Search found 890 matches

by AlanP
Fri Jan 15, 2021 10:58 pm
Forum: Music Tech DIY
Topic: Eagle Files - VCO, Filters, Touch, and SeqSw
Replies: 62
Views: 2558

Re: Eagle Files - VCO, Filters, Touch, and SeqSw

Anyone tried the touch controller?
by AlanP
Fri Jan 15, 2021 10:58 pm
Forum: Guitars, Basses, Amps & FX
Topic: center negative vs center positive
Replies: 26
Views: 361

Re: center negative vs center positive

Boss used center ground, because DC jacks with normalization for outer contact are extremely common, so the pedal can switch the battery in and out of circuit depending on whether external power is plugged in. That's why. (They use the ring terminal for the input jack to connect ground for the circu...
by AlanP
Tue Jan 12, 2021 10:48 pm
Forum: Music Tech DIY
Topic: Eagle Files - VCO, Filters, Touch, and SeqSw
Replies: 62
Views: 2558

Re: Eagle Files - VCO, Filters, Touch, and SeqSw

I just tried a couple of random ones, and they seemed to work okay. They're cheap enough to risk a couple :)
by AlanP
Sun Jan 10, 2021 11:28 pm
Forum: Music Tech DIY
Topic: Eagle Files - VCO, Filters, Touch, and SeqSw
Replies: 62
Views: 2558

Re: Eagle Files - VCO, Filters, Touch, and SeqSw

I just whacked some ferrites in there. Deliberately open-ended :)
by AlanP
Thu Jan 07, 2021 11:53 pm
Forum: Music Tech DIY
Topic: 2021 : which soldering station, desoldering gun, etc,?
Replies: 35
Views: 719

Re: 2021 : which soldering station, desoldering gun, etc,?

I went from a 40W pencil iron to a FX888D. The jump wasn't in temperature or ease of soldering, for me, so much as being able to use it a few seconds after turning it on (as opposed to waiting a few minutes), and also being able to change the tip if need be.
by AlanP
Sat Jan 02, 2021 5:28 pm
Forum: Music Tech DIY
Topic: Actuating a SPDT with a jack
Replies: 10
Views: 130

Re: Actuating a SPDT with a jack

If I'm understanding you, what you want is to use the normalisation contact on a mono jack, where if nothing is plugged in, then the jack connects to the normalized contact.
by AlanP
Sat Jan 02, 2021 2:26 pm
Forum: Music Tech DIY
Topic: Standing resistors
Replies: 27
Views: 620

Re: Teepee resistors

Topic title is misleading -- as far as I know, teepee resistors are when you need to put two resistors in series to get the value you want for a one-resistor location on a PCB. (One resistor per hole, twist the other two ends together at the top and solder.) What he seems to be describing are standi...
by AlanP
Wed Dec 30, 2020 10:57 pm
Forum: Music Tech DIY
Topic: Troubleshooting sucks, I am stupid, and I hate everything
Replies: 13
Views: 555

Re: Troubleshooting sucks, I am stupid, and I hate everything

What is even worse is when it's a board you designed, and you can't email someone else to bitch about why doesn't this work. At least with things like Mutable PCBs, there is a chance someone else had the same problem.
by AlanP
Mon Dec 28, 2020 11:01 pm
Forum: Music Tech DIY
Topic: Eagle Files - VCO, Filters, Touch, and SeqSw
Replies: 62
Views: 2558

Re: Eagle Files - VCO, Filters, Touch, and SeqSw

skautkurt wrote:
Mon Dec 28, 2020 11:11 am
Not Alan, but I think the ALT just means ALTernative. So, if you chose against using the Tempcos, you have to put an equivalent "normal" resistor there, meaning just a normal 2kohm resistor.
Bingo.
by AlanP
Sun Dec 27, 2020 4:02 am
Forum: Music Tech DIY
Topic: Eagle Files - VCO, Filters, Touch, and SeqSw
Replies: 62
Views: 2558

Re: Eagle Files - VCO, Filters, Touch, and SeqSw

The ALT resistor locations can be used instead. If you later get a tempco resistor, you can remove the ALT resistor and place the tempco.
by AlanP
Mon Dec 21, 2020 1:01 am
Forum: Modular Synth General Discussion
Topic: Module combos you can't live without?
Replies: 25
Views: 821

Re: Module combos you can't live without?

Random voltage source and a comparator, to get random gates. Make it a CV-able comparator, and you can change the probability on the fly.
by AlanP
Sat Dec 19, 2020 6:20 pm
Forum: Eurorack Modules
Topic: Post pics of your euro setup!
Replies: 14689
Views: 2826454

Re: Post pics of your euro setup!

dooj, that looks like such a fun place to be! Also, what type of construction is the house?
by AlanP
Sat Dec 12, 2020 5:33 pm
Forum: Music Tech DIY
Topic: Typhoon BOM
Replies: 4
Views: 267

Re: Typhoon BOM

Does the anode or cathode of the LEDs go into the hole marked '+' ?
by AlanP
Sat Nov 28, 2020 2:11 pm
Forum: Music Tech DIY
Topic: Help with cgs vcf (self oscillating non stop)
Replies: 82
Views: 853

Re: Help with cgs vcf (self oscillating non stop)

ketem13 wrote:
Sat Nov 28, 2020 6:58 am
I omitted the middle section with the 2X22m resistor and 100k/15k resistors.
If you add these in, does it work properly?
by AlanP
Fri Nov 27, 2020 11:10 pm
Forum: Music Tech DIY
Topic: Laser cutting pcbs?
Replies: 12
Views: 315

Re: Laser cutting pcbs?

