Search found 495 matches

by emmaker
Sun Apr 05, 2020 2:07 pm
Forum: Music Tech DIY
Topic: Problems with my DIY lm13700 VCA
Replies: 37
Views: 410

Re: Problems with my DIY lm13700 VCA

I even have one 2164 chip, but it didn't work anymore, when I tested it a few days ago on my breadboard.. Would like to make a four channel mixer or equalizer (if possible) of it. A future project maybe. Both the 3080/13600/13700 (do not know how robust the 3280 is) and 2164 chips can get fried pre...
by emmaker
Sat Apr 04, 2020 9:07 pm
Forum: Music Tech DIY
Topic: Quick flashing connection question.
Replies: 5
Views: 75

Re: Quick flashing connection question.

Don't know what you're flashing but I would say no. I suggest you do a search on the specific module you are programming and see what others have done. Usually RX/TX is a serial interface (what a lot of people call RS232) and you'll need something like the interface below. Pay attention to the volta...
by emmaker
Sat Apr 04, 2020 6:44 pm
Forum: Music Tech DIY
Topic: Film caps vs MLCC caps?
Replies: 21
Views: 516

Re: Film caps vs MLCC caps?

I haven't had a problem hand-soldering the panasonic smd film caps. I use a bit of loctite g10 on the pad, and heat with my regular soldering iron. Hot air cooks the caps, I find. Regular lead free solder might be a bit hot... Conductive epoxy works a treat, too...I keep some in my field kit, in ca...
by emmaker
Sat Apr 04, 2020 5:12 pm
Forum: Music Tech DIY
Topic: Film caps vs MLCC caps?
Replies: 21
Views: 516

Re: Film caps vs MLCC caps?

I would stick with through-hole ones. The only film capacitors I know about are these. I would not recommend hand soldering these, if you are an expert solderer and have the right tools and solder you can do it. Read the data sheets.

Panasonic Film Caps
by emmaker
Sat Apr 04, 2020 4:40 pm
Forum: Music Tech DIY
Topic: Problems with my DIY lm13700 VCA
Replies: 37
Views: 410

Re: Problems with my DIY lm13700 VCA

I'm a strong believer if it isn't broken don't fix it. So if it works for you then I would call it good. If I were to make come changes I would put a 47pf-100pf capacitor in the output op-amp feedback loop and change the voltage control to use a transistor based voltage to current converter. The cap...
by emmaker
Sat Apr 04, 2020 3:33 pm
Forum: Music Tech DIY
Topic: Film caps vs MLCC caps?
Replies: 21
Views: 516

Re: Film caps vs MLCC caps?

They are different but for audio signals and filters they should be OK to use. A lot of tube amps used mylar caps in the day. I would not use them where accuracy is needed like in VCOs or if you are building a precision filter.
by emmaker
Sat Apr 04, 2020 12:42 pm
Forum: Music Tech DIY
Topic: Problems with my DIY lm13700 VCA
Replies: 37
Views: 410

Re: Problems with my DIY lm13700 VCA

It is working fine now most of the time on both channels with usable pot range, but sometimes it has dropouts on channel B. Sometimes the volume and modulation jumps around a bit and then returns to normal operation, without me touching anything. Do you have any idea? They changed how you attach pi...
by emmaker
Fri Apr 03, 2020 5:24 pm
Forum: Music Tech DIY
Topic: Problems with my DIY lm13700 VCA
Replies: 37
Views: 410

Re: Problems with my DIY lm13700 VCA

Ok figured attachments out.

He's what I would do.

Jay S.
VCA13700.jpg
by emmaker
Fri Apr 03, 2020 5:06 pm
Forum: Music Tech DIY
Topic: Problems with my DIY lm13700 VCA
Replies: 37
Views: 410

Re: Problems with my DIY lm13700 VCA

Good!

Was going to put my take on it but it looks like e can't attach images anymore.

