Circuit request for sound sensing using transistor (simple circute)

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crouserali

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hello to every one
Is ther is a simple circute with sound sensing?
using a transistor with such feture?
thanks
 

Thank you
The tranasistor should work as a switsh triggerd by any audio signal as the the transistor is connected to a relay or to activate a small lightand i was wondring if there is an IC that can do this?
best regards
 

Hmm, well you can IC555 to generate ON/OFF signal when sound is generated. The preamplifier output can be given to trigger pin of IC555. Trigger levels can be adjusted with respective register.

Search for more 555 based circuits its easily available.
 
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