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by negativspace
Wed Jan 22, 2020 12:10 am
Forum: Music Tech DIY
Topic: [IN STOCK] Buchlidian Voltage Proc PCB, Euro Panel (CVP)
Replies: 1027
Views: 78863

Re: [IN STOCK] Buchlidian Voltage Proc PCB, Euro Panel (CVP)

Cheers Jay, thanks... and yeah. I've tested the prototype and ordered the boards. For at least the next couple hundred units, this is what they'll be.

Worst-case scenario I can install an LT1013 here on any DIY orders, but I think the chips are easy enough to source and run less than $2.
by negativspace
Tue Jan 21, 2020 3:57 pm
Forum: Music Tech DIY
Topic: [IN STOCK] Buchlidian Voltage Proc PCB, Euro Panel (CVP)
Replies: 1027
Views: 78863

Re: [IN STOCK] Buchlidian Voltage Proc PCB, Euro Panel (CVP)

The reason I picked the LT1013 in the first place was its temperature stability... that suited my goal of making this thing a good offset/slew module for working with VCOs. I suppose I'm just assuming the same holds true for the SOIC version of the chip.

Either way, too late now. :hihi:
by negativspace
Tue Jan 21, 2020 2:15 pm
Forum: Music Tech DIY
Topic: [IN STOCK] Buchlidian Voltage Proc PCB, Euro Panel (CVP)
Replies: 1027
Views: 78863

Re: [IN STOCK] Buchlidian Voltage Proc PCB, Euro Panel (CVP)

So it's been a long time with no news here, nothing unusual for a mature product... but time marches on, and this time it's claimed the through-hole LT1013 chip which is now obsolete. Those of you who still have these to build, don't worry, you can still source them on eBay. But I'm out of the PCBs ...
by negativspace
Sun Dec 15, 2019 2:23 am
Forum: Music Tech DIY
Topic: E.A.S. "miss10" HADSR PCB [SOLD OUT]
Replies: 98
Views: 17720

My panel should work with any version of the PCB, although it looks like I only have v2s in my personal build so I can't confirm. (But I can't think of any reason offhand.)
by negativspace
Wed Nov 20, 2019 3:00 am
Forum: Music Tech DIY
Topic: [IN STOCK] E.A.S. "miss 10" LFO/Noise/S&H v2.0
Replies: 84
Views: 8097

The schematic I have does show a 3906 for TR13. Clearly not correct, but probably related to how it got lodged in your brain.

Love Naples - we were there for a couple nights too. Climbed Vesuvius, explored Pompeii, took a day on Capri... Good times. 8-)
by negativspace
Tue Nov 19, 2019 9:19 pm
Forum: Music Tech DIY
Topic: [IN STOCK] E.A.S. "miss 10" LFO/Noise/S&H v2.0
Replies: 84
Views: 8097

Cheers Mike, thanks for the quick answer. Went ahead and put in a socket for Q1, tried any combination of pin orientations for both a 3904 and 3906. Still nothing... I injected an external noise signal into the opamp input and got both white and pink noise at the output, so whatever's happening seem...
by negativspace
Tue Nov 19, 2019 3:50 pm
Forum: Music Tech DIY
Topic: [IN STOCK] E.A.S. "miss 10" LFO/Noise/S&H v2.0
Replies: 84
Views: 8097

So a bit of a puzzler... I'm building one of these for a client, everything is together and working except for the noise section. It's completely dead. I've checked over component placement & the BOM 5 times now, I've replaced the chip and both 3904s, probed every pad to make sure the board isn't fl...
by negativspace
Thu Jan 03, 2019 10:30 pm
Forum: Music Tech DIY
Topic: [IN STOCK] Manual Voltage Processor - 16hp of Euro utility
Replies: 354
Views: 40060

And, good news - these are back in stock and available. Built a tester, new run of boards is working perfectly. :tu:
by negativspace
Thu Jan 03, 2019 9:31 am
Forum: Eurorack Modules
Topic: New Manhattan Analog - the Manual Voltage Processor (MVP)
Replies: 28
Views: 5283

Oof, missed this question and it's clearly way too late now... but the answer is no, everything is set up to max out at unity gain. It's not too difficult to change out some resistors and add some positive amplification, a bit more delicate with the SMT version than the older through-hole one, but n...
by negativspace
Tue Nov 20, 2018 11:04 pm
Forum: Music Tech DIY
Topic: [BUILD] Manhattan Analog Discrete Transistor Amplifier (DTA)
Replies: 23
Views: 3408

Yep, as Seaweed Sound says, the 1nF film cap is a typo on the PCB. It should be a 1uF cap. (I know he said 100nF, but I mis-typed my explanation to him in the email so that is also my fault.) Eventually I'll sort out where and how many zeroes this all needs. :deadbanana: That aside, though, everythi...
by negativspace
Fri Oct 26, 2018 5:42 pm
Forum: General Gear
Topic: The Roland TR707 isn't a classic
Replies: 70
Views: 3318

I'm with you... had one alongside a 606, 808 and 909 back when normal people could afford to do shit like that, and it was quite plainly inferior on just about every conceivable level. That being said, none of it has bearing on whether or not it's becoming "classic." Things that become popular frequ...
by negativspace
Thu Oct 11, 2018 6:04 am
Forum: Music Tech DIY
Topic: [IN STOCK] DTM: Moog CP3-type discrete mixer PCB, Euro panel
Replies: 823
Views: 95775

Yeah, the ROHS silver-finished boards will tarnish after a while. Best storage procedure is to keep them in air-tight sealed containers (tupperware/similar, or even a good zip bag, bonus points for using silica packets) and if they do tarnish, a bit of Tarn-X or your (grandmother's) preferred silver...
by negativspace
Wed Oct 10, 2018 9:13 pm
Forum: Modular Synth General Discussion
Topic: Erthenvar is closed
Replies: 27
Views: 3254

Anyone who owns a Manhattan Analog module owns several bits and pieces supplied by Nick... a real shame to see him throw in the towel. Always a pleasure to work with.

