 Experiments with piezos
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DrZoidberg
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Registered Member #350
Joined: Mon Mar 27 2006, 05:14PM
Location:
Posts: 106
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I tried the speaker idea now..
I used a piezo speaker as input and one of the big crystals as output.
Resonance frequency: 114 kHz
Input voltage: 8 V
Input current: 20 mA
Output voltage 6 V
Output current 70 uA
It just isn't working.
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robert
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Registered Member #188
Joined: Thu Feb 16 2006, 05:18PM
Location:
Posts: 67
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I got my spare parts for the function generator yesterday and so i tried some stuff with the piezos.
The self-resonance at around 115khz is very weak, maybe because the sig gen was coupled to the piezo with too low a resistance (1k).
When tapping a piezo with a screwdriver, the output is a very odd-looking waveform with very high peaks in the hundreds of volts.
If i only had a working pen plotter i could print out the captured waveforms and scan it.Taking photor right off the CRT results in trashy image quality.
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Madgyver
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Registered Member #177
Joined: Wed Feb 15 2006, 02:16PM
Location: Munich, Germany
Posts: 214
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the 115khz resonance is mechanical resonance only. You have to build an LC circuit with an Inductor to get electrical resonance at 115khz.
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Electroholic
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Registered Member #191
Joined: Fri Feb 17 2006, 02:01AM
Location: Esbjerg Denmark
Posts: 720
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