Recommendation for piezo buffer op-amp
- Thread starter yeahtuna
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Yes I am aware about this option
But I kinda like it and don't want to open it and "steal" your design, I purchased it to use, not to hack. I just thought sinse there are some kind people who helped you with chosing write components you could share with the results. I know about firmware magic but don't want to even try to implement positional sensing or hot spot supression, just simple piezo triggering.No I don't have it. My intension was to make it as simple as possible, but it looks like it is time do it (oscilloscope).
A good opamp is the mcp6004. Programming in your own oscilloscope will be infinitely more useful than buying a hardware unit. The eDRUMin UI shows the waveform allowing me to really see what the device is seeing. Without that information I would have a hard time seeing problems in my transient detection and alignment.
mborgerson
Well-known member
A friend asked me to look over the Analog Devices LTC6240 for a piezo-base oceanographic shear sensor. That op amp looks very good for piezo sensors because of the very low input bias currents--in the 1picoAmp range.
https://www.analog.com/media/en/technical-documentation/data-sheets/624012fe.pdf
https://www.analog.com/media/en/technical-documentation/data-sheets/624012fe.pdf
I plan to use the same Opamp, but have not tested them yet. I`m only concerned about the 18 MHz Gain-Bandwidth product that limits the achievable gain somewhat. But for a Pre-amp it may be OK.
LTC6240 looks nice, but I couldn't find it anywere in our local stores. But I found MCP6022T wich is much like MCP6004 but has better slew rate, wich may be important in piezo sampling.
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