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.

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...

Hopefully you alerted Mouser to the counterfeits.

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...

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...

Storage 'scope, analog or digital. Not something you can shoehorn on an analog scope.

Bad trimpots can make it impossible to calibrate VCOs.

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 ...

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 ...

Share it here.

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,...

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.

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.

Bad idea. You're asking for chronic cracked solder joints over time.

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).

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...

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

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...

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...

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.

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...

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...

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...

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.

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...