Project: Night Buzzer - Page 5 - Electronic Circuits Projects Diagrams Free

Stellarcore · 20th February 2008, 10:34 PM

Here's an idea for those doing this with a PIC or other micro. To add a bit of evilness, setup the PICs internal timer1 as a makeshift RTC and have it chirp at random intervals between 1 and 10 minutes. You could also choose a random frequency to drive a piezo speaker.

If it chirps with a predictable period, it is probably more likely that your device will be discovered.

ollillo · 7th March 2008, 03:53 PM

whats the volage rating of the electrolytic capacitor?,
And is there other alternative for the buzzer??

Hero999 · 7th March 2008, 04:36 PM

Come on, use your common sense, what is powering the circuit?

Just select a capacitor with a higher voltage rating than the power supply

veez · 15th April 2008, 10:24 PM

Hi, I am interested in this project.

I need a bit of help with the parts.

Which LDR and buzzer did you guys use. Please specify model #

thanks

veez · 16th April 2008, 07:50 PM

Hi , so I got a 6V DC mini buzzer.

I tested the buzzer just connected to a 1.5V battery. And it worked.

But when i put a resistor of even say 220 ohm in the path of the buzzer and battery, it stopped working. (maybe its making very dim sound).

But with the whole circuit It doesnt work at all.

Any help?

Thanks

audioguru · 16th April 2008, 09:50 PM

The circuit is designed for a piezo beeper which uses a very low current, not a mechanical buzzer that uses a high current.

wingerr · 19th April 2008, 01:09 PM

Better make sure the victim has enough sense of humor so your poor electronic cricket doesn't get stepped on if he finds it-

That would be the advantage of the cheaper and less elaborate circuit, if it does get found, more disposable-

I've encountered real life crickets that would be a good model for what this should do- chirps away happily until you get close trying to find it, and then it stops, only to resume when you get tired of standing around waiting for more clues as to where it is, and walk away. Maddening.

7th March 2008, 04:36 PM	#63 (permalink)
Hero999 Experienced Member Join Date: Apr 2006 Location: England Posts: 7,010	Come on, use your common sense, what is powering the circuit? Just select a capacitor with a higher voltage rating than the power supply __________________ What's so bad about Microsoft? Get Opera it's simply a superb browser.

16th April 2008, 09:50 PM	#66 (permalink)
audioguru Experienced Member Join Date: Mar 2004 Location: Canada, of course! Posts: 11,790	The circuit is designed for a piezo beeper which uses a very low current, not a mechanical buzzer that uses a high current. __________________ Uncle $crooge

Thread Tools
Show Printable Version Email this Page
Display Modes
Linear Mode Switch to Hybrid Mode Switch to Threaded Mode

20th February 2008, 10:34 PM	#61 (permalink)
Stellarcore Experienced Member Join Date: Jul 2007 Location: Winnipeg, MB, Canada Posts: 82	Here's an idea for those doing this with a PIC or other micro. To add a bit of evilness, setup the PICs internal timer1 as a makeshift RTC and have it chirp at random intervals between 1 and 10 minutes. You could also choose a random frequency to drive a piezo speaker. If it chirps with a predictable period, it is probably more likely that your device will be discovered.

7th March 2008, 03:53 PM	#62 (permalink)
ollillo New Member Join Date: Mar 2008 Posts: 1	whats the volage rating of the electrolytic capacitor?, And is there other alternative for the buzzer??

15th April 2008, 10:24 PM	#64 (permalink)
veez New Member Join Date: Apr 2008 Posts: 2	Hi, I am interested in this project. I need a bit of help with the parts. Which LDR and buzzer did you guys use. Please specify model # thanks

16th April 2008, 07:50 PM	#65 (permalink)
veez New Member Join Date: Apr 2008 Posts: 2	Hi , so I got a 6V DC mini buzzer. I tested the buzzer just connected to a 1.5V battery. And it worked. But when i put a resistor of even say 220 ohm in the path of the buzzer and battery, it stopped working. (maybe its making very dim sound). But with the whole circuit It doesnt work at all. Any help? Thanks

19th April 2008, 01:09 PM	#67 (permalink)
wingerr New Member Join Date: Mar 2008 Posts: 17	Better make sure the victim has enough sense of humor so your poor electronic cricket doesn't get stepped on if he finds it- That would be the advantage of the cheaper and less elaborate circuit, if it does get found, more disposable- I've encountered real life crickets that would be a good model for what this should do- chirps away happily until you get close trying to find it, and then it stops, only to resume when you get tired of standing around waiting for more clues as to where it is, and walk away. Maddening.