Echo Base - a new PT2399 delay

[kipper_71]

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]

you could try diodes...!

[merlinb]

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]

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?.....

[slacker]

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]

hi guys, i built this a long time ago..and f....... love it..best analog/digital delay pedal ever imo...thanks slacker.

Cheers.

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]

cheers ian, yeah i built the anonfaceless layout..

[kipper_71]

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]

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]

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]

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]

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]

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]

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]

That makes a wonderful pedal just about perfect!!

Thanks

Bill

[poodlebra]

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.

[poodlebra]

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.

[Vince_b]

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]

^ [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]

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.