On -off relay timer

I have an idea if an audio sensing relay. After this circuit detects audio it turns on a speaker amplifier for a curtain lenth of time and after that length of time has expired it will then turn off the amplifier.

I think a 555 timer is in order here. Can someone please help me with this circuit.

Thanks in advance.

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dougw over 1 year ago +2

Conceptually you need a mic followed by an amplifier to SET an S-R flip flop which drives a relay to turn on your audio amplifier. The flip flop also would enable a CD4060 oscillator/counter. An appropriate…

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0 shabaz over 1 year ago

If you take a look at this site:

https://www.talkingelectronics.com/projects/100%20IC%20Circuits/1-100_IC-Ccts.html

(and follow the links at the top for 50 555 circuits, and the two-hundred transistor circuits) you'll find a load of building-blocks that you can experiment with and combine to make what you want.

There are sound-triggered circuit examples there, and there are relay switching and delay examples too, some using 555, some using a 4060 IC which you may well need as Doug mentions.

At the very least, it should give you more than enough ideas to start experimenting and prototyping.

Please share your final circuit to help others.
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0 shabaz over 1 year ago

If you take a look at this site:

https://www.talkingelectronics.com/projects/100%20IC%20Circuits/1-100_IC-Ccts.html

(and follow the links at the top for 50 555 circuits, and the two-hundred transistor circuits) you'll find a load of building-blocks that you can experiment with and combine to make what you want.

There are sound-triggered circuit examples there, and there are relay switching and delay examples too, some using 555, some using a 4060 IC which you may well need as Doug mentions.

At the very least, it should give you more than enough ideas to start experimenting and prototyping.

Please share your final circuit to help others.
Cancel
Vote Up 0 Vote Down

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