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.

12V Battery Charger LM117 (CB15178E)
The current of this charger is determined by Rs. The circuit is from the 1982 SGS linear...
Diode Switch (CB4112E)
This circuit is used to connect an additional capacitor to a tuned circuit of a VFO. The circuit...
Alarm with Battery Charger (CB16827E)
This alarm does not interrupt its operation when the power is cut. A battery is kept at a constant...