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Hardware Instruments => MatrixBrute => MatrixBrute - Feature requests => Topic started by: SoundRider on March 24, 2017, 09:05:15 am

Title: "General purpose CV Input", which is available as mod-source at the matrix?
Post by: SoundRider on March 24, 2017, 09:05:15 am

Since all CV inputs/outputs on the back of the intrument are linked to a destination source, it would be great, if there was at least one external CV input, which would be available on the matrix as a flexible modulation source.

Since this is a hardware issue, it could be too late to be implemented, but it would be great, if there was an opportunity.

Question: Can we use the ext1 or ext2 external inputs to connect to an external CV without causing damage? I know that both sockets have a supply voltage of 3.3V for the pedals. Since both (pedal) inputs are in the matrix, combined with macro knob 3 and 4, we could theoretically use this to a purpose, which originally wasn't intended?

Title: Re: "General purpose CV Input", which is available as mod-source at the matrix?
Post by: DrJustice on March 24, 2017, 02:32:38 pm

Good point! I reckon the expression pedal inputs can safely be used as general purpose CVs inputs to the matrix.

Looking at the IO board, there's an LPC2366 which has a 10bit ADC, and there's circuitry near the expression pedal inputs which include a diode and some resistors that may be taking care of current limiting and overvoltage protection - so probably not "dangerous" at all. The voltage range could be extended by using a voltage divider (two resistors or a potentiometer).

Title: Re: "General purpose CV Input", which is available as mod-source at the matrix?
Post by: SoundRider on March 24, 2017, 03:01:53 pm

Thanks for your reply ... I think, I will make an adapter, stereo to mono, where the 3.3V is just unused. This way there will be no risk to connect a voltage source to another source ;)

Title: Re: "General purpose CV Input", which is available as mod-source at the matrix?
Post by: Patate le mage on March 24, 2017, 04:25:51 pm

Hi, i tried it with an lfo on my modular system wich go thru an attenuator ( so ut didn't go further 3.3 V ) and into the EXP1 pedal input and it's perfectly ok. I also try with a VCO or a sequencer and it's OK. Nice idea from you guys, i was also a little bit frustated that i couldn't go on multiples destinations ( and others destinations ) with my modular.
The only problem is that it doesn't interpret negatives voltage so i ha ve to offset it before i send it to MB