With this mod, will the original VCO will always be still sounding?
I thought that when you plugged something in the original VCOs would be cut out so you only hear the external audio. Then when you unplug the cable, everything is back to normal?
How will it work?
VCF Audio mod from the mod page
Moderators: altitude, adafruit_support_bill, adafruit, phono, hamburgers
Please be positive and constructive with your questions and comments.
-
- Posts: 142
- Joined: Thu Jun 02, 2005 12:28 pm
I think the mod on the mods page would mix in the external audio with the waveform. However, moding the mod (a metamod!) would be pretty trivial.
One idea is to change the waveform switch from a 2 position to a 3 position. (it probably has some kinda fancy schmancy name... Dual Pole Triple Throw?). Another is to use a jack with a switch connector, and wire it up so that the output from the VCO is wired to the NC position. This would override the VCO whenever you plug something in.
I think the switch would be much more elegent.
One idea is to change the waveform switch from a 2 position to a 3 position. (it probably has some kinda fancy schmancy name... Dual Pole Triple Throw?). Another is to use a jack with a switch connector, and wire it up so that the output from the VCO is wired to the NC position. This would override the VCO whenever you plug something in.
I think the switch would be much more elegent.
-
- Posts: 142
- Joined: Thu Jun 02, 2005 12:28 pm
No.. the way I thought of doing it, it would just be selectable between Saw, Square and External.
I have a schematic here: http://wiki.jonnay.net/x0x/vcfmods
I have a schematic here: http://wiki.jonnay.net/x0x/vcfmods
-
- Posts: 82
- Joined: Fri Oct 21, 2005 9:37 pm
been discussing this mod with the guy who's building mine -
replacing the 2 way waveform selector switch with a 3 way one,
---
it would select between letting the saw pass, square pass and nothing pass
---
so when the switch is set to "nothing pass" and you have a jack plugged in, you only get extenal audio
and on the other settings, you get either saw or square mixed with the external
and if no jack is plugged in, only saw/square or silent on the 3 settings
replacing the 2 way waveform selector switch with a 3 way one,
---
it would select between letting the saw pass, square pass and nothing pass
---
so when the switch is set to "nothing pass" and you have a jack plugged in, you only get extenal audio
and on the other settings, you get either saw or square mixed with the external
and if no jack is plugged in, only saw/square or silent on the 3 settings
- controlvoltage
- Posts: 242
- Joined: Tue Aug 09, 2005 12:17 am
Like, yeah...
http://www.ladyada.net/forums/viewtopic.php?t=455
this mod may be untested on the x0xb0x but I think it's pretty standard & well-tested when it comes to TB303s. The illustration of this mod which I found on hyperreal is about 10 years old now.
I'll be trying it as soon as I find the right switch.
Oh and I think you want to mod the ext. in to run directly to the third position of the switch, rather than using the existing external in circuitry.
I might even add a diode buffer network to help shield the circuit from potential nastiness... rather than a completely straight wiring from input jack to switch. This might not be necessary, but shouldn't hurt either.
http://www.ladyada.net/forums/viewtopic.php?t=455
this mod may be untested on the x0xb0x but I think it's pretty standard & well-tested when it comes to TB303s. The illustration of this mod which I found on hyperreal is about 10 years old now.
I'll be trying it as soon as I find the right switch.
Oh and I think you want to mod the ext. in to run directly to the third position of the switch, rather than using the existing external in circuitry.
I might even add a diode buffer network to help shield the circuit from potential nastiness... rather than a completely straight wiring from input jack to switch. This might not be necessary, but shouldn't hurt either.
Please be positive and constructive with your questions and comments.