using piezo disks to create pickup system

benhu · 9th January 2013, 10:29 AM

Hi there,

I'm trying to figure out how I could ever wire several jacks in serie/parallel (no idea) together so I can have multiple input going through only one output.
The purpose is building a vibraphone pickup like this k&k sound system:

Vibraphone Amplification - K&K Sound

or this self-made system:

Homemade vibraphone pickups

I found this schematics on a forum but I'm not able to understand any single thing. How could I start from this drawing to finalize my mixer in the real world ?

Does somebody out there know how to "link" those jacks ?
Thank you so much,

Benoit

sreten · 11:27 AM

http://www.casperelectronics.com/ima...s/mixer_sc.gif

Image removed by moderation and replaced with link due to copyright concerns.

Hi,

Many variants of the standard mixer circuit, you can keep adding
input channels to the virtual earth mixing point, pin 2 of ICa.

You might need to add active buffers on each input for high
input impedance to suit the piezo's, TL074 or similar.

rgds, sreten.

JMFahey · 9th January 2013, 03:50 PM

1) forget about the mixer posted above, it has absolutely useless 10K input impedance.
And inadequate 4 channels only.

2) you will need a lot of individual Piezo Preamps, such as this:

which is good for 2 piezos, and then mix their outputs.

How many Piezos will you need?

Is it acceptable to have just a single "main" volume? (I guess so).
Because that will simplify design *a lot* .
Don't think you need individual note volume adjustment, do you?

Then I may suggest a general, *many* inputs mixer.

What will you drive with it?

9th January 2013, 10:29 AM	#1
benhu diyAudio Member Join Date: Jan 2013	using piezo disks to create pickup system Hi there, I'm trying to figure out how I could ever wire several jacks in serie/parallel (no idea) together so I can have multiple input going through only one output. The purpose is building a vibraphone pickup like this k&k sound system: Vibraphone Amplification - K&K Sound or this self-made system: Homemade vibraphone pickups I found this schematics on a forum but I'm not able to understand any single thing. How could I start from this drawing to finalize my mixer in the real world ? Does somebody out there know how to "link" those jacks ? Thank you so much, Benoit

9th January 2013, 11:25 AM	#2
sreten diyAudio Member Join Date: Nov 2003 Location: Brighton UK	http://www.casperelectronics.com/ima...s/mixer_sc.gif Image removed by moderation and replaced with link due to copyright concerns. Hi, Many variants of the standard mixer circuit, you can keep adding input channels to the virtual earth mixing point, pin 2 of ICa. You might need to add active buffers on each input for high input impedance to suit the piezo's, TL074 or similar. rgds, sreten. __________________ There is nothing so practical as a really good theory - Ludwig Boltzmann When your only tool is a hammer, every problem looks like a nail - Abraham Maslow Last edited by sreten; 9th January 2013 at 11:27 AM.

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9th January 2013, 03:50 PM	#3
JMFahey diyAudio Member Join Date: Mar 2009 Location: Buenos Aires - Argentina	1) forget about the mixer posted above, it has absolutely useless 10K input impedance. And inadequate 4 channels only. 2) you will need a lot of individual Piezo Preamps, such as this: which is good for 2 piezos, and then mix their outputs. How many Piezos will you need? Is it acceptable to have just a single "main" volume? (I guess so). Because that will simplify design a lot . Don't think you need individual note volume adjustment, do you? Then I may suggest a general, many inputs mixer. What will you drive with it?