Replies to This Discussion

Permalink Reply by Scott aka Farmer Ted on December 30, 2016 at 3:12pm

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

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Permalink Reply by jeff Cadzow on December 30, 2016 at 3:30pm

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?

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Permalink Reply by Scott aka Farmer Ted on December 30, 2016 at 3:34pm

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.

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Permalink Reply by jeff Cadzow on December 30, 2016 at 3:54pm

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.

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Permalink Reply by darryl kernaghan on December 30, 2016 at 4:09pm

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

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Permalink Reply by Rick Gaudreau on December 31, 2016 at 2:39am

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.  

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Permalink Reply by darryl kernaghan on December 31, 2016 at 2:47am

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

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Permalink Reply by Rick Gaudreau on December 31, 2016 at 3:06am

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. 

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Permalink Reply by Scott aka Farmer Ted on December 31, 2016 at 3:04am

Rick,

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.

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Permalink Reply by Rick Gaudreau on December 31, 2016 at 3:10am

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.

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Permalink Reply by Scott aka Farmer Ted on December 31, 2016 at 3:26am

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.

Cheers

Permalink Reply by jeff Cadzow on December 31, 2016 at 6:49am

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

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