14081-figure_1

1
R 6 3.92k 0.1% 6 5 7 8 9 10 11 12 14 15 R 7 3.9k B1 B2 B3 B4 B5 B6 B7 B8 VR VR V V IOUT COMP VLC IC 1 DAC08 13 12V C 1 100 nF 4 2 16 1 J 1 J 2 C 3 100 nF 3 2 12V 8 12V 4 _ + R 1A 1M R 1B 6.49k 0.1% 3 12V C 7 100 nF IC 2A OP270 C 2 100 nF R 3 1k R 4 100k C 5 100 nF C 4 100 nF R 5 6.2k C 6 10 nF R 10 30.1k 0.1% R 11 1k 0.1% R 8A 10 0.1% R 8B 10 0.1% 7 IC 2B OP270 Q 2 MMBT2222A 1 5 6 DIGITAL INPUTS Q 1 STD8N06L IOUT Figure 1 This digitally programmable resistor features low component count and inexpensive parts.

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  • R63.92k0.1%

    6

    5

    7

    8

    9

    10

    11

    12

    14

    15

    R73.9k

    B1

    B2

    B3

    B4

    B5

    B6

    B7

    B8

    VR

    VR

    V

    V

    IOUT

    COMP

    VLC

    IC1DAC08

    13

    12V

    C1100 nF

    4

    2

    16

    1

    J1

    J2

    C3100 nF

    3

    2

    12V

    8

    12V

    4

    _

    +

    R1A1M

    R1B6.49k0.1%

    3

    12V

    C7100 nF

    IC2AOP270

    C2100 nF

    R31k

    R4100k

    C5100 nF

    C4100 nF

    R56.2k

    C610 nF

    R1030.1k0.1%

    R111k

    0.1%

    R8A10

    0.1%

    R8B10

    0.1%

    7 IC2BOP270

    Q2MMBT2222A

    1

    5

    6

    DIGITALINPUTS

    Q1STD8N06L

    IOUT

    F igure 1

    This digitally programmable resistor features low component count and inexpensive parts.