With absolutely no expertise whatsoever, I'd guess that the copper layer would be the nasty part -- lasers that can cut metal are more expensive than ones that can cut plastic (or plastic like material.)
by AlanP
Fri Nov 27, 2020 11:08 pm
Forum: Music Tech DIY
Topic: Seeing the SMD
Replies: 32
Views: 777

Re: Seeing the SMD

I have a pair of tweezers I got from the supermarket, originally intended for use on eyebrows. I was later given some hard black plastic tweezers with various tips, but I prefer my stainless steel cheapy tweezers. For magnification, I have a lens on a gooseneck stand with a built-in illumination LED...
by AlanP
Wed Nov 25, 2020 2:33 am
Forum: Music Tech DIY
Topic: Why is it fun to BUILD modular synthesizers?
Replies: 25
Views: 694

Re: Why is it fun to BUILD modular synthesizers?

I did the same with guitars first - played them, then wanted to play one I had made so made an acoustic, then an electric and wanted to play it through stompboxes I had made nd through a home-made valve amp and speaker cab. Modular synths seemed like a natural step.... Guitar pedal DIY was a gatewa...
by AlanP
Wed Nov 25, 2020 12:41 am
Forum: Music Tech DIY
Topic: Eagle Files - VCO, Filters, Touch, and SeqSw
Replies: 62
Views: 2558

Re: Eagle Files - VCO, Filters, Touch, and SeqSw

The Wave-Ctl and Sine-Trim trimpots are interactive, to a degree -- you'll need to adjust both at once to get the best sine wave. Make sure the panel pot is set to Sine before doing so (I don't wanna talk about it...) and flick it back to the other waveform after trimming the Sine to check how the o...
by AlanP
Thu Nov 19, 2020 6:11 pm
Forum: Music Tech DIY
Topic: Eagle Files - VCO, Filters, Touch, and SeqSw
Replies: 62
Views: 2558

Re: Eagle Files - VCO, Filters, Touch, and SeqSw

Use the values from the 0.2 schem.
by AlanP
Thu Nov 19, 2020 4:08 pm
Forum: Eurorack Modules
Topic: Module which unexpectedly blew you away?
Replies: 108
Views: 5560

Re: Module which unexpectedly blew you away?

Mutable Elements. I soldered one because I figured it might be good for making "more natural" sounds, but I didn't expect it to sound good to the point where I had to force myself to not use it in patches. RYO 3xVCA. It's such a humble little module, but it's a real workhorse, useful in damn near ev...
by AlanP
Thu Nov 19, 2020 1:57 pm
Forum: Music Tech DIY
Topic: Eagle Files - VCO, Filters, Touch, and SeqSw
Replies: 62
Views: 2558

Re: Eagle Files - VCO, Filters, Touch, and SeqSw

1 - Infinity means omit the resistor entirely. I put in the values in my schematic to comply with Mark's table, and the result should match the panel. I included the omitted resistor locations in case someone wanted, say, a dual vco with ramp on both sides and no square. 2 - I used 100kB everywhere,...
by AlanP
Sun Nov 15, 2020 7:49 pm
Forum: Music Tech DIY
Topic: performer (or is it per|former?) sequencer build
Replies: 762
Views: 51640

Re: performer (or is it per|former?) sequencer build

Michigan Synth Works did a limited run with thonkiconns. I think they're currently sold out.
by AlanP
Fri Nov 13, 2020 10:33 pm
Forum: Music Tech DIY
Topic: Schematic drawing styles
Replies: 28
Views: 954

Re: Schematic drawing styles

ibanez_sb7-02-schematic.pdf_1.png
The only good way of reading this schematic involves printing it out, and spending some quality time with some highlighters to try and trace wtf is going on. (Ibanez SB7 Bass Synth pedal.)
by AlanP
Mon Nov 09, 2020 11:07 pm
Forum: Music Tech DIY
Topic: Eagle Files - VCO, Filters, Touch, and SeqSw
Replies: 62
Views: 2558

Re: Eagle Files - VCO, Filters, Touch, and SeqSw

I use Seeedstudio's CAM file for generating 2-layer PCBs, with Eagle 7.5.0. All the holes above 3.2mm in diameter are in the Dimension layer, as is the board outline.
by AlanP
Sun Nov 01, 2020 8:30 pm
Forum: Music Tech DIY
Topic: The 2020 Show Us Your DIY Builds Thread!
Replies: 519
Views: 45724

Re: The 2020 Show Us Your DIY Builds Thread!

http://alanp.info/images/esppanel.JPG http://alanp.info/images/espguts.JPG I built a Mutable Shruthi XT with a Polivoks VCF, and liked the sound so much that I wanted to build a eurorack Polivoks VCF module. I only spotted that Erica Synths released their gerber files a few days after submitting th...

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