Found in a 1966 Electronics World, this circuit applies to the protection of any analog instrument. The diodes can be of any general-purpose type.
This 80's circuit uses a light-sensitive SCR or LASCR and a one-sided silicon switch SUS, uncommon...
We found this circuit in an old documentation, using an operational of the time. The circuit...
The figure shows how to implement an amplifier with gain 10 using the operational amplifier LM41....