AT89S51 CMOS 8 bit Microcontroller in Pakistan

A comparator is a device that compares two voltages or currents and outputs a digital signal indicating which is larger. The LM2901N devices consist of four independent voltage comparators that are designed to operate from a single power supply over a wide range of voltages. Operation from dual supplies also is possible, as long as the difference between the two supplies is 2 V to 36 V, and VCC is at least 1.5 V more positive than the input common-mode voltage. The current drain is independent of the supply voltage. The outputs can be connected to other open-collector outputs to achieve wired-AND relationships.

The ULN2003 is an array of seven NPN Darlington transistors capable of 500mA, 50V output. ULN2003 features are common-cathode flyback diodes for switching inductive loads. It can come in PDIP, SOIC, SOP, or TSSOP packaging In the same family are ULN2002A, ULN2004A, as well as ULQ2003A and ULQ2004A, designed for different logic input levels.