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Sound activated switch/timer

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nandgate

New Member
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

Active Member
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:


And for monostable search in google.
 

bogdanfirst

New Member
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
 
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