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Alright George that’s all explained in the beginners guide to components on the guides page here


The letter is used instead of a decimal point which can often be missed, it’s used mainly for capacitor and resistor values and sometimes for potentiometer values

2K2 for example would be a 2.2 kilo ohm resistor 4N7 a 4.7 nf film capacitor and 2U2 a 2.2 uf electrolytic capacitor

As you can see with the decimal points above it could be easily missed especially on schematics and parts lists