Search found 70 matches

by welhamc
Mon Mar 02, 2020 5:16 pm
Forum: Oakley Sound Systems
Topic: Euro PSU
Replies: 5
Views: 273

Re: Euro PSU

All working now! The problem was D13... it must've been fried when the LM337 was shorted but replacing it has given me -12v on the negative rail at last
by welhamc
Mon Mar 02, 2020 5:08 pm
Forum: Oakley Sound Systems
Topic: Euro PSU
Replies: 5
Views: 273

Re: Euro PSU

The voltage on pin 1 of u3 is around -24v whereas on pin 1 of the LM317 its is +11v - it seems that the problem is further upstream than the lm337 but cannot find anything obvious on the board..
by welhamc
Mon Mar 02, 2020 4:27 pm
Forum: Oakley Sound Systems
Topic: Euro PSU
Replies: 5
Views: 273

Re: Euro PSU

No luck swapping out for a new LM337. I also swapped out D11, the NEG trimmer and R7 and R9 and checked all the diodes - still getting around -23v on the -12v rail

I have an LM337BT instead of an LM337T - is this an issue?
by welhamc
Sun Mar 01, 2020 12:57 pm
Forum: Music Tech DIY
Topic: Is this fixable? First build, turing machine, overheated elements
Replies: 15
Views: 389

Re: Is this fixable? First build, turing machine, overheated elements

This is the solder I use, its a British seller on eBay but sends to EU https://www.ebay.de/itm/EXPO-77598-REEL-OF-HIGH-QUALITY-110-GRAM-LOCTITE-MULTICORE-LEADED-SOLDER/222265194619?epid=1354628864&hash=item33c009b87b:g:3ugAAOSwqu9U5ODs Soldering at higher temperatures runs the risk of pulling pads o...
by welhamc
Sun Mar 01, 2020 9:21 am
Forum: Music Tech DIY
Topic: Is this fixable? First build, turing machine, overheated elements
Replies: 15
Views: 389

Re: Is this fixable? First build, turing machine, overheated elements

Also make sure to clean off all the flux residue after you have finished soldering - it can become potentially corrosive over time

I use some 99% isopropyl alcohol and a stiff brush
by welhamc
Sun Mar 01, 2020 9:15 am
Forum: Music Tech DIY
Topic: Is this fixable? First build, turing machine, overheated elements
Replies: 15
Views: 389

Re: Is this fixable? First build, turing machine, overheated elements

Also as another point, I would always recommend leaded solder - thats just my preference but it flows a lot better in general
by welhamc
Sun Mar 01, 2020 9:12 am
Forum: Music Tech DIY
Topic: Is this fixable? First build, turing machine, overheated elements
Replies: 15
Views: 389

Re: Is this fixable? First build, turing machine, overheated elements

You may have had troubles due to the ground plane (the expansive area of copper on the board). Copper is obviously electrically conductive, but is also a good conductor of heat. If you are heating up a component lug that is coupled to the ground plane you are essentially heating up the entire large ...
by welhamc
Sat Feb 29, 2020 7:37 pm
Forum: Music Tech DIY
Topic: Is this fixable? First build, turing machine, overheated elements
Replies: 15
Views: 389

Re: Is this fixable? First build, turing machine, overheated elements

It looks salvageable - you could solder the left hand side to the component lug above it (follow the trace), the right hand side can be soldered to anywhere around the hole as it looks like a ground plane - you could just scrape back and solder If you're a beginner it may be better to just order ano...
by welhamc
Fri Feb 28, 2020 4:29 pm
Forum: Oakley Sound Systems
Topic: Euro PSU
Replies: 5
Views: 273

Euro PSU

I'm having an issue with a build of a eurorack PSU. The +12v and +5v rails are all working as expected, but the -12v rail is reading as -24v. I have checked that all the components are correct (including R7 and R9) and there are no dry solder joints. When I first powered the module there was a short...
by welhamc
Tue Feb 18, 2020 12:19 pm
Forum: Production Techniques
Topic: Phaedra synthesis
Replies: 11
Views: 537

Re: Phaedra synthesis

Are you talking about this? http://randomsource.net/haible/krautrock

I'm tempted to build one in 5u...
by welhamc
Tue Feb 18, 2020 11:43 am
Forum: Production Techniques
Topic: Phaedra synthesis
Replies: 11
Views: 537

Re: Phaedra synthesis

Ah thanks for that - I'm guessing it would be best to get some strings samples into my Akai sampler then and go from there. I probably could not afford a mellotron...