Here's to bigger and better things. :party:
by negativspace
Wed Oct 03, 2018 5:03 am
Forum: Music Tech DIY
Topic: [IN STOCK] DTM: Moog CP3-type discrete mixer PCB, Euro panel
Replies: 823
Views: 95775

These are the ones I use. (Mouser) 623-2743001112LF WHAT!!! SERIOUSLY?? Those are THIRTEEN CENTS EACH!!! And each board needs TWO of them! SHEES!!! I mean, c'mon man! :omg: Kidding aside... you can replace them with very low-value resistors (10 Ohm) or even wire links if the spirit moves you, or if...
by negativspace
Tue Sep 25, 2018 3:56 pm
Forum: Music Tech DIY
Topic: [BUILD] Manhattan Analog Discrete Transistor Amplifier (DTA)
Replies: 23
Views: 3408

[BUILD] Manhattan Analog Discrete Transistor Amplifier (DTA)

It's been brought to my attention recently that I've neglected to post build notes for this one... my bad! Let's fix that. BOM Resistors [2] 8.2R [1] 62R [2] 100R [3] 120R [1] 150R [2] 330R [1] 470R [1] 510R [3] 680R [1] 820R [2] 1k [1] 3.3k [1] 6.8k [1] 33k [1] 47k [1] 150k [1] 270k Capacitors [2] ...
by negativspace
Tue Sep 18, 2018 5:16 pm
Forum: Music Tech DIY
Topic: I built a whole new "B" board for my Odyssey 2800
Replies: 15
Views: 547

Nicely done! :yay: :yay:
by negativspace
Mon Sep 17, 2018 1:00 pm
Forum: Music Tech DIY
Topic: 100k pots for eurorack
Replies: 9
Views: 403

The picture in your link looks correct but the information below says they're flatted/D-shaft... I'd have to download the datasheet to see which is in error. Can check it out later when I'm not on my phone.
by negativspace
Mon Sep 17, 2018 12:31 am
Forum: Music Tech DIY
Topic: 100k pots for eurorack
Replies: 9
Views: 403

Unless things have changed in recent years, Doepfer modules use 16mm Alpha-style pots (although not actually Alpha pots, based on the half dozen modules I own) with 6mm knurled shafts.
by negativspace
Wed Sep 12, 2018 11:20 am
Forum: Music Tech DIY
Topic: [IN STOCK] Eurorack 4hp THAT2180-based Audio VCA
Replies: 412
Views: 53026

^ Correct.
by negativspace
Tue Sep 04, 2018 8:12 am
Forum: Music Tech DIY
Topic: Manhattan Analog 'Mix' - Build Thread
Replies: 98
Views: 11652

The 2 upper holes are just a convenience for builders who aren't using my Euro panel. They're a spare ground pad and a tap into the input summing node if you want to add extra channels.

The beads I use are Mouser #623-2743001112LF. The fuses you want are #652-MF-R005-0.
by negativspace
Tue Sep 04, 2018 8:04 am
Forum: Music Tech DIY
Topic: [IN STOCK] Eurorack 4hp THAT2180-based Audio VCA
Replies: 412
Views: 53026

Unfortunately I can't find SMT tempcos anymore, really... as for whether or not a ~3900ppm part is better than a 50-100ppm standard resistor, I'd guess so but it's just a guess. I'm down to a couple of the tempcos, I need to work out an alternative myself. I am not sure of my BOM, I took that of "Ma...
by negativspace
Thu Aug 30, 2018 6:03 pm
Forum: Music Tech DIY
Topic: [IN STOCK] Eurorack: Discrete State-Variable VCF v1.4
Replies: 1268
Views: 94210

I don't think I've posted one with designators... made up a quick PDF for you, though.
by negativspace
Wed Aug 22, 2018 2:35 pm
Forum: Eurorack Modules
Topic: Note to manufacturers - a word about the ribbon cable
Replies: 33
Views: 1519

If the strain relief portion of a connector is causing issues with module fitment, simply remove it. It pops right off. Should save you 4-5mm.
by negativspace
Mon Aug 20, 2018 3:28 pm
Forum: Music Tech DIY
Topic: How do avoid small specks of solder ruining everything
Replies: 18
Views: 705

Having built around a million dollars worth of gear with the 245/331 combo in the last few years, I recommend it highly. It's rare for me to have any solder-related issues of any kind and it's easy stuff to work with. Pretty consistent.
by negativspace
Sat Aug 11, 2018 6:57 pm
Forum: Music Tech DIY
Topic: [IN STOCK] Buchlidian Voltage Proc PCB, Euro Panel (CVP)
Replies: 1027
Views: 78863

Every now and then I get a board with a bridge to ground under the solder mask. It's happened less in recent batches than those from 2 or 3 years ago, but it may explain your grounded pads. I can usually find the offending bit of copper with a loupe or magnifying glass, and a quick cut with an xacto...

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