Search found 476 matches

by fitzgreyve
Thu Mar 26, 2020 10:12 am
Forum: Music Tech DIY
Topic: Too stupid to get ASM file into PIC with MPLAB X (Win7)
Replies: 2
Views: 63

Re: Too stupid to get ASM file into PIC with MPLAB X (Win7)

MPLAB-X is not as easy to use as earlier versions. It is trying to be more professional by wanting to assign everything to a "project". I assume you already found how to import a hex or "prebuilt" file: screen1.jpg To set up a project (sorry, english version): Select menu "file/new project" (this st...
by fitzgreyve
Sun Mar 15, 2020 11:00 am
Forum: Music Tech DIY
Topic: [IC] General Midi (GM) euro module - any interest?
Replies: 8
Views: 239

Re: [IC] General Midi (GM) euro module - any interest?

No, this is just midi to audio, no cv or gate.

Expert sleepers "General CV" module probably uses the same core DSP IC with CV/gate in - more faciltiies, but not DIY.
by fitzgreyve
Sun Mar 15, 2020 6:32 am
Forum: Music Tech DIY
Topic: [IC] General Midi (GM) euro module - any interest?
Replies: 8
Views: 239

[IC] General Midi (GM) euro module - any interest?

I'm in the early stages of designing a euro general midi module using the SAM2695 datasheet Ideally I'd go for a yamaha DB50XG, but the are long out of print (so expensive), too big (in euro terms), and consume significant power. problem with the SAM2695 for DIY is that it's a QFN44 package - proble...
by fitzgreyve
Sun Mar 15, 2020 5:38 am
Forum: Music Tech DIY
Topic: [Order] Roland 100M VCO PCBs/panels aka System X Oscillator
Replies: 175
Views: 23303

Re: [Order] Roland 100M VCO PCBs/panels aka System X Oscillator

Electric Druid have them listed at GBP 6.75 https://electricdruid.net/shop/ but currently out of stock. also: https://www.banzaimusic.com/CA3046.html at EUR 7.14 https://www.musikding.de/CA3046 at EUR 3.50 but no stock Lots much cheaper on ebay, but you take your chances. THere's also the (cheaper i...
by fitzgreyve
Sat Mar 14, 2020 10:57 am
Forum: Music Tech DIY
Topic: [Order] Roland 100M VCO PCBs/panels aka System X Oscillator
Replies: 175
Views: 23303

Re: [Order] Roland 100M VCO PCBs/panels aka System X Oscillator

Can't see anything obvious from the pics (haven't gone as far as checking values!). the lack of any output at all suggests that the sawtooth core (first page of schematic) isn't oscillating, I would get this working first and worry about triangle and pulse after. I'm assuming resistor values etc. ha...
by fitzgreyve
Fri Mar 13, 2020 1:53 pm
Forum: Music Tech DIY
Topic: [Order] Roland 100M VCO PCBs/panels aka System X Oscillator
Replies: 175
Views: 23303

Re: [Order] Roland 100M VCO PCBs/panels aka System X Oscillator

Gamma Phonic wrote:
Fri Mar 13, 2020 10:04 am
Any thoughts on how to proceed would be welcome.
Post decent pictures (PCB top, bottom, wiring) and we'll see if anyone can spot anything (if this has the plug-in "heater" PCB, probably best to remove it and photo separately).
by fitzgreyve
Sat Feb 22, 2020 5:37 am
Forum: Eurorack Modules
Topic: Achieving simple quarter tones in Eurorack
Replies: 18
Views: 516

Re: Achieving simple quarter tones in Eurorack

Just to be clear - it should work OK only using the CV2 inputs on the VCOs in your rack, but is sensitive to accurate setup, and then not being moved. THere are buffered attenuator modules available (possibly not by Doepfer?) , but IMO they won't give any significant advantage over the VCO CV2 input...
by fitzgreyve
Sat Feb 22, 2020 5:25 am
Forum: Eurorack Modules
Topic: Achieving simple quarter tones in Eurorack
Replies: 18
Views: 516

