Search found 2381 matches

by NV
Mon Oct 05, 2020 8:46 pm
Forum: Music Tech DIY
Topic: Duplicating old PCBs... strategies? tips?
Replies: 14
Views: 527

Re: Duplicating old PCBs... strategies? tips?

Rebuilding it from schematic to rats nest layout is the most flexible but the most labor intensive, depending on the efficiency of your EDA setup. It's easier to change things as needed, like an equivalent replacement component is now SMD or a different pinout. If you have the schematic in EDA you c...
by NV
Mon Oct 05, 2020 7:32 pm
Forum: Music Tech DIY
Topic: Rotary switches with same height as RD901/ RK09
Replies: 17
Views: 342

Re: Rotary switches with same height as RD901/ RK09

Thank you! I also found the Alpha SR1712F, seems to be Alphas equivalent with some two pole versions aswell. But it seems like I can forget the metal shaft. Placing a nut and washer directly over the top of the SR1712 brings the height to 10mm (between 10.2mm and 9.8mm with tolerance). You need the...
by NV
Fri Oct 02, 2020 8:04 am
Forum: Music Tech DIY
Topic: Fav technique for washing water soluble flux?
Replies: 11
Views: 230

Re: Fav technique for washing water soluble flux?

the Kester 331 datasheet calls for water at 120 - 140F which is probably a fair bit warmer than your "bath warm" water Automated board washing has different expectations. Agitate the solute with a toothbrush and you’re increasing the dissolution rate in other ways. 110 F won’t burn the hands and is...
by NV
Fri Oct 02, 2020 4:10 am
Forum: Music Tech DIY
Topic: Fav technique for washing water soluble flux?
Replies: 11
Views: 230

Re: Fav technique for washing water soluble flux?

My area has very hard water, where every sink has technicolor rings of red/green/white. With water soluble flux I run the board under bath warm tap water and scrub it with a soft bristle toothbrush. Once it's clean I give both sides a quick rinse in distilled water. A gallon is $2 and rinses maybe a...
by NV
Tue Sep 29, 2020 10:08 pm
Forum: Music Tech DIY
Topic: Solder Paste Particle Size
Replies: 9
Views: 231

Re: Solder Paste Particle Size

Generally type 3 is fine down to rectangular stencil apertures of 9 mil diameter. For comparison a part with 0.5mm lead spacing (like STM32 TQFP/LQFP packages) will have apertures around 10 mil. When stenciling a part with 0.5mm lead spacing if you shift the stencil 0.25mm you're between pads, so it...
by NV
Sat Sep 26, 2020 3:42 am
Forum: Music Tech DIY
Topic: xicon minimum order on Mouser
Replies: 23
Views: 516

Re: xicon minimum order on Mouser

Yeah, I noticed this. I'm not sure about Yaego, but one of the best bits about Xicon resistors is that it's straightforward to guess the part ID. Yageo isn't as simple but still readable. Here's a bolded example: MFR- 25 FBF52- 100K = TH 1/4W (25) resistor in 100K value RT 0603 FRE07 100R L = SMD 0...
by NV
Thu Sep 10, 2020 6:09 pm
Forum: Music Tech DIY
Topic: Why two sets of power pins on europower breadboard friend?
Replies: 5
Views: 156

Re: Why two sets of power pins on europower breadboard friend?

Likely for easy daisy chaining to power additional breadboards.
by NV
Wed Aug 26, 2020 1:56 pm
Forum: Music Tech DIY
Topic: Question on edge connectors
Replies: 8
Views: 200

Re: Question on edge connectors

Polysynths like Dave Smith's use DIMM for voice cards, but there are some caveats. The JEDEC standards are for attached modules to be only 1.2" tall off the connector so they aren't intended for large cards without extra mechanical reinforcement. They're also rated at 25 mating cycles so they aren't...
by NV
Tue Aug 25, 2020 4:26 pm
Forum: Music Tech DIY
Topic: T18 vertical/knurled shaft, 9mm, B100k.
Replies: 7
Views: 220

Re: T18 vertical/knurled shaft, 9mm, B100k.

