Best DIY Analog Delay??

[Superfuzzed]

Hey folks,

I realized I need a analog delaypedal, something like the Maxon AD 999 .  Is there a diy project that comes close to the maxon ?


Can someone please recommend me some circuits, would be nice . 



thanks

[Nemuikuma]

good question, i would like built an analog delay, but don't know witch to build.
there are some good digital model, but i wan't to keep my signal chain analog.

[boogietube]

There's only a few, but none have the 900ms delay times that Maxon claims.

The longest would be this one, although you should have a scope to calibrate it:

http://www.generalguitargadgets.com/content/view/48/26/

This one is digital, but reputed to have that "analogue" sound. Shorter delay times, however.

http://www.generalguitargadgets.com/content/view/125/26/

A hell of a lot of people have built this one. Again, digital, but warm:

http://www.tonepad.com/project.asp?id=51

And let's not forget this one. Probably the coolest in my opinion:

http://www.diystompboxes.com/smfforum/index.php?topic=60662.0

You can get boards here for the echo base:

http://www.diystompboxes.com/smfforum/index.php?topic=83525.0

[jkokura]

Two not mentioned above, one I've built (BYOC) and really liked.

http://www.madbeanpedals.com/projects/index.html - Aquaboy at the top is a clone of the Aqua Puss

http://www.buildyourownclone.com/analogdelay.html - Is quite nice sounding, and features a very long amount of analog delay (uncommon amoung diy delays)

Jacob

[Mark Hammer]

The Maxon AD-999 has had several different incarnations, as the availability of BBD chips changed.  Initially, it used 8 MN3007 chips, each with its own clock chip, bias trimpot and balance trimpot.  I think it may be down to the same chip complement that the BYOC project has, which is four MN3205 chips, for a total of 16k stages.

This is going to be a VERY difficult project.  The sort of thing that anyone who asks the question you did will find a significant challenge.

And quite frankly, if you need THAT much delay time, you probably want to opt for digital.  Analog is fine, for short delays, but a single repeat through the regeneration path of the BYOC unit will mean that the signal has passed through 32k bucket brigade stages, or the equivalent of 8 repeats through a single MN3205 chip.  When it comes to BBD chips, there is a small amount of error with each stage-to-stage handoff, the error increasing in size the longer you make each stage hold the sample before passing it along.