We found this circuit in a 1964 Electronic Design. The components are from that time, but the circuit can be made with modern equivalent components.
ON Semiconductor CMOS Operational Amplifiers Mouser Electronics announces the availability of ON...
An OR gate can be improvised using NAND gates of a 4001 as shown here. The diodes are...
This circuit was found in a 1991 publication. The transistor can be a general-purpose type....