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.

Operational Amplifier Gain Tester (CB25096E)
This simple operational amplifier tester was published in the November 1987 issue of Radio...
TBA810 7W amplifier (CB10901E)
The traditional circuit was taken from a French magazine Radio Plans that no longer exists but can...
Second Order Low Pass Filter MC34071 (CB14488E)
This configuration can be made based on other operational amplifiers. For other frequencies, the...