Search found 1696 matches

by devinw1
Tue Nov 24, 2020 7:56 pm
Forum: Music Tech DIY
Topic: Another little somthing I've been working on: DR110 inspired 6 voice drum module
Replies: 70
Views: 1991

Re: Another little somthing I've been working on: DR110 inspired 6 voice drum module

Nothing right now but I havent forgotten!! I got excited on some new projects (improved B1 kick/bass module plus a new VCO) and tied up both my breadboards but I want to try and look at additional Cv If possible when I get a chance. In the meantime, 3hands is playing with the prototype and will hope...
by devinw1
Tue Nov 24, 2020 5:07 pm
Forum: Music Tech DIY
Topic: Vintage Arp Odyssey III noise leaks to the output
Replies: 12
Views: 88

Re: Vintage Arp Odyssey III noise leaks to the output

Does the noise cut in loudly at all when you move the noise mixer slider down and up?
by devinw1
Tue Nov 24, 2020 2:26 pm
Forum: Music Tech DIY
Topic: 100k input resistance... isn't
Replies: 57
Views: 1247

Re: 100k input resistance... isn't

Great post, Slightly Nasty. There is a lot of "chasing the dragon" sometimes, which i think is natural for engineer-type people to do. I find myself doing it too. The good part of it is that learning is great. Never stop learning. But, sometimes the perfect analog circuit is not even what people wan...
by devinw1
Tue Nov 24, 2020 2:21 pm
Forum: Music Tech DIY
Topic: What do folks mean by EXPONENTIAL thru-zero?
Replies: 4
Views: 175

Re: What do folks mean by EXPONENTIAL thru-zero?

Cool, thanks guys. That makes sense. I figured there was some loose usage of terminology here (or at least terminology that has yet to settle on a standard definition). I'd be curious to see a schematic of the ZPO for my own gratification. They either are really good at marketing hype, or they are d...
by devinw1
Mon Nov 23, 2020 11:03 pm
Forum: Music Tech DIY
Topic: What do folks mean by EXPONENTIAL thru-zero?
Replies: 4
Views: 175

What do folks mean by EXPONENTIAL thru-zero?

I've seen this a few times advertised, like the SSF Zeropoint and I don't get it. Where I come from, y=e^x looks like this: https://www.google.com/search?client=firefox-b-1-d&q=y%3De%5Ex It approaches an asymptote at zero. It does not cross zero. Furthermore, all exponential generator circuits I've ...
by devinw1
Sat Nov 21, 2020 2:27 pm
Forum: Music Tech DIY
Topic: AD633 vco through zero fm?
Replies: 4
Views: 160

Re: AD633 vco through zero fm?

One thing to think about is that datasheet says that circuit's practical tuning range is only 100:1 , making it not so useful for musical purposes. Also, you have to use 2 $12 chips to build it. If you're interested in using this multiplier to make a linear TZFM vco, IMO, it would be wiser to just u...
by devinw1
Fri Nov 20, 2020 4:12 pm
Forum: Music Tech DIY
Topic: Can anyone share a V2164 / similar LTSpice model?
Replies: 10
Views: 183

Re: Can anyone share a V2164 / similar LTSpice model?

OK, I'm making some progress now. This is my first time importing a text based model and making a symbol. That wasn't too bad. Couple dumb questions: 1) I'm used to OTAs which have a control current not voltage. Looks like this is a control voltage 2) Looks like the voltage in (1) is inverse relati...
by devinw1
Fri Nov 20, 2020 3:09 pm
Forum: Music Tech DIY
Topic: Can anyone share a V2164 / similar LTSpice model?
Replies: 10
Views: 183

Re: Can anyone share a V2164 / similar LTSpice model?

OK, I'm making some progress now. This is my first time importing a text based model and making a symbol. That wasn't too bad. Couple dumb questions: 1) I'm used to OTAs which have a control current not voltage. Looks like this is a control voltage 2) Looks like the voltage in (1) is inverse relatio...
by devinw1
Fri Nov 20, 2020 1:05 pm
Forum: Music Tech DIY
Topic: Level Shifting Circuit Help (teency analog out)
Replies: 3
Views: 68

Re: Level Shifting Circuit Help (teency analog out)

OK, first off, your first amp is not level shifting at all. It's just a non inverting amp with gain of 2. The 100R input resistor and the 100k to ground are doing nothing. The 2nd amp is just another non inverting amp with gain of 6. At that point your signal is clipping hard on the upper end becaus...
by devinw1
Fri Nov 20, 2020 11:29 am
Forum: Music Tech DIY
Topic: Can anyone share a V2164 / similar LTSpice model?
Replies: 10
Views: 183

Re: Can anyone share a V2164 / similar LTSpice model?

Cool, thanks for the links niel and guest. I'll hit up J3rk and see if he will share that model, and I suppose I can try Cool Audio as well for kicks. Neil, yeah I am looking for pretty much #1 on your list. I only use simulation for first pass viability/wrapping my head around a circuit so that's t...
by devinw1
Thu Nov 19, 2020 5:58 pm
Forum: Music Tech DIY
Topic: Can anyone share a V2164 / similar LTSpice model?
Replies: 10
Views: 183

Can anyone share a V2164 / similar LTSpice model?

Google machine is not helping much, nor could I find one in the (used to be Yahoo) LTSpice user group on iogroups.

Any help es mucho appreciado! :hail:
by devinw1
Wed Nov 18, 2020 2:24 pm
Forum: Music Tech DIY
Topic: Aluminum Busbars
Replies: 31
Views: 824

Re: Aluminum Busbars

For aluminum threads that will get a ton of heavy usage, yeah there are 3 things that would help:
1) Thread forming tap
2) Helicoil all the holes
3) Full threaded insert on the holes.

