Power supply by a 3.5mm jack

[georgz]

Hi i want to power my board using a jack. Do i need a protection circuit or any additional circuit??
I dont know what will happen if i, during the connection, touch the ground which is first on the female jack with the 5 volts which is also first on the male connector.

 

[wp100]

Hi,

Not the best way to connect any psu to a circuit.

Use a low cost Power Plug and Socket designed to avoid just that problem **broken link removed**

 

[georgz]

I chose this connector because of it's shape, i can turn the connector without losing connection. I might use a power jack or a switch and turn it on after i plug it.

 

[BradtheRad]

It sounds as though you're using a phone plug design. If you touch the +5V tip, by itself, to the board ground, it should not be damaging. You're not creating a circuit at that instant.

Notice that you can short circuit your incoming power using a phone plug. This happens momentarily if both the plug tip and barrel contact the ground ring.

A coaxial power plug is typically used (see link in post #2). Like a phone plug it also can be rotated without losing connection.