Search found 723 matches

by emmaker
Sun Jan 17, 2021 1:45 pm
Forum: Music Tech DIY
Topic: Copper tape - sanity check
Replies: 3
Views: 195

Re: Copper tape - sanity check

I would say unless you live near some form of RF transmitter or have something that generates lots of EMI (radio, tv, radar, bad computers, ...) the copper tape is overkill.

It's always good to have a decent power supply.

Happy soldering.
Jay S.
by emmaker
Sat Jan 16, 2021 1:50 pm
Forum: Artist Discussion
Topic: What are you listening to now?
Replies: 3486
Views: 155753

Re: What are you listening to now?

by emmaker
Thu Jan 14, 2021 7:52 pm
Forum: Music Tech DIY
Topic: Learning to debug Frequency Central XVCO2 build
Replies: 28
Views: 203

Re: Learning to debug Frequency Central XVCO2 build

470pf cap looks burnt too. Don't know if it's the lighting, from a soldering iron or toasted.

Jay S.
by emmaker
Tue Jan 05, 2021 7:59 pm
Forum: Eurorack Modules
Topic: Cosmotronic Thru Zero Complex Oscillator - Teaser
Replies: 52
Views: 1668

Re: Cosmotronic Thru Zero Complex Oscillator - Teaser

260ma off both rails, that seems a lot.

Why, digital?
by emmaker
Tue Jan 05, 2021 7:12 pm
Forum: Music Tech DIY
Topic: (potentially stupid) question about the 4069 VCO
Replies: 4
Views: 97

Re: (potentially stupid) question about the 4069 VCO

guest wrote:
Tue Jan 05, 2021 4:42 pm
yes, anytime there is a capacitor inline with the signal, it will block the DC signal, but let the AC (audio) signal pass. so they can be thought of as AC-coupling or DC-decoupling capacitors.
And it can act as a high pass filter too. Typically the high pass frequency is below the audio range.
by emmaker
Tue Jan 05, 2021 6:59 pm
Forum: General Gear
Topic: Sound Sensitive Case LEDs
Replies: 14
Views: 264

Re: Sound Sensitive Case LEDs

waveglider wrote:
Tue Jan 05, 2021 6:45 pm
The module will output the SPI signal to a LED strip, the power for the strip will be external as to not overload your case power.
???

WS2812 don't use SPI but PWM.
by emmaker
Thu Dec 31, 2020 4:51 pm
Forum: Eurorack Modules
Topic: Do you own an oscilloscope?
Replies: 80
Views: 2302

Re: Do you own an oscilloscope?

I bought my first oscilloscope when I was 12 which was an used Eico 55 years ago with money from picking strawberries and beans. I haven't been without an oscilloscope since, currently my go to one (I also have a Heathkit and B&K analog scopes too) is a Rigol DS1054. I have 1000's of hours on scopes...
by emmaker
Tue Dec 29, 2020 3:55 pm
Forum: Music Tech DIY
Topic: [Project] Turing Machine Mk2
Replies: 554
Views: 56225

Re: [Project] Turing Machine Mk2

Thank you for the guidance and great work. The module was built and calibrated, but may have been jumbled in shipping or something. I was able to make the adjustment per your included video and everything appears to be operating as expected. Getting "enough random" at 12 o'clock and drift at around...
by emmaker
Tue Dec 22, 2020 6:26 pm
Forum: General Gear
Topic: transitioning to Apple silicon
Replies: 50
Views: 1359

Re: transitioning to Apple silicon

Would there be and SW developers out there that know what it takes to port from Intel to the M1? Just recompile the apps, OS changes...? Can you cross compile/build apps on an Intel machine for the M1? I have an older (Intel) Mac Mini I was going to use to port some software too. Thanks in advance. ...
by emmaker
Wed Dec 09, 2020 3:04 pm
Forum: Music Tech DIY
Topic: OPL3 127 instruments 4op midi player using STM32 Blue Pill
Replies: 14
Views: 429

Re: OPL3 127 instruments 4op midi player using STM32 Blue Pill

Is there anywhere that sells FM chips anymore that isn't ebay?

Thanks
Jay S
by emmaker
Sat Dec 05, 2020 3:29 pm
Forum: Music Tech DIY
Topic: Help me understand this Electro Harmonix Schematics
Replies: 19
Views: 448

Re: Help me understand this Electro Harmonix Schematics

guest wrote:
Sat Dec 05, 2020 3:07 pm
i would guess that that switch is the one that switches the output from wet/dry signal, and should also go to the led at the top. in which case, you are correct that it should be a push on/off type.
I agree with guest it's probable the wet/dry switch labeled SW by the OUTPUT jack.
by emmaker
Mon Nov 30, 2020 11:15 pm
Forum: Music Tech DIY
Topic: Kassutronics VCA troubleshooting.
Replies: 6
Views: 147

Re: Kassutronics VCA troubleshooting.

1) No. Look at the data sheets.
2) I don't.
by emmaker
Fri Nov 27, 2020 7:11 pm
Forum: Music Tech DIY
Topic: Who said DSP was more stable than analog?
Replies: 20
Views: 648

Re: Who said DSP was more stable than analog?

step letter goes backwards towards A I didn't know this. The ones that I have are revision "Y" and "2". I have no idea which one is newer. One would hope that each revision gets better and better. But knowing how code works that may not be always true. Either the datasheet or errata for the chip wi...
by emmaker
Wed Nov 25, 2020 7:24 pm
Forum: Music Tech DIY
Topic: Are cem3340s exchangeable with the clones
Replies: 10
Views: 464

Re: Are cem3340s exchangeable with the clones

YES

Search Muffs for PWM and frequency issues with the AS3340.

