bilateral switch chip?

 

Does the signal go negative below ground?

 

For audio switching you could consider, as was mentioned, a quad switch that will allow signals that go negative. The LF13201 might work for you.

General Description
These devices are a monolithic combination of bipolar and
JFET technology producing the industry’s first one chip quad
JFET switch. A unique circuit technique is employed to maintain
a constant resistance over the analog voltage range of
±10V. The input is designed to operate from minimum TTL
levels, and switch operation also ensures a
break-before-make action.
These devices operate from ±15V supplies and swing a
±10V analog signal. The JFET switches are designed for applications
where a dc to medium frequency analog signal
needs to be controlled.

Ron

 

isnt there any circuit that do same thing other than this chip. i cant buy this here. or is my circuit correct? if i can use mosfet for this how?

 

Go back and read post #3. Your audio signal will go above and below 0 volts. The circuit you posted will not work for this. If you want to switch audio read this link. Doing what you want to do while not complicated is not a simple as a single NPN transistor. Depending on your audio you could also likely use a small relay card like this one. The end result is No, your circuit won't work. You can build a circuit like what I linked to, you can use a switch like those linked to earlier or you can use a relay like I linked to. Those are your options.

Ron

 

why not capacitor couple the signal? then you wouldnt need to worry about polarization. I have used bilateral switches to switch audio and video on several different projects, and they worked fine. also eliminates the pop you get when relay switching.

 

why not capacitor couple the signal? then you wouldnt need to worry about polarization. I have used bilateral switches to switch audio and video on several different projects, and they worked fine. also eliminates the pop you get when relay switching.

Capacitor coupling will work fine and is used in a few of the circuits I linked to.

Ron

 

ok.
if signal is coming from 3.3v logic control from a walkie takie. it is set high coming from the walkie talkie.

in this case i think signal is not going into the negative.
so that what chip or circuit you suggest.

cheap single switch ic is best. but no problem other type.

tell me how to google to find that kind of ic. what is the comman name for them.

 

A simple Google of "audio switching circuit" will get you started when you see all the hits including Images for audio switching circuit.

Ron

 

if it is analog then only AND gate is enough for switching?
is it good way to do
or should I use try state buffer?
which one is best