Echo Base - a new PT2399 delay

[1reeko1]

Hey guys!

I've finaly finished my build and it's awesome! thanks for all the help!!

I will make a video in the near future with sounds for you to hear. I'm really happy that I understand this build more now!

thanks slacker for your time an effort!!

here's the link to the image: https://www.dropbox.com/s/7du8lz8cxy4mpbk/FullSizeRender.jpg?dl=0

p.s. I hope you can see the photo

[BoogiemanX]

Omg so many pages. Anyone have latest layout and pcb? Or link to containing page?

[garcho]

http://www.musicpcb.com/pcbs/echo-base-delay

^ Highly recommended, also comes with an extensive build thread. Has the most common mods and how to wire them with the PCB in the documentation as well.

[slacker]

here's the link to the image: https://www.dropbox.com/s/7du8lz8cxy4mpbk/FullSizeRender.jpg?dl=0

Looks great.

[bluebunny]

Looks great.

+1   

[BoogiemanX]

I was actually looking for a layout so I could etch pcb myself. Feel like im cheating a bit if I buy a premade pcb. Wouldn't really be a DIY if I didn't make it. Takes the fun out of the whole thing.  Plus I Have copper clads and ferric chloride already. But thanks for the link anyway. That will be my backup plan if etching doesn't go as planned.
So what is difference between Ver.1 and Ver.2 ?
Pros and cons if any?

[slacker]

There's a PCB layout for version 1 here http://chawk.wordpress.com/files/2008/02/echo_base_pcb.pdf I don't know of any layouts for version 2.
The main difference between the two versions is the input buffer, the original one was a bit noisy although plenty of people built it without any complaints.
It wouldn't be hard to hack the pcb layout to change the version 1 buffer into the version 2.

[davent]

There's a PCB layout for version 1 here http://chawk.wordpress.com/files/2008/02/echo_base_pcb.pdf I don't know of any layouts for version 2.
The main difference between the two versions is the input buffer, the original one was a bit noisy although plenty of people built it without any complaints.
It wouldn't be hard to hack the pcb layout to change the version 1 buffer into the version 2.

I made a little adapter board for the new buffer that plugged into the ic socket of the old buffer.

[BoogiemanX]

That adapter board is great.
Do you have a layout for that?

[davent]

That adapter board is great.
Do you have a layout for that?

I think this does it, was along time ago and i messed up trying to upload...

A short stubby 47uf cap would fit normally, the one i had was too tall so needed to be flopped over.

http://www.aronnelson.com/DIYFiles/up/EchoBase_Buffer_Pcbdoc.pdf

dave

[s0b9r]

Hello

I tried to make a board with just the modulation part of the Echo Base.
Can someone tell me if it's correct?


http://postimg.org/image/9ztcep5dj/


And also, would it work as an add on board on other pt2399 delays?


Thanks in advance!

[slacker]

HI

Yes that looks correct to me and yes it should work with most PT2399 delays.

Welcome to the forum

[s0b9r]

Nice!
Thanks for the reply and the welcome!

[Bananas]

Can't find PCB for Version 2. Is it exists?
...

This is info for Mr Gambit07, tried to reply to your PM but it says your inbox is full. Thought I'd put his here in case you check out the forum.

As far as I know no one has made a DIY PCB layout for the latest version, the only PCB is the musicpcb one which you have to buy http://musicpcb.com/pcbs/echo-base-delay/.
There is a vero layout with all the mods http://www.sabrotone.com/wp-content/uploads/2011/05/EchoBase.gif

There is a PCB layout for the first version here http://www.aronnelson.com/gallery/main.php?g2_view=core.DownloadItem&g2_itemId=44171.

If you have the skills you could probably modify this into the latest version, it is mostly changes around the top right hand TL072.

[Bananas]

There's a PCB layout for version 1 here http://chawk.wordpress.com/files/2008/02/echo_base_pcb.pdf I don't know of any layouts for version 2.
The main difference between the two versions is the input buffer, the original one was a bit noisy although plenty of people built it without any complaints.
It wouldn't be hard to hack the pcb layout to change the version 1 buffer into the version 2.

Your Vero has 36 resistors but schematic for Version 2 has only 35 resistors. There is no one 10k.
And building pdf has parts manifest with 37 resistors (two 22k) but in schematic in that pdf - same 35 resistors.
Where is the true? 

[slacker]

Your Vero has 36 resistors but schematic for Version 2 has only 35 resistors. There is no one 10k.

I think R36 on the vero is the extra resistor, this is for the "dub madness" mod in the build pdf http://www.musicpcb.com/s/Echo-Base-build-PDF-updated-051810.pdf that resistor is not shown on the schematic.

And building pdf has parts manifest with 37 resistors (two 22k) but in schematic in that pdf - same 35 resistors.
Where is the true?

The two 22k resistors are for the "humbucker friendly" mod in the build pdf, they replace the two 47k resistors.

