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LektroiD
Joined: Aug 23, 2008 Posts: 1018 Location: Scottish Borders
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Posted: Sat May 21, 2011 4:19 am Post subject:
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what are the Schottky diodes (no part number listed in the BOM)? I have a pile of rectifier diodes here; BYD11D, 200V. Would they work? _________________ LektroiD |
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blue hell
Site Admin
Joined: Apr 03, 2004 Posts: 24075 Location: The Netherlands, Enschede
Audio files: 277
G2 patch files: 320
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Posted: Sat May 21, 2011 4:31 am Post subject:
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from the BOM:
Quote: | Schottky Diode (SD101C was used in prototypes, but it's not critical) |
BYD11D is not a Schottky diode; BAT85 used to be a commonly used schottky. _________________ Jan
also .. could someone please turn down the thermostat a bit.
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LektroiD
Joined: Aug 23, 2008 Posts: 1018 Location: Scottish Borders
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G2 patch files: 2
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Posted: Sat May 21, 2011 8:13 am Post subject:
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Cool, I'll replace those with the BAT85's then..
Also, can I use 22pf in place of the 18pf (and save myself a trip to the dreaded Maplin)? _________________ LektroiD |
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Boogdish
Joined: Sep 21, 2009 Posts: 122 Location: Bloomington, IN
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Posted: Sat May 21, 2011 9:17 am Post subject:
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22pf should be fine.
The datasheet for your crystal oscillator will indicate the ideal load capacitor, but being a few picofarads off shouldn't make a noticeable difference. |
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Skrog Productions
Joined: Jan 07, 2009 Posts: 1196 Location: Scottish Borders
Audio files: 155
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Posted: Mon May 23, 2011 10:57 am Post subject:
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Got mine today !!!
Thanks again.
Maplin....he he he he , esp. the saturday till kids ...(...ferrite beads please, no , it's not a s£x toy , it's an electronic choke).... ha ha ha
Dave |
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LektroiD
Joined: Aug 23, 2008 Posts: 1018 Location: Scottish Borders
Audio files: 2
G2 patch files: 2
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Posted: Mon May 23, 2011 4:47 pm Post subject:
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Skrog Productions wrote: | Maplin....he he he he , esp. the saturday till kids ...(...ferrite beads please, no , it's not a s£x toy , it's an electronic choke).... ha ha ha
Dave |
Last time I was in for a 50k potentiometer, the Saturday guy looked at me like I was from another planet, then proceeded to be rude and offensive, shoving the catalogue in my face telling me he needs the maplin codes (like I'm supposed to know this). If I wasn't such a placid guy, I'd have probably punched him out there and then. Instead, I called the shop and made the manager aware of this guy's obnoxious behaviour.
Anyway, I got some 18pf caps in the end from Farnell. _________________ LektroiD |
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Skrog Productions
Joined: Jan 07, 2009 Posts: 1196 Location: Scottish Borders
Audio files: 155
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Posted: Mon May 30, 2011 12:37 pm Post subject:
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I'm busy doodling with pencil & paper , a Panel layout for the Arpeg. before i start building, i wondered about having rotary switches to select movement & range , would i just make a daughter board to mount voltage divider resistors for each switch pole ?.
Dave. |
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Boogdish
Joined: Sep 21, 2009 Posts: 122 Location: Bloomington, IN
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Posted: Mon May 30, 2011 7:52 pm Post subject:
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I would mount resistors directly on the switch. Connect ground to the lug for the furthest clockwise position and resistor going from that lug to the next, then on the next lug attach another resistor going to the next lug and so forth until you get to the most clockwise position which would be tied to +5V.
I'd only use a daughterboard for this if I was using a PC mounted pot. Otherwise you're not only soldering all those resistors but also jumpers from the board to the switch and you're making more work for yourself. |
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JoeMorris
Joined: Apr 26, 2009 Posts: 161 Location: Brighton
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Posted: Tue May 31, 2011 1:11 pm Post subject:
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Got mine, thanks looks great! |
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JoeMorris
Joined: Apr 26, 2009 Posts: 161 Location: Brighton
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Posted: Tue May 31, 2011 1:14 pm Post subject:
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Quick Q that might be slightly off topic, but would be interested to now if this is possible - if I set up my MPC 3000 to output a sample of a loud, short transient pulse on one of its individual outputs, could I use this as a clock signal to control the speed of my arpeggiator's modular arpeggio, swinging wth its quantised groove? That would be really cool. |
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Peake
Joined: Jun 29, 2007 Posts: 1113 Location: Loss Angeles
Audio files: 3
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Posted: Tue May 31, 2011 2:18 pm Post subject:
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If the MPC's outputs are DC-coupled (not filtered by a cap to remove DC).
