DIY_UEGO updates

[rr]

Here is a circuit that can be used to replace POT R44 on the
UEGO controller board. This circuit uses a voltage reference
and an op-amp as a voltage follower. The LM385 is a TO-92
package.



       4V
        |
        |
        |
        \
        /
        \  10k, 5%
        /
        \
        |
        |
        O-------------------             |-----------------|
        |                  |             |                 |
       2|  /               /             |     |\          |
    /------                \ 17.4k, 1%   |     |  \        |
       /\                  /             |-----|-   \      |
      /  \                 \                   |      \    |
     /    \  LM385Z-1.2    |                   |       >---O---VSref:
450mV
     ------                O-------------------|+     /
       3|                  |                   |    /
        |                  /                   |  /
        |                  \ 10k, 1%           |/    LM324
        |                  /
        --                 \
        \/  0V             |
                           |
                           --
                           \/ 0V





Re-visiting the Q1 circuit. Once the voltage supplies were
changed from +-2.5v to +-4v, along with D12 & D13 going away.
The resistors R17 & R15 need to be changed:

Use a 93.1k for R17.
Use a 24.0k for R15.

R16 stays at 180K.

BobR.

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