[Bananas]

Well, going to try to draw PCB for version 2. Going  to follow this schematic. I hope I'm not miss any thing:


Could you help me to clarify two detail about the schematic, please?
I'm not sure of the correct arrangement of the contacts of the potentiometer "Speed". Which of the contacts is directed to resistor R2 (27k), "1" or "3"?
And I'm not sure on the modification  "LFO waveshape".
Where to connect the contact "3" of the pot "Shape"? In simple words, to the C25 or to the R2?

[brunob2]

Hello Diyers,
i'm reviving an old thread, but I'm sure there are still a lot of people interested in this great projet.

I've built the delay on a breadboard to check it out, using the echobaserev2 schematics dated 30/03/2010.

Very very nice delay..but the modulation part is not working, and I can not find where I made a mistake..

I checked the circuit and the values several times..still no mod..

The only thing that happens when I move the Mod Depth pot is the Delay Time going very noticeably slower or faster.

The Mod Speed has zero effect..

I'm using 2x TL072CP from Texas Instruments, 1x 2N5089, 1x 2N5087, 1x CD4066, 1x PT2399 and a non-polarized electrolytic 1uF cap.

The one thing I'm confused with is how the CD4066 is powered and grounded, I can't find anything on this schematics, but still I put 9V on pin 14 and grounded pin 7.

Here are my voltages, some are a bit crazy indeed:

PT2399
1. 5v              OK
2. 2.5v      OK
3. 0              OK
4. 0              OK
5. 2.89v           3.35V
6. 2.5v      ok
7. 0.5v      0.68V
8. 0.5 v           0.76V
9 - 16 all 2.5v    OK

4066
Some of the voltages change depending on if the effect is on or bypassed (off) so I've shown the voltages for the different states.

1. 4.6v         2.05V
2. 4.6v         2.05V
3. 0.4v         0V
4. 0.4v         0V
5. 0                 0.07V
6. 0.45v off 4.5v on   7.15V !!
7. 0                 0.07V
8. 9v                 2.5V
9. 3v on 0.32 off   2.5V
10. 4.6v              2.92V
11. 4.6v              2.53V
12. 8.5 on         7.39V
13. 8.5 on              8.50V
14. 9                 9V

When the effect is off depending on which position the tails/Boss switch is in either pin 12 or 13 will be 1.25v the other will be about 8.7 volts.

The TL072 voltages are

U3 top left of vero

1. 5v
2. 5v
3. 5v
4. 0
5. 5v      OK EXCEPT 5=2.5V
6. 5v
7. 5v
8. 9v

U1 bottom left of vero, this is the LFO

1. changes             5V
2. 5v                OK
3. 5v                OK
4. 0.8v      2.5V
5. changes           3.35V
6. 5v                OK
7. changes           3.85V
8. 8v              6.41V

The voltages on the 5089 should change depending on the position of the bypass switch.
E. 0                 0.05V
B. 0.63v off 0 on   0.05V
C. 0.89v off 8.5v on   8.5V

Any idea anybody?

Thnks a lot
b

[slacker]

HI

Going from your voltages something is wrong around the LFO opamp. I would check that the resistors going to pins 4 and 8 of the opamp are the correct value, they should be 220 Ohms, if you've used say 220k by mistake that could cause the problem you're having.

Welcome aboard

[brunob2]

Thank you very much slacker,
and thanks for the warm welcome

I hate wasting people's time, but I've been browsing mostly all 76 pages of that thread, and couldn't find an answer..
(I'm just more motivated to make it work and try on those awesome mods!)

You were right, my 220R resistors were mislabeled! (I just got a huge assortment not long ago..)
They were really 1.2K!
And because I switch components when I troubleshoot, I just took some from the same mislabeled package without checking their actual value with a multimeter..

I had to replace them with 240R resistors though as I don't have any 220R

Also, instead of using a 10M resistor at pin 6, I used 2x 5.1M in series.

So now I got voltages right around the TL072 Lfo, but still the same symptoms and no mod..some weirdness remain for the CD4066's voltages and the other opamp:

4066

1. 4.6v         2.89V
2. 4.6v         2.89V
3. 0.4v         0V
4. 0.4v         0V
5. 0         0V
6. 0.45v off 4.5v on   7.15V !!
7. 0         0V
8. 9v         2.56V
9. 3v on 0.32 off   2.56V
10. 4.6v      2.88V
11. 4.6v      2.88V
12. 8.5 on         7.39V
13. 8.5 on      8.50V
14. 9         9V

When the effect is off depending on which position the tails/Boss switch is in either pin 12 or 13 will be 1.25v the other will be about 8.7 volts.

The TL072 voltages are

U3 top left of vero

1. 5v
2. 5v
3. 5v
4. 0
5. 5v      OK EXCEPT 5=2.5V
6. 5v
7. 5v
8. 9v


I really can't find out where the next problem comes from..I've checked my values with a proper ohmmeter.

Any help would be greatly apprieciated!
b