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[DESIGN] Piezo-Piezo to Piezo-Switch Adaptor (by Keith Raper)
July 5, 2007
12:54 am CEST
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tazinnuedo
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September 10, 2010
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the circuit only works with a piezo/switch input... if your input is physicaly "mono" in your module (input 4  so) there is no solution i think ...   have you got the rim when you plug a real dual roland pad (main piezo and membrane switch like a cy5 for example)

July 5, 2007
1:47 am CEST
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elrules
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August 7, 2007
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Of course I can. The PD-8 and CY-8 pads are that, piezo + switch, and they work with 2 sounds in those inputs, head and rim.
But I have build all the 3 circuits and as I said here before they hasn't worked.
Circuit 2 has near 0 sensitivity on rima and Circuit1/3 gives me the same sound (the one from the head).
 and i don't know what to do.

July 9, 2007
12:11 am CEST
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PFozz
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February 5, 2004
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The "rim detection" part of your circuit 2 seems to work.
Try to connect the rim piezo "+" (ceramic part) to the tip of your stereo plug.
 
Best.

July 9, 2007
6:40 pm CEST
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elrules
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August 7, 2007
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ORIGINAL: PFozz

The "rim detection" part of your circuit 2 seems to work.
Try to connect the rim piezo "+" (ceramic part) to the tip of your stereo plug.

Best.

Do you mean I have to connect the two "+" of the piezos with a wire? or with a diode like circuit 1/3?

It seems you know how the circuit exactly works. I would appreciate if you could give a technical explanation about each part of the circuit, what do they do, etc. That information would be very very useful to me because then I could be able to change component values with the knowledge of what I'm changing, or to add or remove parts of the circuits to achieve what I need.

(Thanks for all of your replies)

July 16, 2007
12:09 am CEST
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elrules
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August 7, 2007
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Somebody there?

July 16, 2007
12:10 pm CEST
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Rogue
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February 24, 2004
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Hi - Pfozz is currently on vacation, so you are unlikely to hear from him in the imminent future.

Best Regards,
RM

July 23, 2007
7:24 pm CEST
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PFozz
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February 5, 2004
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Thanx Rogue 😉

> Do you mean I have to connect the two "+" of the piezos with a wire? or with a diode like circuit 1/3?

You should try with a diode.

> It seems you know how the circuit exactly works.

Actually, Keith Raper is the man of the situation 🙂
I'm formerly not into analog electronics but here's what I understand from the schematics :

.D1 and D2 won't allow a piezo xducer to make his buddy "buzz".
.Q1 acts as a triggered switch : basically, if there's enough current coming to its "base", Q1 allow what's coming from its collector to flow to its emitter.
.R1 limits the sensitivity (more the value is, less sensible will be the detection)
.R2 increases the sensitivity (more the value is, more sensible will be the detection)

In the 2nd circuit, the "main" piezo xducer determines the velocity of a hit, while the "aux" piezo xducer is use to trigger a kind of switch that determines which zone of your dual pad is played.

In circuits 1/3, if you're playing the first mono pad, its piezo transducer is used to determine the velocity and basta.
If you're playing the second pad, its piezo is used to determine the velocity of the hits and what's coming from this same piezo will make the circuit "link" the ring and sleeve parts of your socket.

Hope this helps,
Best.

July 27, 2007
9:59 pm CEST
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elrules
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August 7, 2007
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Thanks for your posts. I have now the ideas clearer.This thread and http://www.vdrums.com/forum/sh.....post261412 has helped me a lot.

