Search found 576 matches

by The Real MC
Thu Jan 21, 2021 7:45 pm
Forum: Music Tech DIY
Topic: Fake TL074 chips in circulation
Replies: 23
Views: 803

Re: Fake TL074 chips in circulation

devinw1 wrote:
Thu Jan 21, 2021 6:20 pm
Should we be worried about 074s and 072s going scarce for some reason?
Far from any danger of going obsolete. It's a VERY popular part.
by The Real MC
Thu Jan 21, 2021 3:15 pm
Forum: General Gear
Topic: Gear you own multiples of.
Replies: 73
Views: 1830

Re: Gear you own multiples of.

I bought a Kurzweil MIDIBoard brand new in 1989. I do a lot of studio work and gigging with it. I bought a second one used eight years ago from eBay because it became too much work to drag it out of the studio. By then a used MB could be had for peanuts. So my #1 stays in the studio and the #2 is de...
by The Real MC
Thu Jan 21, 2021 2:57 pm
Forum: Music Tech DIY
Topic: Fake TL074 chips in circulation
Replies: 23
Views: 803

Re: Fake TL074 chips in circulation

Hopefully you alerted Mouser to the counterfeits.
by The Real MC
Wed Jan 20, 2021 11:48 pm
Forum: General Gear
Topic: Favorite 80s rack mount digital reverb?
Replies: 150
Views: 5361

Re: Favorite 80s rack mount digital reverb?

Eventide 2016 is the reissue of the classic SP2016 of the 1980s. I own three of those. They are great for short room verbs - something about this box lifts the source out of the mix. Works great for synths, percussion, and reverb. Zero menu diving, excellent all knob interface. Samples on my website...
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: 1811

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: 323

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: 188

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: 818

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: 818

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: 37
Views: 11407

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: 721

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: 721

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: 721

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: 467

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: 1191

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: 1814

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: 222
Views: 11996

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: 735

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: 735

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: 227

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: 6754

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: 6754

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: 6754

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: 1321

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: 6754

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...

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