RIAA preamplifier (T373E)

This preamplifier for magnetic phonocaptor was found in the 1961 RCA tube manual. The same circuit appears in manuals from other times.

Negative Peak Detector (CB3948E)
We find this circuit in a 1970s documentation on operational amplifiers. The setup is true for...
AQZ Series High Capacity Photo Relays
June 2017 - Mouser's new AQZ series solid state relays with switching capacity from 5A to 200V are now...
LED driver (CB20550E)
Found in the documentation on PCs, this circuit excites LEDs whose current is determined by R3....