Hey gents -
I'm just finishing up my second build and spent a good part of the day messing about with a disc piezo. The wires that came off of them are extremely thin and today had me:
1) Installing one between 3M tape and then to the inside of the box under the low string, right below the bridge only to find I crushed the ceramic disc after pressing it between the foam tape. I read of this method on a blog...
2) Installing it in a bottle cap (looks very cool), but the solder joints on the thin piezo wire failed. Followed a YouTube video for this one (filled the cap with hot glue, etc.)
3) Tried the bottle cap method again because I liked the look of it so much, got my wiring sorted out (finally) and plugged her in, but...
Is it normal to have to really crank up the volume to get any decent sound from these pickups? I have mine mounted in the cap, surrounded with hot glue, no voids and then glued tight to the inside of the box, right below the bridge on the lowest string.
I know setups are subjective, but for comparison, my first build has a mini-humbucker and I can turn my little Fender tube amp to about 2 in the living room, v/c on the guitar full on, and she throws some good sound.
With the disc piezo, v/c full-on, I had the amp to 4 and it sounded 'ok' but kind of anemic... definitely not fired up about the sound. Also, at '4', theres noticeable hum.
Am I missing something? Expecting too much?
I'm tempted to scrap the piezo and put a mini-humbucker in there; the unfortunate part is that I put a sound hole / screen near the top front corner, so the new pickup could only go dead-centre where box art is - shame to cut that away.
If I am expecting too much from this round piezo, how does a bridge piezo compare? Can this setup be saved?
Thanks.
Mike
P.S. I'm running CBG 4-string Acoustic .034 - .013 with a wood bridge with bone.
Tags:
Thanks Taff -
What you're suggesting makes perfect sense.
The photos I posted originally were without a bridge as my bridge took a trip through my jointer (don't ask).
I've since created a new bridge (see attached) and put a thin smear of hot glue to the back side of the piezo and mounted it beneath the bridge under the lid - that made a world of difference.
Again, I'm puzzled as to how some cats are getting the 'glue in the bottle-cap' method to work. The only thing I can think of is to fill the cap with hot glue and then rest the pickup in the 'pool' of glue while making sure the back side is flush to the edges of the cap. This way, when placed against the box the disc makes contact.
If this is a feasible solution, I can't really see what purpose the cap would serve aside from aesthetic.
Anyway, I did get it sorted. Here's a quick test drive with my second build to show the sound... not bad considering it's a little 9V, 4" speaker.
https://youtu.be/GCmZ1oqJA9M
Cheers -
Mike
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