Bias circuit question.

[joesatch]

typical plexi style bias circuit. What resistor would i change below if more negative bias voltage is needed?

[thetragichero]

decrease r54 or install a resistor between p1 and ground (this second one is a better idea to me because then you remove the possibility of turning the bias voltage all the way down to zero. maybe it's me but i try to make things as "idiot proof" as possible)

[sluckey]

A lot of people refer to R63 as the "bias range" resistor. Decrease size for more negative voltage.

Decreasing R54 will result in LESS negative voltage. There is no danger of reducing the negative voltage to zero with the circuit as is.

[thetragichero]

ahhh picture is missing the top which would show bias voltage being taken from the junction of r54 and r59. my bad, see above correct answer

[nandrewjackson]

+1 for decrease R63