Piezo element to Speaker
hey all,
so question won't involve arduino directly. new electronics , wondering how can connect piezo element speaker (like car speaker).
my speaker 8 ohm (i'm not sure how many watts, maybe 10?) , using 27mm piezo element. don't know if can use this, have 5v 10amp power supply older project: https://www.amazon.com/snanshi-10a-switching-supply-transformer/dp/b00xyynb78/ref=sr_1_2?ie=utf8&qid=1468406331&sr=8-2&keywords=5v+10a+power+supply
basically want piezo pick contact sound vibrations , feed signal directly speaker, potentiometer or control volume. assume need kind of power source or amplifier make work. looking cheap because making around 50 of these!
any advice appreciated while own research! thank much!
so question won't involve arduino directly. new electronics , wondering how can connect piezo element speaker (like car speaker).
my speaker 8 ohm (i'm not sure how many watts, maybe 10?) , using 27mm piezo element. don't know if can use this, have 5v 10amp power supply older project: https://www.amazon.com/snanshi-10a-switching-supply-transformer/dp/b00xyynb78/ref=sr_1_2?ie=utf8&qid=1468406331&sr=8-2&keywords=5v+10a+power+supply
basically want piezo pick contact sound vibrations , feed signal directly speaker, potentiometer or control volume. assume need kind of power source or amplifier make work. looking cheap because making around 50 of these!
any advice appreciated while own research! thank much!
typically you'll need 2 amplifier stages. a preamplifier boost "microphone" signal audio line level (about 1v) , power amplifier drive speaker.
you need experiments... don't know how signal you're getting out of piezo or quality of signal , don't know how amplifier power need.
do have oscilloscope? multimeter? if vibration continuous can measure voltage piezo meter. if you've got short-duration "pluses" meter won't respond enough you'll have use trial-and-error unless have oscilloscope.
or have got guitar amplifier? piezos high impedance , guitar inputs high impedance, it's pretty close you're looking for...
your computer's soundcard has microphone preamp. try plugging piezo computer , record it. impedance of mic input too-low piezo , knock-down signal. if vibrations & signal strong enough, may useful can listen to.
the next step build high-impedance preamp. you can build amplifier (preamp) an op-amp , 2 resistors. non-inverting amplifier naturally has high input impedance, , you'll need 1m - 10m resistor + input ground "hold" dc input/output @ zero. op-amps need plus , minus power supplies , need 0.1uf bypass capacitors (phsyically-close chip) between power supply connections , ground.
we have no idea how gain you're going need you'll have experiment resistor values. you may not need voltage gain... may need buffer (for it's high input impedance). that doesn't require resistors (except high-value resistor ground) , that's show on same page.
assuming don't have power amplifier, again record vibrations computer see if want.
there audio power amplifier chips if want build one. but before that, buy 1 see how it's going work , idea of how power need. i have this handy little amp (this particular 1 doesn't come power supply have buy 1 separately.
you need experiments... don't know how signal you're getting out of piezo or quality of signal , don't know how amplifier power need.
do have oscilloscope? multimeter? if vibration continuous can measure voltage piezo meter. if you've got short-duration "pluses" meter won't respond enough you'll have use trial-and-error unless have oscilloscope.
or have got guitar amplifier? piezos high impedance , guitar inputs high impedance, it's pretty close you're looking for...
your computer's soundcard has microphone preamp. try plugging piezo computer , record it. impedance of mic input too-low piezo , knock-down signal. if vibrations & signal strong enough, may useful can listen to.
the next step build high-impedance preamp. you can build amplifier (preamp) an op-amp , 2 resistors. non-inverting amplifier naturally has high input impedance, , you'll need 1m - 10m resistor + input ground "hold" dc input/output @ zero. op-amps need plus , minus power supplies , need 0.1uf bypass capacitors (phsyically-close chip) between power supply connections , ground.
we have no idea how gain you're going need you'll have experiment resistor values. you may not need voltage gain... may need buffer (for it's high input impedance). that doesn't require resistors (except high-value resistor ground) , that's show on same page.
assuming don't have power amplifier, again record vibrations computer see if want.
there audio power amplifier chips if want build one. but before that, buy 1 see how it's going work , idea of how power need. i have this handy little amp (this particular 1 doesn't come power supply have buy 1 separately.
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