Sound activated switch/timer - Electronic Circuits Projects Diagrams Free

nandgate · 29th March 2003, 10:12 PM

i would like a circuit diagram and materials list for a project that would pick up a sound via condensor mic and filter it for a certain frequency range (10KHz~15KHz) and strength (80db). This frequency and db must be used to activate a timer and switch for a period of say 90 seconds to take control of the circuit and then return control to the main controlling device. All help will be greatly appreciated. Thanks.

**kinjalgp** · 30th March 2003, 04:00 AM

You' require a clap activated switch long with a monostabe multivibrator with on time of 90 seonds which is triggered by the clap switch.
You can find schematic of clap switch at:
http://www.electro-tech-online.com/v...t=171&start=15

And for monostable search in google.

bogdanfirst · 30th March 2003, 03:35 PM

why not a 555?it works fine....
but you need to adjust the clap circuit, beacuse when you clap your hands you dont generate 10KHz....!!!!!
maybe it will not work...
i think of something like an amp, a filter and trigger....and of course the 555 monostable

**kinjalgp** · 30th March 2003, 03:51 PM

Even I was talking about monostable based on 555.

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29th March 2003, 10:12 PM	(permalink)
nandgate	Sound activated switch/timer i would like a circuit diagram and materials list for a project that would pick up a sound via condensor mic and filter it for a certain frequency range (10KHz~15KHz) and strength (80db). This frequency and db must be used to activate a timer and switch for a period of say 90 seconds to take control of the circuit and then return control to the main controlling device. All help will be greatly appreciated. Thanks.

30th March 2003, 04:00 AM	(permalink)
kinjalgp	You' require a clap activated switch long with a monostabe multivibrator with on time of 90 seonds which is triggered by the clap switch. You can find schematic of clap switch at: http://www.electro-tech-online.com/v...t=171&start=15 And for monostable search in google. __________________ "There is no way to peace, peace is the way!"

30th March 2003, 03:35 PM	(permalink)
bogdanfirst	why not a 555?it works fine.... but you need to adjust the clap circuit, beacuse when you clap your hands you dont generate 10KHz....!!!!! maybe it will not work... i think of something like an amp, a filter and trigger....and of course the 555 monostable

30th March 2003, 03:51 PM	(permalink)
kinjalgp	Even I was talking about monostable based on 555. __________________ "There is no way to peace, peace is the way!"