Search found 572 matches

by The Real MC
Wed Jan 13, 2021 10:18 am
Forum: General Gear
Topic: Sequential OB6 and P6 get MPE and P5/10 style 'vintage' function
Replies: 40
Views: 1606

Re: Sequential OB6 and P6 get MPE and P5/10 style 'vintage' function

Try it in unison mode. The "vintage" control models old poly analogs where the EG transients and VCF cutoffs are not consistent from voice to voice. Imperfections can be a good thing. They were especially prevalent in the old OB-X. Add variations in VCF EG modulation depth (more noticeable with deep...
by The Real MC
Mon Nov 16, 2020 11:37 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?

Storage 'scope, analog or digital. Not something you can shoehorn on an analog scope.
by The Real MC
Sun Nov 01, 2020 8:26 pm
Forum: Music Tech DIY
Topic: Roland Sh-3A tuning
Replies: 3
Views: 146

Re: Roland Sh-3A tuning

Bad trimpots can make it impossible to calibrate VCOs.
by The Real MC
Fri Oct 30, 2020 11:42 am
Forum: Music Tech DIY
Topic: Understanding suitable transistor and opamp substitutions
Replies: 28
Views: 769

Re: Understanding suitable transistor and opamp substitutions

Can you substitute a 2N2222 for a 2N2222A? Nope! Those suffixes are there for a REASON! Please share a circuit where the 2222 cannot replace 2222A? I built a string of LED drivers on a 15volt rail using 2N2222s. All the 2222s were full on and would not switch off. Changing the circuit from 15 to 5 ...
by The Real MC
Thu Oct 29, 2020 2:29 am
Forum: Music Tech DIY
Topic: Understanding suitable transistor and opamp substitutions
Replies: 28
Views: 769

Re: Understanding suitable transistor and opamp substitutions

There is no single perfect opamp, they all have tradeoffs. TL08x has lower offset errors than TL07x. I use those in CV circuits to minimize drift. TL07x have lower noise so they are optimal for audio circuits. LF35x has even lower offset errors and has a better output stage for driving a capacitive ...
by The Real MC
Wed Oct 28, 2020 10:22 am
Forum: Music Tech DIY
Topic: CEM3310 equivalent circuit
Replies: 31
Views: 11012

Re: CEM3310 equivalent circuit

Share it here.
by The Real MC
Fri Oct 23, 2020 8:07 pm
Forum: Music Tech DIY
Topic: learning electronics through youtube
Replies: 18
Views: 710

Re: learning electronics through youtube

he used P=V^2/R, or P=V*I, both of which are correct, unless I was looking at the wrong thing. He lost me when when he used electron flow, instead of current flow. Don't do that, stick with conventional current flow like everyone else. You have to use P=I^2 times R. The I^2 term is the crucial one,...
by The Real MC
Wed Oct 21, 2020 10:39 pm
Forum: Music Tech DIY
Topic: learning electronics through youtube
Replies: 18
Views: 710

Re: learning electronics through youtube

kdjupdal wrote:
Tue Oct 20, 2020 3:36 pm
Could you give an example of an error in those videos?
Wrong formula for calculating the power through a resistor. There's a reason why the correct one is crucial. They hammered that in our heads during EE 101.

I don't have a comprehensive list, when I saw that one I stopped watching.
by The Real MC
Tue Oct 20, 2020 10:15 am
Forum: Music Tech DIY
Topic: learning electronics through youtube
Replies: 18
Views: 710

Re: learning electronics through youtube

kdjupdal wrote:
Tue Oct 20, 2020 4:08 am
Good videos for learning the basic of electronics:
The Engineering Mindset
And has errors.

As an EE college graduate, I have found there are a lot of internet resources on electronics with errors. Be careful.

Nothing replaces a good EE book.
by The Real MC
Sat Oct 17, 2020 10:57 am
Forum: Music Tech DIY
Topic: Connectors for PCB mount pots mounted on panel?
Replies: 17
Views: 427

Re: Connectors for PCB mount pots mounted on panel?

Bad idea. You're asking for chronic cracked solder joints over time.
by The Real MC
Tue Sep 22, 2020 9:48 pm
Forum: Music Tech DIY
Topic: Questions on the Prophet 5
Replies: 30
Views: 1124

Re: Questions on the Prophet 5

Graham Hinton wrote:
Tue Aug 11, 2020 10:14 am
it was one of the first products to use a Z80 ever.
The Z80-equipped Emu 4060 polyphonic controller preceded the P-5 by a year. In fact, Dave Smith developed the P-5 firmware on Emu's Z80 development system (the P-5 was a co-development effort between Emu and SCI).
by The Real MC
Sun Sep 06, 2020 11:40 pm
Forum: Music Tech DIY
Topic: Explanation of how modules "putting noise on the ground" bus?
Replies: 38
Views: 1743

Re: Explanation of how modules "putting noise on the ground" bus?

This is a pretty good resource on Eurorack power distribution that discusses ground noise GenusMod.com One of the worst sources of digital noise is scanned LED switching - higher currents than most ICs. You have to decouple the supply rail to the LEDs. If that isn't included in the design of a modul...
by The Real MC
Mon Aug 17, 2020 3:09 pm
Forum: Music Tech DIY
Topic: Moog Memorymoog sucessfully cloned
Replies: 221
Views: 11422

Re: Moog Memorymoog sucessfully cloned

Luismarka wrote:
Tue Aug 04, 2020 4:18 pm
Hey guys!
A quick, silly sound example recorded from my prototype Memorymoog. Just fooling around with a few presets, filter, etc.

