jol50 said:Also make sure your bench or anything the radio could touch is not grounded.
cliff said:
The radio chassis will be grounded, and powered from the negative side of the supply.
There is no need to worry about isolation.
Perhaps you are thinking of a situation using a supply with the negative already grounded? Or putting the radio in a vehicle with a negative ground battery? THEN you will have problems!
However when connecting 2 or more things together, and for electrical safety, it becomes important.