A reverb pedal without Belton brick or FV-1?

[sajy_ho]

Hi guys, It' been a long time since I was planning to build a reverb pedal but none of reverb modules can be found here (Belton brick or FV-1). Can someone name a reverb pedal that I could build without using them?
I've built an Equinox and loved how it sound, but the delay time is very short (I mean the reverb room size!), and also I've tried build a Digital Reverb using BTDR-2 patent and didn't have success. The schematic is below:

Can someone more knowledgeable tell me what could be wrong with the schem?
Thanks
Sajad

[samhay]

I've built an Equinox and loved how it sound, but the delay time is very short (I mean the reverb room size!)

So mod the Equinox to have a longer delay.
You have 2 PT2399s to play with, so vary the resistors to pin 6 of one or both to get the delay you want.

[sajy_ho]

Thanks, but that wouldn't be a REVERB anymore. For a reverb chips must have delay times with clock time relationship. With two of pt2399s it won't be more than Equinox. I'm looking for something more,  maybe three chips.

[knutolai]

There is a schematic for the inside of the belton brick over at some russian forum. It uses 3 PT2399s. Maybe you could have a go building a modified version of that.

[mth5044]

There is a schematic for the inside of the belton brick over at some russian forum. It uses 3 PT2399s. Maybe you could have a go building a modified version of that.

I believe the schematic he posted is the 3 chip/inside of the belton brick?

Anyway, it's hard to say what could have gone wrong with your project without any pictures, voltages, information, etc.

[sajy_ho]

I believe the schematic he posted is the 3 chip/inside of the belton brick?

Yeah It's basically a schematic that I found from Belton brick on the web: ,
plus GGG's D-Verb as input and output buffer/mixer.

Anyway, it's hard to say what could have gone wrong with your project without any pictures, voltages, information, etc.

The circuit is on the breadboard for a long time and actually I was hoping someone take a look at the schem and see what is going on there.
Anyway thanks...

[sajy_ho]

Here is a photo from the breadboard, I don't know if it comes handy:

And this is a sound sample, first the mix knob is at min then goes to the max, and with that only a noise appearing more and more and no reverb is in the sound:
https://soundcloud.com/sajy_ho/voice-002

[~arph]

Maybe one of the PT2399s is locked up.. try increasing all pin 6 to gnd resistors to something like 4k7 and see if it starts to verb

[samhay]

Audio probe?

[sajy_ho]

Maybe one of the PT2399s is locked up.. try increasing all pin 6 to gnd resistors to something like 4k7 and see if it starts to verb

I used 10k trimpots and tested every possible value, but still it's not working...

Audio probe?

That's a good idea man!
I just noticed one more thing comparing the given schem with this one from bdtr-1 :

and the following photos:





What is that guy at top-right of the schem? Because I didn't included it according to bdtr-2 schematic(the first one).

[bluebunny]

It's a simple op-amp mixer for the signals coming from pin 12 of each PT2399, the output of which seems to be getting fed back into the PT2399s.

[sajy_ho]

It's a simple op-amp mixer for the signals coming from pin 12 of each PT2399, the output of which seems to be getting fed back into the PT2399s.

Ohhhh now I get it! So the "GF" marker on the first schem (btdr2) is a single opamp too?
If yes, how should I include it in the first one?

[deadastronaut]

cool, good to see someone having a go at this...whats the 74hc14 for?...

[samhay]

>Ohhhh now I get it! So the "GF" marker on the first schem (btdr2) is a single opamp too?
>If yes, how should I include it in the first one?

No. Just connect the 3 points labelled GF together.

>whats the 74hc14 for?...

The LFO.  See 'Schmitt Trigger inverter Oscillator' here: http://how-to.wikia.com/wiki/How_to_build_an_oscillator_circuit

[~arph]

cool, good to see someone having a go at this...whats the 74hc14 for?...

Modulation, but why not use the op amp in the first pt2399 ( they are using it already for the mod) and drop the silly square wave oscillator on a huge ic with all those unused inverters ..

[samhay]

The leftmost PT2399s are used as input buffers/filters. You could do away with one of the output op-amps I guess, but probably best to use something else - an op-amp makes as much sense as anything else for a discrete implementation of the brick.

[~arph]

If I look at the pencil schematic the leftmost pt2399 has one op amp buffering and filtering the modulation signal ( between pins 13 and 14)

[samhay]

Ahh top right. Gotcha.

[Adventure_Audio]

I've had this schematic on the calendar for a month now. I am going to give it a shot. Finally got all the parts in the other day but I am going to be incorperating it into a reverb + delay/chorus based off this french duders video:

http://www.youtube.com/watch?v=vZ136J05dCU

SO, Ive been wondering to myself...

What is the difference between the Belton Brick 1 and 2? I read on another forum that Belton "took some advice" and revised their schematic, but what did they change exactly?

[~arph]

At a quick glance:

Buffered mixer for internal feedback and two reverb outputs. Probably more changes