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What can't you use a 555 for? :)
The switches are only to keep the layout tidy.
Top row, left to right:
* nand
* nand and
* A and (not B), (not A) nor B [equivalent]
* nor (resistors should be the same ±30%)
* not
Row 2, left to right:
* S-R flip-flop, S input inverted
* S-R flip-flop, both inputs inverted
(FIXED)
* D flip-flop with not-Q output only.
Level-triggered unlike EC's
edge-triggered flip-flop.
With a 9V supply, logic high is 7.5V.
Fan-out should be good, 555s can source or sink 200mA. It will be lower when driving nor gates and D flip-flops. Fan-out may be traded for speed by changing the resistor values. I haven't tried to pick good resistor values.
At 2mA a gate, power draw is very high for digital logic. This is why I included the multi-gate and flip-flop circuits.
It's probably quite slow.
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