Pick which is easier I guess. All will help a lot.
by devinw1
Tue Nov 17, 2020 11:43 am
Forum: Music Tech DIY
Topic: Recommended high quality eurorack DIY brands
Replies: 24
Views: 649

Re: Recommended high quality eurorack DIY brands

Thank you for the support and good feedback, waldenpotato!
by devinw1
Sat Nov 14, 2020 5:34 pm
Forum: Music Tech DIY
Topic: Look mum no computer VCO with square out and pwm.
Replies: 23
Views: 390

Re: Look mum no computer VCO with square out and pwm.

Yeah If you're going to prototype stuff on a breadboard (you already bought the board right?), You're gonna want a bipolar supply. I'd say get a used Hp unit on ebay or one on the decent options on amazon.
by devinw1
Fri Nov 13, 2020 5:01 pm
Forum: Music Tech DIY
Topic: Look mum no computer VCO with square out and pwm.
Replies: 23
Views: 390

Re: Look mum no computer VCO with square out and pwm.

Yeah, definitely need to make sure you've got +12 and -12. Also, it might be the picture but it looks like you are off 1 hole on providing +12V to pin 1 of the 3340. It looks like you are applying it directly to pin 2 and pin 1 is not connected? I think that might be the way the chip is seated in t...
by devinw1
Fri Nov 13, 2020 3:20 pm
Forum: Music Tech DIY
Topic: Look mum no computer VCO with square out and pwm.
Replies: 23
Views: 390

Re: Look mum no computer VCO with square out and pwm.

Yeah, definitely need to make sure you've got +12 and -12. Also, it might be the picture but it looks like you are off 1 hole on providing +12V to pin 1 of the 3340. It looks like you are applying it directly to pin 2 and pin 1 is not connected?
by devinw1
Fri Nov 13, 2020 1:08 pm
Forum: Eurorack Modules
Topic: Chord oscillator for pad purposes
Replies: 93
Views: 3594

Re: Chord oscillator for pad purposes

That new Instruo thing looks pretty cool too for this type of thing.
by devinw1
Fri Nov 13, 2020 11:29 am
Forum: Music Tech DIY
Topic: Debouncing a Gate Generator
Replies: 4
Views: 206

Re: Debouncing a Gate Generator

That could work, but I guess one of the downsides is that it's kind of a specialized IC that won't be as readily available as something more white-bread from Mouser, digikey etc. You can get pretty darn good hardware debouncing with a couple of CD40106s or 74HC14s and 2 resistors plus a cap per chan...
by devinw1
Fri Nov 13, 2020 11:24 am
Forum: Music Tech DIY
Topic: Schematic drawing styles
Replies: 28
Views: 825

Re: Schematic drawing styles

Yeah I agree. Unfortunately this sort of thing is easy to propogate because packages like KiCAD come with a ton of symbol libraries. Some are nice, with multi-units as they should be, but some are big ugly bricks. But, it takes some time to make a new multi-package symbol, so a lot of the time peop...
by devinw1
Thu Nov 12, 2020 1:42 pm
Forum: Music Tech DIY
Topic: Look mum no computer VCO with square out and pwm.
Replies: 23
Views: 390

Re: LMNC VCO with square out and pwm.

Cool, first thing that is easy to do is just make sure you have proper power on the power pins of all of the ICs.
by devinw1
Thu Nov 12, 2020 1:40 pm
Forum: Music Tech DIY
Topic: Schematic drawing styles
Replies: 28
Views: 825

Re: Schematic drawing styles

Another point worth mentioning: The thing of drawing an IC that contains multiple units, like a quad logic gate, as just a single box with all the pins arranged according to their physical location. In the worst case, the pins aren't even labelled except maybe by pin number. Anyone trying to read t...
by devinw1
Thu Nov 12, 2020 1:37 pm
Forum: Music Tech DIY
Topic: Look mum no computer VCO with square out and pwm.
Replies: 23
Views: 390

Re: LMNC VCO with square out and pwm.

Hi Marcuz. Let's see if the lovely folks here can help you. :) First, what diagnostic tools do you have. Multimeter? Oscilloscope?

2nd, Can you post hi-res pictures of your boards, top and bottom?
by devinw1
Wed Nov 11, 2020 6:35 pm
Forum: Music Tech DIY
Topic: Something New from Doc Sketchy
Replies: 652
Views: 48243

Re: Something New from Doc Sketchy

Dr. Sketch-n-Etch wrote:
Sun Nov 08, 2020 1:52 pm
I'm 98.6% sure that it will work as intended.

LOL! I love your confidence levels!


This sounds like a cool idea. Looking forward to the video as usual! :tu:
by devinw1
Mon Nov 09, 2020 2:46 pm
Forum: Music Tech DIY
Topic: Schmitzbits 7555 ADSR not settling
Replies: 16
Views: 281

Re: Schmitzbits 7555 ADSR not settling

also weird this does not get any mention on Schmitzbits or Yusynth. maybe the choice of transistors is what makes the difference? I don't think Schmitz necessarily tests and vets out his circuits necessarily. I've seen some of them that are pretty loosy-goosy with the descriptions and say stuff lik...
by devinw1
Mon Nov 09, 2020 12:04 pm
Forum: Music Tech DIY
Topic: Schematic drawing styles
Replies: 28
Views: 825

Re: Schematic drawing styles

Good list there KSS. And it's funny you bring up MFOS schematics. Some of those are just an aboslute clusterf**k to try and decypher! And I'll have to say, while I'm a huge fan of the Metric system and generally not such a fan of old antiquated systems carried over from our colonial roots, I think t...

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