Search found 339 matches

by sicpaul
Sat Jan 25, 2020 6:21 am
Forum: Music Tech DIY
Topic: Mutable Module Tester
Replies: 59
Views: 4649

Re: Mutable Module Tester

If you have Eagle (even just the free version) you should be able to open up the schematic and figure it out from there by tracing it there (and comparing to the datasheet for the power module, if necessary). Should be pretty pretty easy to spot which pin goes where from the power connector. I'm no...
by sicpaul
Fri Jan 24, 2020 1:35 pm
Forum: Music Tech DIY
Topic: Mutable Module Tester
Replies: 59
Views: 4649

Re: Mutable Module Tester

Hello Wigglers, I'm nearly finished building version 2 of the Module Tester. That is the one with the very expensive TRACO POWER TEL 5-1222. Before destroying it with wrong polarity of DC wall wart, could anyone tell me if the center pin of wall wart connector expects plus or minus (or if it doesn't...
by sicpaul
Thu Dec 12, 2019 7:31 am
Forum: Music Tech DIY
Topic: Developing the Super Sixteen Step Sequencer (eurorack)
Replies: 26
Views: 3256

extralifedisco wrote: I hope to have a BOM on Octopart in the next day or two - just need to swap out a few parts from the last order I made.
This will be a big help.

And many, many thanks for your detailled answers :yay:
by sicpaul
Fri Dec 06, 2019 7:13 pm
Forum: Music Tech DIY
Topic: Developing the Super Sixteen Step Sequencer (eurorack)
Replies: 26
Views: 3256

Superb project! :yay: The videos are really helpful in understanding how in general such a project is done and especially the display is driven. Allthough i am far from getting all details to develop my own :hihi: Well the sequencer's realtime modifying feature is such a cool thing that i'm going to...
by sicpaul
Sun Aug 25, 2019 1:26 pm
Forum: Music Tech DIY
Topic: System-100 Model-101 & 102 in eurorack
Replies: 163
Views: 13035

Thanks. Inbetween i ordered my parts and build the VCO. For those who don't immediately hear sound after building VCO: When you are sure there is no error in building connect Tri Out and for a quick start turn back and forth VR4=VR205 until you hear anything. There is only a small spot (maybe you ha...
by sicpaul
Tue Aug 06, 2019 11:21 am
Forum: Music Tech DIY
Topic: System-100 Model-101 & 102 in eurorack
Replies: 163
Views: 13035

Hi, Data sheet tells me: 2SC945Q has got a gain between 135 and 270. 2SC945P (those from Reichelt) is between 200 and 400. Since I'm very bad in desoldering, i want to ask before, if i can use the "P" version in all places (in Sys-700 too?), or if there are some places, where the lower gain of "Q" i...
by sicpaul
Fri Sep 21, 2018 5:47 pm
Forum: Music Tech DIY
Topic: [PCB] Thomas Henry's 555-VCO, 2nd run! check PMs
Replies: 1022
Views: 116980

Re: Thermistor

Hey!! What happen if i put a 2k resistor instead of the 2k +3500ppm thermistor You will get an oscillator which is not tracking well on different temperatures. There are allways little temperature drifts, so calibrating 1V/oct will be a horror and would not last long. You can use a 2k resistor for ...
by sicpaul
Wed Sep 12, 2018 5:46 pm
Forum: Music Tech DIY
Topic: Question due to tolerance of resistor networks
Replies: 2
Views: 126

Thanks Dustin,

seems to be good news, so i'll give it a try
by sicpaul
Wed Sep 12, 2018 10:28 am
Forum: Music Tech DIY
Topic: Question due to tolerance of resistor networks
Replies: 2
Views: 126

Question due to tolerance of resistor networks

Hello experienced wigglers, while planing several octave switches for VCOs i thought of using available resistor networks, but i do not know what their given 2% tolerance is for: A) all internal resistors equal but max 2% from nominal value B) all internal resistors may vary 2% from each other (and ...
by sicpaul
Wed Aug 08, 2018 2:51 pm
Forum: Music Tech DIY
Topic: Erica Synths DIY Bassline
Replies: 14
Views: 2846

Hi Girts,

as i did order a PCB-set (and some other stuff) i took a look at the BOM leaving one question: What is the difference between the two 250k Pots?
I usually order the 9mm pots at TAYDA, so RD901/2 packages don't tell me too much. Are you able to give me a hint?
Best regards
(sic)paul
by sicpaul
Tue Jun 12, 2018 4:56 am
Forum: Music Tech DIY
Topic: The 2018 Show Us Your DIY Builds Thread
Replies: 840
Views: 63622

dot matrix madness wrote:
sicpaul wrote:Just finished two little helpers in 4HP, i call them cut-CV-generators. They differ only in the switches (push type vs hand gear).
:yay: Nice! How did you make the front panels?
Laser cutting white (opaque) acryl, filling engravings with black edding marker.
by sicpaul
Mon Jun 11, 2018 7:20 pm
Forum: Music Tech DIY
Topic: The 2018 Show Us Your DIY Builds Thread
Replies: 840
Views: 63622

