How much pressure should I have on the my peizo? I have mounted it under the bridge is a groove cut into the top of the guitar. its about a 1/32 proud of the face, and is compressed that much when the bridge is screwed down directly over it.

The reason I mounted it like this was that I recalled reading that some pressure enhanced how a peizo works. Could be the opposite.

I'm not getting much sound from the peizo, is this normal?

have I broken it?

It will be hard to replace since the box is epoxied shut!!!

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Replies to This Discussion

Ramson, I assume you're talking about a rod piezo rather than a disc? Second question, are you running it through a pre-amp? My understanding (limited experience with them at this point) is that the rod piezos need a pre-amp. Either way though, you need a good connection to transmit vibration from strings to bridge to piezo.

I agree. I also have limited experience with piezos.

 A rod ?  Too much compression can actually pinch and squish the rod resulting in diminished sound or killing it completely , you may be able to "un mash" squashing it the other way  . or if it is cut , using a pin or nail to get the outer layer away from the inner contacts.  you may also just have gotten a bad rod .

ps .. rods are "better" with a preamp , but not "necessary". 

IF you need to get into the box again ,  you can try  heat  to unglue it .  or cut and access in the back , and   make a plate to cover it afterwards.

 or ,if you don't wanna do any of that ,   get a surface mounted piezo  , like the "bonehead " . Shane Speal cbgitty sells em . 

Check this out for explanations: ehomerecordingstudio.com/best-acoustic-guitar-pickups/
Pre-amp are necessary, if, for example, you're playing with other instruments. I'd suggest trying just adding a round piezo on the body. If the box is giving good resonance, that vibration can be even better than bridge piezos (which are mostly getting vibration from strings alone.) Whether you connect both together, or make a switch... well possibilities are endless. I think maybe "pressure" is better when talking about transference from strings. 2x pressure is 4x volume. Overall pressure on the piezo- I don't know, actually.

Hi Ransom, I'll just reinforce and add to these comments, but first a tip.......

When building instruments it's a good idea to make things easily reversible. The use of epoxy glues for assembly is a no no in my workshop. It will come apart but in my experience takes far more heat than other glues.

The best position for a strip or rod piezo is under the bridge saddle, closest to the strings. 

The bottom of the slot for the p/up should be perfectly flat

The contact surface on top of the p/up has to be perfectly flat, so as to exert equal pressure on all pezio  crystals.

The pickup strip is not normally one long length of pezio crystal but a small " patch" for each string location.

If the string is not in the pezio " window" sound will suffer.

It does not take much to make a strip pezio pickup to fail, or underperform. I think I've worked them all over the years

Even the pinching of the strip in its slot, and the bowing of the top from weather/timber changes.

good luck Taff

Because I dont have a amp, I was testing the guitar with rocksmith on my ps3. I had forgotten that you need to calibrate the game when you change instruments. The result of not calibrating happens to be low volume output. Once I calibrated the game to the guitar everything worked fine. 

It's a rod peizo and its mounted directly under the saddles on the bridge right were the adjustment screws for string height contact the bridge.

Thanks for all the replies. 

;-)

'

Glad you got it sorted. Now look at all the extra info you have for your next build. ha ha.

Taff

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