Re: Achieving simple quarter tones in Eurorack

The way 1V/oct works, attenuating by 50% would squash two octaves' worth of 12-tone quantized voltages into one octave's worth of 24-tone quantized voltages. So, in principle, it would work. In practice, a passive attenuator would not be precise enough for your purposes, I'm afraid. Was about to sa...
by fitzgreyve
Thu Feb 20, 2020 4:11 am
Forum: Eurorack Modules
Topic: LED patch cables? JackLights?
Replies: 34
Views: 1790

Re: LED patch cables? JackLights?

As an expeirment, I recently tried to convert a cheap chinese iluminated USB cable into a patch cable. These have two pairs of conductors with an optical fibre running between them, and a LED in one of the USB plugs. Unfortunately, you need to drive a pretty high current through the LED to get the c...
by fitzgreyve
Mon Feb 17, 2020 4:25 am
Forum: Music Tech DIY
Topic: MN3011 BBD Reverb Help
Replies: 4
Views: 354

Re: MN3011 BBD Reverb Help

I have an original digisound reverb pcb mounted in eurorack and running fine off the 12V supply without any modification, so that should not be an issue. Both the mn3101 and the mn3011 are designed to work off a negative supply: if "GND" is 0v, the "Vdd" supply must be -12v (negative). However, the ...
by fitzgreyve
Fri Feb 14, 2020 9:16 am
Forum: Music Tech DIY
Topic: Adding S-trig gate to Yarns/marbles
Replies: 2
Views: 178

Re: Adding S-trig gate to Yarns/marbles

As this is for yarns/marbles, I assume you mean an s-trig output . In it's simplest form, that just needs a resistor and a general purpose NPN transistor (e.g. BC547) for each s-trig output. Resistor 10k, 47k or so. Existing (V-trig) gate in on left, s-trig output on right. It's just about possible ...
by fitzgreyve
Fri Feb 14, 2020 6:52 am
Forum: Music Tech DIY
Topic: 16 Pin Header Projects
Replies: 5
Views: 264

Re: 16 Pin Header Projects

I tend to use the 16pin connector for any module that needs a gate input, and/or where there's a "dedicated" 1V/Oct input (mainly VCOs). The doepfer bus signal goes to the break contact on panel jacks so can always by overridden. For those modules with a 10 pin connector, I've got adaptor PCBs avail...
by fitzgreyve
Tue Feb 04, 2020 9:54 am
Forum: Music Tech DIY
Topic: Fitzgreyve Transient and dAhDShR upgrades
Replies: 2
Views: 141

Re: Fitzgreyve Transient and dAhDShR upgrades

I've not used .ASM files before. Is it just like programming an Atmega, or STM32 or Teensy etc? atemga or stm32 - more or less (not as easy as a teesny or ardiuno etc), assuming you have a pic programmer. Can also supply hex files (which doesn't give any significant advantage over .asm), or program...
by fitzgreyve
Tue Feb 04, 2020 4:01 am
Forum: Music Tech DIY
Topic: Calibrating Mutable Instruments Elements CV attenuverters?
Replies: 3
Views: 177

Re: Calibrating Mutable Instruments Elements CV attenuverters?

Is it possible that log pots have been used for the build instead of linear ? As far as I'm aware there is no calibration procedure for individual controls (currently got Elements on the workbench).
by fitzgreyve
Mon Feb 03, 2020 7:19 am
Forum: Music Tech DIY
Topic: Fitzgreyve Transient and dAhDShR upgrades
Replies: 2
Views: 141

Fitzgreyve Transient and dAhDShR upgrades

Software upgrades are now available for the Fitzgreyve Transient and dAhDShR modules - see attachments. These expand the standard control range ( of up to 10 seconds ) to add selectable control ranges of up to 100 seconds, 1000 seconds, or 2440 seconds (thats around 42 minutes!) Transient thread: ht...
by fitzgreyve
Thu Jan 30, 2020 4:19 am
Forum: Music Tech DIY
Topic: Power Switches on Modules
Replies: 7
Views: 475

