This might sound like it decreases the sensitivity but the voltage output level of a piezo depends highly on the frequency spectrum of a push and the load impedance. Thanks in advance, I'd be truly grateful if you can help me out.Īt first sight, I would say the \$1k\Omega\$ resistor is used in combination with the \$560k\Omega\$ resistor as a voltage divider. Why this gap? This resistor has an effect on the sensitivity, I can more or less guess why but would you like to explain it for me?Ĥ) At last the main question: How to improve the sensitivity of the circuit? Is it the case? The assembly is working for a resistor of 250 kΩ (and even less but requires high pressure) to 600 kΩ (perhaps a bit more). Do you have any suggestion?ģ) The resistor of 560kΩ plays the role of a pull down resistor for me. I’ve added a Schmitt trigger right after the op amp on this purpose but I have the feeling that the sensitivity has reduced somehow. Why not a negative pulse? I’d like to get rid of this second pulse that occurs when I maintain the pressure and then release (for brief pressure it doesn’t occur). Why?Ģ) When I squeeze the piezo (a pulse is generated) then maintain the pressure for some time and then release the piezo generates a positive pulse. I have some questions in regards of the circuit that I don’t quite understand.ġ) I used to have a resistor right before the diode as you can see on the following illustration, but I got rid of it because it appears to be irrelevant. However it generates within the assembly 50mv (for low pressure) to 1V (for high pressure) Piezo film: don’t ask me about it, I don’t have any information. Some information regarding the components: Here is the assembly put in place and it’s working (fortunately): I have to flash an LED using a piezo film. I have a project to carry out dealing with piezo technology. And also I’m kinda a newbie in terms of electronics so go easy on me please, I will try to be as understandable as I can. First and foremost I’d like to warn you that I’m not a native English speaker.
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