![]() ![]() and the fact is most active preamps in acoustic guitars suck or have too wide of sweeps to be effective unles you spend hours and hours mastering your particular system. again paul this isnt' a stab man my main point is that so many times diy sounds better cause we take the time instead of the almighty dollar so we let our ears be the judge instead of our pocketbooks. ![]() and pluggin my active jackson into the same booster set for again unity still helps it sound so much better. but plugging my passive strat into a booster set at unity makes it sparkle so much more. but unless your guitar was pickup less the piezo was working the same before you built the new preamp now i am sure it helps it out without a doubt cause hearing is believing. adding a preamp obviously amps it up and eq's it which means the pickup isn't working as hard. i mean has anyone put a piezo in there guitar and plugged straight in with no preamp. and i gutted it and put my own circuit inand its a lot more responsive. ![]() ![]() I had a fishman that everyone was like thats great its the best. Have you ever thought of just tweaking the onboard preamp to your liking. Whatever the case, it sounds a lot better with the signal going thru the buffer and on to an electric guitar amp than otherwise. Above all, I am having trouble understanding how the source resistor affects the frequency response. I haven't tested this thing extensively, but it sounds real good to my ears with a 10 foot long cable. I'm not versed enough in frequency response and roll-offs to say one way or the other, but I would think that the output cap size of the circuit would have more to do with the frequency roll-off than the cable capacitance would. Current drain would still be less than 0.25mA, so still very good battery life.Īs you can tell, Im interested in this theory but I am not an electonics engineer, so I am grateful and interested in any corrections to the above. My understanding is that a circuit like that would work just as well with say 22k there, in which case the roll off would start at 9000Hz, which is above guitar frequency range. Guitar cables of say 20' can have a capacitance of 600-800pF (based on 30-40pF per foot), so if 220k was the output impedance, then treble roll-off could start at a frequency as low as 900Hz. With your circuit with the high 220k resistor, I am not sure exactly what the output impedance would be, but it would be at least closely realted to that 220k value. The concern I have is that this would raise the output impedance. I find the usual types of buffers such as Tillman, and the versions Ive built to be very good at fixing this by lowering the output impedance of the guitar. What I was concerned about was roll off due to cable capacitance. I thought this might help someone here at the forum, so I thought I'd share it with y'all. Could be pretty handy for Parker Fly owners. Now I have an idea to combine this buffer circuit with my stereo splitter box for an all in one unit. Piezos need to see a very high input impedance, so the FET satisifies this requirement and the output impedance is more along the lines of a stompbox, so it drives things made for electric guitar pretty well. It actually sounds like an acoustic guitar when plugged into something designed for conventional magnetic pickups. I used it this morning for about an hour and I must say that it makes a huge difference with my Parker Mojo Nitefly's piezo pickups. It won't substitute for an amplifier that is designed specifically for acoustic guitars, but it does make one sound a whole lot better when plugged into a regular guitar amp. It should work well with any instrument that has a piezo - from bass to violin. It really works pretty well and is very easy to build. Tagging u/Wavestate-Prests because they seemed interested.I built this little gizmo to try out with my acoustic-electrics and my Parker Mojo Nitefly. I don't know much about Piezo pickup systems, and for all I know, these techniques and devices may have not positive effect on a Piezo system.īut what you describe-the noise going away when touching the grounded side of the jack-is the classic technique to find-out if your guitar needs a "string-ground" connection. Now, these Taylor-related videos and articles seem to be geared toward noise problems associated with magnetic pickups. Here's a message from Taylor Guitars (which I didn't find super-helpful): This fellow discusses another method of making a string-ground connection on an acoustic guitar: The reason I'm not recommending that method is because firmly attaching that player to ground can be a shock hazard, under certain circumstances (as is covered on that linked page). With this first link, I'm not recommending the method illustrated in the pic on this page (about half-way down the page), but I'm offerring it an example: ![]()
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