Echo Base - a new PT2399 delay

[slacker]

yeah you're right I'll fix that.

[pravudh]

Great sound, great project, I like it more than my robot 2.5 

Thank you

[returntable]

It's me again
This time I have a question about a possible mod.
I was just wondering, while I was building a parallel Universe with an additional LFO, if it would be possible to ad a waveshaper to the echoBase? It would be very cool if you could switch or blend between two waveforms like in this LFO Circuit.

I will try to figure it out myself as soon as I'll find the time, but until maybe someone here has an Idea...

[slacker]

Yeah you could do that, the example you gave is basically the same sort of LFO I used. So if you comapare that schematic with the echobase schematic it should be fairly easy to figure out where to put the pot.

So long as the output voltages are in the right range to control the PNP transistor, you can basically hook any sort of LFO you want up to it.
A square wave LFO gives a sort of octave jumping effect, as the delay switches between a short delay and a long one.
If you want something really interesting try a random LFO or a sample and hold 

[returntable]

Oh great
I will figure it out and post the results here as soon as I find the time.
Thanks a lot

[newperson]

is there a working layout for this?  i saw one person did one some time ago. 

[Chawk]

http://blogs.yahoo.co.jp/anonymousfacelesscoward/19192939.html

Has anyone verified and successfully built the Echo Base from this layout? I was going to attempt it this week?  Thanks!

[DimebuGG]

http://blogs.yahoo.co.jp/anonymousfacelesscoward/19192939.html

Has anyone verified and successfully built the Echo Base from this layout? I was going to attempt it this week?  Thanks!

Oh yes! That layout is correct and verified by me. It's not scaled but I made a scaled one in pdf format.

[Chawk]

[/quote]

Oh yes! That layout is correct and verified by me. It's not scaled but I made a scaled one in pdf format.
[/quote]


Thanks for the reply, DimebuGG! Would it be possible for you to email the scaled pdf that you made to me?

[DimebuGG]

Thanks for the reply, DimebuGG! Would it be possible for you to email the scaled pdf that you made to me?

No problem just PM me your email.

[returntable]

Yeah you could do that, the example you gave is basically the same sort of LFO I used. So if you comapare that schematic with the echobase schematic it should be fairly easy to figure out where to put the pot.

So long as the output voltages are in the right range to control the PNP transistor, you can basically hook any sort of LFO you want up to it.
A square wave LFO gives a sort of octave jumping effect, as the delay switches between a short delay and a long one.
If you want something really interesting try a random LFO or a sample and hold 

Okay, I figured out where to put the pot... now the next question, which value should the pot have? Is 1K(like in the schem i found) okay?

[returntable]

Well, I found spare 25K lin Pot and tried it... it works perfectly fine
The Squarewave gives this delay an even more interesting sound range...
I love it! And I'm gonna try the Sample&Hold Option you were talking about... I also wanted to add a second delay time pot and a DPDT, to easily switch between two preset delay times
So, now I need a new enclosure for this sweetie. And while I'm experimenting with it anyway... is it possible to make the LFO switchable too? I mean turn it on and off?
In my imagination it would be easy to put a switch between R34 and Q3... but maybe my imagination simplifies things too much

[returntable]

I've drawn the Waveshape Pot into a part of the schematic, so that everyone can try it...

[Paul Marossy]

I jsut now looked at this post... nice work. There's some cool effects in this circuit. 

[paperhouse]

just an idea - how difficult would it be to make the modulation random? could lead to some interesting sounds. maybe some sort of noise source and a S&H.

[bent]

just a silly question ! 
for the tails/boss system to work...if i'm right....it cannot be true by-pass, cause with the footswitch we cut the in and out of the effect...i dont see how it could work....so how do you wire the in/out with the switch to make the tails effect to work proprely 

sorry for the stupid question  but it's really not clear to me....

bent

[slacker]

You're right it's not true bypass. How it works is explained in the first post in this thread

Basically the input and output wire go straight from the board to the in and out jacks. The circuit is always in the signal path and the stompswitch then contols the CD4066 switches to turn the effected signal on or off.

[bent]

DOH !   


just found it on the schematic....... have about 20 build in my back and i didn't see that one... 

did i mention it was a stupid question...hope my brain wake's up .... 

Well.... let's build it now....

thank's slacker

bent

[Chawk]

Just finished building this last night:

http://chawk.files.wordpress.com/2008/02/cimg2189.jpg
http://chawk.files.wordpress.com/2008/02/cimg2190.jpg

This circuit sounds amazing! Slacker, thank you for putting this together!

It's not true bypass but I've never heard a cleaner delay than this. Better than the Memory Man in my opinion. To call this a delay isn't doing it justice it easily turns into chorus/vibrato/reverb/modulator.

Can't wait to try out the wavechange mod.

[newperson]

Chawk,
Can you email me the scaled layout that you used?