Search found 481 matches

by Eloc
Mon Jul 27, 2020 2:46 pm
Forum: Music Tech DIY
Topic: Adding CV to existing things/mod Nebulophone into a eurorack module.
Replies: 6
Views: 236

Re: Adding CV to existing things/mod Nebulophone into a eurorack module.

In addition to the two diodes, you will need to at least use some resistors to passively sum the voltage from the pot and your CV together, or preferably use an op-amp to actively sum those two voltages together. If you just inject a voltage directly into the ATmega you could be shorting your CV dir...
by Eloc
Fri Jul 24, 2020 3:36 pm
Forum: Music Tech DIY
Topic: Reducing Depth of Strom Power Module
Replies: 7
Views: 242

Re: Reducing Depth of Strom Power Module

What depth is it, and what depth do you need it to be? And how handy are you with this type of thing? Also, do you care that you are going to void the warranty, and possibly affect resale value?
by Eloc
Fri Jul 24, 2020 3:22 pm
Forum: Music Tech DIY
Topic: CR-78 Metal Beat clone schematic
Replies: 5
Views: 392

Re: CR-78 Metal Beat clone schematic

Nice! Thanks for posting this.

Are there any resistors that could be suitably replaced by a pot to get some more variation of sound out of this? Perhaps something in the bandpass section? Oscillator freq control would obviously be simple enough
by Eloc
Fri Jul 24, 2020 3:04 pm
Forum: Music Tech DIY
Topic: Adding CV to existing things/mod Nebulophone into a eurorack module.
Replies: 6
Views: 236

Re: Adding CV to existing things/mod Nebulophone into a eurorack module.

Well, looking at the schematic, the three pots are used to send a voltage between 0-5V to the ATmega. So if you want to keep it simple you could send your CV to those same pins with some input protection (using a zener diode or a couple of 1N4148 diodes for example and a resistor) and then you would...
by Eloc
Thu Jul 16, 2020 12:35 pm
Forum: Music Tech DIY
Topic: No love for the Axoloti DSP Board?
Replies: 190
Views: 27082

Re: No love for the Axoloti DSP Board?

(edit) tele_player's comment above was posted whilst I was writing this I have a 'Euxoloti' PCB and Panel set that I never built up or got an axoloti for. Would one of these Aksos be compatible with that? I believe it's all open source, so that might be an option for people wanting a (large) panel f...
by Eloc
Sat Jul 11, 2020 11:06 am
Forum: Music Tech DIY
Topic: DIY aluminium case: yes or no?
Replies: 28
Views: 1458

Re: DIY aluminium case: yes or no?

Here's their whole range of these extrusions; 1U, 2U and Corner:

https://www.penn-elcom.com/default.asp? ... 0101&LG=EN
by Eloc
Sat Jul 11, 2020 8:07 am
Forum: Music Tech DIY
Topic: The 2020 Show Us Your DIY Builds Thread!
Replies: 519
Views: 45651

Re: The 2020 Show Us Your DIY Builds Thread!

@nigel Those all sound like really cool circuit designs. What circuit did you use to round the triangles off and also the clipping part. Is it diode based stuff? I see the two green LEDs in there. And I see the V/oct trim, it would be cool to have such a compact little 4 note chord/drone maker. Do t...
by Eloc
Sat Jul 11, 2020 7:55 am
Forum: Music Tech DIY
Topic: DIY aluminium case: yes or no?
Replies: 28
Views: 1458

Re: DIY aluminium case: yes or no?

This is a stomp box that I made (again unfinished, I tend to get sidetracked by new projects... :oops: ) from a Gieskes DEP2B (a strange little digital effects thingy), using some scrap aluminium sheet I had lying around, and the Penn Elcom 1U and Corner extrusions. So it's quite useful stuff... if ...
by Eloc
Sat Jul 11, 2020 7:41 am
Forum: Music Tech DIY
Topic: DIY aluminium case: yes or no?
Replies: 28
Views: 1458

Re: DIY aluminium case: yes or no?

