Ring Modulators

[Don Tillman]

   Date: Sat, 16 Nov 1996 05:20:55 -0600
   From: majmoog at synthfool.com (Kevin Lightner)

   Thanks, this helps quite a bit, Don.
   However, here's my dilemna-

   I have a lot of raw, usused Polyfusion PCBs. Many of them are dual ring
   modulators.

(Keep in mind that I don't know anything about Polyfusions...  *dual*
ring modulator boards?   How unusual!  Typically one is plenty.)

   They would like to have 1494's and 4739's in there. I have been able to
   substitute the 4739 fine (with very grateful thanks to John Simonton of
   Paia who make a small header board with a NE5532 instead. However, I have
   no schematic for this module and thus have no pinout for anything but a
   1496. Can I sub a 1496 for a 1494? Can a header board be used that swaps
   pins around. 

No.  Like I said, the 1494 has roughly four features the 1496 doesn't
have (which is why it costs more) so you can't just swap some pins.

Is the 1494 also unavailable these days?  

   Date: Sat, 16 Nov 1996 18:27:15 +0100
   From: Magnus Danielson <e93_mda at drum.it.kth.se>

   My local we-got-it-all shop still says they have MC1496G chips, do
   you want me to go and pick some up for you?

The 1496 *is* readily available, from several manufacturers.  And it's
under a $1.00 apiece and used for so many applications I can't imagine
it ever drying up.  The 1494 and 1495 were never nearly as popular.

Howzabout the AD633?  It's only around $5.00 and seems to be a
completely fine self contained multplier chip.  And it's tiny (8-pin
dip).

  -- Don