PIC based Arpeggiator (Boards available)

[emdot_ambient]

Agreed, nice build (and resistor values greatly anticipated!).

[Skrog Productions]

Thanks for the encouragement guys .

Here are the resistor choices i made , which work great for my build , you may need to adjust them if it doesn't work on your builds.
They all total 100K just like the control pots in the suggestion diagrams in the build PDF.

Remember , you may want just the Rate (Tempo) pot which doubles as the divider control when you plug a jack into the ext clock 3-pole socket , i finished my panel before i read this , when i want internal clock tempo i use the rate pot , when i want external clock division i flick a switch to use the rotary instead of the rate pot.

Good luck with your designs looking forward to seeing them.

Dave.

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cv Arpeggiator rotary resistors SkrogProductions.JPG
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[Skrog Productions]

here are some sounds using the arpeggiator with my modular.

first mp3 is the arp with keyboard cv to transpose while i turn the rotary switches.

Second mp3 is my mfos 16 step sequencer cv controlling the note sets while being clocked 8 times slower than the arpeggiator speed ( all clocked from Fonik Clock ) .

The arp cv & Gate outs are patched up to a simple 2 vco monosynth config. on the modular.

Dave.

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arpeggiator test 1.mp3
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seq to note set cv arpeggiator test.mp3
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[brother303]

Hi Dave,

[LektroiD]

I've just built this Arpeggiator as "the works" (example 3), but the build docs don't actually indicate what each control or socket does, only where to wire it to the PCB. (I'd really like to see round the front of the example to see what's going on)...

I'm just plugging stuff in and out but not really knowing what is going on with it since nothing is labelled properly.. the socket connected to XCLK and CKEN (I'm presuming it is a clock of some description), is that an in or an out? I connected it to an external clock and it does some weird rhythms, like it is taking the rhythm from both internal and external at the same time, is this normal?

There's also 3 CV in sockets and 4 controls connected to various CV connections on the board. Turning the dials has different effects for each, but I have no idea what they are really doing.

Also, the 3rd & 7th sockets, are these outputs? Do I need to connect these and the main CV out to a CV mixer to make them work?

If anyone knows what the labelling should be on "the works" (3rd example in build docs), please let me know, I'm scratching my head here.

[Skrog Productions]

Hi Rich , how are you .

The 3rd & 7ths sockets are inputs , i think it's a sort of digital input to switch between Major and minor , high / low switching.

The control dials.... have a look at my rotary diagram up above , they represent a flattened out pot track , the resistor joins are roughly where the range / movement / note set would change function if you are using pots only turning the dial .


The internal clock for stand alone mode is wired to a stereo panel jack wired up for internal clock (no jack plugged in) or external clock (jack in & disabling internal clock , when that is done the internal rate pot now acts as a variable divider for the external clock pulse .

I remember i had a bit of head scratching planning this one out , but its great once you understand it , it really thickens out my sequency music i do , great pcb & pic

Dave

[ericcoleridge]

[LektroiD]

[LektroiD]

Hmmm, just a quick one, the pot attached to CV1 which seems to control Pulse Width also changes the pitch by a semitone or more... Is that a feature or a bug?

Also, what is AUX IN? Auxiliary what? CV? Audio?... I put a voltage in from an LFO and wound up the dial, it shut down...

[aladan]

I built my BMC-003 last night (first of two) and here is my experience.

* Spend time reading the build doc and understanding it before you start *

You need to understand this module before you build it. It is quite customisable, with some unconnected 'building blocks' (AUX, CVIN1, CVIN2) and numerous panel options that you can mold to your personal needs/wants. But if you just jump in without reading the docs, you will most likely get confused.

Pros: it works as described, is fun to use and is quite flexible in design. The board quality is good, double-sided, and the integrated +5V supply circuitry is a handy feature. Mine worked first time (once I corrected the power supply pins which I had wired backwards the first time round - doh!)

Cons: Please note that these are very minor criticisms! The renumbering of the PIC pins in the middle of the instructions (to cater for the 8+14 pin socket hack) can be a little confusing. The resistor pads are pretty close together - I had to bend the resistor pins quite close to the ends.

I am running on a 4MHz crystal because I didn't have a 20MHz handy.

Summary: great module, flexible but read the instructions thoroughly first!

Thank you Michael!

[baudrate]

Does anyone know if these boards (well any Barton PCB's) are still available? I've been trying to get in touch with Michael for about 6 weeks now with no luck. I know a few people on Muffwigglers are in the same boat.

[haxster]

I really hope he is okay, I will try to email him too. I was buying large packs of Arp CV pics from him.