Maybe they have been discontinued. But I bought around 8-10 of them between 2014-2016, the 86hp length (they also have corners too, like two of the rail sections joined at a right angle), and I got them from ebay I think because I couldn't find them in many places. I don't know if Penn Elcom had a w...
by Eloc
Fri Jul 10, 2020 2:49 pm
Forum: Music Tech DIY
Topic: DIY aluminium case: yes or no?
Replies: 28
Views: 1458

Re: DIY aluminium case: yes or no?

Not the best pics (excuse the dust!), and I haven't quite finished this particular case, but you get the gist:
P1013395-2.jpg
P1013393-2.jpg
I haven't got a vernier guage to hand so I can't give precise measurements, but it's approximately the following:
pennelcomextrusion3.png
by Eloc
Thu Jul 09, 2020 6:58 pm
Forum: Music Tech DIY
Topic: DIY aluminium case: yes or no?
Replies: 28
Views: 1458

Re: DIY aluminium case: yes or no?

The easiest cases I've made from aluminium, I used Penn Elcom 'Frame Extrusion'. It's basically an aluminium extrusion that makes the whole top and bottom wall of the case. Comes black anodised. It has a slot on both edges that M2.5 square nuts or M2.5 tapped strip can fit in (just like any typical ...
by Eloc
Thu Jul 09, 2020 2:36 pm
Forum: Music Tech DIY
Topic: DIY aluminium case: yes or no?
Replies: 28
Views: 1458

Re: DIY aluminium case: yes or no?

You can buy aluminium sheet with one side already anodized. It won't take well to bending sharp angles once it is anodized, but you would be better off designing the case in a way that bends aren't required, unless you have access to a professional press-brake. Ersatzplanet's cases above have no ben...
by Eloc
Mon Jul 06, 2020 10:04 am
Forum: Music Tech DIY
Topic: VCOs with Odd/Even/Fundamental outputs?
Replies: 11
Views: 476

Re: VCOs with Odd/Even/Fundamental outputs?

Thanks all @Trachea: The 'Even' waveform of the VCO you linked to is more complex than just the double frequency saw in the Joranalogue Gen 3. It's a double freq saw mixed with a sine (It's also the extra waveform that the Even VCO that Befaco produces). I'm guessing this is the same theory as the m...
by Eloc
Sun Jul 05, 2020 4:12 pm
Forum: Music Tech DIY
Topic: VCOs with Odd/Even/Fundamental outputs?
Replies: 11
Views: 476

Re: VCOs with Odd/Even/Fundamental outputs?

I think you're probably right regarding the triangle core. I like the look of that triangle to octave up saw you posted (didn't see it before as you posted it when I was typing up my previous reply) I might try and draw up a full VCO schematic and see where it goes I like the idea of anything that s...
by Eloc
Sun Jul 05, 2020 1:09 pm
Forum: Music Tech DIY
Topic: VCOs with Odd/Even/Fundamental outputs?
Replies: 11
Views: 476

Re: VCOs with Odd/Even/Fundamental outputs?

Ah yes, seems obvious now. If the Odd waveform plus a Sine = Square wave. Then a Square minus a Sine = Odd waveform... :doh: Thanks! I think if is was based on a Saw core oscillator (instead of the triangle core of the Joranalogue Generate 3) it might be easier to derive an octave down sine from tha...
by Eloc
Sun Jul 05, 2020 12:27 pm
Forum: Music Tech DIY
Topic: VCOs with Odd/Even/Fundamental outputs?
Replies: 11
Views: 476

VCOs with Odd/Even/Fundamental outputs?

