Noise or voltage triggered relay

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adamzski

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Hello, I need a relay to be triggered from either a sound or voltage.

Could anyone help? I have very limited knowledge.

What I am trying to achieve is that when a sound comes out of a speaker a relay is tripped.

I thought I could connect a wire to the speaker then when a voltage comes through I could activate my relay or I could use something to detect a loud sound..

Cheers
 

How do you want to operate a relay. Switch it for a defined period of time, switch until manually reset.....
Tapping into the speaker line might be a better option.
 

Hi thanks, I want to switch it for about 3 seconds.

and yes I was thinking that going of the speaker would be easier.
 

I drew circuit for you, if someone will practice and count component values
in circuit.
If relay coil current > 100mA , add transistor to drive relay coil.

View attachment speaker_relay_del_out.pdf

Regards KAK
 
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