Circuits built around a CD 4013: The CD 4013 can be used as a frequency divider in which the output is half the input frequency. It can also be used in TOGGLE MODE (this is exactly the same as a frequency divider) where the output toggles ON then OFF after each clock (input pulse). This is exactly the same as a FLIP FLOP or MEMORY CELL. The following circuit shows two flip flops creating a "divide-by-four." The output Q is taken to Data input. Note: this did not work for a Philips surface-mount CD4013BT IC. The output Q had to be delayed with a 2k2 and 1u electrolytic as shown in the second diagram.
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