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PHOBoS
Joined: Jan 14, 2010
Posts: 5810
Location: Moon Base
Audio files: 709
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 Posted: Wed Jul 20, 2016 7:26 am Post subject:
Dronoscope
Subject description: Dronesynth based around the Elektor Oscillographics circuit, with build in mini TV-scope. |
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In 2012 I built the Dronoscope but I never made a dedicated thread for it.
So here is some of the info I posted, all the photos and some videos.
from the 2012 Build Pictures thread:
| PHOBoS wrote: | I just finished the Dronoscope (well 99%, I need to replace one switch for aesthetic reasons)
It started out when I found the Elektor Oscillographics circuit (posted here)
I have a couple of small TV's which I was planning to use as visualizers
(maybe even make a synth module out of one) and this seemed like a nice
circuit for it.
I first started working on the elektor circuit itself, and made some small
modifications to make it more usefull for drones. By itself it produces nice
visuals and a droney sound but the fun starts of course when you
modulate it. So I started making some LFO's then some VCO's to change
the sounds some more, a filter seemed usefull and after a couple of
months I made so much extra stuff that I would need a really big case to
fit it all in. That's when I saw the beautiful boxes build by Captain Biscuits
and this made me decide to cut the whole project into smaller parts.
I had a really nice case i found at thrift shop and the TV just fitted in so
I worked with that. It was quite a challenge to get everything in and
especially how to mount the TV tube. 
but Im VERY happy with the result. 
The TV is still in working condition and it can also take external deflection
signals. The amp of the TV can be used for other signals and it's
attached to an internal speaker. I also amplified the TV audio to 10Vpp so
it can be used as white noise if you don't connect anything to the antenna
input. And there is a comparator circuit in there aswell to convert the
noise (or another signal) to a square/pulsewave. |
from the original Elektor Oscillographics thread:
| PHOBoS wrote: | | creekree wrote: | ha, I dont know how I managed to not find the files....
your project is what ignited my interest in the first place!
how exactly did you manage to use the TV as a display? |
 nice that it inspired you (that's why I put it online)
using the TV isn't very complex. feed the signal of the oscillographics circuit
(or whatever you want to display) to an audio amplifier and attach the
speaker outputs to the TV's deflection coils. Off course you have to remove
the original wires first. I used a switch myself so I can still use it as a TV.
For the amplifier I used one from a set of computer speakers.
I have done this with a TV and computer monitor before and it worked fine
but in this case it didn't. Displaying the signals worked but the image was
very dim. This had to do with the fact that a part of the TV is powered in
series with one of the deflection coils. So by removing that connection it
couldn't work like it should. (JovianPyx knows more about this). I solved it
by using a speaker coil with a series resistor as a mock deflection coil.
I just used what I had laying around, I think the speaker was 8ohms/50Watts
and I used a 15ohms/1Wattt series resistor (which does get warm).
I didn't want to experiment too much since it worked and was too afraid I
might detroy the TV and that would mean end of project. |
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_________________
"My perf, it's full of holes!"
http://phobos.000space.com/
SoundCloud BandCamp MixCloud Stickney Synthyards Captain Collider Twitch YouTube
Last edited by PHOBoS on Wed Jul 20, 2016 8:50 am; edited 1 time in total |
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PHOBoS
Joined: Jan 14, 2010
Posts: 5810
Location: Moon Base
Audio files: 709
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| Posted: Wed Jul 20, 2016 7:29 am Post subject:
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more photos
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| external PONG game connected to show the TV is still fully functional |
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_________________
"My perf, it's full of holes!"
http://phobos.000space.com/
SoundCloud BandCamp MixCloud Stickney Synthyards Captain Collider Twitch YouTube |
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PHOBoS
Joined: Jan 14, 2010
Posts: 5810
Location: Moon Base
Audio files: 709
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