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.

Darlington Push Pull Stage (CB6971E)
This circuit was suggested by Popular Elecronics from the 90's. The circuit has high input...
RC Time Circuit (MSB026)
Figure 1 shows a circuit than can be used as time stage in timers, and other applications....
Peak Voltage Detector (CB10628E)
This circuit is from a Popular Electronics from 1993. The magazine is no longer printed, but the...