DSM & Humboldt Simplifier

Post by **Saruman** » 31 May 2022, 12:22

Hi! I have an interesting device. I started working on drawing his schematic. Everything is clear. Give me time and I'll draw a diagram. If someone already has a scheme, we will cooperate.

Post by **Saruman** » 02 Jun 2022, 10:15

smanq · Post by **smanq** » 23 Jun 2022, 12:43

Any news?
Looking at the posted image, I've completed presence & resonance stage with component values. I've also slightly redrawn the left part of the tube switching: when the 2 switches are open, the EL34 is selected.

Post by **Saruman** » 23 Jun 2022, 13:17

I removed each capacitor from the board and measured it. The headphone amplifier is made on MAX9722 and is not of interest. The balanced outputs scheme is standard.

temol · Post by **temol** » 24 Jun 2022, 10:42

Some screenshots from the ltspice simulation. All the switches in the middle position. Gain pot - 250k, mic position 50k, presence and resonance @ 1/2.

All of the above in a single view.

jhergonz · Post by **jhergonz** » 25 Jun 2022, 16:14

can someone reupload the photos? seems like they're broken.

TheKoala · Post by **TheKoala** » Yesterday, 08:52

Do we know for sure that Ly-Rock's simplifier is the same as the original ?
I mean, it wouldn't be a surprise but maybe there are differences ?

Post by **Saruman** » Yesterday, 09:08

Hi! I don't have the original, it is very expensive in Russia. But this device shows the basic meaning of the scheme. I modified the circuit for my needs by adding a more detailed simulation of the speakers and replaced the preamp. Many of the ideas of the schematic are original and proved to be very useful.

My dream is to draw a schematic of "origin effects revivaldrive compact", but this device costs even more, and copies are not being made yet.

temol · Post by **temol** » Yesterday, 12:00

Saruman - what modifications did you incorporate into a speaker sim?

What's after the 250p cap? Balanced output?

Post by **Saruman** » Yesterday, 12:25

What's after the 250p cap? Balanced output? - YES!

What modifications did you incorporate into a speaker sim? - Exact imitation JENSEN C 12 N-16 and 4x12 Celestion Vintage 30

Dsmnoisemaker · Post by **Dsmnoisemaker** » Today, 01:17

The ly rock is a ripoff of the first batch.
I have changed a lot of stuff since then, but the structure is mostly the same.

TheKoala · Post by **TheKoala** » Today, 06:30

Hi DSM, seeing a reply from you even "confirming" the copy is sad indeed ! Hopefully, this won't affect business much. Your pedal is an incredible and very pratical piece of gear !
Do you have any idea where they got the schematics and layout ? I have a Walrus Julianna clone of theirs, wanted to see how it was built, the layout looks like an exact copy of Walrus's. Obviously they could've just recreated it by reproducing the same exact layout, but I'm also thinkingna PCB manufacturer may have leaked it.