SL531 Overview
The SL531 transfer characteristic has two regions For small input signals it has a nominal gain of 10 dB. at large signals the gain falls to unity (see Fig 7) This is achieved by operating a limiting amplifier and a unity gain amplifier in parallel (see Fig 3) Tr1 and Tr4 prise the long tailed pair limiting amplifier, the tail current being supplied byTrS, see Fig 2 Tr2 and Tr3 form the unity gain amplifier the gain...
