Help please on a remote switch, Easy question for you clever people

[Todzippy]

Hi Guys

I got a real simple question to you experts

I need help with a switch that needs to operate to cut off a feed when a voltage is applied
I was thinking of using a transistor as a switch.

The Switch will be disabling a microphone as one of the Microphones wires pass through the switch /transistor that is always on.

So needs to be low voltage I will be supplying the switch from a sound control sensor switch with an adjustable Delay time:±10-30s

And basically that's it'.

What type of switch or transistor should i be looking for on ebay please

Really appreciate any help

[Todzippy]

Views 22 not one answer ? to such an easy peasy little question

Thanks'

[Todzippy]

Maybie my question was a little confusing for you??  2 months and i still cannot find what kind of switch i need.

I will pay £20 by paypal to anyone that can tell me the answer

heres my question again in simple mans terms.

I have made a robot that Listens through Voice recognition software and responds with recorded voice samples by Macro commands.

It works fantastic but' I have one small problem

When the robot speaks the microphone picks up the sound loop and triggers off another command without finishing off the last sentence.

So what I need is when sound is playing through the speaker the microphone is switched off.

I was thinking of using a sound to light device and instead of the voltage feeding a light it will go to a switch that when a voltage applied turns off.

So one of the microphones wires will pass through a switch that is always in the contact position and then when the voltage is applied the contact opens up therefore disconnecting the microphone.


So what I am looking for is a switch that is always on and when a low DC voltage applied it turns of / disconnect's the input - output


I hope I have explained a bit better and will be very grateful if anyone can tell me what the switch or device is called that I am looking for.

[mklrobo]

  Hello!
I would offer an opinion...
My first response, is one in which I used in a scanner.(confusing?)
Sounds like you need a squelch circuit, to activate a cutoff switch.
A delay could be put in, with the threshold of the level of the audio
controlled too, to avoid level overshoot.
Now, for compactness, the circuit may be avaliable in SMT format,
which reduces the size to a transistor. Soldering will be tricky, as heat
in these devices can destroy them quickly. The squelch circuits, used in
scanners, detect audio, (blocking capacitor for DC) and thus, your dual
problem is solved.
This activation can be used as feedback, to navigate other problems, if any.
If you find this helpful, just click yes for helpful near my Icon.  No money
is necessary. If you need a circuit, I may be able to dig one up, and post it.
If you have any further questions, please post, I will try to help you.