Hi all, Are there any schematics/info/DIY options out there for VCOs that have output waveforms for Odd/Even/Fundamental waveforms that can then be mixed together in different quantities to produce the standard Square/Saw/Ramp etc etc. Like the 'Joranalogue Generate 3' as can be seen here https://yo...
by Eloc
Sun Jul 05, 2020 7:46 am
Forum: Music Tech DIY
Topic: Replacement for BC245C J-FET?
Replies: 3
Views: 245

Re: Replacement for BC245C J-FET?

Ok, thanks. I'll have a browse through the datasheet. I imagine VGS and RDS are things to check for this application?
by Eloc
Sat Jul 04, 2020 10:43 am
Forum: Music Tech DIY
Topic: MP3 trigger and LMNC Big Button problem
Replies: 11
Views: 409

Re: MP3 trigger and LMNC Big Button problem

If I were you, I would try to test things individually to identify where the problem is. I would disconnect the sequencer from the MP3 Trigger device. I would connect a simple toggle switch to one of the MP3 triggers inputs and connect this to a confirmed 3.3V source on one side of the switch and gr...
by Eloc
Sat Jul 04, 2020 5:04 am
Forum: Music Tech DIY
Topic: Replacement for BC245C J-FET?
Replies: 3
Views: 245

Replacement for BC245C J-FET?

Hi, Does anyone know of a suitable equivalent J-FET that's relatively commonly available/still manufactured to replace BC245 C . I'm using it as a 'variable resistor' in a filter design. Doesn't need to be a pin-for-pin drop in, just roughly the same specs where it counts. I'm not entirely up on my ...
by Eloc
Mon Jun 29, 2020 8:10 pm
Forum: Music Tech DIY
Topic: Problem with Crush delay v3
Replies: 1
Views: 104

Re: Problem with Crush delay v3

Sounds perhaps like one or more of the 'circuit bending' type sections is permanently on, i.e. the three switches. Have you tried all of the switches to make sure they switch the individual effects on/off. From memory, some of those switches make the noisiness come in much earlier.
by Eloc
Sun Jun 28, 2020 9:11 pm
Forum: Music Tech DIY
Topic: Broken leg on IC Socket
Replies: 24
Views: 1028

Re: Broken leg on IC Socket

Do you have a spare IC socket? and is the pin of the broken metal part soldered into the board?
by Eloc
Sat Jun 27, 2020 6:08 pm
Forum: Music Tech DIY
Topic: Simple gate circuit?
Replies: 6
Views: 329

Re: Simple gate circuit?

Do you just want to pass gates/triggers through it? If so it should be quite simple. If you want to pass audio and have the pushbutton gates/triggers too, then it might be a little more complex. (Well there are simple ways for both, but audio requires a bit more if you want to do it nicely)
by Eloc
Thu Jun 25, 2020 1:24 pm
Forum: Music Tech DIY
Topic: DIY Trade Thread [ Parts, PCBs, Panels ]
Replies: 873
Views: 154188

Re: Re:

nrrrd wrote:
Thu Jun 25, 2020 1:19 pm
...Like paper circuits that have been made into pcbs...
I'm sure I saw someone selling some of these recently, maybe on the for sale section

edit: viewtopic.php?f=74&t=232911
by Eloc
Wed Jun 24, 2020 9:06 am
Forum: Music Tech DIY
Topic: AIRTOUCHS a DIY capacitive programable keyboard
Replies: 24
Views: 912

Re: AIRTOUCHS a DIY capacitive programable keyboard

Thanks for agreeing Pendejo 3000...
by Eloc
Wed Jun 24, 2020 8:51 am
Forum: Music Tech DIY
Topic: AIRTOUCHS a DIY capacitive programable keyboard
Replies: 24
Views: 912

Re: AIRTOUCHS a DIY capacitive programable keyboard

I think you should embrace spanish words (I'm assuming that's your first language?) Lots of spanish words sound immediately like product names to an english speaker's ear. Most of our 'technical' words are from latin, so spanish words kind of 'ring a bell' without even necessarily knowing the actual...

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