Search found 129 matches

by ali_g12
Thu Apr 25, 2019 6:00 am
Forum: Announcements - Please read!
Topic: Mike has passed away.
Replies: 917
Views: 114591

Thanks for the forum and community Mike.
by ali_g12
Tue Oct 02, 2018 1:31 am
Forum: Music Tech DIY
Topic: Arp 1601 Sequencer clone
Replies: 1988
Views: 156068

Is it too late for boats? If not then 2 for me please!
by ali_g12
Sun Aug 20, 2017 9:48 am
Forum: Music Tech DIY
Topic: TTSH Ver.3 (rev.8) General build thread
Replies: 2031
Views: 124269

MIDI Implant stuck notes

I have a strange issue with intermittent stuck notes on a MIDI Implant/Gatebooster. Having provided a fully tested and calibrated TTSH to someone last week I had to return to address issues he was experiencing with stuck notes. I took my own TTSH to see if I could replicate the fault on that one too...
by ali_g12
Tue Jan 17, 2017 5:03 am
Forum: Music Tech DIY
Topic: The 'Who Can Build Me a TTSH?' Thread
Replies: 160
Views: 24006

I currently have a V2 for sale (the last of 4 builds from this batch).

I will be building another 4 this coming year starting end of February.

I also build ARP 2600 replica cases for the TTSH. There are pictures earlier in this thread.

References available.
by ali_g12
Thu Sep 22, 2016 12:29 pm
Forum: Music Tech DIY
Topic: Two Thousand Six Hundred (TTSH) Roadcase Build Thread
Replies: 70
Views: 13507

Nice work el-bee! Just did my final run of cases. Had the ever watchful Roger the cat to oversee quality control once again. http://i279.photobucket.com/albums/kk129/ali_g12/1_zpsvgraxlht.jpg http://i279.photobucket.com/albums/kk129/ali_g12/5_zpsguox9oya.jpg http://i279.photobucket.com/albums/kk129/...
by ali_g12
Wed Apr 20, 2016 1:34 pm
Forum: Oakley Sound Systems
Topic: No sine coming from VCO controller
Replies: 1
Views: 1117

No sine coming from VCO controller

After doing a a thorough calibration and redesigning the normalisation today i have decided to get to the bottom of this. I can get a square wave out but no sine. Have checked my connections to the output PCB where the jacks are mounted and all appears OK. Need a schematic to get a better idea. Sugg...
by ali_g12
Tue Nov 10, 2015 7:34 pm
Forum: Music Tech DIY
Topic: Two Thousand Six Hundred (TTSH) Ver.2 General build thread
Replies: 1494
Views: 97308

Can't trim +/-15VDC

I have just completed a build and am implementing the final mods (MIDI + gatebooster, Osc sync) and I checked the power test points and noticed that they had crept up to 16v. Now I can't seem to trim them any lower than +/-15.5V. I remember trimming them to 15.00V after building the power section an...
by ali_g12
Tue Oct 06, 2015 5:15 pm
Forum: Music Tech DIY
Topic: The 'Who Can Build Me a TTSH?' Thread
Replies: 160
Views: 24006

In the process of building some more TTSHs. References available.

https://www.muffwiggler.com/forum/viewt ... 12#2016812
by ali_g12
Mon Sep 07, 2015 6:07 pm
Forum: Music Tech DIY
Topic: Two Thousand Six Hundred (TTSH) Ver.2 General build thread
Replies: 1494
Views: 97308

I finished my TTSH V2 over the weekend, it just needs a case, gate booster and VCO sync mod. Thankfully it worked first time :yay: Nice wiring. :help: Having problems with my (non-gateboosted) MIDI Implants on both my TTSH builds: The gate signal from the MIDI implant doesn't seem to trigger the en...
by ali_g12
Sat Sep 05, 2015 11:19 am
Forum: Music Tech DIY
Topic: Two Thousand Six Hundred (TTSH) Ver.2 General build thread
Replies: 1494
Views: 97308

