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That is what the RC does.The output of U8 pin#6 , the shark fin waveshape goes to U10 pin#6 SET input
Why is the waveshape a sharks fin? the RC network changed the waveshape from a square waveform to a shark fin
To produce a time delay.But why was this waveshape used?
We need to see the rest of the circuit to answer those questions.Do you know why the time delay was used? for what reason?Does the waveshape trigger the flip flop differently than a square waveform?Why would the logic signal source need to have a time delay RC network or a waveshaped to be triangle or shark fin to the inputs of a GATE or flip flop, etc?
that means the three input 'NOR' gate actually functions as a negative logic 'NAND' gate
What do you mean how a NOR gate is functioned like a negative logic NAND gate, how so ? and why did the designer do this? Instead of using a NAND gate, because he used a NOR gate, why didn't the designer just use a NAND gate?
to invert a clock signal, one is to create a two phase clock signal from a signal phase clock signal.