2019/2020 BUILD PHOTOS

vladosh · Posted: Tue Sep 24, 2019 8:04 am Post subject:

i print it on aluminum at a printing house ,drilled it myself

AlanP · Posted: Fri Oct 11, 2019 3:09 pm Post subject:

LFLabs, finally finished those VCAs you sent me Smile

And this last photo is for Dave Skrog --

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cslammy · Posted: Mon Oct 14, 2019 6:55 am Post subject:

AlanP · Posted: Fri Nov 01, 2019 7:24 pm Post subject:

Eurorack copy of the Buchla 258 Dual Oscillator. Very easy to get a good sound out of this.

This particular PCB set uses the THAT340 transistor array, working off Mark Verbos' annotated schematic. I've got a set of PCBs that use BC8x7DS matched pairs instead (cheaper), and will verify them in a few days.

AlanP · Posted: Sun Nov 03, 2019 9:19 pm Post subject:

Arpad Benares' touch controller from Synapse Magazine. This was a pseudonym for Serge, and it's a very responsive touch controller indeed!

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Provided, of course, that I don't screw up. I had three resistors in the small oscillator going to ground, and not -12V, and I ran out of 22M resistors (hence the two in parallel on the back. I also had the ICs far too close to the header pins, and had to actually slide them forward as much as the sockets would let me. To do this, I had to desolder the power smoothing caps and angle them forward a bit.

LektroiD · Posted: Mon Nov 11, 2019 7:49 pm Post subject:

System 100 clone, built with Pharmasonic PCBs...

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PHOBoS · Posted: Wed Nov 13, 2019 6:51 pm Post subject:

that's a lovely looking synth Very Happy

AlanP · Posted: Sat Nov 23, 2019 1:15 pm Post subject:

Voiced/Unvoiced Detector, built from the Doepfer module's schematics. Originally did this for someone in 2017, finally got around to building one for myself.

I think the wires for the pots was why I put it off. I can do crimped connectors... they're just a fiddly pain in the posterior to actually do, for me.

kaputtpanzer · Posted: Tue Dec 10, 2019 6:03 am Post subject:

I showed that one before, but now it got a frontpanel. Design wise it is still not finished. At first sight I was really satisfied with the edges, but then I decided to try out rounded edges on other boards and I liked it more. So I will make another run of pcbs and panels I guess Laughing

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cslammy · Posted: Tue Dec 10, 2019 7:28 am Post subject: Diode VCF LPF (EFM clone)

Blog post:
http://audiodiwhy.blogspot.com/2019/03/efm-diode-filter-where-have-you-gone.html

Website: https://www.charlielamm.com/gear/vcf/forums.html#emf-diode

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richardc64 · Posted: Mon Dec 30, 2019 8:55 pm Post subject:

Under the wire...

I used a sewing machine speed control pedal, stripped of everything except slide pot and lever microswitch to voltage control the decay of a HiHat circuit. It worked well electronically. but the action didn't feel right physically, even after I added a heel rest.

The foot plate from a damaged acoustic HiHat, some wood, rubber, and a big spring gave me something that feels more like operating an actually HH.

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The microswitch can be used with circuits that require off-on/open-closed. A slide switch selects Tip and Sleeve closure, or Ring and Sleeve, as used by some manufacturers.

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cslammy · Posted: Wed Jan 15, 2020 7:34 am Post subject:

cslammy · Posted: Wed Jan 15, 2020 7:38 am Post subject:

cslammy · Posted: Wed Jan 15, 2020 7:40 am Post subject:

cslammy

blog post
http://audiodiwhy.blogspot.com/2019/05/hammer-cocktail-low-parts-count-4069ub.html

Website
https://www.charlielamm.com/gear/vcf/forums.html#4069

Based on this orig EM post from "hammer"
http://electro-music.com/forum/topic-69887.html

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AlanP · Posted: Wed Jan 15, 2020 8:36 am Post subject:

sompost · Joined: Aug 17, 2010 Posts: 57 Location: Switzerland

Grumble · Posted: Sun Mar 29, 2020 12:47 pm Post subject:

Drum sequencer, first 4 channels pure digital, the next 4 are outputs of a quad 16bit DAC.
Module is powered by a bluepill STM32F103.

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PHOBoS · Posted: Mon Mar 30, 2020 1:50 pm Post subject:

looks great grumble Smile

I have a bluepill to play around with here, what do you use for level shifting ? (3.3.V <> 5V)

Grumble · Posted: Mon Mar 30, 2020 2:27 pm Post subject:

For the digital outputs I just use a 74LS08, works perfectly.
For the last 4 channels I use a quad DAC which accepts 3.3 volt digital signal, and puts out 0 to 5 volt. The rest of the components like the display etc. are 3.3 volt compatible.
At the moment I’m working on the software, when that works I will open a thread with schematics and some explanation how things work.
For this project I use the Arduino IDE.
I just realise that I just have outputs and no inputs... guess I have to make a secondary panel with trigger in and outputs...😱

PHOBoS · Posted: Mon Mar 30, 2020 3:37 pm Post subject:

oh interesting, I just checked the datasheet for the 74LS08 and it says the mininum high voltage level is 2V. yeah that'll work, cool
Did you get the arduino IDE working with USB ? I did manage to upload a sketch through FTDI but haven't been able to load an arduino bootloader on it.
and yeah, I did notice the lack of inputs, and the fancy goldplated connectors Shocked

Grumble · Posted: Mon Mar 30, 2020 11:13 pm Post subject:

I used this set,didn’t bother uploading a bootloader.
This set cost me less than 3€ and just the blue pill board about 1€50 (less than a knock-off Nano.

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PHOBoS · Posted: Tue Mar 31, 2020 7:21 am Post subject:

Thanks.
I have one those too but since I wasn't 100% sure if it would work and didn't want to risk having to wait another month or so
I also ordered one of those FTDI boards right away, which I believe was only $0,75. But good to know that one works too.
Yeah the blue pill boards are damn cheap and with those specs a nano doesn't even come close but I do like the convenience
of only needing a USB cable and not having to mess around with different voltages and/or jumper settings.

One more question before I derail this thread too much; why the red buttons in those places, was that purely an aesthetic choice ?

Grumble · Posted: Tue Mar 31, 2020 8:44 am Post subject:

I plan to have midi implemented as well, and the buttons can serve as a keyboard input (could have used black caps instead of the red ones Wink

)
And the “fancy” gold plated connectors are the same price as the metal ones and are there to discriminate between triggers and analog outputs.

PHOBoS · Posted: Tue Mar 31, 2020 11:29 am Post subject:

ah that makes sense. I was looking at it as a drum controller and it made more sense to me to use them for steps 1,5,9,13.
It does remind me of a MIDI controller I made in 2013 but never completely finished and I don't think I ever posted any photos before.
It is functional though and I used it to create some albino