Audio Electronic Circuit Schematics

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timdrage
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Re: Audio Electronic Circuit Schematics

Post by timdrage » Fri Dec 14, 2018 6:57 am

lukesolved.jpg
lukesolved.jpg (99.42 KiB) Viewed 2108 times
finally figured out for a friend how to wire up an on-on-on dp3t switch as a 3-way. This will work... right? the dark blue diagonal line = a jumper wire unrelated to the blue switch position lines, my colour code is confusing here.

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crochambeau
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Re: Audio Electronic Circuit Schematics

Post by crochambeau » Fri Dec 14, 2018 12:51 pm

timdrage wrote:
Fri Dec 14, 2018 6:57 am
lukesolved.jpg

finally figured out for a friend how to wire up an on-on-on dp3t switch as a 3-way. This will work... right? the dark blue diagonal line = a jumper wire unrelated to the blue switch position lines, my colour code is confusing here.
Your goal is to connect the sections to ground/common? If so, then yes:

Red (switch up in relative position) will shunt HP and nothing else.
Blue (center) will shunt BP and nothing else.
Green (down) will shunt LP and nothing else.

I like ON ON ON toggles, but have run into failures more often than any other type. The most inexpensive I'll go anymore is Taiway or E-Switch, and I steer clear of the bottom dollar house brand like the plague. I have not yet checked out Vimex, but hear good things... YMMV.

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timdrage
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Re: Audio Electronic Circuit Schematics

Post by timdrage » Sat Dec 15, 2018 5:43 am

Cool! Yes that's the aim, waiting to hear if it worked out :)

Thanks for that info :)

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timdrage
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Re: Audio Electronic Circuit Schematics

Post by timdrage » Sat Dec 15, 2018 5:44 am

Just found this which looks promising, will build. 'Coloured feedback noise'

https://www.stereoping.com/eurorack-fee ... evelopment

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timdrage
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Re: Audio Electronic Circuit Schematics

Post by timdrage » Sun Dec 16, 2018 1:32 pm

Atypical transistor-based chaotic oscillators: Design, realization, and diversity

https://www.researchgate.net/publicatio ... _diversity

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timdrage
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Re: Audio Electronic Circuit Schematics

Post by timdrage » Fri Feb 08, 2019 4:58 am

Randomly found this manual for a tube-based op-amp, actually quite educational about how op-amps generally work and the example circuits give me some ideas :) http://www.philbrickarchive.org/applica ... to1961.htm

the site is a motherlode of obsolete info and 50's electronics catalogs :)
http://www.philbrickarchive.org/chronol ... chrono_end

Danger Music - http://www.philbrickarchive.org/generat ... (k2-w).pdf


ANALOG COMPUTORS yey

https://archive.org/details/A10001_201701
textsA Palimpsest on the Electronic Analog Art
by George A. Philbrick Researches, Inc.

handy:
Image

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timdrage
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Re: Audio Electronic Circuit Schematics

Post by timdrage » Fri Feb 08, 2019 8:03 am

RIP most of WhiteWarlock's posts i guess?

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timdrage
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Re: Audio Electronic Circuit Schematics

Post by timdrage » Wed Apr 10, 2019 12:36 am



this filter looks fun, might try it

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EATyourGuitar
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Re: Audio Electronic Circuit Schematics

Post by EATyourGuitar » Sat Jul 06, 2019 6:09 pm

the guy in the video explaining the circuit has no idea how it works and is scared to post the math because he thinks that math is a copyright issue. to some extent it is true you cannot totally plagiarize a magazine article but this is public domain science taught in colleges everywhere.

https://www.electronics-tutorials.ws/fi ... ter_7.html

scroll down to "Infinite Gain Multiple Feedback Active Filter"

the article states that it is also a resonance circuit so you should be careful with feedback loops such as a matrix mixer or feedback looper because this is a fixed filter. it will become a fixed frequency oscillator if you do use it like that. pretty much a one trick pony. you should also be aware that an opamp based infinite gain design with 1M in the negative feedback loop is only limited by the gain of the opamp (not the resistors and capacitors). this can be a very poor design that will yield unpredictable results when switching to different opamps that have different maximum gain (gain bandwidth product).

