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I still have a Devi Ever Console development kit that I should dig out and dust off. From what I recall, the circuits were much noisier in the cartridge format.

The Console is really what led me to look at eurorack as a pedal format. I'd of loved to had a Console 3 with a few cartridges. It was an awesome idea

Cabintech is good. I would go directly to their site rather than using their ebay store. You will likely come out a little cheaper.

https://cabintechglobal.com/mn3005

I usually get mine from Sythcube but they are out of stock right now.
https://synthcube.com/cart/xvive-mn3005-bbd-clone-ic-14-pin-dip-package

They even have the Panasonics
https://synthcube.com/cart/mn3005-bucket-brigade-delay-analog-ic

The Kemet EA2-5SNJ works for the VFE pedals as well and Mouser has them in stock, plus they are way cheaper too.

https://www.mouser.com/ProductDetail/551-EA2-5SNJ

I think the idea is great. I'd been hoping to see someone do something like this ever since the Devi Ever cartridge thingy that never made it out.

There are however, a couple of questionable choices in this implementation. The width and number of connectors seems fairly excessive. Also, with the cartridge standing up at a 90 degree angle, and so close to the foot switch, those knobs are like to go pretty quickly. I notice the demo he is using his hands to switch rather than his foot

Every laptop power supply I have used for audio has been noisy and somewhat interactive with whatever it was powering.

That board says it will run off 8V so I'd try a one spot just to see if it has anything to do with the power.

Cool jam btw

I have a question about the schematic. What is Q1B doing, just hanging with Q1A?

It's the SMT version. So, you can populate either a through-hole or surface mount JFET. In light of JFETs being so expensive now I pretty much just use surface mount these days unless I have to use the other for some reason.

Yep, I've pretty much decided the same thing. As a matter of fact, I ordered some adapters for the boards that don't already accommodate them.

I don't even bother with the adapter boards. I just add the legs

Super cool.. what all does the Robbie the robot head do?

No, not at all. Is it safe to assume the vcc/2 is the vref at 4.5? I'm slowly learning my way. I'd really like to may a PCB from this. The transistors look like 2n5088s if I'm not mistaken.

Yes, I believe vcc2 is the 4.5v vref

I got that schematic from here. There is some other info that may be useful

https://electric-safari.com/2018/10/05/boss-os-2-overdrive-distortion-mod

And this too
https://www.roboticbeast.com/modification-de-la-boss-os-2/

Nice, I'd like to see more. I've asked around, and the OS2 was not very popular, but I'd like to judge for myself.


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The OS-2 is amazing

Is it possible to build it without it being huge and overly complicated?


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This doesn't look too bad

Not what the title leads you to believe. With the release of the VFE DragonHound coming this week I started thinking a bit about blended circuits. The DragonHound puts the AlphaDog and PaleHorse in one box and lets you blend them in parallel (with the tone and level being shared by both). I've thought about this concept on and off for a few years but never really went anywhere with it. But, the DragonHound sounds great so I want to start tackling some other possibilities.

The two that I've already started drawing up are pretty solid ideas: An OCD and Zendrive (both using mosfet clipping, one hard one soft) and two of my favorite boosters - the AMZ MiniBoost and Mosfet boost. The boost one goes further in that it lets you run them in series (both ways) AND parallel.

Any suggestions on other blender circuits you might like? This could be another category of offerings at mbp.

The DOD FX76 Punkifier is two blended circuits. The FX13 Gonkulator is too

Here are RG's comments on this:

https://www.diystompboxes.com/smfforum/index.php?topic=93431.0

Any schematics for considering? Honestly, don't believe that any resistor in audio path will generate any significant heat...

The RocketEQ schematic is posted above.

My thinking is that resistors in the signal path with no audio would not generate heat, but when playing, the voltage is boosted by the opamps, in this case, potentially up to 18V. So that (i think) could potentially surpass 1/8 watt. The more they warm up the noisier they get... So there may be room for improvement with 1/2watt resistors... maybe?

Since de-rating resistors is said to lower temperatures and thus help noise in any that may be self heating, how do you identify the ones that generate heat?

The VFE production build is using all 1/4 watt resistors so I'm wondering if using 1/2 watt in certain places might help

Don't know your schematics, but try at first power from baterry and compare it with power you use now. Then if you use there 074 try to use JRC4580s.

Last year i used Takman 1/4w metal films for the stepped attenuator i put together for my hifi preamp. Completely happy with the results.

Bought here, they also carry the PRP's, as well as bulk metal films, wire wounds, tantalums, the complete gammit of resistor audio insanity.

https://www.partsconnexion.com/takman-metal-film-rey-series-0-25-watt-resistors.html

Comparing prices with vendors in the UK and USA when i was shopping and they would match if lower but in all cases, for everything i was shopping for they were lowest, that and i can pick up the order.

Thanks. I'll take a look at these

Here is the v4.0 board
and the v4.1 schematic

Are there any certain spots beyond the 4.1 changes to target further noise reduction?