@ Ronsimpson
According to the ROHM data book on the BH1414K IC chip, it says:
Quote: for example, to set the pre-emphasis to 50us, make C2 = 1000pF, R1 = 51K Ohm and R2 = 10 K Ohm.
The numbers you used above in my map would result in 50us pre-emphasis, not 75us, which is what I am trying to set the pre-emphasis to.
Please see these images below that back up my point these images were photographed from the ROHM Co. manual for the BH1414K chip.
Read what it says above the graph.
Those values you gave me would result in 50 microsecond pre-emphasis if the ROHM data book is correct. I need 75 microseconds not 50 microseconds.
Or perhaps you were just providing what the current values are on my circuit board, then I can understand, that it is set to 50us and changing those 1000pF caps to 1500pF would in fact change it to 75us, is this correct?
Bruce.