I have been quiet as I have been learning ltspice.........That seems to be a rather complex circuit for frequency doubling.
But you should be able to get it to work at a lower frequency by increasing the value of capacitors C1 and C2.
Below is the LTspice simulation of a simple frequency-doubler circuit using one CD4070 XOR gate, one resistor, and one capacitor.
View attachment 150507
See the attached files.Where do I go to get the ltspice models for the CD4070 and the 4069?
Press F4 when in the schematic window.I have spent a long time running in google-circles trying to understand .net and and create the Vdd.
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