Author Topic: Echo Base - a new PT2399 delay  (Read 897613 times)

kipper_71

Re: Echo Base - a new PT2399 delay
« Reply #1020 on: April 13, 2011, 09:00:49 AM »
Hi Guys,

Just been reading through the thread in preparation for taking on this project.  Looks like this one's really caught peoples imagination - thanks for sharing, Slacker!

I'm planning to keep things pretty standard, but one possible mod that really grabbed me was the idea of having a second switchable "Time" pot to give two presets - i2k posted about this back on page 5.

Does anyone see a problem with this?  My limited knowledge and the other posts on this thread suggest that the process of switching between the two pots could result in momentary infinite resistance on pin 6 of the PT2399, leading to a signal spike.

Any alternative ideas about how this could be avoided?

Cheers,

Pete

tasos

Re: Echo Base - a new PT2399 delay
« Reply #1021 on: April 13, 2011, 09:45:29 AM »
you could try diodes...! ::)

merlinb

Re: Echo Base - a new PT2399 delay
« Reply #1022 on: April 13, 2011, 09:59:05 AM »
My limited knowledge and the other posts on this thread suggest that the process of switching between the two pots could result in momentary infinite resistance on pin 6 of the PT2399,
Any alternative ideas about how this could be avoided?
Here's one possibility:

deadastronaut

Re: Echo Base - a new PT2399 delay
« Reply #1023 on: April 13, 2011, 10:07:49 AM »
hi guys, i built this a long time ago..and f....... love it..best analog/digital delay pedal ever imo...thanks slacker.

ive noticed a few peoples echo bases with other mods though!..

is there an up to date list of possible mods for it now?.....
https://www.youtube.com/user/100roberthenry
https://deadastronaut.wixsite.com/effects

chasm reverb/tremshifter/faze filter/abductor II delay/timestream reverb/dreamtime delay/skinwalker hi gain dist/black triangle OD/ nano drums/space patrol fuzz//

slacker

Re: Echo Base - a new PT2399 delay
« Reply #1024 on: April 13, 2011, 01:18:10 PM »
Here's one possibility:


That's how I'd do it, I think I suggested that method somewhere in this thread, thanks for posting that, probably much clearer than my explanation was :)

slacker

Re: Echo Base - a new PT2399 delay
« Reply #1025 on: April 13, 2011, 01:49:19 PM »
hi guys, i built this a long time ago..and f....... love it..best analog/digital delay pedal ever imo...thanks slacker.

Cheers.

Quote
is there an up to date list of possible mods for it now?.....

Taylor's build document for his PCB contains all the mods that I know of. The instructions only reference his layout but they all work with any version. I'll see if I can knock up a schematic showing them all for people who are building other versions.

http://www.aronnelson.com/gallery/main.php?g2_view=core.DownloadItem&g2_itemId=43077

deadastronaut

Re: Echo Base - a new PT2399 delay
« Reply #1026 on: April 13, 2011, 01:54:53 PM »
cheers ian, yeah i built the anonfaceless layout..
https://www.youtube.com/user/100roberthenry
https://deadastronaut.wixsite.com/effects

chasm reverb/tremshifter/faze filter/abductor II delay/timestream reverb/dreamtime delay/skinwalker hi gain dist/black triangle OD/ nano drums/space patrol fuzz//

kipper_71

Re: Echo Base - a new PT2399 delay
« Reply #1027 on: April 14, 2011, 04:42:06 AM »
Here's one possibility:


That's how I'd do it, I think I suggested that method somewhere in this thread, thanks for posting that, probably much clearer than my explanation was :)

Cheers guys, I'll give that a go.

Roll on payday ...  :)

mr_deadmaxxx

Re: Echo Base - a new PT2399 delay
« Reply #1028 on: April 14, 2011, 05:21:55 AM »
My limited knowledge and the other posts on this thread suggest that the process of switching between the two pots could result in momentary infinite resistance on pin 6 of the PT2399,
Any alternative ideas about how this could be avoided?
Here's one possibility:


specifically, what does this do to the effect output?

