Piezo drum trigger circuit

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Piezo drum trigger circuit

A lot has happened in the e-drum world over the last plus years. Companies and products have come and gone, and in many cases, come again.

piezo drum trigger circuit

Alternate Mode, Pearl, Roland, and Yamaha — all key initial players in the world of electronic drums — have continued to consistently create innovative products. Even with all this innovation, getting a pad or drum trigger to respond as wanted is still somewhat of a mystery.

Further complicating things, almost every situation is unique. Pads and acoustic drum triggers are susceptible to many external influences: pad or trigger type, type of pad mount, stage volume, and drum type and tuning in the case of acoustic drum triggers.

The vast majority of pads and acoustic triggers rely on piezo technology to make them work. A piezo is a crystal that has the property of producing voltage when it is put in motion.

This could be a rigid plate in a pad, or a drumhead of some kind. Because a piezo is very fragile, striking it directly will destroy it rather quickly. Because of this, many clever ways have been devised and patented to protect the piezo, while at the same time offering adequate triggering performance.

In addition to piezos, there is also increasing use of FSR technology — force-sensing resistors — in pads and acoustic triggering, most notably by Aquarian in its inHead drumheads and onHead pads. A bit more on FSR later.

When a pad is hit, a small amount of voltage is produced and sent to trigger input of the drum module. The harder the pad is hit, the larger the amount of voltage is produced; usually maxing out at around five volts.

The volume of the sound the drum module plays is directly related to the voltage produced by the pad. The higher the voltage, the louder the sound produced.

Piezos for Electronic Drums

All fairly simple. The height of this waveform is referred to as its amplitude; the higher the voltage, the larger the amplitude. In the real world, a triggered acoustic floor tom will have a long decay, while a triggered snare drum and pad will have much shorter decay.

Trigger settings inside the drum module are used to manipulate how the trigger waveform is interpreted.

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As a rule of thumb, short waveforms are much easier to interpret than long waveforms. This is because longer waveforms can have secondary trigger spikes.

These secondary spikes, which most often occur when triggering from acoustic drums, are difficult for the module to interpret. The faster a drum is played, especially those with a long decay, the harder this interpretation becomes. This often results in missed notes or double triggering. In these situations, tweaking of trigger settings will definitely be needed! Pads are fairly easy to make trigger accurately and precisely.

Piezo-based acoustic triggers are much more difficult to make perform well. Pads and short acoustic sounds are much easier to make trigger well than acoustic sounds with long decays. Terminology The first order of business is to cover some basic triggering terminology. Please note that there are a few differences between what each company calls the same setting. If there is an asterisk by a term, refer to Fig.

This can be caused by sympathetic and mechanical vibrations from adjacent pads, or external loud sounds like stage monitors.

LIVE from the Lab: Piezo-Electric Drum Pads

Double Trigger One or more sounds sounding just after the initial intended pad or trigger hit. This setting helps filter out mask double triggering in the first ms milliseconds after a trigger signal is recognized by the trigger input.

It is generally measured in milliseconds. Milliseconds A measurement of time. One-second equals milliseconds.

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For reference, in air, sound travels at the rate of about one foot per millisecond.They are lots of fun and offer a slightly more tactile method of control then rows of pots and switches. So today while I was playing around on my breadboard I was drawn to pull out some piezoelectric disks and start experimenting. This circuit uses a timer set up in monostable mode. A monostable timer will output a square wave pulse whenever it receives a trigger pulse from the piezo disc at pin 2.

The output pulse is then sent into the base of a 2N transistor which works as a gate between the audio source and the speaker.

This means when the pulse from the is high the audio will pass through the transistor and when the pulse ends and the output goes low the transistor will block the audio from passing. If you are interested in adjusting the pulse length beyond what is available using the pot this can be achieved by adjusting the electrolytic capacitor between pin 6 and ground. By lowering the value of this cap you can shorten the range of pulse lengths available.

Conversely by increasing it you can access a longer range of pulses. By setting up 4 or 5 of these piezo trigger circuits you could create a fairly versatile set of drum pads. A few weeks ago during one of my usual thrift store exploration I picked up a Kawasaki I-Soundz drum kit.

Even before doing any bending I started having a great time with this toy. It has a large and varied vocabulary of samples and surprisingly high quality stereo audio driven by an internal TDA operational amplifier. Unfortunately the device does not offer any polyphony but given the price point I did not expect it. The drum pads also contain a number of interesting on board rhythm samples.

