A about two years ago I put a piezo element in my acoustic guitar and built a preamp for it using a LT1012 Op-Amp. It has sounded decent but I really think blending in an electret condenser mic would really add to the sound. As I see it I have three options: (or four if you have a beter one...)
1) Keep the piezo circuit the same and add a passive blend circuit w/pot and mic.
2) The same as 1) but with an active blend / buffer amp.
3) I could design a new high impedance blend circuit (greater than 1M ohm, because of the piezo, although ideally there'd be around 10K resistance on the mic...); then run the combined signal into my existing preamp.
If ya'll audio gurus could give me some opinions and and direction on this project I'd appreciate it. The Mic is a panasonic wm-61a electret, and the piezo disc is just a little 20mm disc I had laying around. I'd love to keep the power cunsumption as low as possible as well as running off of only one 9V. I have two holes is the guitar for rotary controls, I'd like one to be blend, and the other master volume.
I've been lurking around here for a while and have gained A LOT of good information from everybody here, but I couldn't find anything in the archives that was able to help me make these decisions. So, here's my first post! (a few additional keywords for future searchers: preamp summing combine schematic potentiometer pot volume )
1) Keep the piezo circuit the same and add a passive blend circuit w/pot and mic.
2) The same as 1) but with an active blend / buffer amp.
3) I could design a new high impedance blend circuit (greater than 1M ohm, because of the piezo, although ideally there'd be around 10K resistance on the mic...); then run the combined signal into my existing preamp.
If ya'll audio gurus could give me some opinions and and direction on this project I'd appreciate it. The Mic is a panasonic wm-61a electret, and the piezo disc is just a little 20mm disc I had laying around. I'd love to keep the power cunsumption as low as possible as well as running off of only one 9V. I have two holes is the guitar for rotary controls, I'd like one to be blend, and the other master volume.
I've been lurking around here for a while and have gained A LOT of good information from everybody here, but I couldn't find anything in the archives that was able to help me make these decisions. So, here's my first post! (a few additional keywords for future searchers: preamp summing combine schematic potentiometer pot volume )