There are other important aspects but that would be the single most important thing to discover. If you cannot remove any DC-blocking capacitors, you can use an envelope follower/Schmitt trigger to turn the audio pulse into a DC pulse suitable for triggering/advancing clocks. _________________ We are selling emotions, there are no emotions in a grid. -mwagener
"IC 741. Sometimes you don't want fidelity." -Small Bear Electronics Catalog |
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JoeMorris
Joined: Apr 26, 2009 Posts: 161 Location: Brighton
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Posted: Tue May 31, 2011 2:27 pm Post subject:
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yes, good point, i have an oakley EFG and that also has a gate output anyway, so there's always that option... just wondering in my uninformed way whether a sample of a short trigger pulse could work as a trigger generally in modulars, i.e. using individual outs of my mpc to trigger diy drum modules etc.. I realise a gate signal will probably be filtered out but a short transient should get through as AC shouldnt it? Will the arpeggiator clock not be moved on a tick by a trigger signal like this then, it requires a pulse that's longer than that? Excuse the rookie questions. |
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rosch
Joined: Oct 03, 2009 Posts: 164 Location: germany
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Posted: Tue May 31, 2011 2:33 pm Post subject:
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you can try it. i've been triggering all drum modules with e.g. a snare from the S1000 and it always worked fine with the ones i had.
they probably had the necessary circuitry. it even worked with velocities.
the drums were for example sonor mini mammut, pearl syncussion, boss drp, formanta, simmons, dynacord, actually everything that had a trigger in (for pads/microphones) |
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Boogdish
Joined: Sep 21, 2009 Posts: 122 Location: Bloomington, IN
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Posted: Tue May 31, 2011 5:07 pm Post subject:
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This needs a a +5V DC pulse to trigger it. I pulled out my SR-16 just to make sure and I couldn't get any response from plugging it's output to either of the trigger inputs.
You'd need to run the audio into an envelope follower like Peake said. |
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JoeMorris
Joined: Apr 26, 2009 Posts: 161 Location: Brighton
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Posted: Wed Jun 01, 2011 1:08 am Post subject:
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cool, thanks for the test/clarification, I guess i can still get down the envelope following route then for tight as you like mpc arpeggiator swing! |
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wmonk
Joined: Sep 15, 2008 Posts: 528 Location: Enschede, the Netherlands
Audio files: 15
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JoeMorris
Joined: Apr 26, 2009 Posts: 161 Location: Brighton
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Posted: Wed Jun 01, 2011 7:01 am Post subject:
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hmm looks good, would the 10ms pulse width be enough to trigger the pic arpeggiator clock i wonder? |
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Boogdish
Joined: Sep 21, 2009 Posts: 122 Location: Bloomington, IN
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Posted: Sat Jun 04, 2011 12:14 pm Post subject:
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10ms is plenty. |
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JoeMorris
Joined: Apr 26, 2009 Posts: 161 Location: Brighton
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Posted: Sun Jun 05, 2011 3:10 am Post subject:
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great thanks, looking forward to this big time. |
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Boogdish
Joined: Sep 21, 2009 Posts: 122 Location: Bloomington, IN
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Posted: Sat Jun 11, 2011 3:39 pm Post subject:
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New boards are in for this, with a pad for an MOTM style power connecter and ferrite beads. |
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Skrog Productions
Joined: Jan 07, 2009 Posts: 1196 Location: Scottish Borders
Audio files: 155
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ericcoleridge
Joined: Jan 16, 2007 Posts: 889 Location: NYC
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Posted: Mon Jun 20, 2011 10:51 am Post subject:
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So, I'm still trying to understand how this works---the root note of the arpeggio is determined by the Note CV input, right? Does it generate different voltages based on the voltage it "reads" at the CV Note input?
Or does it just play the same selected preset arpeggio sequence, and simply by mixing in the voltage at the Note CV input, achieves the intended note sequence.
How does one order these now? |
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Boogdish
Joined: Sep 21, 2009 Posts: 122 Location: Bloomington, IN
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Posted: Mon Jun 20, 2011 5:17 pm Post subject:
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ericcoleridge wrote: | it just play the same selected preset arpeggio sequence, and simply by mixing in the voltage at the Note CV input, achieves the intended note sequence. |
This way. With controls for what that preset arpeggio sequence is. The input voltage doesn't play into the chip's software in any way.
e-mail me at Michael@Bartonmusicalcircuits.com to order. |
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Skrog Productions
Joined: Jan 07, 2009 Posts: 1196 Location: Scottish Borders
Audio files: 155
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Posted: Tue Jul 19, 2011 11:32 am Post subject:
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been busy over the last couple of weeks....
Finished the panel , fitted the hardware , wired up & powered up , just got the trimmer to set and also adjust a couple of resistor values on my rotary switches , i found that once the volt divider voltage went through the cv mixer / inverter stage the output dropped 0.2 of a volt , i re-calculated the resistors needed again and the rotary switches are selecting functions correctly now , great , i will post up what values i used for the rotarys , i'am running this on 12v.
I realised i forgot the reset for the internal clock , so i drilled a push switch on the panel & also realised that the tempo / rate pot doubles up as the external clock divider control so i put a 2 way switch to select pot for rate control and rotary for division control , all good now, heh .
Sounds to come later in the week .
Fantastic module , im having great fun with this & i got some ideas for a new track .
Dave.
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brother303
Joined: Nov 02, 2010 Posts: 139 Location: ruhr-area/germany
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Posted: Tue Jul 19, 2011 12:41 pm Post subject:
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Hi,
very nice build,as all of your "blueish"-stuff. Hats off!
If you could post the values for the resistors on the switches,would be nice!
_________________ Best regards
Greg |
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