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piezo sensor

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RFERNANDEZ

New Member
Guys,

I would like to build a circuit with a piezo sensor the when vibrated it will turn ON a load of 1 amp or so.
I am experimenting at this time with 2 different piezo elements so I do not think the amplitude is important. I know that the elements on a scope generate voltages ranging from 10mV to 100mV at least. When this voltage is being generated I want to switch up to 1 amp 12VDC @ 1 amp 120VAC (2 diferent circuits).
I have looked for simple circuits to do this but can not find any.
Can you help me out

Thanks
 

evandude

New Member
use an op amp to buffer and amplify the signal as needed.
then feed that into a peak detector (as simple as a diode, capacitor, and resistor - also called an envelope detector)
then feed that into a comparator, and adjust the voltage threshold so it triggers with the desired amount of vibration.
then use a transistor on the output of the comparator to switch a relay on and off, which will switch your big load.
 
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