Whistle activation system? help!!!

[mossy]

PROJECT
I need to devise a system which will turn on a bulb when somebody whistles. I'm only student so please ignore some silly things i mite say.
i'm thinking:

electret mic,some kind of amplifier,filter,rectifier,comparator,Flip flop,transistor,relay.
wot ye reckon??

 

[ljcox]

I suggest you might search this forum and other internet sites such as www.discovercircuits.com for a "Voice activated switch"

There should be plenty out there

 

[Optikon]

PROJECT
I need to devise a system which will turn on a bulb when somebody whistles. I'm only student so please ignore some silly things i mite say.
i'm thinking:

electret mic,some kind of amplifier,filter,rectifier,comparator,Flip flop,transistor,relay.
wot ye reckon??

What you describe will turn on with a WHOLE LOT more sounds than a whistle! You need to be able to detect "whistle" from all other noises.
A whistle is multi-tone(and varies from person to person) so you might need several bandpass filters.

 

[Nigel Goodwin]

A whistle is multi-tone(and varies from person to person) so you might need several bandpass filters.

Try whistling and monitoring it on an oscilloscope, a whistle can be a pretty good sinewave - a 567 tone decoder PLL could be used to detect it.

 

[electronist]

Is the whistle sound necessary or will a clap switch do?

 

[mossy]

i thought a clap switch might have too broad a spectrum and a whistles freq will be more specific
i could see the whistle freq on a spectrum analyser and build da circuit round that?
what components will i need?

 

[electronist]

But isn't it true that the wistle sound of different people will have a different spectrum. In that case the ckt will function for only a single person, that too if he maintains his whistle sound constant

 

[mossy]

yes very true so what is my best option??
a hand clap would have very wide (lower freq) spectrum too wud it not??alot easier to turn on by accident,no? :?:

 

[electronist]

No way, you can ensure a safe system by making your circuit activate on two claps. In this way false trigerring can be removed to a large extent. This can easily be done by devising a counter with a count of two. ie on receiving two clock pulses the output is achieved. simple.

 

[mossy]

good thinking...any circuit for me to go by or have u a basic block diagram for me to work off??
electret,amp,counter,flip flop,transistor,relay,light
wot ya reckon??

 

[electronist]

The ckt is available here www.electronicsforu.com/electronicsforu/ lab/freecircuitslist.asp?id=304

 

[mossy]

for sum reason i cant find this page can you save it and send it to me??

 

[electronist]

just google clap switch and the very first choice will lead you to a site ElectronicsForYou.com
It is in pdf format

 

[chemelec]

https://www.electronicsforu.com/electronicsforu/

Use this link. Go to More Circuits, than find "Clap" circuit about 3/4 down the page.

Actually number 57