Echo Base - a new PT2399 delay

[Chris oej]

I've tried it with both chips out and it gives me 0.78v on the output, it only goes up to 1.72v when connected to the Echobase. The Input (the top pad) is giving 9.3v. I have the rounded edge facing into the board as that was the way it seemed to work on the breadboard. Surely if its the wrong way round then there'd be 0 volage at the output pad? I've also just realised that there is only 116ohs resistance between the Input (9v) and the ground both with the chips in and out - connected and unconnected to the Echo Base. This makes me think that maybe there's a short somewhere? I'v looked over the board with a magnifying glass and can't see any solder bridges. What do you think?

[gambit07]

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.

geez, thanks! didn't know my inbox was full... thanks again for the reply!

[Chris oej]

It works!!!! It turned out i'd replaced a faulty 78L05 with another faulty 78L05. Instead i used a L7805 and it worked. Controls are:

Level
Feedback
Speed
LFO Rate
LFO Depth
LFO Shape
Hi / Lo pass filter switch
LFO on / off
Clean kill
Diodes on / off
Tails on / off
Bypass
Tap control

All crammed into 1590XX enclosure.

Thanks for all the help, it sounds awesome.
Slacker - thanks for an incredible pedal!

[slacker]

Excellent good to hear you fixed it, that's bad luck having two faulty components.

[jan007magic]

can we compile this thread and put it on a pdf. covering the basic build upto the mods?

[GodSaveMetal]

can we compile this thread and put it on a pdf. covering the basic build upto the mods?

Me too!!!! someone else?

[slacker]

can we compile this thread and put it on a pdf. covering the basic build upto the mods?

Yeah go for it

[kurtlives]

How would I add a modulation LED?
Would I use the top of the Depth pot (lug 3) as a point for the LED?

nevermind 

[garcho]

can we compile this thread and put it on a pdf. covering the basic build up to the mods?

Great idea, I volunteer jan007magic.

[mthibeau]

I am wondering what the final resolution is of using Tapation tap tempo with the Echo Base.

From what I am finding, it seems that to make the tap tempo steady (and match what was tapped) I would need to completely remove the echo base modulation (and use taptation's). Has anyone been able to get Taptation to work with Echo Base "and" have the tap tempo match what was tapped?

I have built three taptation boards, one with a Rebote 2.5 that sounds great, one with a Deep Blue Delay clone that also sounds great (I like how the high end rolls off each repeat), this third board was destined to go into the echo base, but now I am thinking it isn't really worth it since I wind up with a useless speed knob.

Thoughts, insights?

- Thanks

[garcho]

It's not possible to keep the modulation and have the standard accuracy, according to Slacker.

[garcho]

Maybe try messing with vref on pin 2 à la Frequency Central and the Little Angel chorus.

[soggybag]

I just built two of these. The first worked fine. The second passes the dry signal but, has no delay. I get reasonable voltages at all of the chips. I can trace the input signal up to the 470p cap on the upper right of the PT2399. I don't get any signal at pin 16 of the PT2399.

If anyone has any suggestions on what to check next let me know.

[KNA]

I have tried to debug this one for a while now and made some progress, but still no success. I have used the layout from Sabrotone, but with the wavemod, and measured everything and compared to Slackers voltage reading on page 4. This shows that everything seems to be correct except for the 4066 chip, from which I get the following readings:
1. 4,6
2. 4,6
3. 4
4. 0
5. 4,3
6. 0,4 on 4,07 off
7. 0
8.
9. 3,2
10. 0
11. 0
12. 0
13. 9,0
14. 9,2
I have clean signal going through in both bypass and effect mode, but the dry switch kills the signal. The feedback switch works as well.
Some of them are correct according to page, but some of them are pretty wrong I think. I have checked for solderbridges and incorrect parts and values without success, and of course put in new IC's. Does anyone have any ideas on this? Any help is greatly appreciated!

[slacker]

The Sabrotone layout uses different pins of the CD4066 than my schematic, you should get the following voltages.


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. 4.6v
3. 4.6v
4. 4.6v
5. 8.5 On
6. 0.45v off 4.5v on
7. 0
8. 9v
9. 3v on 0.32 off
10. 0
11. 0
12. 0  
13. 8.5 On
14. 9

When the effect is off depending on which position the tails/Boss switch is in either pin 5 or 13 will be 1.25v the other will be about 8.7 volts.

It looks like you have a problem round pin 4, this will probably stop the signal getting to the PT2399 which is why you hear no delay.

[slacker]

I just built two of these. The first worked fine. The second passes the dry signal but, has no delay. I get reasonable voltages at all of the chips. I can trace the input signal up to the 470p cap on the upper right of the PT2399. I don't get any signal at pin 16 of the PT2399.

If anyone has any suggestions on what to check next let me know.

Do you get any signal on pin 15? If not I would check all your solder joints in that area of the board, it seems odd that you have signal on the 470p cap but not the pins of the PT2399 as it is connected to them.

[soggybag]

I just built two of these. The first worked fine. The second passes the dry signal but, has no delay. I get reasonable voltages at all of the chips. I can trace the input signal up to the 470p cap on the upper right of the PT2399. I don't get any signal at pin 16 of the PT2399.

If anyone has any suggestions on what to check next let me know.

Do you get any signal on pin 15? If not I would check all your solder joints in that area of the board, it seems odd that you have signal on the 470p cap but not the pins of the PT2399 as it is connected to them.

Thanks for the reply. I'll check tonight when I get home.

[soggybag]

I just built two of these. The first worked fine. The second passes the dry signal but, has no delay. I get reasonable voltages at all of the chips. I can trace the input signal up to the 470p cap on the upper right of the PT2399. I don't get any signal at pin 16 of the PT2399.

If anyone has any suggestions on what to check next let me know.

Do you get any signal on pin 15? If not I would check all your solder joints in that area of the board, it seems odd that you have signal on the 470p cap but not the pins of the PT2399 as it is connected to them.

After checking again with the audio probe, I definitely get sound at pin 15 of the PT2399, no sound at pin 16.

[slacker]

Your problem is somewhere later on then, it's normal to get very little or no signal on pin 16, if you have signal on pin 15 then signal is getting to the PT2399. Do you get delayed signal on pins 12 and 14? If you do trace the signal through pins 10 and 11 of the CD4066 and the wiper of the level pot, hopefully this will show where the problem is.
If you don't get signal on pin 14 the problem is somewhere around the PT2399.

[KNA]

Now it's working! Many thanks Slacker, you where right about pin 4 because after I took a better look at that area, probably for the tenth time, I found a missing cut in the vero...
It sounds awesome! I have some noise issues though, but I think I've read about something similar earlier in the thread so I think I can sort it out. Thanks again!