Notes:
Using two gates from a CMOS 4011 NAND chip, a simple
aquarewave oscillator can br made. Alternatively a CMOS 4001 chip can also
be used, or a TTL equivalent. In this circuit the mark space ratio
can also be independantly controlled by varying the value of the resistors.
The rise and fall times of the output pulses depend on the operating voltage
of the IC and type of IC, but will be typically in
the order on tens of nanoseconds.
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