Echo Base - a new PT2399 delay

[CodeMonk]

So where can I find the latest layout.
Preferably with the latest mods. Or not. I can figure those out.
I have found myself with some "free time" over the next few weeks and would like to build another Echobase.
Built one a few years ago. Really liked it. Gave it to one of my students so I no longer have it.

Thanks

And great job slacker!

[azrael]

ahahah, you lazy old bum. :p:
http://blogs.yahoo.co.jp/anonymousfacelesscoward/18854450.html

check musicpcb.com for Taylor's build documentation to see some mods.

[CodeMonk]

Managed to run across that after posting. Thanks though.
I'll check that site for the mods.

MC

[novakram]

Just wanted to say THANKS SLACKER!

Built a 'stock' Echo Base on vero - my 2nd build, and no 'debugging' required! (apart from a beginners mistake of using a metal DC socket - "it worked out of the enclosure!?!") I've also ended up putting the toggle switch in a silly place: too close to the footswitch really; no biggie though - just be careful not to STOMP!

Will now look into some of the mods - think the only one for me is the feedback time; adjusting the resistor for that pot, but I need to play with the pedal a bit more yet...

One issue perhaps: when the effect is 'bypassed', if i turn the feedback pot fully up I get noise as if the pedal was switched on (if the level is not on zero)...I assumed this was normal because of the type of switch bypassing?

Thanks again!

[slacker]

Thanks for the thanks

If the bypass is set to tails, then in bypass the output of the delay is still connected, this is how you hear the tails. Therefore if you turn the feedback all the way up so the pedal is self oscillating then you will still hear it in bypass.

If the bypass is not set to tails then you might still faintly hear the delay if it's self oscillating, I think this is just because the signal is so loud it bleeds though the CD4066, but it could be getting into the output by some other way.

It should be a pretty simple mod to fix this if it's a problem, I'll have a think.

[novakram]

Great!

I'm going to have a proper play with it tonight so will find out if I've soldered any problems into the circuit!

[foozertone]

This may have already been covered (I don't have gumption to tackle the whole thread) but how essential is it to use the 20k resistors or can I just use 18k or 22k. If I have to parrellel or series it can you please give me explicit directions. I really appreciate any help.

Thanks
Jeff

[Taylor]

You should be fine with 22k.

One 20k is part of a lowpass filter going into the delay chip. 22k will shift the cutoff slightly lower (1.5k vs. 1.7k) but I doubt the difference is noticeable. The other 20k limits the max feedback. Again the difference will be negligible, especially since you have the feedback knob.

[rmachado]

Hello friends, sorry if I posted in the wrong place, but here it goes:
I recently bought a Boss PH-1r, and it not looks a lot like another PH-1r I had a few years ago.
What does the bias trimpot?, as shown in the schematic at this link:

http://www.geofex.com/FX_images/Boss%20PH-1r.pdf

Sorry my english.
Thank you all.

[poodlebra]

hmm, not sure why but my question seems to have disappeared... I wonder if anyone has the time or wherewithall to stick taylor's mods onto a schematic rather than his helpful (but hard to follow) document. i'm sure that's fine if you're using his multi-layer PCB, but i'm about to build dimebugg's PCB and i'm a bit stuck with a few of them?

thanks for this schem Slacker - i've already built one on vero and it works a treat, though it took a while to work out i had the 2n5809 reversed so it wouldn't bypass!

[slacker]

I haven't had time to do the mods schematic yet, I'll see if i can do it over the weekend.

[poodlebra]

superstar! cheers

[slacker]

Here you go

http://www.eskimo.plus.com/fxstuff/lfomods.jpg LFO mods

http://www.eskimo.plus.com/fxstuff/audiomods.jpg audio mods. The schematic shows the input buffer and output mixer from Taylor's PCB not the original version. The mods are the same for either version.

[poodlebra]

perfect and outstanding. many thanks. 

[Sanguinicus]

After much consideration, i've decided to go with this over the Rebote 2.5. But the modulation doesn't really interest me. Is it possible to just omit the modulation circuit and ground those pins that it was connected to on the PT?

[Barcode80]

After much consideration, i've decided to go with this over the Rebote 2.5. But the modulation doesn't really interest me. Is it possible to just omit the modulation circuit and ground those pins that it was connected to on the PT?

If you look in Tyler's build document on his site, you can see how to do the modulation kill mod. Just wire it permanently instead of with a switch, and omit the pots for modulation.

[slacker]

If you don't want it at all then looking at the schematic leave out U1 and everything connected to it up to and including the BC560 and the 39k resistor. Connect the spare end of the time pot to ground same as on the Rebote.

[deafbutpicky]

Hi,
I'm new here, but long time reader of this thread. After finally managing to register here, I wanted to contribute some layouts for the Butchered TBP
version from slacker with the latest buffer version and the new buffer on it's own vero. It's not verified yet, but maybe someone might risk an eye...

http://forum.musikding.de/vb/attachment.php?attachmentid=6894&d=1300543356
http://forum.musikding.de/vb/attachment.php?attachmentid=6895&d=1300543372

[BoxOfSnoo]

Hi,
I'm new here, but long time reader of this thread. After finally managing to register here, I wanted to contribute some layouts for the Butchered TBP
version from slacker with the latest buffer version and the new buffer on it's own vero. It's not verified yet, but maybe someone might risk an eye...

http://forum.musikding.de/vb/attachment.php?attachmentid=6894&d=1300543356
http://forum.musikding.de/vb/attachment.php?attachmentid=6895&d=1300543372

We can't see those attachments.  Can you post them somewhere else?

[phector2004]

Don't know if this has come up yet, but I'd just like to contribute something I discovered:

After building the echo base, I was thrilled, but over time it started acting funny. I'd get self-oscillation when playing with the Depth and Delay knobs with Feedback turned way down, and there was this horrible ticking coming from the LFO whenever I switched modulation on. Not too noticeable until you use a booster or something after the EB.

Well my brother's puppy decided to pee on my Uglyface and V847 last week, so I took my whole chain apart to clean up, unplugging my Echo Base for the first time since I built it (yes, it's that good, thank you  )

All noise issues gone! I'm guessing sending it into oscillation over and over and over without powering off was the cause of this... Resetting was a quick fix for me. Could anybody else with ticking issues confirm?