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 Forum index » DIY Hardware and Software
MonotrOndes - my Ondes Martenot-style instrument
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ElectronicMelodist



Joined: Jan 14, 2014
Posts: 4
Location: Finland

PostPosted: Tue Jan 14, 2014 3:00 pm    Post subject: MonotrOndes - my Ondes Martenot-style instrument Reply with quote  Mark this post and the followings unread

Hello!

I have found out that many electro-music members have been interested about my hacked Monotron.
http://electro-music.com/forum/post-389243.html

I just made a new blog post about that expression controller. It's optical design. You might find it interesting.

Here is a link

http://electronicmelodist.blogspot.fi/2014/01/how-to-build-monotrondes-part-4.html

Cheers,

Ville
(aka. Electronic Melodist)
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ElectronicMelodist



Joined: Jan 14, 2014
Posts: 4
Location: Finland

PostPosted: Sat Jan 18, 2014 12:03 am    Post subject: Reply with quote  Mark this post and the followings unread

So what you think? Smile

Morley volume pedals use electro-optical system. Does anyone own one? I don't know if Morley's designs use one or two LDRs. Using 2 LDRs in voltage divider configuration don't attenuate sound and stops sound from leaking.
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LFLab



Joined: Dec 17, 2009
Posts: 179
Location: Rosmalen, Netherlands

PostPosted: Sun Jan 19, 2014 7:12 am    Post subject: Reply with quote  Mark this post and the followings unread

Pretty cool!
So you made a potmeter with two LDR's? Does that work well?
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ElectronicMelodist



Joined: Jan 14, 2014
Posts: 4
Location: Finland

PostPosted: Sun Jan 19, 2014 12:06 pm    Post subject: Reply with quote  Mark this post and the followings unread

Thank you!

It works perfectly! You can hear that LDR-pair design at work in this video

http://www.youtube.com/watch?v=T3swg8nbISA

Another LDR-pair is controlling the filter cutoff producing brass-like attack.
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new voodoo



Joined: May 06, 2013
Posts: 90
Location: RVA USA

PostPosted: Sun Jan 19, 2014 7:40 pm    Post subject: Reply with quote  Mark this post and the followings unread

so if i understand-yr using the LDRs instead of just the pot, because you want to control the filter and volume as well-so potentially 3 things with the same motion? (pot functioning as axle, 2 ldrs & LEDs functioning as an open vactrol)

im not sure id use the lever myself, but its a really cool thing to have done. even if its not what i would have done.
Im still interested in the monotron module conversion btw-its aboutn 14 projects back so i should be getting to it in a week or 2. Some paying stuff got in frnt but i DO admire your ingenuity and inventiveness. im impressed !(whatever that's worth Smile )

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ElectronicMelodist



Joined: Jan 14, 2014
Posts: 4
Location: Finland

PostPosted: Tue Jan 21, 2014 6:07 am    Post subject: Reply with quote  Mark this post and the followings unread

Thank you! This design makes possible to adjust lever action without complex mechanics. If you use normal potentiometer you have to find a way to get full min and max value of the pot. And there is no viper so it's crackle-free and durable.
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