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from a net search

Posted by Mart on April 3, 2002 at 21:15:19:

Subject: Carver ribbon passive crossover

Here is the Carver ribbon passive crossover from the bass archives:

Bob

From: warnerd@moosilauke.dartmouth.edu (Doug Warner)
Date: Tue, 28 Jun 1994 20:51:26 -0400
Subject: Re: Carver Ribbon

Okay. Here is the circuit for the "Amazing Loudspeaker" Platinum Mark IV, shamelessly copied from _The Audio Critic_, no 17.

                       8.5 uF
                                 0.1
                         ||
          +--------------||----/\/\/\/-----------------------------------+
          |              ||                                              |
          |                     76 uH          750 uH         480 uH     |
          |                      ____           ____          ____       |
          |                   +--0000--+     +--0000---+   +--0000--+    |
          | 100 uF            /        |     /         |   /        |    |
          |                   \ 0.1    |     \ 0.4     |   \ 0.4    |    |
          |  ||               /        |     /         |   /        |    |
Input ----+--||-----+---------+        +-----+-/\/\/\/-+---+        +----+
          |  ||     |         |  3 uF  |     |  5.5    |   |        |    |
          |        (0         |        |     |         |   |   4    |    |
          |        (0 5.25 mH |   ||   |     |         |   |        |    |
          |        (0         +---||---+     |  35 uF  |   +-/\/\/\-+    |
          |         |             ||         |         |                 |
          |         \                        |   ||    |                 |
          |         / 2.25                   +---||----+                 |
          |         \                            ||                      |
          |         /                                                    |
          |         \                                     +--------------+
          |         |                                     |              |
          |        ---                                    |              \
          \                                               |              /
          /                                               |        0.2   \
          \ 1.4                                           |              /
          /                                               |              \
          \                                               |              |
          |                                               |              |
          |                                               |             (0
          |                                               |      160 uH (0
         (0                                               |             (0
 11.2 mH (0                                               \              |
         (0     350 uF                            Ribbon  /              |
          |  ||                                           \       4 uF --+--
          +--||----+                                 4.6  /            --+--
          |  ||    |                                      \              |
         (0       ---                                     /              |
  6.9 mH (0                                               \              \
         (0                                               |         2.5  /
          |                                               |              \
          |                                               |              |
          \                                               +--------------+
          /                                                              |
     0.7  \                                                              |
          /                                                             ---
          \    460 uF    3.6
          |     ____
          +-----0000---/\/\/\/----+-----+--------------+
                                  |     |              |
     woofer     /|\      /|\      |     |              |
    voice coil   +--------+       \    (0            --+-- 10000 uF
                                6 /    (0 5.3 mH     --+--
                                  \    (0              |
              woofer motion -    |     |              |
                                  +-----+--------------+
                                        |
                                       ---

Of course, no guarantees of accuracy expressed or implied. I don't think I made any mistakes, though. :-) Some of the resistors are actually trimmers in the loudspeaker.
Doug Warner

... just my 2¢

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