What Is Amplifier?
                     What Is 
Amplifier?
Amplifier is a device that boosts the 
strength of a signal. In industrial 
automation, amplifiers are used to 
enhance the control signals that 
govern the operation of various 
components such as motors, valves, 
actuators, and sensors. 
Types of Amplifiers in Industrial 
Automation
Voltage Current Power Operationa
Amplifiers Amplifiers Amplifiers l Amplifiers (Op-Amps)
1. Voltage 
Amplifiers 
 These amplify control 
signals by increasing their 
voltage levels. They are 
commonly used for driving 
motors, actuators, and 
other devices that require 
voltage-controlled inputs.
2. Current 
Amplifiers
• Current amplifiers boost the 
current levels of control 
signals, making them 
suitable for applications 
where devices require 
current-controlled inputs, 
such as solenoid valves and 
heating elements.
3. Power 
Amplifiers
• Power amplifiers are 
capable of amplifying both 
voltage and current 
simultaneously, providing 
high-power output for 
driving heavy-duty devices 
like industrial motors and 
hydraulic systems.
4. Operational 
Amplifiers(Op-
Amps)
• Op-amps are versatile amplifiers 
used for various signal 
processing tasks, including 
amplification, filtering, and 
signal conditioning. They find 
applications in feedback control 
systems, instrumentation, and 
sensor interfaces.