The RD part is metal shaft, 15mm height, with 18 teeth (T18). The RV part you linked is plastic shaft, 20mm height, with 40 teeth (like a minipot). The 15K on the RD part means T18 knurled, but the 20K on the RV part means 40-tooth. For T18 on the RV you'll want 20B or 15B. If you're ok with round o...
by NV
Mon Aug 24, 2020 11:33 pm
Forum: Music Tech DIY
Topic: Suggested ways to supply + and - power :: bench power supply?
Replies: 16
Views: 370

Re: Suggested ways to supply + and - power :: bench power supply?

Bench supplies are one of those tools that really improve as the price goes up. Bargain bench supplies are designed for very basic uses, like injecting a voltage here and seeing what comes out there. Powering modules with one may be a headache inducer that taints some circuits and not others. A well...
by NV
Wed Aug 05, 2020 11:03 pm
Forum: Music Tech DIY
Topic: "Component Kits" - BOMs or other packages for ICs/Caps/etc?
Replies: 3
Views: 161

Re: "Component Kits" - BOMs or other packages for ICs/Caps/etc?

I think it's best to accrue components as you go rather than try to create a base. When a project needs a few dozen 10k resistors it often ends up being the same price or cheaper to hit a quantity breakpoint like 100. In time that naturally builds a stock of parts. If you buy a "starter kit" of part...
by NV
Fri Jul 24, 2020 7:15 pm
Forum: Music Tech DIY
Topic: Reducing Depth of Strom Power Module
Replies: 7
Views: 220

Re: Reducing Depth of Strom Power Module

The Behringer cases allow 38mm module depths. I'm going to guess the distance between each board here is the standard 11mm which means with a ribbon IDC fitted (adds about 6mm) this module is likely close to 50mm. If you swapped to a right angle header, removed the rear Molex link connector, changed...
by NV
Thu Jul 09, 2020 1:35 pm
Forum: Music Tech DIY
Topic: Coloured panels on DIY modules...
Replies: 11
Views: 507

Re: Coloured panels on DIY modules...

Many PCB houses offer FR4 in blue, red, green, purple, yellow, black, and white. Usually glossy but matte options are becoming more common. Some also offer metal core PCBs but the machining on those tends to be pretty rough unless you're paying a premium. This would be the cheapest route and limits ...
by NV
Tue Jun 23, 2020 9:14 pm
Forum: Music Tech DIY
Topic: [Kits Available!] Eurorack Klee Panel and Daughterboard
Replies: 1676
Views: 141811

Re: [Kits Available!] Eurorack Klee Panel and Daughterboard

I have one other question. I want to use blue led for the B side led at the top. all of them i have seen require 2.2v to 2.4v to operate. Using 4.7k resistors i can only get 1.9V. if I reduce the resistors to 1K will that increase the voltage enough to use these leds? The CD4034s provide about 11.5...
by NV
Tue Jun 23, 2020 7:24 am
Forum: Music Tech DIY
Topic: Antumbra ATN8 as Precision Adder?
Replies: 1
Views: 175

Re: Antumbra ATN8 as Precision Adder?

The resistors don't account for the offset in the op amps. TL07x can clear 5mV offset, which is enough pitch error for most to notice. Stack a few with some bad luck and things can get rough. You could swap in precision op amps but without a schematic it's hard to say if there may be other issues pr...
by NV
Sun Jun 21, 2020 8:25 am
Forum: Music Tech DIY
Topic: [Kits Available!] Eurorack Klee Panel and Daughterboard
Replies: 1676
Views: 141811

Re: [Kits Available!] Eurorack Klee Panel and Daughterboard

With all switches in the positions you recommended pressing the Step button makes all of the steps work as expected except they do not recycle back to 1 after step 8 but instead go thru all 16 steps and cycle back then. I would think that this is normal given the middle switch is 16x1 but I an just...
by NV
Sat Jun 20, 2020 10:22 pm
Forum: Music Tech DIY
Topic: [Kits Available!] Eurorack Klee Panel and Daughterboard
Replies: 1676
Views: 141811

Re: [Kits Available!] Eurorack Klee Panel and Daughterboard

During the clock and shift register test, only the 1 and 2 Stage Pattern LEDs light up with the switches in the positions described in the test set up. I can get all the pattern leds to sequence on if i set the Gate Bus load switch to on instead of off. This does not seem to follow the correct test...
by NV
Sat Jun 20, 2020 3:47 pm
Forum: Music Tech DIY
Topic: [Kits Available!] Eurorack Klee Panel and Daughterboard
Replies: 1676
Views: 141811

