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PHOBoS
Joined: Jan 14, 2010 Posts: 5581 Location: Moon Base
Audio files: 705
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Posted: Tue Feb 03, 2015 5:20 pm Post subject:
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hmm I guess you could use batteries but it depends a bit on how many LEDs you're using. I estimate that in my version the current
for the LEDs alone is upto 150mA when all are on. And then there is the amplifier which needs some current aswell.
Of course if you're using D-cells or maybe some high power battery pack it wouldn't be much of a problem.
As for changing the voltage, it'll work but the fading times will most likely be effected. This also depends on the LEDs that are used.
I experimented with values untill I was happy with how it looked, so I'd advice you to do the same.
Looking forward to the results if you build it. _________________ "My perf, it's full of holes!"
http://phobos.000space.com/
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schmelfhelp
Joined: Apr 15, 2012 Posts: 24 Location: france
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Posted: Tue Feb 03, 2015 6:48 pm Post subject:
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oh ok cool. So is the power supply 12v due to the leds? If i were to build just the audio part, do you think that would work at 9v?
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PHOBoS
Joined: Jan 14, 2010 Posts: 5581 Location: Moon Base
Audio files: 705
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Posted: Sat Feb 07, 2015 4:40 am Post subject:
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As with the LEDs changing the voltage will affect the fading time,. although most of the circuit runs on 10V so it
shouldnt be a huge difference with 9V. The reason for the 10V regulator is to keep the voltage stable with the constantly
varying load so that the oscillators will stay in tune. Without the LED's the load is much lower so should be pretty stable. _________________ "My perf, it's full of holes!"
http://phobos.000space.com/
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Ruebezahl
Joined: Mar 09, 2014 Posts: 104 Location: Taiwan
Audio files: 4
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Posted: Wed Oct 27, 2021 1:44 pm Post subject:
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Just wanted to dig out this old thread to say that i find this machine quite inspiring with those coming and going LED's and accompanying drones. I also watched the video on repeat for a few times
Thanks for sharing!
And i have a question: So the LFOs are 40106, so they give out Squarewaves. The circuits before the transistors, with the big capacitors, that turns them into triangle waves? pretty nice, i've got to try that! _________________ https://soundcloud.com/ruebezahl |
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PHOBoS
Joined: Jan 14, 2010 Posts: 5581 Location: Moon Base
Audio files: 705
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Posted: Thu Oct 28, 2021 1:07 pm Post subject:
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yeah it's quite mesmerizing isn't it
Quote: | And i have a question: So the LFOs are 40106, so they give out Squarewaves. The circuits before the transistors, with the big capacitors, that turns them into triangle waves? pretty nice, i've got to try that! |
not really a triangle as that would require a constant current source (often done with a transistor). In the most extreme case when the frequency
of the oscillator is lower than the time it takes to fully charge/dicharge the capacitor it would look like this:
The actual shape depends on the RC values and the frequency of the oscillator. If this frequeny is high compared to the time it takes to charge the cap
then it doesn't get fully charged/discharged and you will only get a small section of that curve which will be more linear and closer resemble a triangle. _________________ "My perf, it's full of holes!"
http://phobos.000space.com/
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Ruebezahl
Joined: Mar 09, 2014 Posts: 104 Location: Taiwan
Audio files: 4
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Posted: Sun May 08, 2022 1:16 am Post subject:
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PHOBoS wrote: |
The actual shape depends on the RC values and the frequency of the oscillator. If this frequeny is high compared to the time it takes to charge the cap
then it doesn't get fully charged/discharged and you will only get a small section of that curve which will be more linear and closer resemble a triangle. |
Ah, i just saw your answer. Thanks for the explanation. So in any way that part is what makes the drones and the LED's slowly fade in and out instead of turning on and off immediately. kind of an gate-to-envelope-converter...
But i am wondering why it is necesary to have this circuit kind of twice, each for controlling the LED's and the sound. It wouldn't work to create the envelope and give this same voltage to both transistors? Why those two gate-to-envelope-converters use different values? Wouldn't it make sense to have the LEDs and the sounds go in sync? And why does the sound-envelope use two caps instead of one? was that just to achieve a certain value that you didn't have on hand otherwise?
sorry for the many questions, i could also just breadboard it and try around, but i am very curious, and to hear why things do what they do, and why certain people designed something the way it is, very educational _________________ https://soundcloud.com/ruebezahl |
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PHOBoS
Joined: Jan 14, 2010 Posts: 5581 Location: Moon Base
Audio files: 705
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Posted: Mon May 09, 2022 10:53 am Post subject:
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Ruebezahl wrote: | So in any way that part is what makes the drones and the LED's slowly fade in and out instead of turning on and off immediately. kind of an gate-to-envelope-converter... |
yep
Quote: | But i am wondering why it is necesary to have this circuit kind of twice, each for controlling the LED's and the sound. It wouldn't work to create the envelope and give this same voltage to both transistors? Why those two gate-to-envelope-converters use different values? Wouldn't it make sense to have the LEDs and the sounds go in sync? |
it's been a while so I don't remember the exact why but they each have a somewhat different response curve. Most likely I tested the sound first and then added the LEDs which was easier to fine tune to behave the way I liked by using a seperate circuit. Or I did the LEDs first as I also build a similar circuit that only has fading LEDs, no sound.
It should be possible to use the same envelope generator for both but it'll require some experimentation to get a nice response.
Quote: | And why does the sound-envelope use two caps instead of one? was that just to achieve a certain value that you didn't have on hand otherwise? |
I am not 100% sure but I recall that without that second cap the audio would still bleed through when fully closed and adding that cap took care of that.
You'd have to breadboard it to make sure.
Quote: | sorry for the many questions, i could also just breadboard it and try around, but i am very curious, and to hear why things do what they do, and why certain people designed something the way it is, very educational |
never stop asking questions
For me personally design decisions range from understanding what I am doing/having somewhat of an idea/trial and error/everyone else does it _________________ "My perf, it's full of holes!"
http://phobos.000space.com/
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Ruebezahl
Joined: Mar 09, 2014 Posts: 104 Location: Taiwan
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Posted: Tue May 10, 2022 12:49 am Post subject:
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Thanks for the answers, and agreed on the design process, although i hope at least the "know what i am doing" can gradually become bigger _________________ https://soundcloud.com/ruebezahl |
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klangumsetzer
Joined: Jan 23, 2006 Posts: 513 Location: Sweden
Audio files: 32
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Posted: Wed Jun 01, 2022 4:17 am Post subject:
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I really like the instrument, the sound and the LED visualization.
Very well done, PHoBOS! _________________ Make a joyful noise!
Eike |
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PHOBoS
Joined: Jan 14, 2010 Posts: 5581 Location: Moon Base
Audio files: 705
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