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DIY Stompboxes => Building your own stompbox => Topic started by: bogwalrus on April 15, 2012, 02:30:16 PM

Title: Breadboard effects pedal help.
Post by: bogwalrus on April 15, 2012, 02:30:16 PM
This is going to be a tough one but i'm looking to create a few different effects using the most minimal parts and little change around when using a breadboard.


The idea is that i can have one effect set up on my breadboard and in a short amount of time i can move a chip or a few resistors around and presto a new effect sound.



I have all the parts to build a nice echo delay with the pt2399 ic. I'm wondering what other effects i can create using the same parts etc.


If any of you have some breadboard diagrams for different effects i'd love to have a look.

I greatly appreciate your help :icon_smile:

Boggy



Title: Re: Breadboard effects pedal help.
Post by: senko on April 15, 2012, 10:38:34 PM
Put a 22k resistor from pin6 to ground.  To change the delay time on the fly, just put another resistor in parallel.  You could also just drop a large (100uF) capacitor in parallel for some cool effects. 

(http://circuits.datasheetdir.com/270/PT2399-circuits.jpg)

The 10k resistor coming from the wiper terminal of the mix pot (50k) can be decreased or increased with feedback increasing or decreasing.  I've found 3.3k is a good base value.
Title: Re: Breadboard effects pedal help.
Post by: bogwalrus on April 16, 2012, 06:45:41 AM
That's a nice schematic. Is that for an Echo Delay?


I'll have a mess around with the resistors and see what happens.


Thanks very much for the help. Its a good starting point=)

Is there any way of creating a really crazy sounding random noise like glitch using the pt2399?


Excellent :icon_biggrin:
Title: Re: Breadboard effects pedal help.
Post by: artifus on April 16, 2012, 06:50:04 AM
http://www.diystompboxes.com/smfforum/index.php?topic=96277.0 (http://www.diystompboxes.com/smfforum/index.php?topic=96277.0)
Title: Re: Breadboard effects pedal help.
Post by: bogwalrus on April 16, 2012, 09:24:05 AM
Thats a neat little effect. Are you sure the mars volta dont use it? lol Thanks for the schematic though as i need to familiarise with as many diagrams to find common grounds etc. :icon_biggrin:
Title: Re: Breadboard effects pedal help.
Post by: anchovie on April 16, 2012, 11:24:20 AM
You could give my PT2399 torture device a try:

http://www.diystompboxes.com/smfforum/index.php?topic=87493.0
Title: Re: Breadboard effects pedal help.
Post by: bogwalrus on April 16, 2012, 12:43:17 PM
Thats another great one. Thanks Anchovie. I can add that to the list. I think i have around 4 different circuits using similar parts just moved around a bit.

I might work on finding a common denominator meaning changing them all slightly while simplifying the whole change around.


Is it possible to create a bit crusher type sound using the pt2399?

Cheers again for your help.