The only thing now is to receive my piezos and make my own pads and try to build this circuit to make them work

May 23, 2008
11:17 pm CEST
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KeiichiRX7
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May 24, 2008
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Okay, i know this is really off the wall and odd for drumming, but would it be possible to get a variant of this that will convert 3 piezos into 3 switches?  I ask because a full set of e-drums with a module is a bti out of my reach, so ive taken to modding game controllers and building my own stuff.
 
currently (feel free to laugh) i'm tapping alng on a rock band drumset (yes the one for the video game), with a couple addon cymbal stands with pads mounted on top.  there are 3 extra buttons on the controller that i dont use for anything when it's connected to my PC.  I'd like to take those buttons and put them to use by using a variant of the piezo-switch circuit.  Currently i'm planning on using a pintech pickup on each pad.
 
I know my controller is lowtech and doesnt offer much in the way of velocity control, but its what i can afford.  So in essence i'm playing sample pads not really electronic drums.
 
so yeah, the desired outcome is hit pad, close circuit

March 1, 2009
12:27 pm CEST
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bixpiu
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March 1, 2009
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sorry for my difficulty to understand. with it is possible to connect two mono pads to a stereo exit and assign two sounds? i've a Yamaha dtxplorer and i would like to expand my set. i can use stereo exit for connect two pads?

September 27, 2009
8:42 pm CEST
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ricepattydaddy
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September 27, 2009
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umm i have the alesis i/o and i would like to use chokable cymbals and 3 zone cymbals that i make myself. I dont understand what you used to make it work. i was wondering if you could tell me exactly what i would need just to make the Keith raper circuit. i have piezos, i have old crappy cymbals, i have soldering iron. plz explain in detail. exactly what i need to go buy to make this happen.

October 24, 2009
12:52 am CEST
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JULIO HENRIQUE
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December 2, 2009
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estou tendo dificuldades para fazer o PCB Switch Adaptor... alguém poderia me ajudar¿

March 17, 2012
10:52 pm CEST
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cturts
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April 21, 2011
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can anyone post a more dteailed picture of how they have made this circuit, I am trying to make an ekit cymbal using this for a 2-zone. I've got one of the piezos working (te one which connects straight onto it) but have tried all kinds of variations on what I can see in that circuit but can't seem to get it working, I have no previous experience so the more help the better, I would really appreciate it.
Thanks

January 8, 2016
11:32 pm CEST
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AJOMuse
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January 19, 2015
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No success with the piezo-switch (KRC) design on my Alesis DM10. Works with my DIY piezo-real switch.
I'm using a 2N5961 instead of a BC337, could that be an issue ? (there supposed to be equivalent).

Also I'd like to know how a hard hit on the rim is received differently than a pinch.

Lastly, elrules put a link to a Vdrum post which he says helped him. The link doesn't work unfortunately. Is it possible to check ?

Thanks

AJOMuse

March 7, 2018
5:38 am CEST
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flashback_1
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March 7, 2018
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tazinnuedo said
does someone can tell me what is a schottky diode please???? is there a schematic about the new circuit with udpates? because i'm bad and i don't understand where i have to insert a jumper...  ( the jumper is here to shorcut  one of the diodes???right???)
 
does the last photo represent the first schematic or the second???  i'm not sure but there there 's a lot af componant into the box and the second schematic no...
 
francois  

Hi tazinnuedo - you can use a 1N34A germanium diode in place of the Schottky diode. Schottky diodes exist primarily because of very fast reverse recovery time - useful in switching power supplies and class D audio amplifiers. They tend to have a lower forward voltage than silicon diodes but the germanium 1N34A does better at the lower forward currents such as exist in the Raper circuit.

March 25, 2018
8:33 pm CEST
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KaeptnBlaubaer
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March 25, 2018
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Hello together, I use the AUX part from the second circuit (yellow piezo) to use a trigger bass drum pad on an drum modul which normally have only a switch pedal for the bass drum. The circuit works very well, but if I make smooth kicks the sensivity is a bit to low and some kicks don´t give a sound. How can I increase the sensitivity of these circuit? I tried to use a potentiometer for R1 to adjust the resistance, but it doenst help. How can I improve?
To get more sensitivity must I decrease R1 and increase R2?
Thank you for your help.

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