Vibrating device

[swmomark]

I am looking for a circuit to build a device that will vibrate when I get a signal on my underwater detector. I am wanting to use it instead of head phones. Any help would be appreciated. Thanks, Mark

[Carl-NC]

An obvious answer is the little vibrating motors that are used in cell phones. They cost $1 from surplus houses. However, they don't have a whole lot of vibration, certainly not like the old bone knocker headphones that u/w detectors used to have. If you can place the vibrator right against the skin it might be enough, though.

- Carl

[swmomark]

I know there are probes that respond with a vibrator. And at least one underwater detector that gives you a vibrating response. Only problem with them is they are PI circuits. Didnt know if I could just hook up a vibrator from a cell phone, example, instead of the headphones or if I was going to need some additional circuitry to power the vibrator. I am wanting to put on a VLF detector. I would put vibrator inside the houseing.

[Max]

I know there are probes that respond with a vibrator. And at least one underwater detector that gives you a vibrating response. Only problem with them is they are PI circuits. Didnt know if I could just hook up a vibrator from a cell phone, example, instead of the headphones or if I was going to need some additional circuitry to power the vibrator. I am wanting to put on a VLF detector. I would put vibrator inside the houseing.

Hi,
it's not important which kind of Md it is... it will provide an output right ?

Ok... the vibro-motor for cell phones is powered usually at 3V (even less) ... anyway 3V are usually enough for it, you just need an adaptor that converts the audio signal (or visual) of your MD to the supply required for the motor... just that.

In case of motion detector it could be necessary adding a small monostable (i.e. 555 circuit) to have say min. 0.2 seconds of triggering of vibro... otherwise some will not be so responsive to immediately start and you'll lose depth.

Just a transistor... maybe a monostable, output stage and vibro.

Kind regards,
Max

[swmomark]

Thanks

[chemelec]

Wouldn't a Flashing LED be Easier?

[Max]

Hi,
yes, right...

me too thought the same...an hi-power pulsating led... much better and in the dark of deep water too...

BUT...

then I realized that usually is better... in some cases the operator needs be silent...

I mean... suppose you wanna use that in the water of Alexandria, Egypt at night....and without any licence to do such kind of activities there...

I think silent is better in such, like above, cases... like navy seals!

But could be other (and good) reasons for that too, like you don't need to look at device direction all the time... and underwater is important having such freedom.

Kind regards,
Max

[Esteban]

You can select both mode:

[kt315]

Mark, you may take the vibromotor from automax precision pinpointer (or what p-p you could find around from...). put also some part with Zener diode, capacitor and transistor. voltage of the Zener you may calculate from your conditions...

regards