Process control interface (CB7831E)

This shield was found in a 90’s Popular Electronics. The circuit can be implemented with modern equivalent circuits.

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Zener triggering (CB21472E)
The purpose of this circuit is to improve a trigger circuit using a zener diode. The circuit was...
Exclusive NOR function with the 4011 (CB16070E)
The Exclusive-NOR function can be achieved simply by adding one more NAND gate as an inverter to...
Infrared modulated transmitter (CB7247E)
This simple Philips circuit from the 1960s can use any general-purpose transistor. The signal is...