I am working on a power supply "freehand" no manual so am searching for value clues from the internet of similar designs and come across a reference I am unsure of:-

A resistor that is marked 2E along with other resistors ending with the "E" prefix if anyone can help me that would be great....

Many Thanks from David

 

Good close up pictures would help.

Normally there would be 2digits + a letter so 02E would be 1.02Mohm (SMD Resistor marking), but 2E is unusual. Are you sure its a resistor and not some other device? It could be an SMD Fuse, 2E might be 2A slow blow. It could also be a zener diode.

 

The marking I describe is Not on the device (which is a blown up smd about 8 to 1206 size) its on a circuit diagram, along with other similar resistor markings like 4.7E etc, my feeling and logic in respect of circuit positions is its R but I want to be sure.

Thank you so far

David

 

Oh right. On the schematic it almost certainly means "ohm".

 

Yes I feel that it would be but I tend to be a bit dogged to find the answer to what E stands for, Epsilon or some other word??

Thank you for your help.

David

 

E = Ohms.

 

To cover all bases I asked RS for a view on on this below is part of their response :-

Dear David.

Thank you for your recent enquiry.

For resistors E can be the same as Ω. It is often used in case of high power resistors (power not being less than 5W). Sometimes you can see R written instead of E.
We are however unable to determine the ohms or power rating of the required resistor form an E2 reference.

So from this I accept that "E" = "R" my only thought is who started it and why? one day may learn......

Thank you for your help

David