I need 32khz for a project.
Thinking this would be simple I breadboarded a circuit using first a 74hc00 nand, then a 4000 series nand.
Cant get the bloomin thing to oscillate, tried various load capacitances and a 10 meg resistor across the inverter, as well as a resistor in series with the xtal from from 0 to 220k.
The load capacitance for watch crystals is 30pf.
So as a last resort I tried a 4060 which has a dedicated oscillator, and it works perfectly, with or without load capacitance.
So what is different about the nand gate oscillator within the 'hc4060 and a 'hc00 nand?
Thinking this would be simple I breadboarded a circuit using first a 74hc00 nand, then a 4000 series nand.
Cant get the bloomin thing to oscillate, tried various load capacitances and a 10 meg resistor across the inverter, as well as a resistor in series with the xtal from from 0 to 220k.
The load capacitance for watch crystals is 30pf.
So as a last resort I tried a 4060 which has a dedicated oscillator, and it works perfectly, with or without load capacitance.
So what is different about the nand gate oscillator within the 'hc4060 and a 'hc00 nand?
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