Using an op amp as a voltage comparator - #41 by AKRichard - General Electronics - Arduino Forum
single transistor as a comparator?? : r/AskElectronics
Design of PWM with four transistor comparator for DC–DC boost converters - ScienceDirect
Voltage comparator with NPN transistor - Multisim Live
The Bell System technical journal . REFERENCEI LEVEL -I ADJUSTMENT i+ Fig. 18 — Simplified circuit diagram of voltage comparator.. Fig. 19 — Equivalent circuit of voltage comparator. TRANSISTOR CIRCUITS FOR