Showing posts with label Eurorack. Show all posts
Showing posts with label Eurorack. Show all posts

Tuesday, 17 April 2018

Zlob Dual VCA

As the old saying goes..
You can never have enough VCAs
Esp when they are only 2HP wide !!!!

These are some pics of my building of the Zlob Dual VCA
 These are not build notes. Just pics to help me remember should i want to build another one.
The official build notes are here:
https://zlobmodular.com/dual-vca/

There are no hard to find parts.
 The important thing to remember is to keep the height of all components as low as possible.
They need to fit behind a 2HP panel.
 So i bent these trimpots back.
The ICs need to be soldered directly to the PCB to keep their height down.
i ALSO bent the caps down and isolated them with shrink wrap


 Everything fits... beautiful.!!!

These trimpots need to be calibrated to close the VCAs... to prevent audio bleed. I did this by ear.
Works great.
I'll probably build some more.
:-)
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For more Euro DIY builds click here:
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Wednesday, 11 April 2018

Zlob Mini Mixer

You can never have too many mixers.
(Esp when they are only 2HP wide.)

I'm building a performance Euro case and these will come in very handy.
Zlob stuff is awesome and so cheap esp if you do it yourself.


I've built two already. Two more to go.
These aren't build notes. The official Zlob site with BOM is here:
https://zlobmodular.com/minimix-2/

20K SMD trimmers


oP Amps NE5532










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For more Euro DIY builds click here:
http://djjondent.blogspot.com.au/2017/12/diy-index.html
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Tuesday, 10 April 2018

RYO - Penta Sequencer - Ljunggren Audio

This is a really useful and compact Ljunggren Audio sequencer.
Just 5 steps, but its switchable to 4 & 3 steps.
I may end up using this more as a modulation source than a standard sequencer.
I purchased just the PCB and faceplate

The build is straight forward. Components are easy to find ... mostly mouser.
Just watch the height of the electro caps ... make sure you have enough clearance between the two boards. These are not build notes.
For detailed build notes check out Ljunggren Audio's great site.
http://ljunggrenaudio.com/products/sequencing.html

The sequencer can be powered off 15V (though I'm building this version for Euro's 12V standard).
You can also adjust the CV output voltage ranges. This sequencer is set to 0-5V but its possible to change it to ranges like 0-10V (Buchla ?? etc )
http://ljunggrenaudio.com/products/penta%20modifications.html

bELOW are some pics of the components I used.... from mouser.






The yellow electrical tape is a bit of protection against any shorts between the two boards .. the electro caps I used were too tall.

Leds.




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Second build:
I didn't remove the tall caps so had to somehow extend the length of the headers that connect PCBs
 I also used long shaft pots from Modular Addict.


 Nice. :-)

Links:
Muffs


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For more Euro DIY builds click here:
http://djjondent.blogspot.com.au/2017/12/diy-index.html
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Monday, 9 April 2018

NLC Triad - Build notes - Triple Envelope Generator

Looks like a nice compact EG module. It's in the Eurorack format.
It's a easy build too.

"These are AR or AD generators that will fire on a trigger or a gate, giving envelopes up to approx 25 seconds. A single gate to input 1 will fire all 3 envelopes, when nothing is plugged into inputs 2 & 3."

There are three envelopes in the one package.

Andrew's Blog notes are here:
http://nonlinearcircuits.blogspot.com.au/2015/11/triad-triple-envelope-generator.html

His Build guide is here:
http://www.sdiy.org/pinky/data/TRIAD%20build%20guide.pdf

If you are using a gate to trigger the envelope, once the attack stage is over the envelope will stay high until the gate finishes and then it begins the release stage.


When building remember that the LEDs are an integral part of the circuit.
Andrew recommends I use ultra-or super-bright LEDs. So depending upon the V ON of my LEDs,
I may need to have to adjust the  LED resistors (1k or 4k7 resistors) to get envelopes hitting the desired voltage. The target is to get 5-7V envelopes.



Each module used three 555 timer chips.



Andrew recommends using 22μF capacitors to get envelopes lasting approx. 25 seconds.
I'll stick with this on this build. I guess you can use larger caps if you want longer envelopes or smaller caps for shorter ones. I have two more triad PCBs to build and might experiment with cap sizes (even on the same board) on these later builds.

I usually put the ICs on first, then the rest of the passive SMD.
 pOTS & jacks next.
LEDs
Don't forget the ground leads on the jacks.
Nice !

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Build 2
The LEDs make a big difference to the final voltages
I built a second Triad using green LEDS
The voltage ranges were between 5V and 8V

 




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You can find more NLC builds here.
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Saturday, 7 April 2018

bASTL - Grandpa expander - sampler -spa

Some additional pics to help building the expander for the Bastl Grandpa sampler module.
This is a great little sampler in Euro format.
The official notes are here:
http://www.bastl-instruments.com/modular/grandpa/spa/









Very very nice.

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For more Euro DIY builds click here:
http://djjondent.blogspot.com.au/2017/12/diy-index.html
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