• Welcome to our site! Electro Tech is an online community (with over 170,000 members) who enjoy talking about and building electronic circuits, projects and gadgets. To participate you need to register. Registration is free. Click here to register now.

What is this, and what does it do?

Inquisitive

Super Moderator
Hi Craig,

Welcome to ETO.

Any numbers on the unseen side or markings?
 

gophert

Well-Known Member
Most Helpful Member
Looks like a transformer to me. What does the bottom look like Each wire should have a partner (other end) that you should be able to determine with an ohm meter There may be four different wires (up to eight connections from photo)
 

rjenkinsgb

Well-Known Member
Most Helpful Member
Most likely an inductor of some sort, from the shape.

At a guess, a common-mode choke in line with a power input connection - though there are various other possibilities, without seeing how it is interconnected with the rest of the circuit.
 

rjenkinsgb

Well-Known Member
Most Helpful Member
It looks like it was a common mode choke, a bifilar wound one. The tracking on the circuit board should confirm that, two connections in and two out, with one side connecting to a power input.

They are typically used for interference suppression, to reduce electrical noise passed back through power cables, that could otherwise act something like antennas.

That one has a toroidal core inside the casing. Without the case it would look rather like the one at the left of this photo:



More about them, in general.
 

Latest threads

EE World Online Articles

Loading
Top