Tag Archives: Coil

Understanding Relay Coil Voltage Specifications

by Robert_Fay @ digikey.com:

When learning about relays there are a couple coil voltage specifications that can be a little tricky to understand. There are typically 4 specification for coil voltage listed in the datasheet. For this example we will be looking at relay part Z2352-ND 14. This is a SPST non-latching relay with 1 Form A (normally open) set of contacts.

Understanding Relay Coil Voltage Specifications – [Link]

USB powered – PCB TeslaCoil

Daniel Eindhoven build a usb powered Teslacoil able to produce small sparks. The coil of the device is printed on the board!

A new and improved PCB spiral Teslacoil. This Teslacoil has etched windings on a print circuit board. It has a USB interface which also powers the coil. The resonance frequency is about 4MHz. It has a turns ratio of 1:160 with 6mil tracks for the secondary. The total trace length of the secondary is 25m.

USB powered – PCB TeslaCoil – [Link]

Contactless payment ring – A tutorial on NFC antenna coil design

Jatinder has tipped us with this latest post. He writes:

 I have a done a video about a contactless payment (NFC) ring that I have made. The video talks about NFC antenna coil design and how I used the concepts to make the wearable ring.

Contactless payment ring – A tutorial on NFC antenna coil design – [Link]