Tindie

I used this to build the Elliot Sound Products digital noise generator. There's *just* enough room on the board for it. I made use of some surface mount parts on the backside to make it fit. Having only five control/jack mounting spots is limiting, since the typical 'gate', 'cv', and 'output' jacks leave you with only two pots. I'd like to see a version which gets rid of the between-pot holes and fits in another two pot/jack spaces. With seven spots, you could do more complex projects.
A surface-mount-only version might be useful. Have a chip mounting area in the center with SOIC spacing for leads, and have the rest be pads for 0603 and 0805 parts. The reality is it is getting harder and harder to source through-hole parts.

Kalle | May 5, 2021

Delivers the simple bleeb bloobs

For Simple VCO

Cheap 1v/oct oscillator is rare. This is easy kit for basic module for beginner. The low price gives you chance to build row of 10 if you wanna drone your way. My only trouble was sourcing some components. Potentimeters used in the module are not that common in Finland. So I had to modify another type of pot.

Response from Electronic things... and stuff | May 5, 2021

Thank you for your feedback!

The potentiometers are the regular 9mm "Alpha" Right angle/PCB mount.
They are the *de-facto* standard in all Eurorack Modules nowadays.

You can find them in numerous places on Internet: Thonk, Synthcube, Musikding, Smallbear Elec, Mouser, Tayda, etc...

https://www.thonk.co.uk/shop/alpha-9mm-pots/
https://synthcube.com/cart/synth-diy/parts/potentiometers/alpha-9mm-round-shaft-pc-mount-pots
https://www.musikding.de/Potentiometer-9mm_1
https://www.mouser.com/Search/Refine?Keyword=rd901f
https://www.taydaelectronics.com/potentiometer-variable-resistors/rotary-potentiometer/linear.html

There are many compatible brands (BI/TT, Alps, etc).

And if the value you're looking for isn't available, you can use other values as well, as long as the circuit can tolerate that change. As a matter of fact, many volume/voltage divider circuits are insensitive to the absolute ohm's value. In these circuits, only the ratio matters.
For instance, if you can't find R2 (100k), you can substitute it with a 10k ohm potentiometer. But in this case you must also modify R1 and R3 values: if R2 value has been divided by 10, then R1 and R3 values must also be divided by 10: 1k ohm each.

Have fun!

Daryll | April 10, 2021

perfect for what it does

If you dont want/need CV control , then this is the LFO for you , small , neat , with easy to find components ( if you like DIY) , lends its self to the 5U format , because of the choice of pots ( 9mm or 16mm) , I have nothing but praise for this excellent product , fully complements the simple VCO

Daryll | March 8, 2021

Superb VCO

For Simple VCO

Ok , so its a bare minimum VCO , but that does not distract from the Quality , it took about a hour to solder up , plugged it in , worked first time , calibration was easy
Coupled with the LFO , we have a cheap , but excellent VCO , with modulation from the LFO , what more can you ask for , parts count is low , with easy to obtain parts , you could build several of these as a base of a monster synth , and it wont cost the earth , all together a very useful project , and a must have VCO

Response from Electronic things... and stuff | May 5, 2021

Thank you Daryll for your kind words and your support!
I wish you a lot of fun!

Daryll | March 8, 2021

does exactly what is says

I needed a euro power bus for my modular synth , I also have a +-15 volt supply as well , yes a right old mixture , the euro power bus was easy to solder up , good documentation mean the parts were well marked , I didn't need the 5v option , so a quick word with David , he showed me what components to leave out , as the title says , it does exactly what is says , delivering +-12v to my modules , very well made PCB , I look forward to seeing what David comes up with next..

Mark | Feb. 28, 2021

Brilliant; just add inspiration!

I used to convert schematic designs for synthesizer modules with PCB Wizard3; then get the boards produced in an excellent professional way by Elecrow in China.

However, my PCB Wizard3 developed a permanent fault so I needed to find an alternative, cost effective way to produce boards.

The David Haillant prototyping board is the solution, accommodating all of my designs; mostly with a single board, occasionally double-stacked.

Using PAINT 3D on my computer, I can draw up the layout using different coloured rectangles and lines to represent the components.

I tend to use the mounting holes for attaching to front panels using, the dedicated 'pot' pads as extra component space.

The process of producing a board is much more fun than a cryptic crossword!

Herman | Sept. 19, 2020

great module with top price/quality ratio.

For Attenuator-Inverter Module

Great module for a good price. I have two for a dual attenuvator (4hp). I tested it with my scope and ... no unwanted artefacts like noise etc.
Tip: Buy two.

Herman | Sept. 6, 2020

Great blanc panel. with 5 holes..

For 5-Hole Eurorack generic front panel

Great blanc panel. with 5 holes...Looks great with the right seizes... Handy for d.i.y. eurorack builders....

Response from Electronic things... and stuff | Sept. 6, 2020

Thank you Herman!
I'd love to see your builds. Have fun!
David

Johannes | Sept. 2, 2020

Great Kit

Have build some modules before but mostly passive or very simple active stuff. I purchased PCB only and sourced parts myself. Parts are all easy to find and well documented. LFO worked immedeatly and was easy to assemble and solder. Communication with David was great, he was very friendly and helpfull.

Jared | July 31, 2020

I love it

SO easy to source parts and great measurements on the front panel if you wanna make your own, I found that really handy. I got the v1.4 and was a little confused about documentation, maybe the v1.4 documentation exists, or seller probably provides it if you ask, but i didn't need it anyway, just read the silkscreen and look at the product pics.
Very useful LFO, and it really is simple. I used multilayer ceramic capacitors and I still get a really clean signal.
5/5 product, shipping took a while, but it's from france, and im in new zealand, and it's also covid times so still very reasonable :)
Love it, thank you!

