Dr Scientist Reverberator

Ice-9 · Post by **Ice-9** » 31 Jan 2011, 20:04

Scruffie wrote:
Ice-9 wrote:
Ice-9 wrote:I have noticed from the pcb picture that Dr. Scientist has used 2 different crystals on the toggle switch to change the sample rate of the digital chip allowing the reverb to have a longer delay (lower fi) 12mhz is the standard xtal and the other is 6mhz .
I would think switching the xtal over while in effect will cause quite a clatter in the sound. I can't think of a better way to do it though. If the wavefront chip has a mute pin it could be done usine that (maybe)
It does indeed Make a Clatter of reverb, you can read it on his site on the Page for the Reverberator.

I've seen several people actually using this noise in recorded tracks though and unless you have your amp up very loud, it's not really too bigger issue, atleast I didn't find it to be, just pop the level back first.

Yes if thats the cas i have to agree. It is the sort of thing i would use as an effect in a recording as some sort of explosion or similar. In a live gig tho ??? (you are loud) I don't mean that as any disrespect to the pedal because like every other thing in life you have to learn how to use it correctly

Scruffie · Post by **Scruffie** » 31 Jan 2011, 20:13

Yeah but mid-song I wouldn't really be flicking a Tiny Toggle anyway, Just roll the guitar volume back quickly before you flick it over for the next song.

It's not the most elegant solution but i'd much rather have the choice and noise then no choice.

Ice-9 · Post by **Ice-9** » 31 Jan 2011, 20:29

Scruffie wrote:Yeah but mid-song I wouldn't really be flicking a Tiny Toggle anyway, Just roll the guitar volume back quickly before you flick it over for the next song.

It's not the most elegant solution but i'd much rather have the choice and noise then no choice.

I agree it can add a nice addition to get a thump when wanted, but i do have to say that i doubt that if you back off your guitar volume it would remove the problem as by switching the xtal probs will add the digital reverb clunk.
As you say though it's not very likely in a live gig anyone would bend over mid song to flick a toggle.

Scruffie · Post by **Scruffie** » 31 Jan 2011, 20:33

Ice-9 wrote:
Scruffie wrote:Yeah but mid-song I wouldn't really be flicking a Tiny Toggle anyway, Just roll the guitar volume back quickly before you flick it over for the next song.

It's not the most elegant solution but i'd much rather have the choice and noise then no choice.
I agree it can add a nice addition to get a thump when wanted, but i do have to say that i doubt that if you back off your guitar volume it would remove the problem as by switching the xtal probs will add the digital reverb clunk.
As you say though it's not very likely in a live gig anyone would bend over mid song to flick a toggle.

Yeah I didn't really think the signal path through there... switch the pedal back off and on again then.

stanimal08 · Post by **stanimal08** » 02 Feb 2011, 18:20

Here are some pics of my excellent Big Box RRR.... the purple wire leads to the Exp Jack i installed into it, not much room but i got it to fit....

mod edit: uploaded the photos as attachments.

culturejam · Post by **culturejam** » 02 Feb 2011, 23:26

ImageShack sucks.

I downloaded them locally and then uploaded them in your post.

teej212 · Post by **teej212** » 03 Feb 2011, 01:47

just out of curiosity, what are those smd chips? one of them looks like the smd pt2399

teej212 · Post by **teej212** » 03 Feb 2011, 01:53

looky here

culturejam · Post by **culturejam** » 03 Feb 2011, 02:39

That looks kinda complicated, but it should be totally doable so long as the Wavefront chips remain available.

teej212 · Post by **teej212** » 03 Feb 2011, 12:04

it looks pretty similar to the RRR. the RRR has tons more diodes though, i think theyre involved with the rotary switching. and it looks like theres a rotary encoder in the femtoverb. same amount of resistors though

Scruffie · Post by **Scruffie** » 03 Feb 2011, 15:35

The Femtoverb was discussed before in a thread about the Reverberator on here... but I can't find it right now.

Scruffie · Post by **Scruffie** » 03 Feb 2011, 15:44

Damn, can't edit, here we go https://www.freestompboxes.org/viewtopic ... erb#p66503

culturejam · Post by **culturejam** » 18 Feb 2011, 18:30

I got mine yesterday (one of the mini versions). It's AWESOME!

Hides-His-Eyes · Post by **Hides-His-Eyes** » 18 Feb 2011, 19:14

what are the different settings?

culturejam · Post by **culturejam** » 18 Feb 2011, 19:38

There are 2 hall settings, 3 room settings, 3 plate settings, and 1 "rotating speaker".

culturejam · Post by **culturejam** » 20 Feb 2011, 21:29

I asked Ryan at Dr. Scientist about some details on the RRR. Here's what he said:

The audio path is quite simple and clean.. input buffer > two inverter stages that feed the +/- inputs of the ADC (the dry side of the MIX pot is taken off the input buffer, no conversion) > reverb engine, DAC > differential amp for the +/- output of the DAC> non-inv op amp booster. It's setup basically the same as Wavefront suggests in their datasheets except for the booster on the end and the filtering of the diff amp.

And here's what he had to say about the new version he has planned:

For the fuller featured version I want to make later this year I've worked out a decay control using this slick little smd square wave oscillator running from 5Mhz to 12Mhz, works great on the bread board. I was hoping to be able to alter some of the patches of the reverb engine and even got myself an old original development board for the reverb engine but it turns out it can only run either all the factory sounds or all new user sounds, but no combination of both, and the code from their patches are un-viewable while you're in the programming mode so you can never see them... it was a plan that went down fast.

modernage · Post by **modernage** » 25 Feb 2011, 05:43

culturejam wrote:I got mine yesterday (one of the mini versions). It's AWESOME!

My goodness. That's a gorgeous pedal CJ. I didn't realize Ryan released new artwork. I definitely support all the good things said about Ryan (can't forget about Tanya!). I've owned 3 of his pedals so far (I'm extremely guilty of getting rid of awesome gear due to GAS), and can't wait to try the rest. I've also corresponded with him via email. A great guy with a loads of integrity in an industry often filled with shady practices.

Even though the Strymon BSR...... I mean the Eventide Space has caught my eye, the new art on the RRminiR may convince me to try to get one to have in the arsenal once again.

culturejam · Post by **culturejam** » 13 Apr 2011, 21:52

I picked Ryan's brain a bit more, and he was very helpful about how this thing works.

Apparently the pre-fab programs on the AL3102 (which is cloned as V1000M by CoolAudio) do not have controllable effect parameters. The Reverberator uses an analog wet/dry mix to control reverb level, and two different crystal oscillators (on a switch) to control sample rate/verb delay time. Also, the 4-bit encoder switch is replaced with a 1P12T and a series of diodes as a replacement for the logic in the encoder, and it selects only the reverb programs. Very clever!