ADWSystems
Member
I'm heading down the path to building the Hacker's Bench CD4060 based 1Hz oscillator. Part of the design includes a 32.768 crystal and 33pF capacitors. How were those values derived? The 32.768kHz crystal is obvious, but what of the 33pF capacitors? In looking for the 32768kHz crystal I found to available through Jameco. One with 12.5pF impedence and one with 10.5pF. What is the impact of the different impedences? Which one would be correct for this application?