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Unfortunately these samples only play for about 30 seconds before stopping regardless of whether you are playing the kit. Since I was looking for something I could use to set up repeating rhythms while I played other devices this left me with a need. I wanted to set up external triggers for the drum sounds. By using these external triggers in conjunction with my recently completed gate sequencer I could turn the Kawasaki drum pads into an 8 step drum machine and unlock a world of new rhythms.

The first step whenever you are setting up external triggers on any toy is to create a ground share point. This can be done by simply adding a banana jack or binding post and connecting it to any ground point on the circuit. When the pads are hit the piezo disk creates a trigger pulse. This pulse is sent to the base of an internal transistor highlighted abovewhich switches the circuit on momentarily and causes it to play the sample associated with the drum pad hit.

All we need to do to set up external triggers is send our external signal to the base of these transistors to switch them the same way the triggers from the piezo do. One thing I am admittedly not incredibly comfortable with is soldering onto SMD surface mount circuits. That being said this is something that I feel I need to improve and develop my comfort with.

Surface mount technology becomes more prolific and through hole circuitry becomes rarer and rarer each day. Further developing my comfort with SMD will open up near endless possibilities of new circuits I can work with. For this reason I have made it a goal not to shy away from these circuits. I will take the necessary care but am determined to become as familiar and comfortable with them as I am with more traditional components.

Where possible I soldered my leads to resistors adjacent to the internal transistors as there was less risk of damaging these components. To solder I held my soldering iron to tinned wires to heat them up prior to touching the board. Once the solder on the tinned wire was liquified I lowered the wire and soldering iron to the soldering point together.

I raised the soldering iron from the board almost immediately after touching the two down and held the wire in place until the solder solidified. The key here is to spend as little time as possible with the soldering iron on the board.

The components are significantly smaller and the solder connections are significantly weaker than traditional through hole circuitry. This means any excess heat on the board can damage components or loosen their solder connection knocking them out of place.

Since my solder points were weaker and the circuit was so crowded I also added a small amount of hot glue to each connection. Finally connect the wires from the trigger points to the trigger inputs of your choice.If this is your first visit, you will need to register to post or view specific content.

If you cannot sign in, please visit this topic for your solution, or our Forum Talk forum for answers to more frequently asked questions. Login or Sign Up. Logging in Remember me. Log in. Forgot password or user name? Which size piezo's for different sized drums? Posts Latest Activity. Page of 1.

piezo drum trigger circuit

Filtered by:. Previous template Next. Hey guys. I plan to convert a 10" two toms12" snare and floor tomand 14" tom floor tom and kick drum. I only plan on making the snare dual-zone, so rim piezo's for the toms aren't need. Tags: conepiezorimsizetom. As far as i know the piezo size doent really matter, most people use 35 or 27mm piezos. Comment Post Cancel. I use 27mm's on all my drums larger than 12". As far as smaller drums and half shell conversions the size does not seem to matter.This is a tutorial on how to make an electronic drum trigger with cheap parts which will work with most any electronic drum set up.

This is good for people with some basic soldering experience and familiarity with electronic drumming. Did you use this instructable in your classroom? Add a Teacher Note to share how you incorporated it into your lesson. You could use almost anything as the base material for your trigger. I am using wood because there's lots of free scraps at the shop at my school.

piezo drum trigger circuit

Wood also provides a good resonance, good stick action and is pretty durable. You could use a big hunk of wood like the one I found above, or 2x4s would work really well too. You can probably order them online somewhere for cheaper too, or just pull them off of old electronics. A piezo element is a sensor that measures force and converts it into an electric charge. That charge become the signal, sent through the phone jack, which is sent to the drum machine or interface.

Tools you will need include: bandsaw or handsaw, drill press, drill bits, boring drill bit, soldering iron, epoxy glue, screw driver and ruler.

Once you have a piece of wood, cut out a chunk you want to use as your trigger. This could vary in size, depending on the aesthetic you're going for or how much area you want to be able to play. I've been using pieces that are about 4" x 3. It doesn't matter how large the chunk is as long as there is room for the piezo disk and phone jack. If you have a 2x4 you could probably cut your trigger on a band saw or miter saw.

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With that big chunk of wood, I used a hand saw and a circular saw. Once you have cut the piece you want, sand it down so its smooth to avoid getting splinters or cracking the wood.

