Author Topic: Belton Brick ungooped -- it's what we thought  (Read 12163 times)

culturejam

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Belton Brick ungooped -- it's what we thought
« on: January 07, 2014, 01:03:32 PM »
First reported (in English) on FreeStompBoxes. I didn't see it post here yet, so if I missed the thread, I apologize for the dupes.
http://freestompboxes.org/viewtopic.php?f=20&t=23706

So yeah, it's 3x PT2399 with a gang of passives, a logic gate (or whatever it is), and an op amp. All surface mount.

Not sure if this is the final/verified schematic, but this is pretty close:


jubal81

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Re: Belton Brick ungooped -- it's what we thought
« Reply #1 on: January 07, 2014, 01:42:24 PM »
1. I'm pretty sure I'd rather pay $20 than put all that together.
2. Forget No. 1 when someone makes a layout with adjustable decay.
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culturejam

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Re: Belton Brick ungooped -- it's what we thought
« Reply #2 on: January 07, 2014, 01:59:07 PM »
2. Forget No. 1 when someone makes a layout with adjustable decay.

Even better, assuming that the brick is not super-hard to open up, any parameters should be able to be controlled externally. So you could have the best of both worlds.

Thomas_H

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Re: Belton Brick ungooped -- it's what we thought
« Reply #3 on: January 07, 2014, 02:14:13 PM »
The patent didnt show the values of the parts. Good to have them now.
I wanted to do a version of the brick without the modulation. Now I can :-)

Is this verified?
Soemone successfully breadborded it?
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selfdestroyer

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Re: Belton Brick ungooped -- it's what we thought
« Reply #4 on: January 07, 2014, 02:15:59 PM »
EDIT: Never mind.. I need more coffee....

midwayfair

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Re: Belton Brick ungooped -- it's what we thought
« Reply #5 on: January 07, 2014, 02:52:09 PM »
2. Forget No. 1 when someone makes a layout with adjustable decay.

Even better, assuming that the brick is not super-hard to open up, any parameters should be able to be controlled externally. So you could have the best of both worlds.

Or add Pin 7 LEDs! No more distorted bricks! :D
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Ettore_M

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Re: Belton Brick ungooped -- it's what we thought
« Reply #6 on: January 07, 2014, 02:57:53 PM »
Mother Russia did it again!  ;D

That's pretty awesome! And it can be done with the right PCB design!
It would be nice if someone here did a project (SMD of course) that has the extra mods (the ones Thomas and Jon mentioned, and of course any other mod that could do it better).! ;)

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jkokura

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Re: Belton Brick ungooped -- it's what we thought
« Reply #7 on: January 07, 2014, 02:58:41 PM »
Not surprised here. Wouldn't mind seeing the pics though.

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Thomas_H

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Re: Belton Brick ungooped -- it's what we thought
« Reply #9 on: January 07, 2014, 03:30:59 PM »
Pics are from a BTDR-1
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culturejam

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Re: Belton Brick ungooped -- it's what we thought
« Reply #10 on: January 07, 2014, 03:32:20 PM »
Yes, that's correct.

chromesphere

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Re: Belton Brick ungooped -- it's what we thought
« Reply #11 on: January 07, 2014, 07:12:29 PM »
This is good news!  Looking forward to seeing what you guys come up with.  All sorts of possibilities now. Awesome!
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destro

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Re: Belton Brick ungooped -- it's what we thought
« Reply #12 on: January 07, 2014, 08:58:35 PM »
Did seeing the guts unveil how the modulation is being introduced into the circuit? There has been discussion of whether the short bricks have it verse the long. Would be another nice thing to have control over.

Beedoola

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Re: Belton Brick ungooped -- it's what we thought
« Reply #13 on: January 07, 2014, 10:36:20 PM »
The patent didnt show the values of the parts. Good to have them now.
I wanted to do a version of the brick without the modulation. Now I can :-)

Is this verified?
Soemone successfully breadborded it?

yes!!! I've been wanting that too!!!

culturejam

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Re: Belton Brick ungooped -- it's what we thought
« Reply #14 on: January 07, 2014, 11:00:15 PM »
Did seeing the guts unveil how the modulation is being introduced into the circuit? There has been discussion of whether the short bricks have it verse the long. Would be another nice thing to have control over.

As was mentioned a few posts up, the larger older brick is the one that was degooped. That one doesn't seem to have nearly the same level of modulation as the newer smaller bricks.

Check out this hand-drawn trace from the same Russian thread:
http://i.imgur.com/9lfFsu8.jpg

The interesting thing (to me) is the single Schmitt Trigger connected pins 13/14 on the middle PT2399 (but not the others). I haven't really had a deep look at the whole schematic, but it would seem that Schmitt is set up as a dead-simple relaxation oscillator that is (maybe?) filtered by the internal op amp on pins 13/14, which is then used to oscillate pin 6 (delay time). Not exactly sure yet how it all works together, but it will be something fun to chew on for a while.

That alone is a really cool thing to explore. But I would be careful in proceeding with that because the circuit is covered under a real-deal patent.  :o :'( ;D
« Last Edit: January 07, 2014, 11:02:39 PM by culturejam »