I have a PLL set up using a CD4046BE (PC2) connected to 2 x CD4017 decade counters to enable a x100 multiplier.
My input frequency range is 1Khz to 5Khz and I want to output 100Khz to 500Khz .
I have applied a few examples x10 schematics using 1x CD4017 which have worked well so my circuit is ok but it is the selection of resistor values and cap values for my low pass filter and VCO which I can't get right. I tried using some formulas and tables for the CD4046 but my math isn't great and the values I've tried haven't worked.
I have added my circuit with R & C values which enabled me to multiply an input of 1.2- 3.9Khz to 120-390Khz.