Then find the center of one face of the piece and drill a hole with a boring drill, one that's large enough for the piezo element to fit inside. This way we can hide it in the piece of wood. You can usually leave the piezo element in the plastic case it comes in, it will still work fine, but if you need to conserve space, you could crack the case with a flat head screw driver and simply clue the piezo disc itself to your trigger.

Measure your piezo element and then use a boring bit or smooth finish bit to make a hole that will fit the piezo element. The largest boring bit I could find at my school's shop was 1. Once you have an impression in the wood large enough for the piezo element, place it inside and mark where to screw in pilot holes for the screws that will hold it in place.

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Once you screw the pilot holes with the correct size bit for the screw you want to use, try screwing the piezo element into place. Once the piezo element is fitted, take it out to install the phone jack. First, measure the diameter of the phone jack.Forums New posts Search forums. Articles Top Articles Search resources.

Members Current visitors. Log in Register. Search titles only. Search Advanced search…. New posts. Search forums. Log in. Welcome to our site! Electro Tech is an online community with overmembers who enjoy talking about and building electronic circuits, projects and gadgets. To participate you need to register. Registration is free. Click here to register now. JavaScript is disabled. For a better experience, please enable JavaScript in your browser before proceeding. Piezo trigger circuit. Thread starter Neurotic Start date Sep 21, Neurotic New Member.

The piezo can be connected to the base and emitter pins of a transistor and the keyboard can be connected to the collector and emitter pins.

Piezo trigger circuit

But the correct polarity must be used. An e-drum is an electronic drum that uses a piezo transducer to generate a pulse when it is hit. Here is a simple circuit:. Yep, I guess that's what I needed. I'm building e-drums without velocity until I can afford to buy a midi trigger like megadrum or even a module. Thanks a lot! I'll contact you if I have any further questions. You must log in or register to reply here.This tutorial shows you how to use a Piezo element to detect vibration, in this case, a knock on a door, table, or other solid surface.

A piezo is an electronic device that generates a voltage when it's physically deformed by a vibration, sound wave, or mechanical strain. Similarly, when you put a voltage across a piezo, it vibrates and creates a tone. Piezos can be used both to play tones and to detect tones. The sketch reads the piezo output using the analogRead command, encoding the voltage range from 0 to 5 volts to a numerical range from 0 to in a process referred to as analog-to-digital conversionor ADC.

If the sensors output is stronger than a certain threshold, your board will send the string "Knock! Piezos are polarizedmeaning that voltage passes through them or out of them in a specific direction.

Connect the black wire the lower voltage to ground and the red wire the higher voltage to analog pin 0. Additionally, connect a 1-megohm resistor in parallel to the Piezo element to limit the voltage and current produced by the piezo and to protect the analog input. It is possible to acquire piezo elements without a plastic housing.

These will look like a metallic disc, and are easier to use as input sensors. PIezo sensors work best when firmly pressed against, taped, or glued their sensing surface. For more circuit examples, see the Fritzing project page.

In the code below, the incoming piezo data is compared to a threshold value set by the user. Try raising or lowering this value to increase your sensor's overall sensitivity.I've always wanted to learn how to play a drum kit, but my parents never let me because 'it takes up too much space' and 'it makes too much noise'. So now, many years and some electrical knowledge later, I've decided to make my own electronic drum kit! Did you use this instructable in your classroom?

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Add a Teacher Note to share how you incorporated it into your lesson. My piezos came with a little metal cap and short wires. You can cut the metal cap of and simply solder longer wires to those short little wires. If you chose to use plugs and sockets, you obviously have to solder your plug to the other side of your wire.

Connect the resistor to the wires of the piezo as shown in the diagram above. Connect the other wire of the piezo to an analog pin on your Arduino. If you're using plugs and sockets, you obviously use the wires of the socket and not the wires of the piezo. When you're not using all of the analog pins, you should connect the 'empty' pins with GND. Otherwise you might get false values because of noise. You can either connect everything on a breadboard as shown in the diagram.

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Or you can solder everything on a piece of PCB like I did. Take your CD and put it on the mouse pad. Draw a circle around the CD and then cut it out. Next stick the piezo to the CD with a piece of tape. Once that's done you'll need to glue the mousepads to the CD. I used a tiny bit of super glue. Make sure the glue doesn't get on the piezo! It'll ruin your piezo. I had to learn that the hard way.


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