M-110 Linear FM modification

Repair or Modifications of the Roland System 100M
ryk
Posts: 117
Joined: Wed Sep 26, 2007 2:14 pm
Location: London
Contact:

M-110 Linear FM modification

Postby ryk » Sun Jul 27, 2008 5:37 pm

Hello

Here are some pictures showing how to
modify the M-110 for Linear FM.
It uses the 2nd mod socket on the VCO as
a Linear FM input.


INSTRUCTIONS:

Cut the track on the control panel pcb, shown
in pic1.
Then solder a 47k resistor, onto the indicated pad.
Solder a 100n capacitor in series with the resistor.
Solder a wire from the capacitor to IC3 Pin2, as
shown in pic2.

The 47k resistor gives a nice depth range for FM,
With this value you can set the mod depth to about "8" for
stable FM from direct output of another osc.
Higher mod depth gives more unstable fun !!

-ryk
Attachments
110_LIN_FM_Mod_2.jpg
View of Main PCB
110_LIN_FM_Mod_2.jpg (322.27 KiB) Viewed 14580 times
110_LIN_FM_Mod_1.jpg
View of Panel PCB
110_LIN_FM_Mod_1.jpg (329.62 KiB) Viewed 14580 times

sjones
Posts: 118
Joined: Mon Sep 24, 2007 6:46 am

Postby sjones » Tue Jul 29, 2008 3:22 am

Thank you for posting this. I'll mod both of my 110s for sure, but I think I'm going
to install a switch on the back of the module so that I can have the second input be just normal mod. If I do that, I'll provide follow up photos.

synth_ollie
Posts: 157
Joined: Tue Sep 25, 2007 7:52 am
Location: 100M City, Sweden

Postby synth_ollie » Wed Aug 06, 2008 9:18 pm

yep, nice to see more 100m mods, thanks ! :)

sjones
Posts: 118
Joined: Mon Sep 24, 2007 6:46 am

100J multiple jacks vs. buffered mixers

Postby sjones » Thu Aug 07, 2008 4:14 am

On the 100J there are 36 multiple jacks (9 x 4) and if you understand how multiple jacks can work the more you load them up the more signal loss. For instance, if you've ever run a MIDI to CV output into a multiple and then on to a few oscillators you'll notice a voltage drop with each oscillator modulation source you plug in to.

I'm going to be working on a way to convert a 100J's multiple jack section to a buffered mixer. This shouldn't be too difficult and would use the existing jacks.
If anyone else would be interested in this modification, please follow up here.

synth_ollie
Posts: 157
Joined: Tue Sep 25, 2007 7:52 am
Location: 100M City, Sweden

Postby synth_ollie » Thu Aug 07, 2008 8:35 am

yep, been thinking about this too, you just need an op amp for each channel, something like this:

Image

sjones
Posts: 118
Joined: Mon Sep 24, 2007 6:46 am

Postby sjones » Fri Aug 08, 2008 6:00 am

I'm going to pursue this and come up with a PCB design that can be mounted
in a 100J and wired in by an end user.

dieting
Posts: 1
Joined: Mon Jan 05, 2015 12:03 pm

Re: M-110 Linear FM modification

Postby dieting » Mon Jan 05, 2015 12:54 pm

if you've ever run a MIDI to CV output into a multiple and then on to a few oscillators you'll notice a voltage drop with each oscillator modulation source you plug in to. ??
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ryk
Posts: 117
Joined: Wed Sep 26, 2007 2:14 pm
Location: London
Contact:

Re: M-110 Linear FM modification

Postby ryk » Mon Jan 05, 2015 2:15 pm

dieting wrote:if you've ever run a MIDI to CV output into a multiple and then on to a few oscillators you'll notice a voltage drop with each oscillator modulation source you plug in to. ??


Depends on the CV converter.

Which MIDI2CV box are you using ?

-ryk


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