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Post by malikmalin on Apr 29, 2021 16:49:20 GMT
in the MIXCONSOLE description, it says :
"The channel levels can be controlled via CV inputs, if no CV is attached, the level knob works as usual volume control."
how does the modune knows if something is connected to the cv input ?
I'd like to implement such a fonctionnality in a future diy module.
THX all
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Post by humpink on Jan 28, 2022 16:33:46 GMT
I think it cannot detect if a cable is inserted or not. But, assuming that the internal mixer vca works with a cv range from 0 to 2.5 volts, it could work like this: (beware of my epic paint skills)  The voltages of the pot and the cv in are summed via two resistors. Then, if the pot is fully turned left, you got full cv control. If you turn it up, it will act like an offset i think? In case there is voltage present on both inputs of the summer, the output voltage can reach more than 2.5 volts, so you‘ll have to limit it somehow, maybe with a diode? Disclaimer: neither do i own the module nor do i have any substantial knowledge in electronics, so this is just a guess  |
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Post by tIB on Jan 28, 2022 17:15:26 GMT
in the MIXCONSOLE description, it says : "The channel levels can be controlled via CV inputs, if no CV is attached, the level knob works as usual volume control." how does the modune knows if something is connected to the cv input ? I'd like to implement such a fonctionnality in a future diy module. THX all Robert talked about how he did that somewhere here ; maybe the mixconsole thread or the launch one? I'm afraid the guess above is not quite right - a good effort though. |
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Post by keurslagerkurt on Jan 29, 2022 23:14:57 GMT
I think it cannot detect if a cable is inserted or not. But, assuming that the internal mixer vca works with a cv range from 0 to 2.5 volts, it could work like this: (beware of my epic paint skills) View AttachmentThe voltages of the pot and the cv in are summed via two resistors. Then, if the pot is fully turned left, you got full cv control. If you turn it up, it will act like an offset i think? In case there is voltage present on both inputs of the summer, the output voltage can reach more than 2.5 volts, so you‘ll have to limit it somehow, maybe with a diode? Disclaimer: neither do i own the module nor do i have any substantial knowledge in electronics, so this is just a guess Afaik 'true input detection' is usually done in Eurorack via the ground connections supplied by the 3.5mm Jacks, which is not possible in AE. I think your circuit is almost good, only the passive 'summing' technique is not very stable, usually An active summing stage with an opamp is used. (Google 'opamp summer circuit' for some good info) I can imagine that digitally it might be possible: you monitor the pin, and if it is more than a certain threshold, eg 0.1V, you consider that this means a cable is connected. You would need to bias the pin to ground so it is surely at 0V when no cable is connected. |
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