HI all. Im about to intall a rod Piezo in a new Build, I have installed them before some with volume Control some without. Is the only benifit that you have Volume Control on the Instrument rather than on the amplifer?

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That's about it...really for convenience of adjusting volume on guitar instead of reaching for the amp every time.

Thanks Scott, on this one i will keep it simple. I have another question, re the Volume and Töne Pots. Should they be of a specific Size/Value and what would the consequence of mixing different Töne and vol pots?

Piezos are other member's specialty...I used to install them years ago, but only use mag pickups anymore.

As for volume/tone pot values with piezos, I believe other builder/members use anything from 500k to 1Meg pots for either position.

Yes, i understand that the mag Pickups are the better option and would normally go that Road but in this case i have converted a drum into a Banjo style cbg and just Cant work a mag Pickups in . From preliminary Testing it may not need any but thought while its in the Production Stage I would put one in anyway.

A tone pot with a piezo is not really worth the effort Jeff, not much,if any, effect, but you can soften the piezo harshness a bit by putting a capacitor across the contacts at the jack, there's a blog somewhere regarding that, i think it was a 0.01uf capacitor by memory

Hi Daryl,

Pardon my ignorance, but why does adding that capacitor across the + and - lugs of the jack soften the output of a piezo? I'm new to the CBG thing, haven't built any yet, doing research while waiting for parts from Amazon.  

Rick, Scott has answerered your query, probably better than i might have

Darryl, thanks for the reply. I didn't see the significance of Scott's reply until I re-read it. It's the filtering aspect of the capacitor that makes the difference. If I understand correctly, it would act something like a tone pot. 


Capacitors can be used for many applications. In tube amps they are used to filter out 60hZ hum from the DC power found inside the circuit powering the plate/screen/cathode of the tubes/valves.

Capacitors are also used to isolate that high voltage DC power to those locations.

One interesting note: AC and DC power can exist on the same wire without affecting each other. But only AC can pass through a capacitor, DC cannot.

And they are used to filter off certain frequencies of the AC signal (from the guitar) to ground.

A low value capacitor will affect high frequencies...high value affects lower ones.

So adding a low value capacitor on the guitar's 1/4" jack will take some of the high/harsh frequencies of the pickup signal (which is AC), and pass them to ground, thus allowing more of the good stuff to continue to the amplifier.

Scott, thanks for the reply. I'm not very savvy when it comes to electronics, but I'm always willing to learn. I appreciate your time and info.

Very welcome. We all have started out in this CBG adventure as beginners. Some keep things simple as a stick in a box. Others dive into more advanced building and wiring setups. And any question is valid, with many members offering great advice from his or her experience.


Hi Darryl. I notice you are in Perth . North or South of the River?


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