make your own, if you can sacrifice some efficiency it doesn't have to be a gearbox, you can do more or less same with a belt and pulleys (any old tape recorder or vcr will have them)
there are several h-bridges in small packages: L239D (and not the L293 which needs external diodes) and SN 754410. Both of those will more than drive your motors. You might even be able to use 74HC series logic if the current is low enough (<30mA) but you will need diodes to prevent back emf.
Or you could build your own hbridge with transistors and diodes.
If the parts were purchased in the US, you would spend no more than a couple of dollars.
How would you install back-EMF preventive diode for the motor?
I understand that usually, if the motor is only one directional, a flyback diode is installed across motor leads in parallel to the motor. Hence the motor and the diode forms a closed loop. Diode will be reverse biased with respect to the circuit so that no current is leaked into diode when motor is operational.
But when motor is designed to move both direction, how would this simple flyback diode design work? In one direction of current or the other, current will go through the diode instead of the motor.
A comment on this:
I found several identical of one toy (they hand them out at McDonalds, so they're not very sought after). So I had a couple to spare and decided to experiment. I glued the motorshaft directly onto the output shaft of the old wind-up clockwork, and removed every other flywheel from the gearbox.
The word "buzzer" comes from the sound that particular device makes. If you listen to a buzzer it says "buzzzzzzzzz". Everybody knows this.....
Bearing that in mind, what I made cannot be called a "buzzer". The correct name of my shortlived contraption would be a "click-snap-weeeeeeeeee'er"
I've actually come up with an idea about reversing the original gearbox. Turning it upside down, it will fit inside the body with only minor modifications. The weight of the removed tension spring is more than the weight of the motor, so I'm happy.
Could you show me how you used the nosepliers to remove the weight? So far I've ripped out the entire shaft on two and cut it right of on a third motor... -So a walk-through with pictures would help.
it can't b shown through the pics but
hold the weight tightly and pull it out ,u have to work forcely
but take care of the motor
i will show the pic of the motor i got it from my cellphone n2300
*giggle*
That picture was rather ..... errrr ..... pooh?
I tried the vice yesterday, that didnt work. But, then i put a Lineman's plier into the vice, and put parts of the weight into the cutting part of the pliers. And that worked like a charm. So today I'm gonna do the same with the rest of my vibramotors.