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Stable as a function of what: Temperature? Supply voltage? Component aging?I need a circuit that varies 10:1 in frequency and stays frequency stable, less than 1%, and the duty cycle needs to be 50.0%. I know the diode modification to the 555 for 50% DC but would it be an accurate 50%. Less than 1% is what I'm going for. I know about crystals but I don't have one on hand right now.