using an audio sig to operate a switch?

[[email protected]]

Hi i was wondering how I could use an audio signal from the earphone
outlet of my metal detector to operate a small 3 volt vibrator?....so
as to feel the signal rather than hear it?

 

[Mark Little]

Hi i was wondering how I could use an audio signal from the earphone
outlet of my metal detector to operate a small 3 volt vibrator?....so
as to feel the signal rather than hear it?

If you rectify the audio with a small signal diode, you can use that voltage
to drive a transistor that drives the vibrator.

I'm not into metal detectors, but don't they give an increasing signal as
the metal comes closer to the head? If so, you may have a bit of a problem
keeping that sensitivity. A vibrator will probably go from off to on in a
narrow voltage range so may not get the same performance.

regards,
Mark

 

[amstereo-matt2]

wo8uldn't a vu guage work better (LED or pointer)

 

[Bushy]

Try hooking it to those backpack thumper subwoofer base speaker things that
Jaycar has been trying to get rid of for years.

Peter

 

[Doug Laidlaw]

** You need to hear the tone to make judgements.

What a dickhead and another Hotmailer !!!




................. Phil

The point about the tone may be valid, but was the comment called for?

If you have the vibrator, the suggestion of a diode and transistor should
operate it, but I can't comment on the qualifier.

Doug VK3KDI.

 

[[email protected]]

Thanks for the answers...you can get a meter for the detector but they
are quiet expensive...My mrs is deaf and can't hear the signal....so
it was just a thought that for little cost she may be able to share
the hobby...thanks

 

[Rob Judd]

If you rectify the audio with a small signal diode, you can use that voltage
to drive a transistor that drives the vibrator.

I'm not into metal detectors, but don't they give an increasing signal as
the metal comes closer to the head? If so, you may have a bit of a problem
keeping that sensitivity. A vibrator will probably go from off to on in a
narrow voltage range so may not get the same performance.

He could attach the vibrator to his dick ...

R