Wampler - Faux Spring Reverb

Beedoola · Post by **Beedoola** » 13 Jan 2014, 03:45

indyguitarist wrote:
Beedoola wrote:I think I fixed the output...
Look at the application circuit on page 3 of this pdf:
https://www.smallbearelec.com/Projects/BTDR-1H.pdf

hint: Notice the last opamp stage. That can be turned into a low pass filter very easily.

You are close, but still not there.

I appreciate the hint but I'm very noobish and I can't figure anything out from the Belton PDF. Perhaps someone more savvy than myself can figure it out.

biliousfrog · Post by **biliousfrog** » 13 Jan 2014, 08:22

indyguitarist wrote:
Beedoola wrote:I think I fixed the output...
Look at the application circuit on page 3 of this pdf:
https://www.smallbearelec.com/Projects/BTDR-1H.pdf

hint: Notice the last opamp stage. That can be turned into a low pass filter very easily.

You are close, but still not there.

It has been said numerous times before but: Brian, you really are a gent. Many lesser designers/builders would have been upset that their pedals were being de-constructed, yet you're offering gentle encouragement like a primary school teacher.

indyguitarist · Post by **indyguitarist** » 13 Jan 2014, 15:53

biliousfrog wrote:
indyguitarist wrote:
Beedoola wrote:I think I fixed the output...
Look at the application circuit on page 3 of this pdf:
https://www.smallbearelec.com/Projects/BTDR-1H.pdf

hint: Notice the last opamp stage. That can be turned into a low pass filter very easily.

You are close, but still not there.
It has been said numerous times before but: Brian, you really are a gent. Many lesser designers/builders would have been upset that their pedals were being de-constructed, yet you're offering gentle encouragement like a primary school teacher.

Thank you, I appreciate that

Beedoola · Post by **Beedoola** » 20 Jan 2014, 00:51

I breadboarded the circuit and it sounds great but I still can't figure what Brian from Wampler is talking about.

indyguitarist · Post by **indyguitarist** » 20 Jan 2014, 03:17

Beedoola wrote:I breadboarded the circuit and it sounds great but I still can't figure what Brian from Wampler is talking about.

I'm sure it'll work as the schematic posted has it, it's just not the faux spring reverb circuit from us. You need a variable low pass filter on there that's inverting.

mmolteratx · Post by **mmolteratx** » 20 Jan 2014, 04:58

Try the datasheet mixer with the 50k pot in series with the 22n cap in the NFB. I think that's what Brian's saying. See the Deuce Coupe tone control for what I'm talking about.

EDIT: Wait, I forgot I drew this up months ago. Here's the schem.

EDIT2: Holy crap, it's been almost a year. My bad.

Beedoola · Post by **Beedoola** » 21 Jan 2014, 08:46

mmolteratx wrote:Try the datasheet mixer with the 50k pot in series with the 22n cap in the NFB. I think that's what Brian's saying. See the Deuce Coupe tone control for what I'm talking about.

EDIT: Wait, I forgot I drew this up months ago. Here's the schem.

EDIT2: Holy crap, it's been almost a year. My bad.

rad! it works!!

Beedoola · Post by **Beedoola** » 22 Jan 2014, 15:18

The decay on mine is a little shorter, and I'm guessing the brick in the Faux isn't a Short.
Anyone know? The label on the brick is removed...

Blend · Post by **Blend** » 22 Jan 2014, 19:59

you can find the specifications in this site Wampler, "2.8s max reverb time."
R4 in the picture seems to 33k .....?

Mbas974 · Post by **Mbas974** » 22 Jan 2014, 23:54

R4 33K could makes sense, it is a high pass filter with 22n cap.
Working point down to 219hz instead 2.19Khz

Thanks, Blend !

Beedoola · Post by **Beedoola** » 23 Jan 2014, 16:44

Blend wrote:you can find the specifications in this site Wampler, "2.8s max reverb time."
R4 in the picture seems to 33k .....?

Yes, thanks! Good eye. I looked over a pic I took of the PCb and it is a 33k.

And thanks for pointing out the 2.8 seconds on the Wampler site. Problem solved!

Beedoola · Post by **Beedoola** » 08 Feb 2014, 05:27

here are some build shots

fuzzfiend · Post by **fuzzfiend** » 16 Mar 2014, 06:49

Looking at the schematic, what is the benefit of using a J201 on the output of the brick rather than the unused op amp?

gibsonvedran · Post by **gibsonvedran** » 22 Apr 2014, 08:51

I tried the last schematic and I don't think is correct, the depht control does not work as it should, It increase the volume of 'the effect at max setting...it's normal? You have had success with that scheme ?

fretzburner · Post by **fretzburner** » 22 Apr 2014, 10:34

upload img

adult image upload

gibsonvedran · Post by **gibsonvedran** » 22 Apr 2014, 17:56

which is the schematic that you used?

Beedoola · Post by **Beedoola** » 22 Apr 2014, 22:02

fretzburner wrote:[ Image ]
upload img
[ Image ]
adult image upload

Damn, dude. Crazy nice perf work!!

gibsonvedran wrote:which is the schematic that you used?

I'm willing to bet he used the schematic a few posts above provided by MMolterax. Thats what I used as well.

gibsonvedran · Post by **gibsonvedran** » 22 Apr 2014, 22:10

But with that schematic the depth raise the volume of the verb more the length of decay... The decay is the same in all depth settings... Your depth control is ok beedoola?

gibsonvedran · Post by **gibsonvedran** » 22 Apr 2014, 22:17

mmolterax schematic is equal to your schematic Beedoola...
And brian said that your schematic was not correct... "You are close, but still not there."

fretzburner · Post by **fretzburner** » 22 Apr 2014, 23:11

Yes the schematic above is what i'm using (R4 -33k) and sounds fine to me.