Search found 158 matches

by hox3d
Thu Jan 14, 2021 1:54 am
Forum: Music Tech DIY
Topic: The 2021 Show Us Your DIY Builds Thread!
Replies: 39
Views: 1605

Re: The 2021 Show Us Your DIY Builds Thread!

Trying to make use of all my low-gain Soviet MP-26A germaniums, this is a quick stripboard proto of an amp-style germanium drive/preamp pedal. It uses two directly cascaded differential pairs with fixed emitter currents (I feel like diff. pair distortions are really underrated in the pedal world) a...
by hox3d
Sun Jan 03, 2021 9:51 am
Forum: Buchla, EMS & Serge
Topic: Banana system pictures
Replies: 4807
Views: 672475

Re: Banana system pictures

It is not much but it has reached a point where it looks and feels great. I didn't really think this as a 'complete system' as I wanted to build random stuff to get me started. Also, I needed some basic functions going to start developing my own designs/modules. Anyway, here is the current state of ...
by hox3d
Sun Jan 03, 2021 6:11 am
Forum: Music Tech DIY
Topic: The 2021 Show Us Your DIY Builds Thread!
Replies: 39
Views: 1605

Re: The 2021 Show Us Your DIY Builds Thread!

Finally managed to find the motivation to finish this one: a CLee VC timer!
Was a bit annoyed by the amount of wiring it needs, so I waited over 9 months.

But in the end it works well and looks great.
DSC_0026.JPG
DSC_0025.JPG
Gosh, I hate wiring so much.
by hox3d
Mon Dec 21, 2020 5:39 pm
Forum: Music Tech DIY
Topic: The 2020 Show Us Your DIY Builds Thread!
Replies: 519
Views: 45468

Re: The 2020 Show Us Your DIY Builds Thread!

soup wrote:
Mon Dec 21, 2020 3:53 pm
A couple of Ken Stone classics shrunk down for frac...
:rastanana:
Cannot wait to see the whole system with brushed aluminium.
I'm used to the blue, but it does indeed look great like this.
by hox3d
Wed Dec 16, 2020 12:17 pm
Forum: Music Tech DIY
Topic: Driving a 2164 used as panner
Replies: 2
Views: 200

Re: Driving a 2164 used as panner

Thanks for the link!

Well, this seems to be the "proper" way to make a VC-panning.
Since this solution seems to be using as many OpAmp as my linear solution, maybe it is worth a try.
I think this is the circuit CLee used in his VC-panner?
by hox3d
Tue Dec 15, 2020 3:56 pm
Forum: Buchla, EMS & Serge
Topic: [4U/LW] Alan & Friends, a take on the Turing Machine
Replies: 46
Views: 3434

Re: [4U/LW] Alan & Friends, a take on the Turing Machine

Hey there, I am willing to sell some boards in Europe. So those interested, feel free to send me a PM, and we'll see what we can arrange. For people anywhere else (out of Shengen area), sorry! Some well-known DIY store may have it in stock at some point. But I don't want to deal with shipping overse...
by hox3d
Sun Dec 13, 2020 4:58 am
Forum: Music Tech DIY
Topic: Driving a 2164 used as panner
Replies: 2
Views: 200

Driving a 2164 used as panner

Hi there, I was thinking about a cross-panning thingie using 2164 chips. I did this circuit, and even though it should work quite okay, I'm wondering if I can't do it better. I don't know. I feel I'm missing something obvious. The idea is simple: to drive 2164 for panning circuits, you need a voltag...
by hox3d
Thu Dec 10, 2020 2:14 am
Forum: Music Tech DIY
Topic: Transforming a circuit in a current source for LM13700
Replies: 71
Views: 1187

Re: Transforming a circuit in a current source for LM13700

A lot of information all of a sudden.
I think I'll need some time to read (and understand!) all this.

