Discrete voltage amplifying adjustment circuit

摘要

The circuit includes several operational amplifiers (OP3,OP4) whose number corresponds to the discrete stages. Each amplifier is allocated resistors (R1,R2) for forming, together with the operational amplifier, a discrete amplification stage. The circuit also includes a comparator (OP5), resistors (R3,R4), transistors (T1,T2) and an inverter (I1) for activating the operational amplifier with the required amplification. Preferably a particular operational amplifier is disconnected by disconnecting the current to its output differential amplifier, using a transistor as a switch.