............I have discovered that on the unit that won't calibrate all three pins of the 25K trimmer have continuity to the CV input. The unit that will calibrate has pin 3 on the trimmer with continuity to ground. It seems that this is the root of the problem. Can't work out where the short is at...
by ali_g12
Tue Sep 01, 2015 4:12 pm
Forum: Music Tech DIY
Topic: Two Thousand Six Hundred (TTSH) Ver.2 General build thread
Replies: 1494
Views: 97308

I also seem to have some problem with oscillator frequency sliders affecting each other ie. with only OSC 1 turned up on the mixer I can change the pitch slightly with the OSC2 and OSC3 frequency sliders. It seems the problem with the frequency sliders affecting each other is due to the fact that I...
by ali_g12
Tue Sep 01, 2015 3:06 pm
Forum: Music Tech DIY
Topic: Two Thousand Six Hundred (TTSH) Ver.2 General build thread
Replies: 1494
Views: 97308

For two days I've been fighting a weird V/oct calibration issue on all three VCOs. The VCOs calibrate perfectly at low C and high C, but all the pitches in between are progressively flat with middle C being the most flat at almost a semitone. And all the pitches outside of low C and high C are also...
by ali_g12
Wed Aug 12, 2015 1:47 pm
Forum: Music Tech DIY
Topic: The 'Who Can Build Me a TTSH?' Thread
Replies: 160
Views: 24006

I can build you a flightcase: https://www.muffwiggler.com/forum/viewtopic.php?t=143938&highlight= http://i279.photobucket.com/albums/kk129/ali_g12/IMG_1118_zpskklryvik.jpg http://i279.photobucket.com/albums/kk129/ali_g12/IMG_1105_zpsdu8xdyun.jpg http://i279.photobucket.com/albums/kk129/ali_g12/IMG_1...
by ali_g12
Wed Aug 12, 2015 1:42 pm
Forum: Music Tech DIY
Topic: 2600 clone - Two Thousand Six Hundred (TTSH)
Replies: 4203
Views: 576744

A couple of TTSHs came into the world today under the watchful eye of Chairman Miao: http://i279.photobucket.com/albums/kk129/ali_g12/IMG_1134_zps7ea9ndqu.jpg http://i279.photobucket.com/albums/kk129/ali_g12/IMG_1118_zpskklryvik.jpg http://i279.photobucket.com/albums/kk129/ali_g12/IMG_1137_zpsxmzxcd...
by ali_g12
Wed Aug 12, 2015 1:03 pm
Forum: Music Tech DIY
Topic: Two Thousand Six Hundred (TTSH) Roadcase Build Thread
Replies: 70
Views: 13507

TTSH Roadcase

All work overseen by the chief architect - Chairman Miao: http://i279.photobucket.com/albums/kk129/ali_g12/IMG_1134_zps7ea9ndqu.jpg http://i279.photobucket.com/albums/kk129/ali_g12/IMG_1130_zps7fqjbxfl.jpg http://i279.photobucket.com/albums/kk129/ali_g12/IMG_1105_zpsdu8xdyun.jpg http://i279.photobuc...
by ali_g12
Wed Aug 12, 2015 12:58 pm
Forum: Music Tech DIY
Topic: Two Thousand Six Hundred (TTSH) Roadcase Build Thread
Replies: 70
Views: 13507

TTSH Roadcase

Hi Folks, Been TTSHing for the past couple of months and ended designing and building a replica ARP 2600 roadcase. I intend to do a small run of these for sale and will post an ad up in the for sale section (not sure if I've got enough posts yet!). I intend to just do half flight cases without lid u...
by ali_g12
Sun Jun 28, 2015 4:12 pm
Forum: Music Tech DIY
Topic: Two Thousand Six Hundred (TTSH) Ver.1 General build thread
Replies: 2939
Views: 304380

