![]() ![]() In fact, adding a volume pot won't exactly eliminate the screeching, it will just allow you to reduce it. I'm incredibly experienced with piezo, without a feedback loop, there would be no screeching. Turntables can suffer from acoustic feedback thanks to the sympathetic vibration of the various mechanical components - ending with a vibration that is translated by the cartridge into electrical signals. It can manifest itself in other forms, too. ![]() Acoustic feedback is the same, except the feedback occurs thanks to sound pressure waves rather than wires. *Positive* feedback causes a growing amplitude signal to occur until certain electrical limits are reached. This loop is conceptually the same as oscillation in an electrical circuit. If the sound waves produced by the speaker happen to cause the diaphragm of the microphone to move, a feedback loop can occur. If this signal is amplified substantially and fed into a speaker, the speaker converts these electrical signals back to pressure waves (sound) via the movement of the voice coil, cone, etc. The diaphragm of the microphone moves in response to pressure waves (sound) and induces a current in a coil of wire that is proportional to that movement. The most simple form, and easiest to understand, is the acoustic feedback that can be produced by a microphone. Just to be clear, the two signals are: piezo => piezo volume => output jack single coils => single coil volumes, selector and tones (standard sss wiring) => output jack With "output jack" being the same for both.Any device that converts motion to electrical signals can be subject to acoustic feedback. Why is that? I thought that by connecting the two circuits to the same output, they would be in parallel, but they are clearly interfereing with each other. So far, so good right? Well, I tried to do this and simply solder the wire and ground wire for both the magnetics and the piezo to the same output jack, but when I close one of the volumes, the other one shuts down as well. Now, my idea is to put the piezo under the neck pickup cavity, have its own volume on the scratchplate and then go to the SAME output jack as the single coils. My goal is sensing both body and strings vibration, imitating the "magic button" in ronin guitars, so I purchased a 3 cm piezo disk with a volume pot. Hi all, I have a beautiful deluxe sss strat to which I would like to add a piezo element. That way you can have the impedance matching, level matching, EQ, and compression all outside of the guitar, and not have to worry about cramming all of that inside the guitar. ![]() Then you can combine them outside the guitar and before the amp. Though the best option would be to just keep the two on entirely sperate outputs, as a piezo pickup from a guitar can usually benefit from some compression as well. That's often useful because a piezo tends to sound pretty brittle on it's own when fed through a standard guitar input, even with impedance matching preamp circuitry. This will also be a good place to add some specialized EQ circuitry for the piezo. That way you get the level and impedance right through the active circuitry to match the level of the other pickups. The best way to set this up is to use an active preamp for the piezo. The switch helps because it cuts the pickup out completely, whereas a pot will just increase the resistance. What's likely happening is that the piezo is seeing the guitar pickup as having a significantly lower resistance path than the input of the guitar amp, and is feeding the majority of the signal through the pickup instead of through the amp. So a piezo pickup will probably require a preamp to get it up to the same level as a regular guitar pickup. The impedance of a standard guitar pickup is on the order of around 10 kilo ohms. That's about the same as the input on your guitar amp. ![]() The impedance of a piezo pickup is going to be on the order of about 1 mega ohm. With "output jack" being the same for both.Īny help on this would be extremely appreciated! Single coils => single coil volumes, selector and tones (standard sss wiring) => output jack I have a beautiful deluxe sss strat to which I would like to add a piezo element. ![]()
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