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Mini Focus Fader


Guest rasteri

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Guest rasteri

...so how does the focus fader actually work? is there stuff I could read or is it a secret? :)

 

What, the original? I wrote an article on it : http://rasteri.com/wiki/Focus_Fader

 

There's pretty much nothing to it, it's literally an LED, a transistor and a couple of resistors. On my board I'm wiring it up as a common-emitter amplifier - https://en.wikipedia.org/wiki/Common_emitter

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Love this!

 

I am looking for a basic fader to act as a basic sharp envelope/VCA to run a 5 volt signal through for my eurorack. Anyone have ideas? Something small like the Raiden/InnoMINI would be ideal but not sure if they would work. The 5 volt signal won't be audible but I have a feeling I need a smooth but short cut to avoid that signal popping and giving me artifacts.

 

I have a couple spare focus fader V2 and pro x fades I can use to modify and I am skilled in modifying things if anyone has some ideas.

 

Thanks in advance!

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Guest rasteri

I am looking for a basic fader to act as a basic sharp envelope/VCA to run a 5 volt signal through for my eurorack. Anyone have ideas? Something small like the Raiden/InnoMINI would be ideal but not sure if they would work. The 5 volt signal won't be audible but I have a feeling I need a smooth but short cut to avoid that signal popping and giving me artifacts.

Hey man.

 

Probably the best approach would be to use the innofader pro2. It can run from a wide voltage range, you can set the curve really sharp, and it has schmitt triggering and decay to eliminate any pops and clicks.

 

You could use a standard fader with your own circuit but it'd be nontrivial. You're looking at building a schmitt trigger (like my nanofader circuit has) and then lowpass filtering the signal output with a capacitor to add decay.

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I am looking for a basic fader to act as a basic sharp envelope/VCA to run a 5 volt signal through for my eurorack. Anyone have ideas? Something small like the Raiden/InnoMINI would be ideal but not sure if they would work. The 5 volt signal won't be audible but I have a feeling I need a smooth but short cut to avoid that signal popping and giving me artifacts.

Hey man.

 

Probably the best approach would be to use the innofader pro2. It can run from a wide voltage range, you can set the curve really sharp, and it has schmitt triggering and decay to eliminate any pops and clicks.

 

You could use a standard fader with your own circuit but it'd be nontrivial. You're looking at building a schmitt trigger (like my nanofader circuit has) and then lowpass filtering the signal output with a capacitor to add decay.

 

Alright, thanks for your help! Any chance of helping re-make this module but with a possible other options? The original designer said he didn't get enough interest to make more.

 

https://www.modulargrid.net/e/ninstrument-euroxfader

https://www.muffwiggler.com/forum/viewtopic.php?t=135966

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