Does anybody here is interested in writing a summary of what has been said here/on another topics?
It would be great to make a paper about scanners, with different approaches, downsides, etc.
by hox3d
Mon Dec 07, 2020 12:40 pm
Forum: Buchla, EMS & Serge
Topic: 4U Panel Colors
Replies: 20
Views: 896

Re: 4U Panel Colors

That's a good question. If I had to start a new system from scratch (well, if I was able to do my own panels) I would probably go for another color. But I think it is not really the color that matters, but rather the general aesthetic (font, pots/bananas etc). And even though there are slight variat...
by hox3d
Mon Dec 07, 2020 12:13 pm
Forum: Music Tech DIY
Topic: Transforming a circuit in a current source for LM13700
Replies: 71
Views: 1187

Re: Transforming a circuit in a current source for LM13700

Thanks.

We've reached a good compromise between complexity/board space/"correctness"...
Well, I'll keep that on the prototype and let you know how it feels/sounds!

Many thanks to everybody, it seems that scanners are a both complex and interesting subject.
A lot of ideas, circuits, etc.
by hox3d
Sun Dec 06, 2020 7:41 am
Forum: Music Tech DIY
Topic: Transforming a circuit in a current source for LM13700
Replies: 71
Views: 1187

Re: Transforming a circuit in a current source for LM13700

I think I'll go with the three-transistor circuit. It seems to work well, and there's a natural tendency to limit current even though the input voltage increases. So it is "self-limiting" in some way. That would make the CV input additional circuitry quite easy to do. The current differences are not...
by hox3d
Sat Dec 05, 2020 5:14 am
Forum: Music Tech DIY
Topic: Transforming a circuit in a current source for LM13700
Replies: 71
Views: 1187

Re: Transforming a circuit in a current source for LM13700

I tried to simulate it but no luck so far: https://tinyurl.com/yxnljcxd I am missing something? The currents need to head to a lower voltage point: -12V would do it and would be more like the control input of a CA3080/LM13700 The CV range should be more like 500mV than 5V -- worth experimenting wit...
by hox3d
Sat Dec 05, 2020 4:58 am
Forum: Music Tech DIY
Topic: Transforming a circuit in a current source for LM13700
Replies: 71
Views: 1187

Re: Transforming a circuit in a current source for LM13700

I tried to simulate it but no luck so far: https://tinyurl.com/yxnljcxd

I am missing something?
by hox3d
Sat Dec 05, 2020 3:51 am
Forum: Music Tech DIY
Topic: Transforming a circuit in a current source for LM13700
Replies: 71
Views: 1187

Re: Transforming a circuit in a current source for LM13700

also, here is the barrie gilbert version: http://www.openmusiclabs.com/files/3scanner.png the values are just rough estimates, if youre interested in pursuing this, i can dial them in a bit more. this has the advantage of being very simple, and dealing with the saturation regions well, but its also...
by hox3d
Fri Dec 04, 2020 1:30 pm
Forum: Music Tech DIY
Topic: Transforming a circuit in a current source for LM13700
Replies: 71
Views: 1187

Re: Transforming a circuit in a current source for LM13700

Thanks for the detailed replies! This is all true! I just wanted to point out that the extra components in that schematic (which is "my" schematic, though this part I learned from Thomas Henry's book on the 3080) are useful when exposing the controls to the outside world. The current amplification a...
by hox3d
Fri Dec 04, 2020 2:26 am
Forum: Music Tech DIY
Topic: Transforming a circuit in a current source for LM13700
Replies: 71
Views: 1187

Transforming a circuit in a current source for LM13700

I have something in my mind and it does not seem that complicated. But... While with voltages I feel fine, there is always tears and pain when current is involved. Anyway, I'm trying to morph between the three outputs of a filter. Basically, we need 3 VCAs, and three voltages (or currents, depending...
by hox3d
Tue Nov 24, 2020 3:03 pm
Forum: Music Tech DIY
Topic: 100k input resistance... isn't
Replies: 89
Views: 2429

