@ahmedadelhosni said:
My questions:
- Is this normal ? Would that affect the Atmega and other components ?
- How to avoid this ?
This is a matter of reference. When you have a power source with no contact to any othe rreference you are safe to touche one contact of that power source. If you make contact to the other one, you would be a resistor to the power source and act as esistor, having current runningthrough your body with all the negative impacts, including chance of death.
As explained, that is a matter of the reference. When you use a transformator, where secondary is not connected to anything else, you could safely make contact. In case you use any transfromless design, everything is somehow connected to mains. You are connected to grounds, so touching anything would be dangerous. As long as you do not touch anything, you are safe.
In fact a lot of electronics is tranformless with enough and safe insulation around it, so that no contact to grounds is possible. It is not only affecting persnal health, but could also be a source of fire if there could leak any current to grounds or mains from that circuitry. That's the reaosn for the insulation.
In fact this applies to transformators as well, as the primay side has contact to grounds.
So, it does not affect any Atmel or so, it just raises the level of security precautions you have to take care of for this type of circuitry.
