Thread: 3.3V Biasing
View Single Post
Old November 30th, 2006   #2
Nigel Worsley
Junior Member
Join Date: Jun 2006
Location: London
Posts: 13

Change Rt1 to 150R and R1, R2 to 390R.

This gives almost exactly the same bias voltage, and is reasonably close to the 120R impedance requirement ( 126R ). Using difficult to obtain ( in small quantities ) values could provide a slightly closer match, but there is little point as the cable impedance will probably vary by far more than this anyway.
Nigel Worsley is offline   Reply With Quote