Difference between revisions of "Using a piezo element as a contact mic"
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| − | The 220 resistor can be varied, for more | + | |
| − | The 3.3M can be replaced with a 1M resistor which is easier to find.. | + | (The 220 resistor can be varied, for more or less gain. |
| + | The 3.3M can be replaced with a 1M resistor which is easier to find...) | ||
Revision as of 13:23, 30 June 2015
If you want to record or amplify the sound vibraitons from a surface, you can use a piezo element as a contact mic.
However, do not hook them up directly to other audio equipment! There can be harmful high voltage spikes.
A simple and o.k. preamp to use is this one from collins lab
If both sound quality and equipment safety is not your greatest concern, a very simple solution is this one
If you want to hook it up directly to a speaker:
(The 220 resistor can be varied, for more or less gain. The 3.3M can be replaced with a 1M resistor which is easier to find...)