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If you start with any 20MHZ square wave oscillator, no mater what the duty cycle, and pass it through an edge triggered flip-flop you will end up with a 10MHZ square wave with a perfect 50% duty cycle. Just use a crystal oscillator. To be even more accurate you could start with a 2560MHZ...
The LM324 will not allow you to get 4V output with a 5v rail.
From the data sheet - Large output voltage swing 0V to V+ − 1.5V.
You would only get 3.5V.
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