Good luck.
Jay S.
by emmaker
Thu Apr 02, 2020 7:02 pm
Forum: Music Tech DIY
Topic: Phantom Power to +/- 12v.
Replies: 14
Views: 204

Re: Phantom Power to +/- 12v.

Makes no sense. If phantom power is used it is provided by the pre-amp not the mic and the phantom power and pre-amp are AC decoupled via caps. So you'd already have some sort of power supply to power the pre-amp. If it is a condenser that has it's own battery it is probably from 3V-9V (some have mo...
by emmaker
Thu Apr 02, 2020 5:11 pm
Forum: Music Tech DIY
Topic: Problems with my DIY lm13700 VCA
Replies: 37
Views: 410

Re: Problems with my DIY lm13700 VCA

JohnnyBang wrote:
Thu Apr 02, 2020 5:05 pm
I would do a shematic first and post it here. Maybe you could take a look before I solder.
Please do. better to have 'design review' and get it right.
by emmaker
Thu Apr 02, 2020 4:45 pm
Forum: Music Tech DIY
Topic: Film caps vs MLCC caps?
Replies: 21
Views: 516

Re: Film caps vs MLCC caps?

Somewhere I read that if you use a higher voltage MLCC cap than needed it would reduce microphonics but I can't find it. This was for SMD caps too. It was an app note from Kemit, Panasonic or someone else that makes caps. Basically let's say you put it in a 15V circuit, a 25V part would work but if ...
by emmaker
Thu Apr 02, 2020 4:20 pm
Forum: Music Tech DIY
Topic: Problems with my DIY lm13700 VCA
Replies: 37
Views: 410

Re: Problems with my DIY lm13700 VCA

You've hooked up the internal buffer and yet are using an external buffer. As guest wrote I would cut the 5-7 and 12-10 links and tie 10 and 7 to V+. You can remove R16 and R24 too. Remove and jump across R2 and R3, remove R11 and R12 then connect 5 and 12 to the appropriate buffer minus pins. You c...
by emmaker
Wed Apr 01, 2020 4:31 pm
Forum: Music Tech DIY
Topic: Is there a source for tinned cut wire lengths?
Replies: 14
Views: 258

Re: Is there a source for tinned cut wire lengths?

Probably your best bet is to check the surplus houses for stuff manufactures got rid of. Other than that you probably have to have them done someplace as a custom order. Speaking of this a place I worked in the 80's had plastic tubs with bus wire of different gauges and lengths that we used. These w...
by emmaker
Wed Apr 01, 2020 4:05 pm
Forum: Music Tech DIY
Topic: [Project] Turing Machine Mk2
Replies: 460
Views: 43495

Re: [Project] Turing Machine Mk2

I fucked up in step 9 :doh: I soldered a 3x14 pin IC socket into a 4x16 pin spot (4015 to be specific). Are there any chances I can desolder that somehow? All my attempts failed... :help: :help: Don't know what tools you have or your skill level so can't say. But! When ever you want to remove somet...
by emmaker
Mon Mar 30, 2020 5:13 pm
Forum: Music Tech DIY
Topic: Fried mixer bus by patching aux out to euro input module — how?
Replies: 7
Views: 167

Re: Fried mixer bus by patching aux out to euro input module — how?

Does the synth module still work and what type of mixer? Real mixers are pretty robust about plugging the wrong things in places. Main thing I can think of is there is a power/grounding problem that created a large voltage differential between the devices and the mixer couldn't handle that. I'd bet ...
by emmaker
Thu Mar 26, 2020 3:41 pm
Forum: Music Tech DIY
Topic: Buchla DIY for a first timer
Replies: 17
Views: 874

Re: Buchla DIY for a first timer

Yes the temp for your iron seems way to hot. Look up the data sheet for the solder you use.

Looked up Kester 245 no-clean flux and 331 water soluble flux 315-345C/600-650F.

