Hi Mike
Can anyone tell me the values of the voltage divider resistors biasing LED varicap in the schematic on this page?
I think the upper resistor is 33k but have no clue what the grounded one is.
Even I can't tell you that, sorry :-( Looks like I shrunk that diagram too much. The good news is that the values are entirely non critical. You could try with 33k in both positions to start with. I believe I chose the values in haste. It was merely to achieve, together with the 100K resistor to the 4-bit digital-to-analogue converter, the right amount of shift that I wanted. No magic to it. I think it's just a matter of playing with the values until you get the shift amount you want, subject to the component tolerances and LED characteristics you have in your circuit.
73 Hans G0UPL
