midwest analog : Voltage Controlled Analog Delay

[mathflan]

Hi,

I 'am very insterested to build this project :

http://www.midwest-analog.com/diydel.html

there are the scheamatic, the pcb and the part list.

I'am wondering if someone has ever built this project?

the problem with this project is that it use a SAD4096 and an opamp 4739 which are no longer available.

Is there equivalent for SAD4096 and the opamp 4739??

[pooka]

sorry I lost it

[Mark Hammer]

Unfortunately, in the absence of available SAD4096's, and given the difference in pinout between the 4739 and other better more available dual op-amps, the project would need a complete PCB redraw and layout.  That doesn't mean it's a bad project and not worth doing, just that it will take a lot more legwork than the posted article (I have the same thing in a back issue of POLYPHONY) would suggest to get it up and running.

[Paul Perry (Frostwave)]

A completely different approach to a voltage controlled delay:

http://home.comcast.net/~sbernardi/elec/og2/og3_echo.html

[Mark Hammer]

Three very big cheers for Scott Bernardi.

BTW, those of you who have tinkered with "backwards reverb", where the recirculation swells, rather than decays, this might be just the ticket.

[StephenGiles]

Thanks for the link Paul, I somehow erased it at some point. There is some very interesting stuff on his site.
Stephen

[puretube]

this somehow reminded me of an older thread:
http://diystompboxes.com/sboxforum/viewtopic.php?t=27488.

now, a drop-in replacement for a 4096
would be a real challenge for any true analog
guru...