Search found 710 matches

by emmaker
Wed Nov 25, 2020 7:24 pm
Forum: Music Tech DIY
Topic: Are cem3340s exchangeable with the clones
Replies: 10
Views: 355

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: 521
Views: 53436

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: 492

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: 492

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: 190

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: 274

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: 814

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: 75

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: 110

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: 110

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: 162

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: 492

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...
by emmaker
Wed Nov 04, 2020 2:16 pm
Forum: Music Tech DIY
Topic: Software or function in the arduino itself for monitoring the code?
Replies: 14
Views: 297

Re: Software or function in the arduino itself for monitoring the code?

If I can I put a serial debug port in any embedded system I work on. Also if I can I take a few I/O pins and hook them up to a oscilloscope or logic analyzer and program those to show me what's going on. This helps the issues of the debug process changing the system timing.

Jay S.
by emmaker
Wed Nov 04, 2020 2:11 pm
Forum: Fractional Rack Modules
Topic: update on Blacet kits migration to synthCube
Replies: 21
Views: 422

Re: update on Blacet kits migration to synthCube

I would have no problem with 1% resistors and it makes sense to me to reduce inventory. If the parts are bought in bulk they might even be cheaper.

YES! PLEASE PUT TOGETHER A PART STORE FOR THE BLACET MODULES!

Thanks
Jay S.
by emmaker
Tue Nov 03, 2020 3:58 pm
Forum: Music Tech DIY
Topic: Understanding suitable transistor and opamp substitutions
Replies: 28
Views: 653

Re: Understanding suitable transistor and opamp substitutions

Hijack. It’s sorta like building a sailboat when a speedboat gets you there faster. Speedboats are loud and there are a lot of fumes from that motor. Sounds like you've never been cruising on a SV and had to run the diesel 4-5 days at a time. The smell and vibration get old fast. Why am I not surpri...
by emmaker
Tue Nov 03, 2020 3:41 pm
Forum: Music Tech DIY
Topic: stripboard tips and tricks
Replies: 20
Views: 492

Re: stripboard tips and tricks

Buy good quality FR4 fiberglass boards. On Amazon and ebay there are a lot of cheap strip boards. Most are made from what is called paper/bakelite/phenolic which you want to avoid. These can absorb moisture in humid environments. They will not last as long as FR4 boards and cause problems with criti...
by emmaker
Mon Nov 02, 2020 2:33 pm
Forum: Music Tech DIY
Topic: uO_c 8hp ornament and crime.
Replies: 352
Views: 47078

Re: uO_c 8hp ornament and crime.

.. Thanks! Also I forgot to ask, but is it correct that power can be connected either way(there is no "negative" marking)? It says "Either way" on the PCB... no its a joke. it says that so you have a 50/50 chance of destroying the module. ;) Looking at the schematic I think you can put power in eit...
by emmaker
Sat Oct 31, 2020 6:15 pm
Forum: Music Tech DIY
Topic: Oscilloscopes: Higher Bandwidth or More Channels
Replies: 21
Views: 469

Re: Oscilloscopes: Higher Bandwidth or More Channels

If 5x sampling is all that is required, then I MAY be getting swayed by this guy (its a little more but not astronomically so): https://www.saelig.com/siglent-sdsx-series/sds1104x-e.htm?keyword_session_id=vt~adwords%7Ckt~sds1104x-e%7Cmt~e%7Cta~346427227572&_vsrefdom=wordstream&gclid=Cj0KCQjwlvT8BRD...
by emmaker
Sat Oct 31, 2020 3:12 pm
Forum: Music Tech DIY
Topic: Oscilloscopes: Higher Bandwidth or More Channels
Replies: 21
Views: 469

Re: Oscilloscopes: Higher Bandwidth or More Channels

Sorry, the “where” in my question I meant was spectrally. You’ll start picking up radio stations in the 80MHz range, and if I understand correctly, you need at least double what you want to measure. The scopes that I'm familiar with (Tektronix) sample 5X their rated bandwidth. So if it's 200 MHz th...
by emmaker
Thu Oct 29, 2020 6:06 pm
Forum: Music Tech DIY
Topic: Understanding suitable transistor and opamp substitutions
Replies: 28
Views: 653

Re: Understanding suitable transistor and opamp substitutions

I thought the same :-) And even harder show me a circuit where a 2222A can't replace a 2222 ! At least for me the CGS Stiener filter (forget which version) 2N2222 and 2N2907 transistors worked way better than the A parts. Jay S Probably because the ones you had happened to be better matched than th...
by emmaker
Thu Oct 29, 2020 3:09 pm
Forum: Music Tech DIY
Topic: Understanding suitable transistor and opamp substitutions
Replies: 28
Views: 653

Re: Understanding suitable transistor and opamp substitutions

MikeDB wrote:
Thu Oct 29, 2020 2:56 pm
I thought the same :-) And even harder show me a circuit where a 2222A can't replace a 2222 !
At least for me the CGS Stiener filter (forget which version) 2N2222 and 2N2907 transistors worked way better than the A parts.

Jay S
by emmaker
Tue Oct 27, 2020 4:46 pm
Forum: Music Tech DIY
Topic: using multimeter as a person with a disability?
Replies: 4
Views: 175

Re: using multimeter as a person with a disability?

Higher end meters should have probes with various clips (aligator, micro, ...) built in that you can buy also.
by emmaker
Fri Oct 23, 2020 4:48 pm
Forum: Modular Synth General Discussion
Topic: Is CMOS still analog? Best way to call out 'chip' logic vs uP logic?
Replies: 47
Views: 1133

Re: Is CMOS still analog? Best way to call out 'chip' logic vs uP logic?

My take is:

Discrete logic: Logic made with transistor, resistors...
Logic: IC based logic, CMOS, TTL, ECL, could go old school here to with RTL and DTL chips too (from the 60s)
Programmable Logic: Computers/uC, FPGA, CPLD, EPROMS, FLASH

Jay S.
by emmaker
Wed Oct 21, 2020 6:35 pm
Forum: Music Tech DIY
Topic: Stackable MTA headers
Replies: 2
Views: 129

Re: Stackable MTA headers

They don't have stackable MTA-156 headers. But they do have feed-through ones so you can have multiple connectors on a cable.

Find a data sheet and check it out.
by emmaker
Tue Oct 20, 2020 2:42 pm
Forum: Music Tech DIY
Topic: [Project] Turing Machine Mk2
Replies: 521
Views: 53436

Re: [Project] Turing Machine Mk2

Ok. After a long while not looking at my TM, I have tried for the last few days to get it to work again. The results are... mixed. I changed a bunch of the IC's and such to make sure I used as much as possible from reputable sources. Right now only the cd4015 and tl431 are from aliexpress (so I gue...

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