Double limit comparator (CB9581E)

Found in documentation from the 1980s, this circuit makes use of general-purpose diodes and requires a symmetrical power supply.

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Bell Sound (CB1492E)
This circuit generates the sound of bells. We found it in a 1977 Radio Shack publication. The...
The Transistor as Switch (CB922E)
This circuit can be used as shield or to drive powerful loads from low current switches such as...
PUT Battery Charger (CB4256E)
We find this automatic battery charger in an 80s ON Semiconductor circuit and application manual. Bridge...