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by devinw1
Mon May 25, 2020 10:38 pm
Forum: Music Tech DIY
Topic: Something new I built - fun with decade counters
Replies: 161
Views: 2808

Re: Something new I built - fun with decade counters

More progress. Slowly but surely! I'm learning a tooooonnnn about coding.

by devinw1
Mon May 25, 2020 2:00 pm
Forum: Music Tech DIY
Topic: The open source Jupiter-8-4-ALL project
Replies: 88
Views: 9452

Re: The open source Jupiter-8-4-ALL project

Whats their website? I've been trying to make out what it says on the box for 10 min now haha but still can't see haha... https://www.247tailorsteel.com there is also another one, with more material options (polished brass pweee!) but significantly slower delivery. https://www.plaatwerk365.nl Is it...
by devinw1
Sun May 24, 2020 12:32 pm
Forum: Music Tech DIY
Topic: Something new I built - fun with decade counters
Replies: 161
Views: 2808

Re: Something new I built - fun with decade counters

KSS wrote:
Sun May 24, 2020 12:51 am
Is that video available some place besides instagram?
Oh does it only show if you have an account or something?
by devinw1
Sat May 23, 2020 9:59 pm
Forum: Music Tech DIY
Topic: The open source Jupiter-8-4-ALL project
Replies: 88
Views: 9452

Re: The open source Jupiter-8-4-ALL project

Nm I see the box. Very surprised they can do that so cheap in the EU. But you saved on shipping that way too. Now to figure out how to finish it eh? It is as if you have these machines connected directly to your pc, bizar. Upload step, click, boom there it is at your doorstep brought by their own s...
by devinw1
Sat May 23, 2020 3:09 pm
Forum: Music Tech DIY
Topic: Something new I built - fun with decade counters
Replies: 161
Views: 2808

Re: Something new I built - fun with decade counters

We have liftoff on presets! Too much fun!:

by devinw1
Sat May 23, 2020 12:10 pm
Forum: Music Tech DIY
Topic: Something new I built - fun with decade counters
Replies: 161
Views: 2808

Re: Something new I built - fun with decade counters

right now I am learning ARM M4 assembler. it is in some ways super complicated. in other ways it is like a C64 or an apple II. I still like it better than programming dsPIC. but it will never be as cheap as dsPIC. it is important to note that M0 M0+ M3 do not have DSP, SIMD, FPU. you need a $5 M4 t...
by devinw1
Sat May 23, 2020 12:06 pm
Forum: Music Tech DIY
Topic: Something new I built - fun with decade counters
Replies: 161
Views: 2808

Re: Something new I built - fun with decade counters

I got lucky today. Paul Schrieber talked about how Eric Brombaugh did all the code for the dsPIC33F that was in the e340 e350 e355 etc.. google turned up Eric's tutorials on building synthesizers with dsPIC33F! http://ebrombaugh.studionebula.com/synth/dsPICfun/index.html Nice! Gonna look thru that ...
by devinw1
Fri May 22, 2020 9:11 pm
Forum: Music Tech DIY
Topic: Something new I built - fun with decade counters
Replies: 161
Views: 2808

Re: Something new I built - fun with decade counters

Today I successfully got full control of the BH2221 to work! I know it sounds small but it's a big victory for me. Starting to feel a lot more comfortable with the ardunio. Tomorrow I'll try to work on some code for hitting a button to scroll thru presets and store one. Weeee! This may not be the fi...
by devinw1
Fri May 22, 2020 2:56 pm
Forum: Music Tech DIY
Topic: Something new I built - fun with decade counters
Replies: 161
Views: 2808

Re: Something new I built - fun with decade counters

Thanks man. That's really not so bad actually. I have a lot to think about here. In the meantime, the BH2221 ADC shows up today so I'm going to try and get some 'duino code talking to it. It's got 12 R-2R ADCs inside it for $2. Since speed doesn't matter here (in parallel, no clocking), this seems l...
by devinw1
Fri May 22, 2020 10:24 am
Forum: Music Tech DIY
Topic: Something new I built - fun with decade counters
Replies: 161
Views: 2808

Re: Something new I built - fun with decade counters

Microchip also have sub $2 dsPIC33EP controllers with 500kHz 12-bit ADC but no DAC but in PDIP-28 package and can be programmed with the same programmer. perfect candidate for a R2R DAC. personally I could not do dsPIC. I tried switching from AVR to dsPIC33F a long time ago when the e340 came out. ...
by devinw1
Thu May 21, 2020 10:00 pm
Forum: Music Tech DIY
Topic: Something new I built - fun with decade counters
Replies: 161
Views: 2808

Re: Something new I built - fun with decade counters

On the cap size, if I look at the datasheet, with 12/-12 supplies and switching 10Vpp wave Ron is about 150Ohms, so my sampling time for analog S&H is about 6us. Given the period of a 10Khz wave divided by 12 slices is 8.3us this seems adequate. Probably wouldn't want to go much bigger, but of cours...
by devinw1
Thu May 21, 2020 9:52 pm
Forum: Music Tech DIY
Topic: Something new I built - fun with decade counters
Replies: 161
Views: 2808

Re: Something new I built - fun with decade counters

Cheap is good, SMT is fine if it is a larger form factor like the MUX506 (TSSOP) since this base design already has a couple SMT parts. Bits, probably 10?.. maybe 8 is good enough. If Arduino isn't an absolute requirement as controller, there are other options. Atmel's $1 SAMD10C in SOIC-14 has a 1...
by devinw1
Thu May 21, 2020 9:50 pm
Forum: Music Tech DIY
Topic: Something new I built - fun with decade counters
Replies: 161
Views: 2808

