This 80's General Electric circuit is guarded by the noise-guard for operating current. The circuit has an input sensitivity of 3 pA. The font must be symmetrical.
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....