[SOLVED] [Moved] can lm7805 be used for electrical isolation

[at89atbits]

Hi,
i need to provide electrical isolation from the power supply network in my design.
however i am powering the circuit from usb port of laptop.
so even then is electrical isolation necessary?
can a normal voltage regulator such as lm7805 be used for such purpose?

 

[zsolt1]

hi,
LM7805 does not provide any isolation .The cip is a series voltage regulator. What do you isolate from what ? If you power your circuit from 220 or 110 ac. you use a transformer. If you use your laptop, there is no need for that , you can use the 5Vdc from the usb port. Just be careful to not overload it (& of course no short circuit, the port is protected , but still... ). The charger of your laptop provides all necessary safety requirements.

 

[at89atbits]

oh cool!
thank you