Cheers!

memorymoog.mp3
As a die-hard Memorymoog owner since 1986, I approve of this project :yay:
by The Real MC
Sun Jul 26, 2020 1:48 pm
Forum: Music Tech DIY
Topic: ARP 1047 SVF
Replies: 10
Views: 708

Re: ARP 1047 SVF

One of the first publications of a SVF design is IEEE 1968 Vol 56 pp 1137-1139 by J. Tow of Bell Labs. While not a complete analysis, it does have brief discussion of the sensitivity of the system. I collected quite a few discussions on SVF analysis, including ElectroNotes. I have yet to see any di...
by The Real MC
Sat Jul 25, 2020 6:30 pm
Forum: Music Tech DIY
Topic: ARP 1047 SVF
Replies: 10
Views: 708

Re: ARP 1047 SVF

To the extent that I understand the phase compensation stuff, I learned the theory from Lee Thomas's paper The Biquad: Part I-Some practical design considerations IEEE Transactions on Circuit Theory ( Volume: 18 , Issue: 3 , May 1971 ) DOI: 10.1109/TCT.1971.1083277 The paper is about the biquad rat...
by The Real MC
Mon Jul 13, 2020 9:42 pm
Forum: Music Tech DIY
Topic: A quick CEM/AS3310 question...
Replies: 3
Views: 214

Re: A quick CEM/AS3310 question...

Yes that is how the 3310 behaves.

Some synths such as the Memorymoog use additional circuitry to implement an unconditional mode, IE it forces the 3310 to go through all the ADSR stages regardless of early release of the key.
by The Real MC
Wed Jun 17, 2020 11:47 am
Forum: Music Tech DIY
Topic: R.I.P. LM3046: byebye affordable temp stabilized VCO's
Replies: 53
Views: 6467

Re: R.I.P. LM3046: byebye affordable temp stabilized VCO's

No I don't... from the convention of the other reissues, I'm guessing it will be faithful to the original. I don't think we'll see a tempco at the substrate level though, unless Rossum has something clever up his sleeve... I wouldn't call the reissues "faithful to the original"... pin swaps, signif...
by The Real MC
Tue Jun 16, 2020 9:41 pm
Forum: Music Tech DIY
Topic: R.I.P. LM3046: byebye affordable temp stabilized VCO's
Replies: 53
Views: 6467

Re: R.I.P. LM3046: byebye affordable temp stabilized VCO's

While the original SSM2030 was not temperature compensated (the tempco resistor was external), it's worth pointing out that the architecture of the 2x30 VCO is identical to the Rossum-designed VCOs in the Emu modulars, and in the Oberheim SEM and OBX. They are very stable in my FVS and OBX. Interes...
by The Real MC
Tue Jun 16, 2020 11:30 am
Forum: Music Tech DIY
Topic: R.I.P. LM3046: byebye affordable temp stabilized VCO's
Replies: 53
Views: 6467

Re: R.I.P. LM3046: byebye affordable temp stabilized VCO's

CEM3340 AS3340 SSI2130 (coming soon) All temperature-compensated VCOs and all active parts. Neil Not to mention using the SSI2164 with a more traditional core. I'm really excited for the 2130 though. :party: While the original SSM2030 was not temperature compensated (the tempco resistor was externa...
by The Real MC
Tue Jun 16, 2020 11:19 am
Forum: Music Tech DIY
Topic: ARP Omni 2 - slide pots?
Replies: 29
Views: 1273

Re: ARP Omni 2 - slide pots?

Temperature regulated soldering irons such as Weller are mandatory for working on ARP synths. Normally I set the iron at 700deg. I tried it at 650deg while working on ARPs and that seems to work well without lifting PCB traces.
by The Real MC
Sun Jun 14, 2020 10:19 am
Forum: Music Tech DIY
Topic: R.I.P. LM3046: byebye affordable temp stabilized VCO's
Replies: 53
Views: 6467

Re: R.I.P. LM3046: byebye affordable temp stabilized VCO's

Thanks @thetwio. I will test these LM3046N parts soon. But I did find one contrarian view that they do not sell fake parts: That review is a half truth. It's easy to say utsource has been in business for 20 years then neglect to mention any change of ownership. Asian companies have been acquiring o...
by The Real MC
Wed Jun 10, 2020 8:56 pm
Forum: Music Tech DIY
Topic: electronotes/musical engineer's handbook/pcc pdfs
Replies: 145
Views: 16098

Re: electronotes/musical engineer's handbook/pcc pdfs

copyright comes from creation, not format conversion. Are you THAT ignorant on copyright law?!? Copyright DOES apply to format conversion. Publishers have won copyright infringement lawsuits against websites who hosted PDFs of printed books. Commercial music copyrights extend across different forma...
by The Real MC
Sun Jun 07, 2020 8:28 pm
Forum: Music Tech DIY
Topic: electronotes/musical engineer's handbook/pcc pdfs
Replies: 145
Views: 16098

Re:

pugix wrote:
Wed Mar 02, 2016 6:37 pm
But I just found out that Bernie put a lot of PDFs online for free. Maybe you already knew.

http://electronotes.netfirms.com/free.htm
Most of the PDFs are not the complete newsletter. That's why I bought the everything set.
by The Real MC
Sat Jun 06, 2020 12:18 am
Forum: Music Tech DIY
Topic: electronotes/musical engineer's handbook/pcc pdfs
Replies: 145
Views: 16098

Re: electronotes/musical engineer's handbook/pcc pdfs

I met Bernie last summer to collect my package (he lives an hour from me). Bernie is not well, and he doesn't have the energy to digitally scan the package. He still ships orders.
by The Real MC
Wed May 27, 2020 7:48 pm
Forum: Music Tech DIY
Topic: LABVIEW free community edition
Replies: 5
Views: 410

Re: LABVIEW free community edition

Windows only. Too bad they don't offer it for MacOS.

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