Barcode80

Re: Echo Base - a new PT2399 delay
« Reply #1029 on: April 14, 2011, 10:22:52 AM »
shouldn't affect the output at all. It's just allowing you to have two different delay time pots so you could switch between two settings instantly.

drbob1

Re: Echo Base - a new PT2399 delay
« Reply #1030 on: April 14, 2011, 02:57:14 PM »
Is there a way to make one of the delay pots automatically go to 3/4 of the other? Then you could instantly switch from 1/4 to dotted 8th delays!

Barcode80

Re: Echo Base - a new PT2399 delay
« Reply #1031 on: April 14, 2011, 05:19:43 PM »
The only way I know would be to plunk down the measly 20 bucks on a taptation kit from aron's store. Then you get that functionality and tons of other cool options.

bandmbill

Re: Echo Base - a new PT2399 delay
« Reply #1032 on: April 18, 2011, 11:28:08 AM »
Just found details of Taptation - looked at the datasheet and interface app note - do I just replace the time pot with TapTation?

Is it that simple or are there better ways to do it?

Thanks

Bill

Barcode80

Re: Echo Base - a new PT2399 delay
« Reply #1033 on: April 18, 2011, 11:49:25 AM »
Just found details of Taptation - looked at the datasheet and interface app note - do I just replace the time pot with TapTation?

Is it that simple or are there better ways to do it?

Thanks

Bill

It's that simple. Instead of wiring the time pot to the echo base board, you wire it per the schematic to the taptation circuit. Then just wire +5v, ground, and pin 6 of the PT2399 to the taptation circuit as indicated in the taptation schematic and you are in business.

bandmbill

Re: Echo Base - a new PT2399 delay
« Reply #1034 on: April 18, 2011, 12:07:49 PM »
That makes a wonderful pedal just about perfect!!

Thanks

Bill

poodlebra

Re: Echo Base - a new PT2399 delay
« Reply #1035 on: April 22, 2011, 09:47:34 AM »
slacker - it'd be super good if we could have a schematic showing all the mods. i've been trying to spot what should go where on dimebug's PCB but can't figure a few of them out (like the clean signal kill switch). there seem to be a few different component values on his compared to taylor's. cheers.
Quality, cheap pedal parts, because the Poodle cares.
Germanium cans and diodes, PCBs, Full Stompbox Kits, UK's cheapest 3PDT:
http://www.pedalparts.co.uk/

poodlebra

Re: Echo Base - a new PT2399 delay
« Reply #1036 on: April 22, 2011, 12:30:57 PM »
Looks like that's where the problem is, the collector voltage when On is too high, it should be about 1 volt or less. With 4.7 volts on the collector the switching will be on all the time.
Double check the connections and value of all the components around the 2N5089 and make sure the transistor is the correct way round.

If you want to check that everything else is working then touch the middle pin of the tails switch to ground and that should bypass the effect.

just revisited this as it's been sitting in the 'to do' pile for a long time. i did have the 5089 the wrong way round  :-\. thanks for the advice. i've just made dimebug's pcb, so want to build another with all the groovy mods once i can discern how they translate from taylor's board to DBs.
Quality, cheap pedal parts, because the Poodle cares.
Germanium cans and diodes, PCBs, Full Stompbox Kits, UK's cheapest 3PDT:
http://www.pedalparts.co.uk/

Vince_b

Re: Echo Base - a new PT2399 delay
« Reply #1037 on: April 27, 2011, 10:24:22 PM »
I want to add an effect loop to my Echo Base, but  I don't know how to do it. According to Slacker there is 3 possible places to put an effect loop: "A", "B" and "C".
Here is the schematic: http://www.eskimo.plus.com/fxstuff/echobasenotes.png
What I don't understand is if I break the circuit at one of those points to put a send and a return jack, the circuit will always be open if I don't put something in the effect loop. What can I do if I want the circuit to remain "close" when there is nothing in the loop?

Thanks to anyone who can help me with this.

egasimus

Re: Echo Base - a new PT2399 delay
« Reply #1038 on: April 28, 2011, 12:04:46 AM »
^ [img=http://www.bakersfieldads.net/Oildate-/Manufacturing-/New-5-x-switched-mono-jack-socket-for-6-3MM-jacks.jpg]http://Jacks with normally-closed switches[/img].

Vince_b

Re: Echo Base - a new PT2399 delay
« Reply #1039 on: April 28, 2011, 09:56:19 AM »
Thanks egasimus, it should do the trick. The funny thing is that I already have a couple of jacks like that but I never knew what they were for.