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Discrete Cell Phone Ringer

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George L.

New Member
Hello everyone,

got a really good idea for a joke/project...

Would it be possible to make a really small device to ring like a cell phone after it is set to on a timer. This way, at my high school, I could sneak it into someones bag or around their area, and during class, it will sound like their cell phone rang. The teacher will be distracted and go off on a crazy tangent and waist time in class. (Happens all the time anyway :lol: ).

Could I use 2 555IC or something simple to replicate the simple ringing sound of a cell phone?

I would really appreciate some help.

thanks,

George L. 8)
 

audioguru

Well-Known Member
Most Helpful Member
(censored) idea. Is it smart to waist (waste) your teachers time?
Why are you there?

If you can make a couple of 555 ICs make the ringing sound of downloaded music like cell phones do, then you are a genius.
 

Mike - K8LH

Well-Known Member
It could still be done with two little 8-pin devices (an 8-pin PIC and an 8-pin 24LC256 serial eeprom)...

As 'Guru suggests, put those energies to work on something constructive (grin)... And if you're interested, here's a link to Roman Black's PIC 1-bit Sound...

Regards, Mike
 

Someone Electro

New Member
If you have an big serial EEPROM then its better to go 8 bit.The sound will be much better and its easyer beacaus serial EEPROMs output data in 8 bit chunks.

Microchip makes EEPROMs up to 1 Mbit.You can store quite a lot on that.
 

George L.

New Member
Hello,

I don't want to play crazy music, that is impossible with 555, you are right, I would be a genious :lol: .

I just want to make a simple one tone ring, like the nextel phones. (Br-Brr-Brr-Brrr...really fast)

One 555 makes the tone, other switches on and off fast.

Is this possible, and small enough to fit into a 1.5 cm cube?

I would solder the components directly together.
 

audioguru

Well-Known Member
Most Helpful Member
A couple of 555's are small and quiet.
What will power them?
What will produce the sound?
 
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