Linear Ohmmeter LM11 and TL431 (CB14548E)

We found this circuit in Motorola's Linear Databook in 1990. Integrated circuits are somewhat difficult to obtain today.

ESD122 ESD Protection Diodes - Texas Instruments
Texas Instruments ESD122 Electrostatic Discharge Diodes (ESD) can be ordered from Mouser...
Alternating flashing green and red LED (CB24664E)
This alternating flashing system uses two-color LEDs. The circuit is from a Radio Electronics...
Diodes & Fuses Test (CB4536E)
I found this simple circuit from an English magazine from 1984. The circuit can be easily...