Re: Something new I built - fun with decade counters

yes, take a look at the datasheets for the mux, and see what Ron is for the voltage rails youre using. then you can do 4*R*C. the 072 leakage seems really high. its 6mV/min for 10pA of leakage on a 0.1uF cap, which would put that 072 at 400pA! thats definitely within max specs, but not at room temp...
by devinw1
Thu May 21, 2020 8:04 pm
Forum: Music Tech DIY
Topic: Something new I built - fun with decade counters
Replies: 161
Views: 2808

Re: Something new I built - fun with decade counters

Thanks for looking at the ADCs as well! I will look into the ADC0820
by devinw1
Thu May 21, 2020 7:59 pm
Forum: Music Tech DIY
Topic: Something new I built - fun with decade counters
Replies: 161
Views: 2808

Re: Something new I built - fun with decade counters

Just went out and took some data for THE GREAT MUX506 S&H SHOWDOWN... :hihi: . Spoiler alet... the op amp makes a huge difference! I used the same cap on all tests (0.01uF Panasonic PP) and took the output of the final S&H and buffered it for the MM probe, just to be safe. Here are the results: TLC6...
by devinw1
Thu May 21, 2020 6:39 pm
Forum: Music Tech DIY
Topic: Something new I built - fun with decade counters
Replies: 161
Views: 2808

Re: Something new I built - fun with decade counters

Cheap is good, SMT is fine if it is a larger form factor like the MUX506 (TSSOP) since this base design already has a couple SMT parts. Bits, probably 10?.. maybe 8 is good enough.
by devinw1
Thu May 21, 2020 5:32 pm
Forum: Music Tech DIY
Topic: Something new I built - fun with decade counters
Replies: 161
Views: 2808

Re: Something new I built - fun with decade counters

Do you have any suggestions for ADCs to look at that might suit this? TLC0820?
by devinw1
Thu May 21, 2020 4:47 pm
Forum: Music Tech DIY
Topic: Something new I built - fun with decade counters
Replies: 161
Views: 2808

Re: Something new I built - fun with decade counters

I hadn't thought about the ADC throughput of the arduino. The interwebs tells me it is 9615 Hz, so pretty much you could only capture a waveform of a source that is 800Hz or less here. Hmm. Yaah not so great.

Damn.
by devinw1
Thu May 21, 2020 1:52 pm
Forum: Music Tech DIY
Topic: Something new I built - fun with decade counters
Replies: 161
Views: 2808

Re: Something new I built - fun with decade counters

Yeah, that's why I was saying why not just use the $2 12 channel DAC and be done with it. Then the "slow"/cheap/basic ATMEGA328 doesn't need to care about the clock of the analog part at all. It's just providing segment voltages and presets. But, then I guess is that might be a bit overkill? If the ...
by devinw1
Thu May 21, 2020 12:15 pm
Forum: Music Tech DIY
Topic: Something new I built - fun with decade counters
Replies: 161
Views: 2808

Re: Something new I built - fun with decade counters

have you tried swapping the 082 back in just to verify its the opamps and not the capacitor? No, but I will try to do that tonight. Although, based on the fact that the original caps were the same material (supposedly) and the large Ib difference in the 2 op amps, I would be surprised if it was the...
by devinw1
Thu May 21, 2020 10:25 am
Forum: Music Tech DIY
Topic: Something new I built - fun with decade counters
Replies: 161
Views: 2808

Re: Something new I built - fun with decade counters

I tried .01 and .1uF previously. They were Wimas that claimed to be PP. Both leaked though. Obviously the .01uFs faster though. But I would deem both rates kind of unacceptable. I do realize that 0.1uF is kind of big for sampling time for sure. Just thought I would share that the op amp does appear ...
by devinw1
Wed May 20, 2020 9:39 pm
Forum: Music Tech DIY
Topic: Something new I built - fun with decade counters
Replies: 161
Views: 2808

Re: Something new I built - fun with decade counters

In news back on the analog front, I just received some LMC660s and some .1uF PP Panasonic caps and WOW, much much better. I just set a S&H wave on my 3 channel prototype and went and prepared dinner. An hour and 15 minutes later, the wave is in the same place as it was when I started. No noticeable ...
by devinw1
Wed May 20, 2020 5:06 pm
Forum: Music Tech DIY
Topic: The greatest DIY VCA? Alt to Oakley Classic VCA
Replies: 19
Views: 399

Re: The greatest DIY VCA? Alt to Oakley Classic VCA

EATyourGUITAR wrote:
Wed May 20, 2020 8:19 am
I don't know how it compares but you can get a pretty nice quad VCA from L-1 if you trim it yourself.
I have one of these. A very nice piece. Sound and performance is great and it's built like the proverbial brick s**thouse. :tu:
by devinw1
Wed May 20, 2020 3:52 pm
Forum: Music Tech DIY
Topic: do you coat anodised aluminium panels?
Replies: 15
Views: 272

Re: do you coat anodised aluminium panels?

KSS wrote:
Wed May 20, 2020 2:06 pm
I never worked *for* them. I have worked *with* them
I can't ready obviously.

Doh!

Busy day! Sorry! :doh:
by devinw1
Wed May 20, 2020 12:38 pm
Forum: Music Tech DIY
Topic: do you coat anodised aluminium panels?
Replies: 15
Views: 272

Re: do you coat anodised aluminium panels?

My one beef with MP of Cinci is that they shear their panels (like the post above shows), which is fine, but they don't do any hand work after to deburr or anything. When I worked with them they would do -pretty much- whatever level of machining you were willing to pay for. Milled panels instead of...

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