I would like to join the discussion on pots and piezos.
I've had a fair amount of wiring experience with humbuckers and single coils
and switching them.
Now my question is' which value of pot is better with a disc piezo?
...250K or 500k .....and how much
loading will each one have on the piezos (2 in parallel)?
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And finally, this is the first time I've heard mention of running two piezos parallel?
You say it makes them sound better. Is there any info on wiring schematics and other tips for using multiple piezos on a single instrument? If so, where?
thanks so much,
KK
I've used pairs of piezos quite successfully. Someone whose work and views I respect greatly on this sort of subject is a guy called Bart Hopkin who is a mainstay of the Experimental Musical Instruments website. His interests cover all kinds of instruments - guitars being only an incidental part - but in amongst his writing is material that can provide insight to guitar builders.
Here are a couple of links to articles about use of multiple piezos:
http://windworld.com/tools-techniques-ideas/another-important-consi...
http://windworld.com/tools-techniques-ideas/piezo-film-pickups-how-...
Incidentally, two piezos in parallel don't necessarily have half the impedance. Although impedance is expressed in ohms, the same units as resistance, it is a more complicated phenomenon than resistance. When you are dealing with alternating currents - such as you get with pickups and other audio applications - you move into the territory of complex numbers when working out the effect of combined impedances.
KK Dirty Money said:And finally, this is the first time I've heard mention of running two piezos parallel?
You say it makes them sound better. Is there any info on wiring schematics and other tips for using multiple piezos on a single instrument? If so, where?
thanks so much,
KK
Thanks Mark. I've known about phasing on humbuckers and how they work and how some guys flip bar magnets end over end 180 degrees to get the nasal out of phase sound on 2-wire humbuckers, but this phasing phenomena with disk piezos is new territory for me.
I've read and bookmarked the links you supplied.
I'm sure that if you could use a 440hz tuning fork on the acoustic
top with the piezos mounted and an cheap oscilloscope using a x-y lissajous figure, the
phasing of each piezo is easily seen and matched...but that requires a cheap audio scope
or facsimile to display the horizontal input and the vertical input.
This is a very interesting discussion, as I'm starting to learn about the ins and outs of wiring up CBGs.
Are these 250Ks and 500Ks used for volume, tone, or both?
Do people use tone knobs on CBGs very often? Does it matter that much with a piezo?
And finally, this is the first time I've heard mention of running two piezos parallel?
You say it makes them sound better. Is there any info on wiring schematics and other tips for using multiple piezos on a single instrument? If so, where?
thanks so much,
KK
I'm sure this question has been asked before, but...how do you affix the piezo disks to the CB top?
Do you use a hot glue gun or use a wooden brace to hold them in place against the top?
I'm sure this question has been asked before, but...how do you affix the piezo disks to the CB top?
Do you use a hot glue gun or use a wooden brace to hold them in place against the top?
Thanls, I used titebond on the bottom of each piezo and a thin pine rib to hold them in place.
Got my wiring done this morning and now I've glued the CB to the neck. Once that dries, I'll
take care of any gaps with some epoxy and wood strips.
I wired up the SC (CB Gitty) to a 3 way mini-toggle (ON-ON-ON) to replicate the 3 ways switch on
most of my guitars with a 250K volume and a 250K tone pot (.033uf cap) for starters.
On1 = neck Sc center on = mix On2 = piezos
I noticed through the tap test that the SC and piezo (in parallel) (center on),
seems to drop down the volume a bit.
Do you or does anybody know, if I need to insert a series "isolation resistor" of 100K to try
and isolate the SC and piezos from loading down each other?
MichaelS said:
I have used thin doublestick mounting tape on some of mine, I also used some foam tape but the thin tape was louder. It also picked up more 'noise" (hand movement shirt rubbing etc.)
carverman said:I'm sure this question has been asked before, but...how do you affix the piezo disks to the CB top?
Do you use a hot glue gun or use a wooden brace to hold them in place against the top?
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