Any chorus/echo/etc that uses the SAD512D?

[ExpAnonColin]

Can't find one.. let alone a schematic.

-Colin

[Mark Hammer]

The DOD 565 Chorus uses one (the schem should be at AMZ, among other places).  My MXR Commande Series (black plastic box) Flanger uses one too.

Do you HAVE such a chip?  Might be worth hanging onto and finding a buyer since it is a rare find and those who have a cherished pedal to repair can probably use it.  It doesn't produce any particular voodoo magic  that other BBDs produce.

[Mike I.]

Rev.2 ARP Omni uses three of the SAD512 in the chorus circuit, along with CD4046 for clocking. Seeing how rare these chips are though, you could probably trade one for a BUNCH of SAD1024/MN3007 etc.
Regards, Mike

[analogmike]

HI,

The MXR micro chorus V1 used the sad512 chip. As stated, those chips are hard to find, I sould be glad to trade for some MN3007 or SAD1024 chips if you'd like.

[ExpAnonColin]

Thanks for the suggestions. I don't have one, but I have quite a few RD5108A's, which are much more rare, and are very similiar in pinout to the SAD512D's except the RD has an internal clock and the SAD doesnt.  I was wondering if there was anything out there to jump off of.  I think there were 2 commercial applications of the RD, one in a 2 way radio called the 5k and the other in Schober Organ Reverb.  I (will soon) have schematics for both. I hope to figure out something and sell the chips with the schematic as a kit or just the whole lot of 200 that I have to a pedalbuilder, like Keeley, but not necessarily keeley, for the price of the chips plus rights to the schematic.  That's just dreaming, though... I've got it on the breadboard waiting for me to try this diagram I've got all worked out but I'm much to tired.

-Colin

[Manolo Dudes]

There are two packagings of the SAD512. One is 8 pins (SAD512-D) and other is 16 which is indeed a SAD1024 with a failing half. It seems that a SAD1024 has two 512s in it.

I've got one 16 piner. I bought it (10â,¬  :shock: ) to repair my MXR Micro chorus. It was a dismal to discover too late that you cannot use a 16 pin chip instead of a 8 pin chip. They're different beasts. One has internal clock and the other doesn't.

My Micro Chorus is still silent!  :cry: Anybody know how to use a MN3005 or MN3007 as a replacement in the Micro Chorus?

[Mark Hammer]

Manolo,

The 512-d does the onboard frequency dividing to provide the complementary clock signals, which means that whatever clock circuit you have on board provides only a single clock line, although it is at double the frequency (in anticipation of the frequency dividing).  If you were able to make (and had the room to install) a retrofit board for a "512" version 1024, you would need to have a flip-flop to provide complementary clock outputs at half the original frequency.  That CAN be done though, as I say, fitting it in may be another matter.

I'm only guessing here (and Mike please correct me) but I suspect the move to put frequency division on-chip stemmed from a desire to a) make any clock lines to the BBD ultra short, and b) make any clock lines exterior to the BBD package much higher in frequency so they wouldn't be audible if there was bleedthrough to other parts of the circuit.  I suppose it also holds a sort of advantage in that it reduces external circuitry a bit too.

[Manolo Dudes]

If you were able to make (and had the room to install) a retrofit board for a "512" version 1024, you would need to have a flip-flop to provide complementary clock outputs at half the original frequency.  That CAN be done though, as I say, fitting it in may be another matter.

Yes, I know and I wonder if it's worth the trouble.

AFAIK there is not a direct replacement for a SAD-512D chip and I once read that those chips were never available directly to retailers, only as a specific request to Reticon from manufacturers. I think my chances are very few