Jay S
by emmaker
Sun Mar 22, 2020 7:17 pm
Forum: Music Software
Topic: How to choose the right PC for Audio Recording and Streaming
Replies: 17
Views: 274

Re: How to choose the right PC for Audio Recording and Streaming

As far as I know there are nowdays gaming pcs that work well for games but not for streaming or at least for not for both - streaming while gaming. Then I saw this video I posted initially where CPU and Realtime Performance is something that need to be distinguished when working with a DAW. I was w...
by emmaker
Wed Mar 18, 2020 4:14 pm
Forum: Music Tech DIY
Topic: Help me troubleshoot DJ Thomas White Lopass Gate
Replies: 42
Views: 675

Re: Help me troubleshoot DJ Thomas White Lopass Gate

Don't know what board rev you have but you might check this out (top post with the PCB bottom). This is a good example of why you shouldn't do plane fill unless you know what you are doing.

LPG PCB Issue.

Good luck.
Jay S.
by emmaker
Mon Mar 16, 2020 6:34 pm
Forum: Music Tech DIY
Topic: Electrosmith Daisy: An Embedded Platform For Music
Replies: 28
Views: 1289

Re: Electrosmith Daisy: An Embedded Platform For Music

# Library Locations LIBDAISY_DIR = $(LIBDAISY)/libdaisy DAISYSP_DIR = ../../ # Core location, and generic Makefile. SYSTEM_FILES_DIR = $(LIBDAISY)/core include $(SYSTEM_FILES_DIR)/Makefile so … my question is do we need to manually update every makefile to change, for example this: DAISYSP_DIR = .....
by emmaker
Fri Mar 06, 2020 4:39 pm
Forum: Music Tech DIY
Topic: Best way to paint/spray aluminium?
Replies: 22
Views: 574

Re: Best way to paint/spray aluminium?

Something came to mind about using lye to prep aluminum.

Lye and aluminum mixed together make hydrogen which is flammable.

Even though this is just a prep procedure and not mixing a bunch of lye and aluminum together might want to do it in a ventilated and non-spark/flame environment.

Jay S.
by emmaker
Wed Mar 04, 2020 5:14 pm
Forum: Music Tech DIY
Topic: Electrosmith Daisy: An Embedded Platform For Music
Replies: 28
Views: 1289

Re: Electrosmith Daisy: An Embedded Platform For Music

Would it be possible to get the Daisy pin outs for us that have backed the project to start thinking about what to do with it?

Thanks
Jay S.
by emmaker
Tue Mar 03, 2020 3:37 pm
Forum: Music Tech DIY
Topic: More LM13700 VCA Debugging
Replies: 21
Views: 402

Re: More LM13700 VCA Debugging

FYI

One of the things about OTAs is they are very easy to fry. I've fried more LM13X00s than anything else.

If you put to much current on the Iabc pins they will fry and it is easy to do probing and shorting things.

So maybe the OTA is fried.

Jay S.
by emmaker
Sun Mar 01, 2020 2:33 pm
Forum: Music Tech DIY
Topic: Is this fixable? First build, turing machine, overheated elements
Replies: 15
Views: 389

Re: Is this fixable? First build, turing machine, overheated elements

Also as another point, I would always recommend leaded solder - thats just my preference but it flows a lot better in general Also make sure to clean off all the flux residue after you have finished soldering - it can become potentially corrosive over time I use some 99% isopropyl alcohol and a sti...
by emmaker
Thu Feb 27, 2020 6:49 pm
Forum: Music Tech DIY
Topic: Electrosmith Daisy: An Embedded Platform For Music
Replies: 28
Views: 1289

Re: Electrosmith Daisy: An Embedded Platform For Music

Is there going to anything other than the Arduino development environment for the PC (Win10 or Linux/Ubuntu) (Eclipse, command line) that supports the libraries to do development in? Thanks Jay S. We don't personally work in eclipse, but there are several workflows that people use to work on these ...

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