Just finished two little helpers in 4HP, i call them cut-CV-generators. They differ only in the switches (push type vs hand gear). I allways use a very slow LFO, Key-CV and an EG for filters but most commercial VCFs do only have two CV inputs. So i combined an ADSR (from Yves Usson) and a simple Tri...
by sicpaul
Mon Apr 23, 2018 11:27 am
Forum: Music Tech DIY
Topic: DIY MP7 'fully loaded'
Replies: 72
Views: 6300

hi Boogie,

amazing project sounding outragous :yay:
mark me highly interested
by sicpaul
Sat Apr 14, 2018 1:43 pm
Forum: Music Tech DIY
Topic: 3046 expo temp.compensation with different voltages
Replies: 16
Views: 711

Thanks a lot. i do have a smd 3096 in stock. i'll give it a try.
by sicpaul
Sat Apr 14, 2018 11:39 am
Forum: Music Tech DIY
Topic: 3046 expo temp.compensation with different voltages
Replies: 16
Views: 711

Sorry Jarno,
i had an error in my former question (corredted now)., i want to control all TH VCOs using LM13700 or CA3080 with a heatetd 3046 expo converter and do look for a schematic for that.
by sicpaul
Sat Apr 14, 2018 6:14 am
Forum: Music Tech DIY
Topic: 3046 expo temp.compensation with different voltages
Replies: 16
Views: 711

NPN vs PNP has to do with which direction the current needs to flow into the circuit. the NPN sinks current, so it pulls current into itself from a higher voltage, whereas the PNP sources current, so it pushes current out into a lower voltage. PNP is usually used for LM13700 or 3080 circuits where ...
by sicpaul
Fri Apr 13, 2018 10:20 am
Forum: Music Tech DIY
Topic: 3046 expo temp.compensation with different voltages
Replies: 16
Views: 711

Hi wigglers, my System-X VCO with fitzgreyve's 3046 temp. compensation is my most stabile built, so i wish to modify several Thomas Henry VCOs. Sorry, my abilities in deeply circuit understanding are rather poor, so following questiones occure: 1. Is it that simple to replace Q1/Q2 (LM394/matched 39...
by sicpaul
Sat Jul 01, 2017 6:30 pm
Forum: Music Tech DIY
Topic: TWO59 SHAPER module (Building Thread) by FEEDBACK
Replies: 139
Views: 12627

After a longer break i was able to finish my shaper, but i got two issues: 1. I can't set the 3-position switch to Square, in middle position it is triangle as well as switched down. Since i used an ON-ON-ON (3-Pos) switch i guess i should have used an ON-OFF-ON type, right? (Looking at schematics t...
by sicpaul
Thu May 18, 2017 4:26 pm
Forum: Music Tech DIY
Topic: What is your suggestion for fuses for my euro power supply?
Replies: 1
Views: 162

What is your suggestion for fuses for my euro power supply?

Dear wigglers, all my former attempts to power up my system left me either straight forward in getting poor or not having enough stability. (two doepfer supplies are too weak) So i bought 2 toshiba laptop supplies (switching regulators, 5A, 15V each) and stabilised each with 100nF parallel to 2 x 47...
by sicpaul
Tue Apr 25, 2017 3:04 pm
Forum: Music Tech DIY
Topic: [Project] Kraft Bass Drum (Vox Percussion King inspired)
Replies: 7
Views: 1420

looks ... sounds to be a little nice additional bass drum 4 my euro system :love:

since i'd love to do my own panel (4HP) i'd like to get one of the 45x60mm pcbs :guinness:
by sicpaul
Thu Mar 16, 2017 6:50 am
Forum: Music Tech DIY
Topic: ornaments+crimes extended / polymorphic 4x16bit CV generator
Replies: 2500
Views: 143996

Hey, double crime, nice! Does that use a custom PCB or flying leads to two standard PCBs? Could we see a photo of the back? And a higher-res photo of the front (and the single one too)? I might create a gallery of O&C builds and panels on the O&C web site. My last pcbs designed with fritzing had to...
by sicpaul
Wed Mar 15, 2017 10:07 am
Forum: Music Tech DIY
Topic: ornaments+crimes extended / polymorphic 4x16bit CV generator
Replies: 2500
Views: 143996

Finished another 2 singles of those superb modules and a space saving 16HP "double crime":
Image

Now it's time to try out the new version 1.2 features :guinness: ;-)
(and to find some nice knobs)

Thanks again Max, Pld & Timmy :yay:
by sicpaul
Wed Jan 25, 2017 6:33 am
Forum: Music Tech DIY
Topic: [Order] Roland 100M VCO PCBs/panels aka System X Oscillator
Replies: 164
Views: 22946

thread of octave switch: viewtopic.php?t=118055
I love mine :love: - not to forget i love the whole Sys-X VCO(s)
thanks to Mark and Rick :yay:
Maybe of interest too: 100m/Sys-X VCO driver (including Octave switch)
by sicpaul
Wed Dec 21, 2016 7:30 pm
Forum: Music Tech DIY
Topic: Any Berlin wiggler successful build Phonic Taxidermist?
Replies: 0
Views: 111

Any Berlin wiggler successful build Phonic Taxidermist?

Dear wigglers i tried to build a Phonic Taxidermist but i got only distortion working and no echos at all (allready posted in Phonic Taxidermist thread) . After testing switch connections and several other checking i ordered more RAM and echo chips from different providers but no echo at all. So i d...
by sicpaul
Tue Dec 20, 2016 9:22 am
Forum: Music Tech DIY
Topic: Anyone ordered a TH book recently at Lulu.com
Replies: 13
Views: 535

I recently bought the TH Synth for the 21st century book, payed via paypal. It took a while, but today it arrived. As mentioned spiral binding and excellent quality.

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