log: building Oakley modules in dotcom format

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kdjupdal
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log: building Oakley modules in dotcom format

Post by kdjupdal » Sun Nov 01, 2020 11:50 am

I've decided to build a couple of Oakley modules for my dotcom format synthesizer. No problems yet - just thought I would write a small log. I have built a few modules before, so I'm confident that it will turn out well.

I had forgotten how much time it takes, though. Ordering parts, sifting through parts, soldering... Soldering is fun, but I work carefully and very slowly.

So far I have soldered the Dual LFO and an ADSR.
20201101_154403.jpg

kdjupdal
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Re: log: building Oakley modules in dotcom format

Post by kdjupdal » Thu Nov 12, 2020 12:12 pm

I have never used the pot brackets before. I realise that I should have fixed the pots to the panel, before soldering the pots, to ensure they are evenly lined up. Or how do you normally do that?

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Re: log: building Oakley modules in dotcom format

Post by Leverkusen » Thu Nov 12, 2020 12:28 pm

I think I usually solder one of the pins of the pot brackets with post and bracket placed on the PCB and then screw the pots to the panel, get it in a nice angel and solder the rest of the pins. Wait, or do I start by solderin one pin of the pots? Anyway, yes fixing them to the panel before doing the whole soldering is the key for having pots, PCB and panel in the right angles to each other. After that I do the LED's and switches, again first attaching them to the panel and then soldering them to the PCB. I love it when panel and PCB come together and suddenly look like a real thing.

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Re: log: building Oakley modules in dotcom format

Post by Synthbuilder » Fri Nov 13, 2020 4:28 am

kdjupdal wrote:
Thu Nov 12, 2020 12:12 pm
Or how do you normally do that?
The way I do it now is to fit the bracket to the pot and hold it lightly in place with the pot nut. Then I place all the pots, with their brackets if they have them, into the PCB. The board is then upturned and just the middle pin of each pot soldered. I then gently bend the pots that aren't sitting at the correct angle and remove all the nuts holding the brackets to the pots. The pots are then inserted into the panel and the PCB is gently aligned to be ninety degrees to the panel. For each pot I then solder the two outer pins. When all the pots are soldered I then reflow the middle pin of each pot. This prevents any unwanted force remaining on the middle pin when the pots were aligned with the panel. You can sometimes see the pin move a little when the solder is melted.

Now I test the board. If all the pots work, then I solder the pot brackets.

This is slightly different to the method given in the Oakley Sound Construction Manual. I have plans to update the Manual over the next couple of months - it's been a while since it's had an edit.

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Re: log: building Oakley modules in dotcom format

Post by kdjupdal » Sun Nov 15, 2020 9:42 am

I have just testet the ADSR and it works perfectly! Some of the things that I like about this envelope generator is the linear attack and exponential decay. Also the exponential response of the pots.

I am designing a panel myself. Inspired by the moog 911 design, I wanted to show the time in seconds and ms on the panel. So I need to measure the attack and decay times at different settings. I tried to do it by ear, but I realise it is almost impossible without an oscilloscope, so I should get one. I tried to measure 1 second attack time - seems like it is somewhere where the pot is set on the photo.
20201115_151528.jpg
Last edited by kdjupdal on Sat Nov 21, 2020 6:05 pm, edited 1 time in total.

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Re: log: building Oakley modules in dotcom format

Post by kdjupdal » Mon Nov 16, 2020 4:10 pm

I am pondering one idea - is the ADSR out really necessary, and what would I lose if I left it out, keeping only 3 jacks? The VCA out will give the ADSR out signal when the VCA is not used, and when it is used you'd want to use the VCA out anyway. Or what do you think?

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Re: log: building Oakley modules in dotcom format

Post by Leverkusen » Mon Nov 16, 2020 4:19 pm

Sometimes I use the same envelope that going to the VCA for the filter or a waveshaper or another VCA for FM or LFO amount. What would you gain saving one jack?

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Re: log: building Oakley modules in dotcom format

Post by kdjupdal » Thu Nov 26, 2020 8:50 am

I've designed a panel for the ADSR and the VC-ADSR. I already built one ADSR, and I decided to change a capacitor and a resistor (on advice from Tony) to achieve slightly less extreme range. Anyway, I measured the times of my module and included them on the panel. Don't know if it is practical or not... it will of course be approximate.

What do you think?

As for an adsr-out jack... on the VC-ADSR I have space on the panel, but I could also mult the vca-out jack and have two identical outs? That could also be useful.
Oakley-ADSR.png
Oakley-VC-ADSR.png
Last edited by kdjupdal on Thu Nov 26, 2020 4:20 pm, edited 1 time in total.

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Re: log: building Oakley modules in dotcom format

Post by Leverkusen » Thu Nov 26, 2020 2:51 pm

I like the ring dials! The logarithmic looking scale makes it feel so scientific. 8-)

How did you design them? I am about to make some MU panels too for my next Oakley builds, actually the panels are already done and some are also painted black and in blind panel state. But I struggle a bit to find a way to design the scales that is not overly complicated. Or would you mind sharing your templates?

Also why did you condense it in a way that three jacks seem to be better than four? I understand that you don't need the fourt output, but would be interested to learn why you prefer it that way?

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Re: log: building Oakley modules in dotcom format

Post by kdjupdal » Thu Nov 26, 2020 4:12 pm

Leverkusen wrote:
Thu Nov 26, 2020 2:51 pm
I like the ring dials! The logarithmic looking scale makes it feel so scientific. 8-)

How did you design them? I am about to make some MU panels too for my next Oakley builds, actually the panels are already done and some are also painted black and in blind panel state. But I struggle a bit to find a way to design the scales that is not overly complicated. Or would you mind sharing your templates?
I use a free design software called "GravitDesigner". With this kind of software you can do a lot, but it takes time to learn it, so for the tick marks I have to admit I used the files on the yusynth website as template. Anyway, I can share my designs if you want to use them as templates.
Also why did you condense it in a way that three jacks seem to be better than four? I understand that you don't need the fourt output, but would be interested to learn why you prefer it that way?
To have space for the module name on the top, and I like the more simple design.

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Re: log: building Oakley modules in dotcom format

Post by sonoresstudios » Mon Nov 30, 2020 12:27 pm

What is your plan for the manufacturing of the panels? engraving? silk screened?

I have made prototype panels made of plexiglas and printed paper for labelling, for now...but i want aluminum. Not sure which way to go for text etc.

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Re: log: building Oakley modules in dotcom format

Post by kdjupdal » Mon Nov 30, 2020 4:28 pm

I plan to have them made for me by someone... there are several now that offer to make MU panels.

sonoresstudios
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Re: log: building Oakley modules in dotcom format

Post by sonoresstudios » Mon Nov 30, 2020 4:55 pm

Do you have any links?

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