Re: [Kits Available!] Eurorack Klee Panel and Daughterboard

Nee a little guidance. I finished the project and upon power up stuff seems to work except non of the B side leds at the top light up when i load a setting. All of the Slider leds do light up and change patterns as i press load or step. Any idea why only the B leds don' light? Thanks. It sounds lik...
by NV
Thu Jun 11, 2020 10:13 am
Forum: Music Tech DIY
Topic: [Kits Available!] Eurorack Klee Panel and Daughterboard
Replies: 1676
Views: 141811

Re: [Kits Available!] Eurorack Klee Panel and Daughterboard

I did some more testing. For some reason, I can measure a positive voltage (~12V) on both legs of the LEDs for the steps for example. Only the right side of the plugs have an effect on getting the LEDs to light up (e.g. Clock in, Master or Bus 1 out). So from that I gather that the panel doesn't ge...
by NV
Thu Jun 11, 2020 12:04 am
Forum: Music Tech DIY
Topic: [Kits Available!] Eurorack Klee Panel and Daughterboard
Replies: 1676
Views: 141811

Re: [Kits Available!] Eurorack Klee Panel and Daughterboard

Do the bit and gate output LEDs work? In other words, are the slider LEDs the only ones not turning on? If you flip all the bit switches up and hit the Load button, do all the bit LEDs light up while the slider LEDs stay dark? Nothing lights up. I'm assuming some weird ground issue as it takes the ...
by NV
Wed Jun 10, 2020 10:53 pm
Forum: Music Tech DIY
Topic: [Kits Available!] Eurorack Klee Panel and Daughterboard
Replies: 1676
Views: 141811

Re: [Kits Available!] Eurorack Klee Panel and Daughterboard

PDF edits can be weird and sometimes not read for others - can someone pull a quick download of the "Building the electro-music Klee Sequencer" PDF I attached to the 2nd post and confirm that on p.112 there's a red note indicating the correction? Thanks whoever helps out!
by NV
Wed Jun 10, 2020 10:34 pm
Forum: Music Tech DIY
Topic: [Kits Available!] Eurorack Klee Panel and Daughterboard
Replies: 1676
Views: 141811

Re: [Kits Available!] Eurorack Klee Panel and Daughterboard

1) When powered up, nothing lights up. I configured the Klee so that the LEDs in the sliders are constantly on. Only when a plug is in for example clock input, everything comes alive. The Klee itself is functioning without this as I was able to conduct part of the calibration. Do the bit and gate o...
by NV
Wed Jun 03, 2020 9:52 am
Forum: Music Tech DIY
Topic: CoolAudio VTL5C3 - Anyone Tried Them?
Replies: 15
Views: 611

Re: CoolAudio VTL5C3 - Anyone Tried Them?

For my curiosity, what's the quantity price? I'm still wondering what parts Buchla is using in the new 208, and if Buchla is in the same 'trial and error' position as DIY builders. $2/ea if ordering 1,000 or more. Cool Audio has a minimum order of $2,000 so if all you’re getting is vactrols then yo...
by NV
Mon May 25, 2020 4:11 pm
Forum: Music Tech DIY
Topic: [Kits Available!] Eurorack Klee Panel and Daughterboard
Replies: 1676
Views: 141811

Re: [Kits Available!] Eurorack Klee Panel and Daughterboard

Anyone know why the Klee no longer appears to be on Modulargrid? Looks like there are still a couple entries but they don't show up in a search for "Klee" for some reason. https://www.modulargrid.net/e/other-unknown-euro-klee-electro-music-com-pcb-nv-s-panel-daughterboard https://www.modulargrid.ne...
by NV
Thu May 21, 2020 11:31 pm
Forum: Music Tech DIY
Topic: [Kits Available!] Eurorack Klee Panel and Daughterboard
Replies: 1676
Views: 141811

Re: [Kits Available!] Eurorack Klee Panel and Daughterboard

Hi Tim and everybody else here. I've finally got round to calibrating my Klee and am having trouble trimming R34 to -0.333V, using the trimmer I can only go as low as -8.2V. All other trim pots for the other range switch positions calibrate fine. Any ideas? Much appreciated. Can you clarify what yo...

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