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 independently 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.
