zachtheterrible

Is there a difference between mechanical and piezo? Cuz mine is piezo.

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Someone Electro

Mechanical ones use more power.

Its just an reley that is constantly switching it self on/off.

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res2

:| i want to know..
that project have problem like noise..or others.. :roll: :wink: :wink:

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zachtheterrible

Does it have problems like noise? How is noise a problem in this circuit? Noise is the what you want it to make.

I think you might have to clarify yourself a bit :lol:

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Someone Electro

Its ment to make noise to drive the victim nuts

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andrew12345678

This project has so many things that could be improved and made better, I would Like to see it evolve a sensor, maybe a microphone that could detect people within 3 metres and switch itself off or drop the volume to make it harder to find. :twisted: :twisted:

Someone Electro

It is prosible so do whith an MCU.It cod make the worlds most ophisitcated nuts driver.LOL

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feejay

i've implemented each and every step and designed the circuit on a bradboard but it isn't working i dont know why could you please send me a tutorial which could help me in each and every step so that may be i'll be able to correct the mistake which i am doing in making this circuit

audioguru

The 2nd transistor doesn't have a current-limiting resistor in series with its base. So the 1st time you connect the battery, the capacitor charges through the base of the 2nd transistor with unlimited current and blows-out the base.
If the base does survive, does your buzzer work on the low voltage battery?
Disconnect the photoresistor to see if the circuit makes the buzzer work.

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hartc2697

I'm interested in making the night buzzer that was posted some time ago. It uses two 1000 micro-farad capacitors along with the 9V power supply. I am aware of he energy storing potential of capacitors and want to verify that capacitors are discharged once I start playing with the system. Since this project uses rather large caps, I was wondering if anyone had input on using these safely. I assume I can put 22k capacitor accross the leads but just want to be sure.

audioguru

Your battery is only 9V isn't it? 9V isn't going to shock you. The capacitor won't charge to a voltage higher than the battery.
Your skin is a high resistance that needs a high voltage to cause a shock. The high voltage on your high skin resistance causes enough current to shock you. A capacitor can make a high current but with only 9V the resistance of the load needs to be very low to cause a high current.

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Hero999

If the capacitor is large enough it could burn you though.

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loveangel4943291

loveangel4943291@yahoo.complz i want to find a design for counter which count the number of papers go out from the copy machine and stored the number of copies in small memory plz tell me ur suggestions about this project

hartc2697

I'm not able to get the circuit to pulse on/off as I would expect. Rather it constantly stays on. Do I have the wrong expectations of this circuit?

I had thought this circuit created a pulsing of beeps.
If I'm wrong, could someone point me in a direction of how do accomplish the pulsing chirps? Thanks in advance.

tyeo000

whats the voltage on those caps?