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

Maybe in music or musical instruments, at some point, there is no such thing as 'metrics'. What I mean is that traditional metrics, for instance noise, won't give you the best results and/or a result that musically makes no sense. I mean, you could build the least noisy square oscillator in the worl...
by hox3d
Mon Nov 23, 2020 3:33 pm
Forum: Buchla, EMS & Serge
Topic: [4U/LW] Alan & Friends, a take on the Turing Machine
Replies: 46
Views: 3434

Re: [4U/LW] Alan & Friends, a take on the Turing Machine

Ah, that's Outsie.
It's a small utility I made, based on various schematics on the internet.
So nothing crazy.

More info here: viewtopic.php?t=232057.

If you want one, you can see if others are interested and make a batch together!
by hox3d
Sun Nov 22, 2020 11:14 am
Forum: Buchla, EMS & Serge
Topic: [4U/LW] Alan & Friends, a take on the Turing Machine
Replies: 46
Views: 3434

Re: [4U/LW] Alan & Friends, a take on the Turing Machine

They do look nice. But I'd bet they will cost less and-or be easier to manage through mfg and shipping if they were two separate boards. Did you have a reason to snap-ably join them? ... Thanks for the input! Yes, there is no real reason to do it that way. I think I wanted V-cut first, but did not ...
by hox3d
Sat Nov 21, 2020 8:13 am
Forum: Buchla, EMS & Serge
Topic: [4U/LW] Alan & Friends, a take on the Turing Machine
Replies: 46
Views: 3434

Re: [4U/LW] Alan & Friends, a take on the Turing Machine

Hey Wigglers, So it is ready! I tested one PCB from the batch I received, and it works! All previous issues should now be fixed. I'm quite pleased with the result. The build documentation is also ready, I think. I tried to provide as much information as I could (clear schematics with pdf, comprehens...
by hox3d
Tue Nov 17, 2020 4:02 pm
Forum: Modular Synth General Discussion
Topic: A New Format
Replies: 8
Views: 562

Re: A New Format

Will it be DIY?
To which extent is it (even partly) compatible with existing formats?

Can't wait to have more details!
by hox3d
Fri Oct 30, 2020 12:06 pm
Forum: Buchla, EMS & Serge
Topic: Which Banana Jack Do You Prefer and Why?
Replies: 11
Views: 424

Re: Which Banana Jack Do You Prefer and Why?

Cinch are the ones I use, because... Because ;)
No special reason, colors are nice and while they are not cheap, they are not expensive.
I've been looking at an alternative (Schutzinger for instance) but one can hardly beat this quality/price ratio (I think).
by hox3d
Thu Oct 22, 2020 12:54 pm
Forum: Buchla, EMS & Serge
Topic: "Best" Banana Color Scheme for New Format?
Replies: 50
Views: 1591

Re: "Best" Banana Color Scheme for New Format?

Will the format be DIY anyway?
Because if it is, no color rule apply, as you may already guess ;)

I mean that giving some 'tendency' is nice, but people will modify it anyway. In the end, I think it is more about a 'suggested color scheme' rather than a rule...
by hox3d
Mon Oct 19, 2020 11:51 am
Forum: Buchla, EMS & Serge
Topic: Banana system pictures
Replies: 4807
Views: 672475

Re: Banana system pictures

Digging the french name!
by hox3d
Fri Oct 02, 2020 6:05 am
Forum: Buchla, EMS & Serge
Topic: [4U/LW] Alan & Friends, a take on the Turing Machine
Replies: 46
Views: 3434

Re: [4U/LW] Alan & Friends, a take on the Turing Machine

Hey there, sorry for the lack of updates on this. Yes, the bad producer has been my super-secret beta-tester™ for Alan & Friends, so he had a previous version of the board to check if everything was okay with the BOM, etc. And it seems the build went well, which is great! Now, the (hopefully) last v...

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