Switching circuit (CB9226E)

This circuit was found in a 90's EDN. It can be implemented with either TTL or CMOS logic and used as a shield.

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Voltage Controlled Ramp Generator with PUT (CB1539E)
We find this circuit in a 1974 Motorola PUTs (Unijunction Programmable Transistors) documentation. The circuit...
Digital Timed Lock (CB17519E)
This circuit releases a lock only if the correct 4-digit sequence is entered. The circuit uses...
Multivibrator Flashers (CB4254E)
This alternating flasher was found in a 1980s documentation. The transistors may be equivalent such...