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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Wien Bridge Oscillator MC1776 (CB4498E)
The integrated circuit used in this project is not common today, but it can be implemented with more...
Digital signal isolator (CB8021E)
Found in an American publication from 1969, this circuit can be adapted to be used as a shield....
Ammeter (CB9660E)
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