Hey, I have this schematic for a keyboard amp that I am going to build. In it there are resistors labeled as follows:

R44 FU 1/4W 4.7

R63 NF 1/2W 1K

What is the NF and FU supposed to mean?

 

I can't access the schematic. But it might have to do with "fusing" and "non-flammable".


John

 

Usually you specify this type of resistor when you want to ensure a failure mode will not cause a resistor to catch fire

Look at Phoenix Passives for some example parts:

http://www.phoenixpassives.com/

I have used them on some designs.