Dark activated switch with hysteresis (CB7871E)

Found in a 90s American documentation, this circuit can be used as a shield, just change the coupler for one that uses a phototransistor.

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CMOS Frequency Meter Up to 12 MHz (CB13726E)
We found this frequency meter circuit in a 1974 documentation. The circuit is powered by 12 V and...
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Electronic Dice (CB4877E)
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