Search found 53 matches

by kdmr
Sun Jan 10, 2021 8:24 am
Forum: Music Tech DIY
Topic: Hammond organ foot pedal controller conversion
Replies: 14
Views: 386

Re: Hammond organ foot pedal controller conversion

Got her working last night. Ended up opting for a set of DG411 to deal with the NC switches. I need to redesign the board...left pulldown resistors off the first version mostly because I am an idiot so I have an extra stripboard shoved in to accommodate. Will post some more pictures of the switch bu...
by kdmr
Wed Dec 30, 2020 7:06 pm
Forum: General Gear
Topic: QuNexus v/oct issues
Replies: 0
Views: 92

QuNexus v/oct issues

Sorry if this has been covered...couldn't find it in the search. Do these things just not track accurately? I have fiddled around in the editor for hours and can not get mine to give me 1v/oct out. Lowest voltage I can get messing with the offset is 0.013v and then going up octaves the closest I can...
by kdmr
Thu Dec 03, 2020 4:06 pm
Forum: Music Tech DIY
Topic: Hammond organ foot pedal controller conversion
Replies: 14
Views: 386

Re: Hammond organ foot pedal controller conversion

KSS wrote:
Wed Dec 02, 2020 8:00 pm
kdmr wrote:
Wed Dec 02, 2020 2:03 pm
I think you're looking at the wrong piece
Am I? You do realize these are normally closed switches? The three tines to the u-shaped piece in the wafer stack are the contacts.
Yes, they are NC and yes I mislabelled them but I WON'T APOLOGIZE
by kdmr
Wed Dec 02, 2020 2:04 pm
Forum: Music Tech DIY
Topic: Hammond organ foot pedal controller conversion
Replies: 14
Views: 386

Re: Hammond organ foot pedal controller conversion

Do you only get single-action normally open contact, one per note on those things? If so, you might look at Moog Taurus schematics. I think they impose a high-frequency signal on the CV output that is detected to provide trigger/gate for the pitch CV S&H. The HF signal is easily filtered out of the...
by kdmr
Wed Dec 02, 2020 2:03 pm
Forum: Music Tech DIY
Topic: Hammond organ foot pedal controller conversion
Replies: 14
Views: 386

Re: Hammond organ foot pedal controller conversion

KSS wrote:
Wed Dec 02, 2020 2:38 am
Looks like the light blue O and C labels are backwards? The triple contact fingers on the O photo are contacting the leaf below while in the C pic they're clearly bent away from it?
I think you're looking at the wrong piece
by kdmr
Tue Dec 01, 2020 1:14 pm
Forum: Music Tech DIY
Topic: Hammond organ foot pedal controller conversion
Replies: 14
Views: 386

Re: Hammond organ foot pedal controller conversion

The strip is about 2 inches long, give or take (couldn't get a proper measurement since it was snapped), 4 mm wide and about 1 mm thick. I tried a few really bad mends (one pictured) and the realized that I had some decently stiff plastic stock in the form of LP dividers filed into my record collect...
by kdmr
Tue Dec 01, 2020 1:08 pm
Forum: Music Tech DIY
Topic: Hammond organ foot pedal controller conversion
Replies: 14
Views: 386

Re: Hammond organ foot pedal controller conversion

First repair. There is a small plastic strip that throws each switch. One of these was snapped at the top, preventing the switch contacts from shorting. Normal operation is illustrated in the pictures(C= closed, O= open). The plastic strip is situated between the pedal assembly and the switch contac...
by kdmr
Tue Dec 01, 2020 12:58 pm
Forum: Music Tech DIY
Topic: Hammond organ foot pedal controller conversion
Replies: 14
Views: 386

Re: Hammond organ foot pedal controller conversion

This is the unit I snagged. Luckily most of the mechanical bits were working as they should.
by kdmr
Tue Dec 01, 2020 12:33 pm
Forum: Music Tech DIY
Topic: Hammond organ foot pedal controller conversion
Replies: 14
Views: 386

Re: Hammond organ foot pedal controller conversion

Cool. I had a BV organ with a complete set of pedals, bench and Leslie251. Organ is gone but those pedals were dangerous. The metal contact strips were sharp. Gotta watch out. Also very heavy and bulky. Be careful. I've already gone through and cleaned and repaired some of the mechanicals. Definite...
by kdmr
Tue Dec 01, 2020 12:23 pm
Forum: Music Tech DIY
Topic: Hammond organ foot pedal controller conversion
Replies: 14
Views: 386

Hammond organ foot pedal controller conversion

Stumbled upon a set of bass pedals from an old hammond in the junk pile. I've had my eye out for a long while for a set to make into a v/oct controller. I searched around for a bit and couldn't find a whole lot by way of other folks doing the conversion so I figured I'd post a build doc as I work on...
by kdmr
Mon Sep 28, 2020 5:53 pm
Forum: Music Tech DIY
Topic: User addressed sequencer/switch?
Replies: 2
Views: 136

User addressed sequencer/switch?