Alfa released a new chip where PWM doesn't effect the chips frequency as much.

Jay S.
by emmaker
Wed Nov 25, 2020 4:42 pm
Forum: Music Tech DIY
Topic: [Project] Turing Machine Mk2
Replies: 554
Views: 56225

Re: [Project] Turing Machine Mk2

Hello, I have a strange issue with my Turing Machine. It is outputting a high voltage on every received clock on the CV OUT . Even when it it not supposed to, when no bit is active. As seen in the video the 4 leds on the right also blink very dim on every received clock pulse. When this happens the...
by emmaker
Tue Nov 24, 2020 4:36 pm
Forum: Music Tech DIY
Topic: stripboard tips and tricks
Replies: 20
Views: 633

Re: stripboard tips and tricks

interesting. i only wish FR4 was cheaper. double the cost of laminated paper at my supplier. have you had any specific issues with moisture? Me, no, but have read about it several places. The type of circuits that this would be critical for I wouldn't do on strip board. Specifically S&H and VCOs, t...
by emmaker
Tue Nov 24, 2020 2:33 pm
Forum: Music Tech DIY
Topic: stripboard tips and tricks
Replies: 20
Views: 633

Re: stripboard tips and tricks

htor wrote:
Tue Nov 24, 2020 2:47 am
do you people use laminated paper or the epoxy variant? are there big benefits from using epoxy material?
Always use FR4/epoxy boards. 'Paper' ones along with the mentioned strength can absorb moisture.
by emmaker
Thu Nov 19, 2020 8:18 pm
Forum: Modular Synth General Discussion
Topic: Anyone using PureData -> modular on Pis/Beagles/etc?
Replies: 12
Views: 421

Re: Anyone using PureData -> modular on Pis/Beagles/etc?

I was looking at this earlier which is Raspberry 3 based and is Open Source.

" Alternate firmware files can be written with Pure Data, Csound, SuperCollider, and even bare-bones C programs."

https://www.qubitelectronix.com/shop/nebulae
by emmaker
Mon Nov 16, 2020 6:25 pm
Forum: Music Tech DIY
Topic: how to view slow-changing signals on analog oscilloscope?
Replies: 11
Views: 314

Re: how to view slow-changing signals on analog oscilloscope?

Mentioned above, use a camera with a long exposure to capture the wave form.

Best solution is get a digital scope with storage and a decent record length.

Tektronix made analog storage scopes and computer terminals using DVSTs (Direct View Storage Tubes) in the 60s and 70s.

Jay S
by emmaker
Fri Nov 13, 2020 2:49 pm
Forum: Music Tech DIY
Topic: VCO with precise tracking in the MHz, for wavetable
Replies: 39
Views: 915

Re: VCO with precise tracking in the MHz, for wavetable

Would any of the frequency synthesizer chips used in rf work here?
by emmaker
Fri Nov 13, 2020 2:08 pm
Forum: Music Tech DIY
Topic: 1u O&C screen issue
Replies: 2
Views: 96

Re: 1u O&C screen issue

Schematic is pretty poor and you have to look at it carefully but yes other GND it all comes from the Teensy.

If you don't have an oscilloscope to look at things ohm out the connections between the Teensy and display. If they look good then try another display.
by emmaker
Thu Nov 12, 2020 5:06 pm
Forum: Fractional Rack Modules
Topic: PAIA 650X, 8700 Assembler/Linker
Replies: 3
Views: 168

Re: PAIA 650X, 8700 Assembler/Linker

The 6502 is one of my favorite machines, along with the Signetics 2650, and the Zilog Z80. What! Someone else knows what a 2650 was! Worked on a products that used the 2650 in the early 80's. It worked fine for the first gen of product but for the second gen it was to under powered so they added a ...
by emmaker
Wed Nov 11, 2020 8:56 pm
Forum: Fractional Rack Modules
Topic: PAIA 650X, 8700 Assembler/Linker
Replies: 3
Views: 168

PAIA 650X, 8700 Assembler/Linker

Would anyone know of a 650X assembler/linker that can assemble/link the PAIA 650X code without changing the code format?

It'd be nice if would be nice if it could produce a binary file too. But I can convert hex to binary if needed.

Thanks in advance.
Jay S.
by emmaker
Wed Nov 11, 2020 4:20 pm
Forum: Music Tech DIY
Topic: Clear film adhesive tape?
Replies: 6
Views: 197

Re: Clear film adhesive tape?

Why not buy some cheap cell phone or tablet film protectors?
by emmaker
Wed Nov 04, 2020 2:30 pm
Forum: Music Tech DIY
Topic: stripboard tips and tricks
Replies: 20
Views: 633

Re: stripboard tips and tricks

I recommend diylc also. You can get creative and make different formats of boards with it too. Here is the noise and comparator section from the Turing Machine V2 on a protoboard format. I also cut and paste the project info together onto one page. NOTE! I have not completely built this so it is unt...

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