How to solve earth and hum noises in amplifier?

in this video giving a detailed description of noises found in amplifiers their causes and remedies
it will be helpful for beginners
These all problems are faced by myself while assembling amplifiers
i have given deatiled sollutions for all these
i didnt used any scientific terms here
ellavarkkum pettennu manasilakan vendiyanu najn pareekshichu bhalam kanda chila tips anu ellam...
#technicalevolution #amplifiers #earthnoises