Smoke Detector Chirper Speaker - Electronic Circuits Projects Diagrams Free

Migs · 2nd April 2007, 10:15 PM

Amigos:

Does anyone know the right name for a smoke detector's "chirping" speaker. More importantly, does anyone know where to buy these loud things?

Thanks in advance,

Migs

HarveyH42 · 2nd April 2007, 10:21 PM

http://www.goldmine-elec-products.co...?number=G13545

Migs · 2nd April 2007, 10:41 PM

Wow Harvey .. That was FAST!

Thanks! -Migs

audioguru · 3rd April 2007, 01:35 AM

Here is the simple oscillator inside a piezo beeper. It has positive feedback from a terminal on the piezo so it oscillates at the loudest frequency and the resonance of the small cover is tuned to the resonance of the piezo wafer.

HarveyH42 · 3rd April 2007, 05:50 AM

Quote:

Originally Posted by audioguru

Here is the simple oscillator inside a piezo beeper. It has positive feedback from a terminal on the piezo so it oscillates at the loudest frequency and the resonance of the small cover is tuned to the resonance of the piezo wafer.

Cool, I have a few 3 wire elements, but never knew what to do with them. No cover, guess I could poke a hole in a beer cap, about the same size if I remember right...

Migs · 3rd April 2007, 01:08 PM

Wow Harvey .. That was FAST!

Thanks! -Migs

Migs · 3rd April 2007, 01:10 PM

Audioguru:

Will that circuit work with the item HarveyH42 linked above?

Migs

audioguru · 3rd April 2007, 02:06 PM

Hi Migs,
The simple circuit I posted is already inside the cheap beeper that Harvey showed. All you need to do is apply a DC voltage to it and it makes a continuous beep.

Migs · 3rd April 2007, 04:43 PM

Thanks Uncle Scrooge! -Migs

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2nd April 2007, 10:15 PM	#1
Migs	Smoke Detector Chirper Speaker Amigos: Does anyone know the right name for a smoke detector's "chirping" speaker. More importantly, does anyone know where to buy these loud things? Thanks in advance, Migs __________________ "Sometimes we forget that the world itself is paradise." Douglas Coupland, 'Microserfs' "We either make ourselves miserable, or we make ourselves strong. The amount of work is the same." – Carlos Castaneda "One single grateful thought raised to heaven is the most perfect prayer."- G. E. Lessing

2nd April 2007, 10:21 PM	#2
HarveyH42	http://www.goldmine-elec-products.co...?number=G13545

2nd April 2007, 10:41 PM	#3
Migs	Wow Harvey .. That was FAST! Thanks! -Migs __________________ "Sometimes we forget that the world itself is paradise." Douglas Coupland, 'Microserfs' "We either make ourselves miserable, or we make ourselves strong. The amount of work is the same." – Carlos Castaneda "One single grateful thought raised to heaven is the most perfect prayer."- G. E. Lessing

3rd April 2007, 01:35 AM	#4
audioguru	Here is the simple oscillator inside a piezo beeper. It has positive feedback from a terminal on the piezo so it oscillates at the loudest frequency and the resonance of the small cover is tuned to the resonance of the piezo wafer. Attached Thumbnails __________________ Uncle $crooge

3rd April 2007, 01:08 PM	#6
Migs	Wow Harvey .. That was FAST! Thanks! -Migs __________________ "Sometimes we forget that the world itself is paradise." Douglas Coupland, 'Microserfs' "We either make ourselves miserable, or we make ourselves strong. The amount of work is the same." – Carlos Castaneda "One single grateful thought raised to heaven is the most perfect prayer."- G. E. Lessing

3rd April 2007, 01:10 PM	#7
Migs	Audioguru: Will that circuit work with the item HarveyH42 linked above? Migs __________________ "Sometimes we forget that the world itself is paradise." Douglas Coupland, 'Microserfs' "We either make ourselves miserable, or we make ourselves strong. The amount of work is the same." – Carlos Castaneda "One single grateful thought raised to heaven is the most perfect prayer."- G. E. Lessing

3rd April 2007, 02:06 PM	#8
audioguru	Hi Migs, The simple circuit I posted is already inside the cheap beeper that Harvey showed. All you need to do is apply a DC voltage to it and it makes a continuous beep. __________________ Uncle $crooge

3rd April 2007, 04:43 PM	#9
Migs	Thanks Uncle Scrooge! -Migs __________________ "Sometimes we forget that the world itself is paradise." Douglas Coupland, 'Microserfs' "We either make ourselves miserable, or we make ourselves strong. The amount of work is the same." – Carlos Castaneda "One single grateful thought raised to heaven is the most perfect prayer."- G. E. Lessing