Author Topic: DIY Reverberation Machine (DBA)  (Read 3159 times)

Addy Bart

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DIY Reverberation Machine (DBA)
« on: November 09, 2016, 06:03:13 PM »
Thanks to m-Kresol for making the boards available at OSHPark. Felix's layout makes use of the newer BTDR-3 bricks that have adjustable decay. I've built this pedal twice now, the first time using the older brick which has a bit more modulation going on. I did tinker around with the resistors in the dry path of the circuit to get more dirt from the gain control.

Here's a quick phone recording from earlier today:




selfdestroyer

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Re: DIY Reverberation Machine (DBA)
« Reply #1 on: November 09, 2016, 08:03:27 PM »
That came out great! Sounds awesome.

Can you share what changes you made for it to get a bit dirtier? I have this built up but have not boxed it up yet since it just doesn't get dirty no matter how hard I push it with my Jazzmaster. I get a bit of grit with my SG humbuckers but I don't use the SG as a primary player.

I would love to get results like yours.

Cody

Addy Bart

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Re: DIY Reverberation Machine (DBA)
« Reply #2 on: November 09, 2016, 08:32:49 PM »
Thanks Cody.
Sure, these are the resistors I changed. Refer to the schematic in the build doc at OSHPark (Rubidium Reverb):
R5: 47k (this is the one that gives you more gain in the dry path)
R16: 5k6 (this is for the sunshine part of the reverb)
I tried a B2M pot for the gain but went back to a 1M log pot. Seems a bit more useful to me.
I used a TL074 instead of the more obscure TLC27... I started out with the latter but I couldn't hear any difference between them, and as I'm selling this build, opted for the op amp that's easier to find.
Hope this helps :-)

selfdestroyer

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Re: DIY Reverberation Machine (DBA)
« Reply #3 on: November 09, 2016, 09:23:49 PM »
Thanks Cody.
Sure, these are the resistors I changed. Refer to the schematic in the build doc at OSHPark (Rubidium Reverb):
R5: 47k (this is the one that gives you more gain in the dry path)
R16: 5k6 (this is for the sunshine part of the reverb)
I tried a B2M pot for the gain but went back to a 1M log pot. Seems a bit more useful to me.
I used a TL074 instead of the more obscure TLC27... I started out with the latter but I couldn't hear any difference between them, and as I'm selling this build, opted for the op amp that's easier to find.
Hope this helps :-)

Thanks a lot for taking the time to explain that. Really appreciate it. Now lets see if I can get to the bench tonight.

Cody

Boba7

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Re: DIY Reverberation Machine (DBA)
« Reply #4 on: November 10, 2016, 01:02:51 AM »
Sounds like a great circuit, and a nice pedal ! Do you have a gut pic? :)

m-Kresol

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Re: DIY Reverberation Machine (DBA)
« Reply #5 on: November 10, 2016, 02:24:17 AM »
Hi addy,

great build and great demo. Is it cool if I implement a link to your demo in the build doc?
Do you plan on doing any graphics? and of course, I demand a gut shot too ;)

Cody, I'll go over the part values again today to see if BOM and schematic values match up. I've built two of these now and they sounded identical and I thought that they could be quite dirty, but maybe that's just my taste/opinion, idk.
I build pedals to hide my lousy playing.

My projects are labeled Quantum Effects. My shared OSH park projects: https://oshpark.com/profiles/m-Kresol
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Addy Bart

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Re: DIY Reverberation Machine (DBA)
« Reply #6 on: November 10, 2016, 04:07:14 AM »
Sure thing Felix :-)
I think this one will be without graphics as it's for a friend and he wants to keep the price down (ha).
Here's a couple of better photos. I still need to solder in the LED!

m-Kresol

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Re: DIY Reverberation Machine (DBA)
« Reply #7 on: November 10, 2016, 04:29:01 AM »
thanks. I updated the doc, also realized that the title was wrong. must have overwritten it while doing the dubnium drive doc.

is this one of the new polished/buffed tayda enclosures or did you do it yourself?
I build pedals to hide my lousy playing.

My projects are labeled Quantum Effects. My shared OSH park projects: https://oshpark.com/profiles/m-Kresol
My build docs
My etching tutorial

Addy Bart

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Re: DIY Reverberation Machine (DBA)
« Reply #8 on: November 10, 2016, 04:45:17 AM »
Well spotted! I tried out the electric buffer that I'd bought for cleaning the plexiglass on the balcony. It was a bit of a rush job but it looks like it works... next time I'll put some proper effort in to getting a nice shine.

KT

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Re: DIY Reverberation Machine (DBA)
« Reply #9 on: June 26, 2018, 07:43:39 AM »
a bit late to the party but I have some problems. I've tested the kresol pcb with two different BTDR-3 bricks and at high decay settings there always is a annoying (reverbed)-hum in the background. With with the older bricks and these PCBs this problem does not occur. 

stringsthings

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Re: DIY Reverberation Machine (DBA)
« Reply #10 on: June 27, 2018, 04:31:11 AM »
Nice build!  The demo sounds great.
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Addy Bart

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Re: DIY Reverberation Machine (DBA)
« Reply #11 on: June 27, 2018, 05:32:31 AM »
Nice build!  The demo sounds great.

Cheers! I made another one a while back. I took out the 470pF cap in the gain part of the circuit, brightening the fuzz.

KT

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Re: DIY Reverberation Machine (DBA)
« Reply #12 on: June 28, 2018, 01:20:30 AM »
and no problems with noise addy bart when using the BTDR-3?

Addy Bart

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Re: DIY Reverberation Machine (DBA)
« Reply #13 on: June 28, 2018, 03:41:05 PM »
and no problems with noise addy bart when using the BTDR-3?

I havenít had the problems you describe. But I used a BTDR-3 that I ordered a long time ago from Small Bear.

Iím not sure what to suggest... maybe contact the vendor to see if this is a common problem with the new bricks. Hope you manage to fix it... those things arenít cheap!

blearyeyes

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Re: DIY Reverberation Machine (DBA)
« Reply #14 on: June 28, 2018, 03:47:34 PM »
That does sound really good! Great pedal.
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