for more information about gain bandwidth product see here
http://www.physics.unlv.edu/~bill/PHYS4 ... asheet.pdf

P.S. I also noticed that this is the circuit from the cover of my bible!
https://www.amazon.com/Analog-Filter-De ... 0030592461

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timdrage
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Re: Audio Electronic Circuit Schematics

Post by timdrage » Fri Jul 12, 2019 7:59 am

"Infinite Gain Multiple Feedback Active Filter"
sold
the article states that it is also a resonance circuit so you should bea very poor design that will yield unpredictable results when switching to different opamps that have different maximum gain (gain bandwidth product).
double sold :D

thanks for the infos :)

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Re: Audio Electronic Circuit Schematics

Post by EATyourGuitar » Fri Jul 12, 2019 1:00 pm

multiple feedback is the noise cancelling kind. it translates to silence below 20Hz and silence above 20KHz. it is definitely not as cool as it sounds. I think the best description of this circuit is that it has a resonant frequency exactly like a guitar amp with a microphone feeding back into the guitar amp. it just makes a tone of a constant pitch. it doesn't change till you mess with the EQ on the guitar amp or the pedal or some mic movement trick. if you build two of these or maybe 5 of these then you can put them into feedback mixers or eurorack with some VCA + LFO. they will naturally find stasis after a few milliseconds so you need to perform on the knobs or you need some VCA or VCF in there somewhere. there is a point that is naturally unstable when the two different resonances of two circuits have exactly equal gain through the total system end to end but to find that sweet spot by adjusting all the volumes, sends, returns etc.. is like balancing a bowling ball on a knife edge. the LFO allows you to constantly knock it out of stasis back into temporary chaos.

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ablablablablabla
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Re: Audio Electronic Circuit Schematics

Post by ablablablablabla » Sun Jul 21, 2019 12:24 pm

I'm turning this:

Image

into this:

Image

into this:

Image


https://noisebob.com

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WhiteWarlock
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Re: Audio Electronic Circuit Schematics

Post by WhiteWarlock » Sun Jul 21, 2019 12:45 pm

Image
basically ye olde "Baby10" minus two of the 4017 steps... aka baby8
btw there is method for chaining multiple 4017s together...
for adding steps in sequences
btw there's method for changing the step sizes...
yet involves changing the circuit flow of your switches/LEDs...
you get that can also be turned into gate/trigger?
gate/trig seq would be much more useful than dual CV IMO
also slide/slew can be added for the pitch CV somewhat easily
looks like you are having some fun with it
https://hackaday.com/tag/baby10/
Last edited by WhiteWarlock on Sun Jul 21, 2019 1:05 pm, edited 2 times in total.

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ablablablablabla
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Re: Audio Electronic Circuit Schematics

Post by ablablablablabla » Sun Jul 21, 2019 1:02 pm

WhiteWarlock wrote:
Sun Jul 21, 2019 12:45 pm
Image
you get that can also be turned into gate/trigger?
yeah yeah.. thats the whole point..

for triggering toys and gadgets


yeah yeah yeah cascading 2 of these 4017s you get a 20-step sequencer..

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WhiteWarlock
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Re: Audio Electronic Circuit Schematics

Post by WhiteWarlock » Sun Jul 21, 2019 1:13 pm

hmmm gate/trigger is actually not the same as pitch CV...
sort of comprehend exactly what you are doing with this circuit...
and using it for circuit bending...
there are advantages of having gate/trigger with bending... and beyond
yet sort involves redesign
anyways
you can do gate trig manually using that dual channel
program the variable volts
0-whatever over +5
depending on your power

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