GGG has a new reverb kit!

[ppatchmods]

they do make the chip in short, medium, and long reverb. that could have something to do with it. i have the kit and wonder if i can add a pot to adjust the decay(length) of the reverb?

[iaresee]

Nuts. I thought it was going to be digital.

[ppatchmods]

here is the schematic: http://www.smallbearelec.com/Projects/ReverbPedalSchematic.pdf
any thoughts on where to add a pot for decay or length of reverb? you can add a tone pot also but that might be overkill.

[John Lyons]

There are only external connections for in and out as well as power.
You'll have to crack it open and figure out the rest...

john

[iaresee]

Nuts. I thought it was going to be digital.

I'm an idiot - it is digital, but the algorithm is fixed to emulate springs. Oh well...

[iaresee]

here is the schematic: http://www.smallbearelec.com/Projects/ReverbPedalSchematic.pdf
any thoughts on where to add a pot for decay or length of reverb? you can add a tone pot also but that might be overkill.

Decay time is a fixed property of the module. According to the data sheet here:

http://www.smallbearelec.com/Projects/BTDR-1H.pdf

You can buy it with a short, medium or long decay.

[mnordbye]

Anybody know when GGG will start selling the PCBs for this project? Sounds wicked!

[ppatchmods]

they aren't going to sell the pcb's because the circuit is a shared project with another pedal maker

[petemoore]

  5v supply...
  [and 9v for the other amps].
  The only mystery I have is how well will the 5v module accept signal inputs, much hotter than guitar PU's.

[ppatchmods]

I built it up lastnight. very fender-ish. It doesn't sound as thick but it's not tube driven eaither  It is a real nice sounding reverb but i'm no expert. It's not my old '65 gibson ga30rvt or my fender SR but somewhere in the middle.

[Paul Marossy]

I built it up lastnight. very fender-ish. It doesn't sound as thick but it's not tube driven eaither  It is a real nice sounding reverb but i'm no expert. It's not my old '65 gibson ga30rvt or my fender SR but somewhere in the middle.

Hmm.... I might have to get this one. I've been wanting to get a reverb pedal, and a DIY one would be even cooler.

[culturejam]

they aren't going to sell the pcb's because the circuit is a shared project with another pedal maker

Indeed. If you look at the layout PDF at GGG, in the bottom right it says "PCB Artwork Copyright 2009 Hermida Engineering".

It's a Zen-Verb!!! 

[ppatchmods]

yeah. JD worked with the guys over at Hermida on this one. That's why they aren't selling just the pcb's...you have to buy the kit. The pcb has a surface pount part to solder on the back side so it would be hard to etch too. Hey, 65$ was worth it to me. My mazeratti need the verb!

[Kitarist]

anyone tried it yet

[Taylor]

anyone tried it yet

I built it up lastnight. very fender-ish. It doesn't sound as thick but it's not tube driven eaither  It is a real nice sounding reverb but i'm no expert. It's not my old '65 gibson ga30rvt or my fender SR but somewhere in the middle.

[ahermida]

Initially I designed a reverb circuit based on the module for a friend.  The results were very good and he ordered additional units.  I then decided to make a pedal version.  Eventually JD and I discussed the possibility of making a kit based on Brian Neunaber's original design (Brian is the designer of the circuit inside the reverb module itself).  The main idea was to make it accesible to everyone and inexpensive.  

The pcb layout was made so that people could build more or less Brian's original design and experiment with mods.  I selected the 5V regulator as a surface mount to minimize space and keep a low profile.  It is easy to solder.   I normally tend to design very compact but because the board is soldered directly to the reverb module pins I decided to make the board a little larger than I normally do.  

Brian's approach is very interesting.  Most implementations using alternate chips use the built in code (which was normally meant to be just a simple demo) as the final code.  Brian followed a different route.  I don't know if he visits this forum but if he does he could chime in.  

Anyways, those of you that get the kit have fun with it and if you have mods let JD Sleep or myself know.

Alf

[puretube]

...I don't know if he visits this forum but if he does he could chime in.  ...
Alf

Yes...

[Paul Marossy]

I haven't seen one of those reverb bricks before. Very interesting idea...

[brett]

Hi
re: impedance
10k input impedance?  Is that for the chip?  The GGG schematic has 1 Mohm.  Output impedance is a low 600ohms, so you could drive anything with it.

re: 5V reg and signal size.
Pete, you could put a log (volume) pot after the input buffer. Any low value (e.g. 10kA) would do the trick.

This project potentially makes some cheap reverbless amps a lot more attractive (I'm thinking Epi junior head for one).
cheers

[Paul Marossy]

This project potentially makes some cheap reverbless amps a lot more attractive (I'm thinking Epi junior head for one).
cheers

I wonder if you could add it to a tube amp as well? And more importantly, if it would sound any good.