Trying to brainstorm on a "sequencer" with steps that can be gate addressed a la serge tkb, elby 23, etc. Is there an ic out there that can be used for arbitrary switching? I feel like I'm forgetting something obvious.
by kdmr
Sat Sep 12, 2020 11:32 am
Forum: Music Tech DIY
Topic: Electrosmith 3340 vco sanity check
Replies: 0
Views: 132

Electrosmith 3340 vco sanity check

I built two of these guys under a panel and they are both exhibiting the following weirdness. They both used to check out on the scope. I was patching a few nights ago and noticed that my linear fm behavior was off, like kind of stepped voltages with a triangle in with maybe 3 steps per slope. Threw...
by kdmr
Wed Sep 20, 2017 3:17 pm
Forum: General Gear
Topic: QuNexus presets
Replies: 1
Views: 400

QuNexus presets

Who is the QuNexus preset wizard? Trying to make a preset that assigns pressure to cv2 and tilt to cv3 but i dont want tilt to bend pitch. I know i'm just missing something really obvious in the editor, but i havent had any luck fiddling with it. I'm not using the expander. Other than that, anyone h...
by kdmr
Sat May 20, 2017 5:56 pm
Forum: Music Tech DIY
Topic: Front Panel Express template graphics
Replies: 5
Views: 517

i'm working mainly in euro, but what i'm looking for isn't necessarily specific...rotary indicators for pots/switches, generic wave shape icons, etc. i know i could source all this stuff but i was hoping someone had a tip for a library of images that i can just upload into FPE.
by kdmr
Sat May 20, 2017 3:21 pm
Forum: Music Tech DIY
Topic: Front Panel Express template graphics
Replies: 5
Views: 517

Front Panel Express template graphics

I know the answer to this is going to be painfully obvious but I've done a fair amount of searching the forum and elsewhere and am coming up with not much. Where are you all sourcing the drilling/printing icons for your diy panels? I feel like there must be a zip file out there with a library of com...
by kdmr
Wed Feb 08, 2017 4:55 pm
Forum: Music Tech DIY
Topic: Gates behaving badly (or, the trigger-loving Soundlab)
Replies: 10
Views: 540

I'm wondering if q14/q16 are doing something weird. Those are removed from the path when in trigger mode...Still doesn't explain why everything works with no gate source patched.
by kdmr
Wed Feb 08, 2017 4:53 pm
Forum: Music Tech DIY
Topic: Gates behaving badly (or, the trigger-loving Soundlab)
Replies: 10
Views: 540

That's an interesting idea. The sources ive been using are the MFOS 16step (same case, same PS) and a homebrew keyboard (different case, different PS). I was hoping it was just a grounding issue from the keyboard circuit but the behavior persists with the sequencer gates.
by kdmr
Wed Feb 08, 2017 4:36 pm
Forum: Music Tech DIY
Topic: Gates behaving badly (or, the trigger-loving Soundlab)
Replies: 10
Views: 540

That's what's driving me crazy!
by kdmr
Wed Feb 08, 2017 4:06 pm
Forum: Music Tech DIY
Topic: Gates behaving badly (or, the trigger-loving Soundlab)
Replies: 10
Views: 540

Ha! Trust me this thing is super fun for boopin/boppin. The functional definition of "raising the floor" is exemplified with vca modulation. With no gate source patched and full CW on AD modulation pot, it's quiet as a mouse until I introduce a gate via the manual gate button. When I patch a gate so...
by kdmr
Wed Feb 08, 2017 7:10 am
Forum: Music Tech DIY
Topic: Gates behaving badly (or, the trigger-loving Soundlab)
Replies: 10
Views: 540

Gates behaving badly (or, the trigger-loving Soundlab)

Been ironing out a weirdness in my MFOS Soundlab MKII for a while now and I feel like I'm out of ideas. Said weirdness is happening to the AD generators (testing has shown it to be apparent in both envelopes) and goes like this: -All automatic modes (set rate, and s&h rate) work fine in gate and tri...
by kdmr
Mon Jan 16, 2017 8:26 am
Forum: Music Tech DIY
Topic: PCB mount connectors
Replies: 3
Views: 346

wow how did i miss those?

thanks.
by kdmr
Mon Jan 16, 2017 7:58 am
Forum: Music Tech DIY
Topic: PCB mount connectors
Replies: 3
Views: 346

PCB mount connectors

Hey all, I'm doing a few custom power distribution stripboards for some DIY cases for use in conjunction with some MFOS power supplies. +/- in and ground strips routed to 10-pin, and 16-pin euro and MOTM headers. Sourcing the power headers is no problem but now I'm on the hunt for some pcb-mount scr...
by kdmr
Sun Jan 01, 2017 8:37 pm
Forum: Music Tech DIY
Topic: CGS04 wiring options
Replies: 4
Views: 257

did a quick layout to experiment with the circuit. i mean QUICK so there might be an error. had to space out the components so the text wouldntbe obscured too badly. should crunch down to about 17x8 when i populate the board. i'll verify that it works in case anyone out there wants to experiment wit...
by kdmr
Sun Jan 01, 2017 9:17 am
Forum: Music Tech DIY
Topic: CGS04 wiring options
Replies: 4
Views: 257

Oh duh. Yeah I see node A now. And yeah the inverter input happens in the red section.
by kdmr
Sun Jan 01, 2017 8:10 am
Forum: Music Tech DIY
Topic: CGS04 wiring options
Replies: 4
Views: 257

CGS04 wiring options

Doing a pair of these for a controller I'm building and just wanted to run this past the forum before I start wiring. Obviously a straightforward design, but wanted to ask anyone with experience what they have found to be useful wiring options for these circuits. These will mainly be for transposing...

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