Oh. You posted this in the Ver 1 thread, but you have a ver 2 board. Then it's a whole different kettle of fish. Might want to try this question in that thread - https://www.muffwiggler.com/forum/viewtopic.php?t=130493 Oh, I think I know what's going on. Do you mean the thing labeled jumper between...
by ali_g12
Sat Jun 27, 2015 6:29 pm
Forum: Music Tech DIY
Topic: Two Thousand Six Hundred (TTSH) Ver.1 General build thread
Replies: 2939
Views: 304380

Can anyone provide further advice on the likely cause of the problem and any fault finding techniques I can use to try and locate it. Thanks in advance. sduck gave you a very good hint: isolate the fault by testing the various sub sections on their own. disconnect the supply voltage from all sub mo...
by ali_g12
Sat Jun 27, 2015 3:03 pm
Forum: Music Tech DIY
Topic: Two Thousand Six Hundred (TTSH) Ver.1 General build thread
Replies: 2939
Views: 304380

The only thing that jumper in the power section does is connect two parts of the ground plane that normally shouldn't be connected. So removing it shouldn't change the + or - line voltages. There is most likely a solder bridge somewhere, or something like that. The good thing about ver 1 is that yo...
by ali_g12
Fri Jun 26, 2015 12:13 pm
Forum: Music Tech DIY
Topic: Two Thousand Six Hundred (TTSH) Ver.1 General build thread
Replies: 2939
Views: 304380

The only thing that jumper in the power section does is connect two parts of the ground plane that normally shouldn't be connected. So removing it shouldn't change the + or - line voltages. There is most likely a solder bridge somewhere, or something like that. The good thing about ver 1 is that yo...
by ali_g12
Fri Jun 26, 2015 11:10 am
Forum: Music Tech DIY
Topic: Two Thousand Six Hundred (TTSH) Ver.1 General build thread
Replies: 2939
Views: 304380

Power section tests

I'm quite far into building two TTSHs and have encountered what I think is a problem with the +ve power rail on both boards. One board is 99% complete in terms of components with only jacks, switches and sliders not yet installed. The other board is also missing these parts and and, in addition, all...
by ali_g12
Mon Mar 17, 2014 1:26 pm
Forum: Music Tech DIY
Topic: PolyDAC scaling and tuning
Replies: 23
Views: 1411

To test if that is true: connect the device to a source of programmable MIDI data and send a test sequence of notes all with the same, low, velocity. The measured pitc CV would be much more repeatable if velocity is not changing and is the voltage being output for velocity is low. I guess I've alre...
by ali_g12
Mon Mar 17, 2014 10:41 am
Forum: Music Tech DIY
Topic: PolyDAC scaling and tuning
Replies: 23
Views: 1411

Perhaps velocity CV is affecting the pitching CV via crosstalk in the multiplexer? I don't know what 4067 you are using but for this one: http://www.nxp.com/documents/data_sheet/HEF4067B.pdf It states that the (typical) crosstalk is 50mV for VDD=10V. The multiplexer is a HEF4067BP. I'm no electroni...
by ali_g12
Mon Mar 17, 2014 10:10 am
Forum: Music Tech DIY
Topic: PolyDAC scaling and tuning
Replies: 23
Views: 1411

I have found another MIDI controller to test and this has the same effect on pitch, higher velocity = higher KCV/pitch. This controller has a number of velocity curves and when I turn the velocity control to a flat response the problem is solved. Pitch is constant at all velocities. However, I would...
by ali_g12
Mon Mar 17, 2014 8:16 am
Forum: Music Tech DIY
Topic: PolyDAC scaling and tuning
Replies: 23
Views: 1411

So the third option is that some other variable signal is being mixed in - and it is. Thanks Nantonos - I'm beginning to get to the bottom of this now. I have noticed that the tuning is sensitive to the velocity of the key strike so if I gently push the key repeatedly to try and achieve the softest...

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