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Topic: Theremin as a Capacitive Sensing Device (Read 24949 times) previous topic - next topic

Its3darchitecturals

Would it be possible to use four hex inverters instead of nand or and gates
Thanks

polymorph

Read the thread, already asked and answered.

http://forum.arduino.cc/index.php?topic=65991.msg1225366#msg1225366

TL;DR
Yes.
Steve Greenfield AE7HD
Drawing Schematics: tinyurl.com/23mo9pf - tinyurl.com/o97ysyx - tinyurl.com/q7uqnvn
Multitasking: forum.arduino.cc/index.php?topic=223286.0
gammon.com.au/blink - gammon.com.au/serial - gammon.com.au/interrupts

Istar

"the mega 2560 and 1280 has this pin not mapped to the pin header
you can try to solder a thin cable directly to that pin or just use a arduino uno."

Maybe someone know, how needs to modify sketch for using pin JP2(instead of pin 5 in original sketch) on Arduino Mega 2560 in this device, which is havent any digital or analogue mark?  I try to replicate this device with cable soldering to unknown for IDE pin.

agittins

I'm considering building this but before I commit to it I'm curious to know - what sort of resolution have people achieved? The example video I've seen sounds very step-wise but I'm unsure if this is due to limited resolution on the sensing side or if it's because of the waveform generation on the output side.

I know the article states a resolution of 10hz but it's talking about the sensing oscillator which is running at about 1MHz so it doesn't hint at the number of steps reflected in the playable range nor what sort of hand movement is required per step.

I'd be interested in the experiences of anyone who's tried to use this design as the basis of an actual musical instrument, or who has measured its performance in that context.

I know I could just build it and see, and indeed the component costs are low but I'd need to order the bits for this and shipping charges mean I'd rather not do it if it's known to be unsuitable for my needs (which is to build two theremin each with pitch and volume circuits, possibly using external synthesis).

Pivetta

Hi, I've tried to build the board, but I'm new even to soldering so I just followed the given plan.
I tested it on a Funduino UNO board and I am getting no signal at all, by using your code, or just by reading the data fron the breadbord.

I have some photos, maybe I used the wrong components, or soldered something the wrong way. I was pretty confused as there are many differences between the drawn plan and what is too see in your soldered board.

http://www.pasteall.org/pic/show.php?id=104799

http://www.pasteall.org/pic/show.php?id=104802

Thanks from Stuttgart.

Pivetta

polymorph

Steve Greenfield AE7HD
Drawing Schematics: tinyurl.com/23mo9pf - tinyurl.com/o97ysyx - tinyurl.com/q7uqnvn
Multitasking: forum.arduino.cc/index.php?topic=223286.0
gammon.com.au/blink - gammon.com.au/serial - gammon.com.au/interrupts

bozopauk

Hello,first of all I want to state that I am a beginner.

Is it possible to move cursor (mouse pointer) like this instead of producing sound?

If you know any way and have the time, could you just give me some pointers what should be changed?

allanhurst

#22
Aug 28, 2016, 02:23 am Last Edit: Aug 28, 2016, 08:13 am by allanhurst
Fascinating subject!

    The original Theremin , still used occasionally as a musical instrument, had two similar oscillators running at a few hundred kHz.

   Both were free-running but one (A) was attached to an antenna such that the capacitance of a nearby object affected it's frequency.  The other (B) was similar, but shielded to eliminate that effect, and was carefully tuned by a variable capacitance at start-up to be at exactly the same frequency as the first( without a nearby influence).

   The two were multiplied together ( RF people call this mixing) and the difference frequency in the audio range extracted by a low pass filter, amplified, and fed to loudspeakers.

   This was done back in the 1920's! with, of course, valves.

   Drift was a serious problem, and the device had to be turned on and left for several hours with a stable power source and constant room temperature, with regular careful retuning until just before the performance...

   I think you could make a modern version working on this principle with an arduino providing  an auto-tune feature.

   If anyone's interested I'll give it some serious thought - but I'm a bit busy with another project just now.

   Give me a few days.........

regards

Allan.

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