Re: Power Switches on Modules

I only have one module with a (partial) power switch - it controls a valve heater which draws approx 400mA, so tend to leave it powered off when not in use (also gives some nice effects when the heater is powered up and down)
by fitzgreyve
Thu Jan 30, 2020 4:14 am
Forum: Modular Synth General Discussion
Topic: Triadex "The Muse" pics and sound clips.
Replies: 95
Views: 14319

Re:

the 5 bit dac, as well as how it implemented the "major scale translation". It's actually a 4 bit DAC - the lower three bits (interval A,B,C) select the note of a major scale, if the the high bit (interval D) is active it shifts this up by one octave. (Ref: Muse manual "how to make muse music", P.1...
by fitzgreyve
Thu Jan 30, 2020 4:07 am
Forum: Modular Synth General Discussion
Topic: Triadex "The Muse" pics and sound clips.
Replies: 95
Views: 14319

Re: Re:

Wow, looks amazing! Thanks for the update on the progress. Porting, no, not always a favorite activity .... Still working on this, approximately 95% complete. My current issue is getting configuration setting storage working (the PIC I selected uses High Endurance Flash, previously I've been used t...
by fitzgreyve
Thu Jan 09, 2020 12:23 pm
Forum: Music Tech DIY
Topic: Best "analog" way to CV address seq steps
Replies: 31
Views: 1144

Re: Best "analog" way to CV address seq steps

8 bit ADC set to free running conversion - in the past I've used ADC0804 or ZN427E-8, there has to be an up to date equivelent. CV input scaling and offset to the ADC input as required. then, Top 3 ADC output bits into a 3-8 line decoder - analog switch such as CD4051 with the common input tied to l...
by fitzgreyve
Wed Jan 08, 2020 9:13 am
Forum: Music Tech DIY
Topic: CD4006 based simplest digital noise source
Replies: 48
Views: 5000

Re: CD4006 based simplest digital noise source

Electric Druid has a nice analysis of the TR909 circuit here:

https://electricdruid.net/tr-909-noise-generator/

(plus several PIC based noise generators on the site)
by fitzgreyve
Wed Jan 08, 2020 4:04 am
Forum: Music Tech DIY
Topic: Soldering a crystal, ideas ?
Replies: 14
Views: 651

Re: Soldering a crystal, ideas ?

As long as there are no exposed tracks or vias etc on the PCB suraface below the xtal, I've always just soldered flat to the PCB - no insulator or spacer.

Never had any problem.
by fitzgreyve
Sun Dec 15, 2019 6:14 am
Forum: Music Tech DIY
Topic: How do you delay an LFO?
Replies: 5
Views: 703

see schematic here:

100m-ish LFO

You want the circuit around Q1 going in to pin 10 of the PIC (the level control input).

This is the same circuit as the 100m uses, but adapted to PIC voltage levels (i.e. +5V supply)
by fitzgreyve
Tue Dec 03, 2019 3:52 am
Forum: Music Tech DIY
Topic: DIY Stereo Mixer?
Replies: 6
Views: 520

by fitzgreyve
Fri Nov 29, 2019 4:21 am
Forum: Music Tech DIY
Topic: fs: Euro blanks in odd sizes (in both black and silver!)
Replies: 2
Views: 284

Just received a mixed selection of these : nice basic blank panels - do the job, no fuss.
by fitzgreyve
Sat Nov 09, 2019 7:21 am
Forum: Music Tech DIY
Topic: 100m-ish Audio Delay with V3205SD - step by step (5 to 8V)
Replies: 4
Views: 430

One thing to be fixed, I think, is that output level is too low (but it is for V3205 and MN3007 also) and may be amplified a little. I've used the Roland values (for the MN30xx based circuit). With 10V p-p input, I'm getting about 15V p-p output. The output level is determined by R31 - increase it ...

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