Saturday, July 26, 2014

What is a Relay - Jim Asks

(A text chat in Google talk long ago from my email records - 2007)

Jim: hello, anantha.
delabs: hello

Jim: i have a Small problem,it's about would u pls give me an information about relays,pls give different types of relays and their differences.

delabs: for what do you want to use

What is a Relay - Jim Asks

"A Relay is an electrically operated switch. Many relays use an electromagnet to mechanically operate a switch, but other operating principles are also used, such as solid-state relays" - Wikipedia

Jim: Two door alarm settable for close or open door

delabs: there is a control signal and an output for relay, if you are using just a buzzer for alarm, no relay needed if you want to operate a big hooter or 230V lamp a relay is needed- or even a motor or solenoid to move some thing  Even a Solid State Relay can be used.

"A relay is an electrically operated switch. Current flowing through the coil of the relay creates a magnetic field which attracts a lever and changes the switch contacts." -

Soldermans Basic Electronics: Relays and Contactors

Jim: let me check dis addr nd i'll get back 2 u just now.

Relays and Relay Drivers Tutorial - Tony van Roon (VA3AVR)

Jim: ok but if i have a problem i'll get back 2 u,bye