Pulse circuit

[Chipper]

I want build a very small cheap circuit to make a small motor pulse on and off. I am not constrained to a certain on off period. Something like 2 seconds on, 1 second off, it isn't critcal. I would like use small 3 v batteries. I am very new to electronics, I would appreciate any ideas anyone has for an ideal circuit or components. Thanks.

 

[mramos1]

Maybe a 555 timer circuit, google for that.

How small is a small motor? You might need a transistor to drive it.

 

[Chipper]

I was looking at using a very small motor, a little bigger than a finger nail. I have bought a kit with one of those 555 chips, they require a few compnents to make the circuit, so I wonder if there is a smaller circuit. I wonder how they make mobile phones vibrate, they may use a motor to pulse on and off to simulate the vibration alert.

 

[Dr_Doggy]

555 timer is easiest/best to use

 

[mramos1]

I was looking at using a very small motor, a little bigger than a finger nail. I have bought a kit with one of those 555 chips, they require a few compnents to make the circuit, so I wonder if there is a smaller circuit. I wonder how they make mobile phones vibrate, they may use a motor to pulse on and off to simulate the vibration alert.

Normally they have an out-of-balance weight on the motor shaft to make them shake.

 

[Chipper]

Do you think they would use the 555 circuit in mobile phones to make the phones vibrate. Would they have smaller components that I could purchase to make a small circuit

 

[mramos1]

Do you think they would use the 555 circuit in mobile phones to make the phones vibrate. Would they have smaller components that I could purchase to make a small circuit

I doubt there is a 555 in there. The 555 was to your original question on turning a small DC motor on and off. To make it vibrate, you just add a small weight to the motor shaft, when it spins it will not be balanced and vibrate.

 

[Grossel]

Or maybe using a 555 as a multivibrator and connect a H-bridge between motor and 555 output to make it shift direction every half second, or even faster. But it may tear the motor quicker than a weight on the shaft.

 

[Dr_Doggy]

cell phones have micro-computers to control the motor, you are looking for what is called a flasher circuit, here is alot of good ones, i think i seen a super simple one on the page!

Flasher Circuits

 

[Chipper]

Thanks. I'll look into these options and let you know how I go. Cheers

 

[Dr_Doggy]

btw, the motor doesn't shift direction

 

[colin55]

Look up what "chipper" means in Polish.