Herman | June 20, 2020

Great power bus for my 6u 104hp euro rack.

For Eurorack Power Bus - 26

Great power bus for my 6u 104hp euro rack. I have replaced my three home made boards with this one and 1 small home made board.
The size is perfect and the component are good quality.

One small minus point. Leds on the board polarity signs are not so clear.. I need to look at the wiki for leds connections. In 5 minutes.. problem solved.

Response from Electronic things... and stuff | June 21, 2020

Thank you Herman, I take note of your comment. I'll see what I can do to improve the silkscreen or the documentation. The square shaped pads are the cathodes of the LEDs (shorter legs).

Costantino | July 17, 2019

The heart of my new DIY modular synth

I started building my own DIY modular synth and I used this power bus board to supply my module.
Really a great project!!! Easy to build and well documented!

Costantino | July 17, 2019

My first Eurorack module

I started to build my DIY modular synth from this amazing project. It was a great experience: it is a really simple starting point to learn how to build a module, even if I have to admit that I have a quite long soldering practice. I have also made my own front panel with a laser cutter and a wood panel.
The sound is great!!! I really like this LFO. The only limitation is that the frequency can be changed only by hand with the knob: no external CV modulation.
I really suggest this module if you want to learn how to create your own synth.

Response from Electronic things... and stuff | Sept. 18, 2019

Thank you very much Constantino! I'd love to see your build :)
Have fun!

Adam | Oct. 29, 2018

Great little DC power supply

For Mini Dual Power Supply

I'm relatively new to electronics DIY. I was able to follow the instructions and put it together successfully.

Alyn | April 4, 2018

Great power bus for a smaller system, quick to build.

I'm a new Eurorackist and am using this in a home-built 84HP Eurorack skiff. Fourteen Doepfer connections is probably overkill (edit in September: No, I've filled them all!), but I wanted the additional 1U-type connectors. I've not populated the Analogue Systems connections, as I don't have any modules requiring them. Only thing that would make this better is resettable fuses in the bus somewhere - there's no help if you start drawing more power than the board can handle. I'm doing both modules and cables DIY, so it _should't_ happen, but I'm still concerned.

Response from Electronic things... and stuff | Jan. 6, 2019

Hi Alyn!
Yes, the power connectors are filled pretty quickly in a modular system! There's never enough modules and never enough power connectors!

On the lack of resettable fuses, I totally understand your concerns.
The power bus board itself doesn't require a fuse. It can handle a lot of current and your PSU must have a fuse anyway. In case of a short circuit (several amps), it's the PSU fuse who blows.

A faulty module shouldn't damage the orther modules.
The only advantage of having fuses on the bus board is to separate the faulty circuit and to prevent the whole system to stop functionning.
However, it's complicated to design such protection: What's a faulty module? How much current a module is reasonably supposed to draw to stay safe?
For example, a VCO draws around a couple tens of miliamps while some big multifunction modules with LEDs and µC or a tube VCA draw hundreds of mA. Maybe more.
So, placing, say, a 200mA fuse on each connector would prevent some modules to function properly and maybe wouldn't be enough to prevent damaging a faulty module.

Besides, the worst thing a module can experience is having a reversed power input. (Wrong cable, misconntected connector, badly powered bus...)
The best way to keep everything safe is having some protection diodes or Mosfets on each module power input.

Kenneth | Aug. 22, 2017

Really great design, handy and excellent for fast builds

This Eurorack proto-board is perfectly sized for quick module builds and development. I have hand-built almost all of my modules (except for one -- couldn't live without a DSI Curtis Filter...) and this PCB is by far the quickest and most straightforward platform for building modules that I've encountered, the design is very good, with three rails accessible for op amps / etc, places for power-protection diodes and a keyed header, and the mounting holes are well positioned and well sized.

Shipping (I am in US) was quick and package arrived in good shape.

I use #6-32 screws for my builds and have to widen the holes slightly but there is more than adequate room around them with no copper so you can do this.

The layout is essentially similar to standard "breadboards" which makes transferring a breadboarded circuit to PCB very easy. This is a far better and more useful layout than even the classic Adafruit perma-proto boards.

What else is great? If you use through-hole pots, jacks etc this is absolutely PERFECT and you can create very slim builds. You can easily access and use the 5V power rail if that's your preference, and although there isn't a separate power bus for this I have not found it inconvenient.

I honestly plan to use these PCBs for any/all my future builds, even ones of higher complexity can simply utilize them stacked or side by side.

Response from Electronic things... and stuff | Aug. 22, 2017

Thank you so much Kenneth for your kind words! :D
David.

Tom | Feb. 2, 2017

Nice and straightforward power bus

I bought two of these PCBs to go in my synthesizer, and bought the parts separately to build them up.

All went together very smoothly. I'm not using the 5V converter - I've already got 5V coming from my power supply - so am just using them for power distribution, for which they work really well. I particularly like the tile-tail connectors for my 1U tile row. My only complaint would be that the tile tail connectors are a tad close - they're spaced as 0.1" pin headers, and they perhaps could be a bit wider. But they work, and I get a decent row of modules and tiles off a single PCB.

Shipping was swift and packaging very good indeed.

Paul | Dec. 17, 2016

Very versatile and useful for building eurorack modules.