Grind Customs FX Tenebrion

 The Tenebrion was designed by CultureJam and is the further development of the Box of Hall reverb. It uses the Belton BTDR-2 reverb brick, which I've designed to fit on the solder-side of the circuit board. You should be able to squeeze it into a 1590B.

Sentinel

The Sentinel is a PT2399-based pitch modulator, delay, reverb and drone verb designed by Arnoud Philip (~arph) as part of the DIYSB 10th Anniversary design contest. It's based on the Sewer Pipes ring-verb and the Noise Ensemble. Original thread here, schematic here. Should be able to squeeze it into a 1590B. 

Note: LED2 in the layout is a bi-color LED that could be used externally as a rate indicator or even the on/off indicator. For the later, use the footswitch to break/connect the connection between the common cathode (middle lead) and the 1k resistor going to ground at the top of the board. Also, the 25k trimmer is a fine tune control for the Drone pot.

DeadAstronaut Chasm Reverb

Been a while since I did a reverb layout and this DeadAstronaut design does not disappoint. It's not a true-bypass effect, but uses some JFET switching so that tails are present when you turn the effect off. Coda Effects actually has a really good write up on the design. Ended up doing this one in Eagle and was able to squeeze it into a 125B. If you want a fabricated board, you can order some off OshPark.

Here's the build doc with the BOM, schematic, and drill template.

All-Star Reverb

Found this one over on FSB. It was designed by Induction and takes elements from the GGG D-Verb, BYOC 2-Knob, and CultureJam's Box of Hall. Like those designs it uses a Belton BTDR-2 reverb brick, which can be mounted directly to the board from the solder-side. If you want a wetter sound, replace the marked resistors with the values listed in the layout below. You may be able to fit it in a 1590B, but I'd go with a 125B. Here's the thread of FSB for reference.

Valve Wizard Equinox II

Here's a reverb circuit that doesn't require a Belton brick–the Equinox II by Valve Wizard. It uses 2, PT2399 delay chips with a pretty standard input/output buffer built around a TL072. The original uses a J112 for switching the tails function, but I've simplified that with a just DPDT footswitch. Use one side of the DPDT for turning the reverb on/off, and the other side for LED indication. If you don't want/need tails with your reverb, just jumper the 2 switch pads. It's gonna be a snug fit in a 1590B, but it will fit.

I was able to verify this over the weekend and it works great and will fit nicely in a 1590B.

CultureJam Box of Hall

Here's a great sounding reverb designed by CultureJam, built around the typical Belton BTDR-2 reverb brick. I've laid it out for onboard pots and the BTDR-2 being mounted from the solder-side of the board.

Wampler Faux Spring Reverb

The Faux Spring Reverb, like many pedal reverbs is based around a Belton reverb module. Originally it used the BTDR-1 (which is massive), but in this layout I've adapted it for the newer and smaller BTDR-2H. I've also simplified the power section a little, and used a TL071 for the second IC. In the original a TL072 was used, but only used half of it. Here's what Brian has to say about his design:

The great thing about the Faux Spring Reverb is that it retains the Analog base tone, doesn’t send your signal through digital/analog converters and back again (wrecking your tone completely) allowing you to be as springy as you like without your sound becoming lifeless, dull and… well, bad. With the tone control, you can control your sound completely and have your reverb be as bright as day, or dark as night… As lively and bright as a small hall, or as deep as the biggest cathedrals.

Edit: I realized this afternoon that the Depth pot would hit the Belton brick, so I've changed it to a 9mm pot and it will clear the brick. The whole thing will be really snug, but it should be doable.

BYOC Reverb 2

Got a request to make a layout for this schematic, and it turns out it's the BYOC Reverb 2. You can use 9mm pots and board mount them from the component side if you like. There are a few jumpers, though one of them (the one by the lower IC) can be eliminated if you just stretch out that 22k resistor. Also, the electrolytic caps are folded down on their side so things will fit with board mounted 9mm pots. The Belton BTDR-2H can also be board mounted from the solder side. Don't feel like making the board yourself? You can buy a PCB or a complete kit from BYOC.

Death by Audio Reverberation Machine

Here's a cool dirty reverb effect by Death by Audio. It uses a Belton brick like many other designs, and offers clean reverb with the gain control turned all the way down. But when you increase the gain, fuzz is infused to the signal. You can mount the Belton brick to the board from the solder-side (best to do this once the rest of the board has been populated). It'll probably be too tall with the brick to fit in a 1590B, but a 125B should work just fine.

Sewer Pipes Ring-Verb

Here's a cool PT2399-based circuit designed by David Edgar (DIYSB member Earthscum). He describes it as, "kind of like playing in a sewer tunnel..." Here's a link to the original schematic and discussion over on DIYSB.

I noticed the schematic image in the DIYSB thread is now broken, so I've drawn up a new one for reference here.

Ersatz Verben

The Ersatz Verben is a pseudo-reverb circuit using a PT2399 for short slapback delay. It was designed by FSB member CultureJam and refined by EarthTones, and based on the Crap-Fi Delay by Allesz. Delay time ranges from 40-140ms. I've laid it out for onboard pots and added polarity protection and an onboard LED resistor. Here's a demo:

EarthQuaker Devices Ghost Echo

The Ghost Echo is a nice little reverb unit, and uses the Belton BTDR-2H-L digital reverb module, as well as a PT2399. I'm not going to lie, this layout gave me some issues (at one point it made DIYLC crash). Even had to use a jumper (which annoys the heck out of me, as you may have picked up on). You won't be able to squeeze it into a 1590B, but a 125B should be a good fit. The Belton brick can be mounted directly to the board from the solder-side.

Here's what EQD's website says about the effect:

Vintage spring reverb emulation capable of providing a little atmosphere all the way through to vast depths in one tiny box. The attack control sets the delay of the initial pick attack on the wet signal only. When playing staccato this registers as a slap back type echo hitting the reverb but when playing fluid lines it adds a massive depth and “fattens” up the sound. The dwell control is a fine tune function that enhances the decay and the depth controls the intensity of the reverb.

Update: If you're having a hard time getting unity volume, try replacing the 10k resistor of pin 9 of the TL074 just above the 2.2uF cap with a 17k resistor (or something close to that).

MOD The Verb Deluxe

Here's another MOD effect. It's a simple reverb using the Belton Digi-Log Mini Reverb Module (the BTDR-2H-L), which you can mount directly to the board. The DPDT switch referenced in the layout is the on/off stomp switch if anyone is confused by that. Here's the schematic and a sound sample for reference.