In terms of trying to recreate some of these mellotron sounds with synthesis, where would be a good place to start?
by welhamc
Mon Feb 17, 2020 7:12 pm
Forum: Music Tech DIY
Topic: DIY builders for hire
Replies: 283
Views: 52525

Re: DIY builders for hire

I'm located in Bristol, UK. I am happy to offer a range of DIY services including module building (5U/MOTM/Eurorack/4u), power supply building and some repair services. If you have anything to ask please PM me!
by welhamc
Mon Feb 17, 2020 8:29 am
Forum: Production Techniques
Topic: Phaedra synthesis
Replies: 11
Views: 537

Phaedra synthesis

I have recently discovered TD (I know) and have been thoroughly rinsing through their discography over the last few weeks One of the sounds that keeps coming back to me is the early lead in Phaedra (https://www.youtube.com/watch?v=URssLwPXkVk, around 3:40 in) and was thinking about the process in th...
by welhamc
Sat Feb 08, 2020 10:49 am
Forum: Music Tech DIY
Topic: Akai ME30pii input dead
Replies: 0
Views: 290

Akai ME30pii input dead

Hi muff, wondering if anyone can help me One of the inputs on my Akai ME30pii midi patchbay doesn't seem to be working recently Its not a connector issue as I have opened up the unit and continuity tested the inputs. There does seem to be quite a suspect burnt-out electronics smell though. I have in...
by welhamc
Thu Feb 06, 2020 10:06 am
Forum: Modular Synth General Discussion
Topic: Starter Setup ?
Replies: 51
Views: 1717

Re: Starter Setup ?

If you ever need someone to build you a DIY module feel free to PM me :)
by welhamc
Sat Feb 01, 2020 7:38 am
Forum: Oakley Sound Systems
Topic: PSU Resistor
Replies: 1
Views: 150

PSU Resistor

Hi everyone

I am currently building am Oakley PSU2

However, I have just noticed I do not have any 240r resistors for R2 and R3... I have 220r though, will these be a sufficient sub?

Chris
by welhamc
Sat Feb 01, 2020 7:16 am
Forum: Music Tech DIY
Topic: PSU Grounding
Replies: 1
Views: 243

PSU Grounding

Hi muff I have a question about grounding for a PSU I'm building. As my access to metal working tools is pretty limited, I decided to use a 1u panel with a punched out IEC slot as my input which then connects to a 4u panel containing the PSU, transformer etc. The IEC panel is coupled to the main pan...
by welhamc
Sat Feb 01, 2020 6:31 am
Forum: 5U Format Modules
Topic: Poly CV control
Replies: 16
Views: 764

Re: Poly CV control

Thanks everyone! I think I'm most tempted by a DIY yarns in a small euro rack

What would be your must have euro modules to accompany an MOTM set up? (ie to fill a small row)
by welhamc
Thu Jan 30, 2020 7:09 pm
Forum: 5U Format Modules
Topic: Poly CV control
Replies: 16
Views: 764

Poly CV control

Evening muff One of the projects I've always dreamed of undertaking is a polyphonic modular set up. I understand what is required in terms of voice modules (ie an osc, ADSR, VCA and ideally filter per voice), and I am not far off having suitable modules for a four voice MOTM system. However I am sti...
by welhamc
Thu Jan 30, 2020 6:24 pm
Forum: 5U Format Modules
Topic: MOTM rack rail end caps
Replies: 90
Views: 6183

Re: MOTM rack rail end caps

any of these left Tony?
by welhamc
Sun Jan 26, 2020 9:29 am
Forum: Oakley Sound Systems
Topic: R9 Oakley VCO
Replies: 2
Views: 209

Re: R9 Oakley VCO

Thanks for the reply Tony. From how you've described it to me, I agree with you in that it makes most sense for 5V (middle value) to equate to C4 (middle key) on the keyboard, so have gone for a 180K resistor I'm not too fussed about having to retune oscillators on a patch by patch basis to account ...
by welhamc
Sun Jan 26, 2020 9:25 am
Forum: Music Tech DIY
Topic: x0xb0x
Replies: 10
Views: 449

Re: x0xb0x

Thanks for the replies everyone, I don't have access to autocad unfortunately so may struggle to open the DXF files I am more than happy to layout my own panel in 5u, but as the components are PCB mounted I'll need to get access to those DXF files somehow so that I can layout everything to match the...
by welhamc
Sun Jan 26, 2020 9:18 am
Forum: Music Tech DIY
Topic: Front Panel Proof Reading Thread
Replies: 462
Views: 76531

Re: Front Panel Proof Reading Thread

This is without component overlays
by welhamc
Sun Jan 26, 2020 9:13 am
Forum: Music Tech DIY
Topic: Front Panel Proof Reading Thread
Replies: 462
Views: 76531

Re: Front Panel Proof Reading Thread

I've attached a screenshot of my design of the MFOS rotary sequencer, with the addition of the vari-step board in 5u I have made overlays for each of the components, so just posting to see if theres anything blaringly obvious/stupid that I'm missing. The panel is going to cost around £120 from FPD s...
by welhamc
Sat Jan 25, 2020 3:31 pm
Forum: Music Tech DIY
Topic: x0xb0x
Replies: 10
Views: 449

x0xb0x

I'm potentially planning on building a x0xb0x at some point in the near future but as theres no kits online anymore I was wondering if anyone had an FPD file for the panels? I'm a big fan of thebeast's port of the x0xb0x to 5u, but unsure whether these files are in the public domain Additionally doe...

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