Rotary Switches Flashcards
What do rotary switches do?
Rotary switches allow multiple circuit paths to be selected by rotating a knob or lever.
How do rotary switches work?
They use a rotating contact arm to connect a common terminal to one of several output terminals.
What are the main types of rotary switches?
Single-pole multi-throw (SPMT), dual-pole multi-throw (DPMT), and multi-deck switches.
What is a single-pole rotary switch?
A switch that controls one circuit and can connect it to multiple outputs.
What is a multi-deck rotary switch?
A switch with multiple layers (decks) that control multiple circuits simultaneously.
What is the difference between shorting and non-shorting rotary switches?
Shorting switches momentarily connect two positions during rotation, while non-shorting switches break the connection before making the next one.
What is the typical application of a rotary switch?
Used in devices like audio equipment, multimeters, and industrial controls to select modes or settings.
What materials are commonly used in rotary switches?
Plastic or metal housings, with conductive metal contacts.
What are the typical voltage and current ratings for rotary switches?
Voltage ratings range from 12V to 250V, and current ratings range from 0.5A to 10A.
What is the role of detents in a rotary switch?
Detents provide tactile feedback and ensure the switch stays securely in each position.
What is a rotary DIP switch?
A compact rotary switch with a dual-in-line package, used for configuration settings.
How do you use a rotary switch in a circuit?
Connect the common terminal to the input and the output terminals to different circuit paths.
What is the maximum number of positions a rotary switch can have?
It depends on the design, but typical switches range from 2 to 12 positions.
What is a multi-position rotary switch?
A switch that allows selection between multiple circuit paths or modes.
What is a rotary encoder, and how does it differ from a rotary switch?
A rotary encoder generates digital signals to indicate position, while a rotary switch mechanically connects circuits.
What are common problems with rotary switches?
Wear and tear on contacts, dirt accumulation, and mechanical failure.
How can you maintain a rotary switch?
Keep it clean, avoid excessive force, and use within its rated limits.
What is a keylock rotary switch?
A rotary switch operated with a key, providing security for restricted access.
What is a cam-operated rotary switch?
A switch that uses a cam mechanism to control the sequence of contact connections.
How do you test a rotary switch?
Use a multimeter to check continuity between the common terminal and output terminals.
What is a waterproof rotary switch?
A switch with an IP rating designed for use in wet or harsh environments.
What is the significance of a rotary switch’s throw angle?
It determines the angle between each selectable position, affecting ease of use and precision.
What is a spring-return rotary switch?
A switch that automatically returns to its original position after being released.
What are rotary wafer switches?
Multi-layer rotary switches where each wafer handles a separate set of contacts.
What is a common failure mode for rotary switches?
Contact wear, leading to poor conductivity or intermittent connections.
What is a military-grade rotary switch?
A robust switch designed to meet strict durability and reliability standards for military applications.
What is a rotary selector switch?
A switch used to select between various operational modes or settings, common in industrial equipment.
How do you replace a rotary switch?
Disconnect the circuit, unscrew the old switch, and install a new one with matching specifications.
What is the role of an anti-rotation tab in a rotary switch?
It prevents the switch from rotating in its mounting, ensuring secure installation.
How do you prevent accidental switching in a rotary switch?
Use a locking mechanism or a switch with firm detents to secure positions.
