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 Post subject: BTDR-2 Reverb Module - Here we go.
PostPosted: Fri Apr 13, 2012 7:51 am 
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Inspired by gtr2's build at madbean's forum, I decided to try my own hand at crafting a circuit for the BTDR-2 reverb module. This is essentially the smaller version of the big Belton Brick. Quite a bit smaller, actually. I believe gtr2 is working on a 1590A layout for all you masochists.

I plan to do one that will fit in a 125B or 1590B. Board-mounted pots. Two controls: Reverb Level and Damper (high cut).

The module is available in Short, Medium, and Long decay times. I'm currently working with Medium, but I also have a Long module (haha!) that I will test as well. Medium sounds very hall-ish. I think Short would be more like spring.

Anyway, what I've got working now is simple and sounds quite nice. It's approximately 20 passives and a quad op amp. It could be scaled down to a JFET and a dual op amp, but the space savings wouldn't really be that great, and the JFET (buffer) would require additional passives to bias, so it would end up being more complex. Plus VREF wouldn't be buffered, and that might introduce noise. So quad it is!

Here's a shot of it from last night's first test run:

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 Post subject: Re: BTDR-2 Reverb Module - Here we go.
PostPosted: Fri Apr 13, 2012 9:37 am 
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Nice work. I've got half a dozen Beltons. Ooops. Planning to do a bipolar powered reverb for my modular system including voltage control of depth and regen using a LM13700.

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 Post subject: Re: BTDR-2 Reverb Module - Here we go.
PostPosted: Fri Apr 13, 2012 9:44 am 
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Sounds like a cool project, Rick.

I think "phase 2" for me in this project will be to do one with stereo outputs. Of course, it can't really do stereo in, but have two outs is kinda nice sometimes.

Phase 3 is going to be to integrate one of these little guys into my Valve Jr. 8)

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 Post subject: Re: BTDR-2 Reverb Module - Here we go.
PostPosted: Fri Apr 13, 2012 9:47 am 
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Two knobs on a valve jr? Blasphemy! :lol:

Seriously though, I'm digging phase one, two, AND three.

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 Post subject: Re: BTDR-2 Reverb Module - Here we go.
PostPosted: Fri Apr 13, 2012 10:48 am 
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saxoftenest wrote:
Two knobs on a valve jr? Blasphemy! :lol:

There's going to be at least three: Volume, Reverb, and Damper. :wink:

My old VJ had had three knobs and two switches. You can trick one out pretty decent. Spinnin rims!

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 Post subject: Re: BTDR-2 Reverb Module - Here we go.
PostPosted: Mon Apr 16, 2012 5:42 am 
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Excellent! Into all the bi-phases as well :lol:

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 Post subject: Re: BTDR-2 Reverb Module - Here we go.
PostPosted: Mon Apr 16, 2012 11:07 am 
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and circuit boards will be available when?

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 Post subject: Re: BTDR-2 Reverb Module - Here we go.
PostPosted: Mon Apr 16, 2012 11:11 am 
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gtrplaya101 wrote:
and circuit boards will be available when?

good question. I'm working on a layout now. And trying to decide how many features to add. I think I might keep it simple and go with a Reverb mix and tone control and leave it at that.

But I'll post the schematic soon so people can just build one on vero or perf if they want, or someone else could do a PCB layout.

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 Post subject: Re: BTDR-2 Reverb Module - Here we go.
PostPosted: Wed Apr 18, 2012 3:13 am 
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gimmegimmegimme :wink:
If anyone got a good source for the modules in Europe, please let me know :)

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 Post subject: Re: BTDR-2 Reverb Module - Here we go.
PostPosted: Wed Apr 18, 2012 7:07 pm 
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I'm 99% sure this one is good to go. I made some changes on the board that I then re-applied back to the schematic. So unless I goofed up on that, the attached schematic is good.

I've tried this with the Medium and Long decay bricks. The Long can definitely get some cool ambient spacy sounds going on. And with the tone control at min, it's really bright (either brick type). The only difference I can hear is the decay time.

There is some curious modulation in the wet signal. It almost sounds like there is an LFO in there set with the depth really low and speed pretty slow. I swear I can hear it, though. Or maybe the internal VREF is sagging? I don't know, but I'm 99% sure I hear it.

You guys knock yourselves out doing vero layouts and whatnot. I've ordered a couple prototype boards for myself (and for testing). This could be another group buy thing, but I'm not sure people want to drop $18 on a reverb module. Us DIYers are cheap! :lol:


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 Post subject: Re: BTDR-2 Reverb Module - Here we go.
PostPosted: Thu Apr 19, 2012 1:32 am 
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One question F: What is this gap?
Image
IC 4 and 11 right :?:

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 Post subject: Re: BTDR-2 Reverb Module - Here we go.
PostPosted: Thu Apr 19, 2012 3:12 am 
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I would imagine its the Vss and Vdd connections for the TL074.

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 Post subject: Re: BTDR-2 Reverb Module - Here we go.
PostPosted: Thu Apr 19, 2012 7:41 am 
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raulduke wrote:
I would imagine its the Vss and Vdd connections for the TL074.

Yes.

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 Post subject: Re: BTDR-2 Reverb Module - Here we go.
PostPosted: Thu Apr 19, 2012 8:21 am 
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as in pin 4 and 11 :P

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 Post subject: Re: BTDR-2 Reverb Module - Here we go.
PostPosted: Thu Apr 19, 2012 8:27 am 
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Kunfuz wrote:
as in pin 4 and 11 :P

Yes.

In Eagle, most op amps (and other ICs) are setup so that the positive/negative voltage supply pins are separated from the main schematic symbol. This makes it a LOT easier to draw both the main circuit and the power supply sub-circuit.

Use the "Invoke" tool to make the power pins appear. Check out this tutorial and look for the section "Dealing with Hidden Pins (Power and Ground)":

http://myhome.spu.edu/bolding/EE4211/EagleTutorial4.htm

It's for an older version of Eagle, but most of it is still correct.

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 Post subject: Re: BTDR-2 Reverb Module - Here we go.
PostPosted: Thu Apr 19, 2012 11:25 pm 
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Thank you sensai

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 Post subject: Re: BTDR-2 Reverb Module - Here we go.
PostPosted: Thu May 10, 2012 9:48 pm 
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If you do a group buy, I'd definitely be interested.

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