Junebug + external power source

[UTMonkey]

Hi All,

I am pretty certain this has been asked before but I cannot find the post.

The last few of my projects are breadboard based using the Junebug to program and debug, what would happen if I attach an external 5 volts to the breadboard power rails whilst having 5V supplied from the Junebug?

Would I need to detach the 5V line from the Junebug?

Regards

Mark

 

[blueroomelectronics]

Nope, you might get some trickle current from your targets 5V supply but it won't hurt the Junebug. The 1N5817 diode on the Junebug is designed to block external DC(the +5V ICD pin) from powering the Junebug.

 

[UTMonkey]

Great thanks.

 

[UTMonkey]

Just thinking though, wouldnt 5V from the junebug and the 5V provided via the breadboard source equal 10V = (KVL)? or is it 5V parallel?

my electronics theory is very shaky....

 

[binzer]

Just thinking though, wouldnt 5V from the junebug and the 5V provided via the breadboard source equal 10V = (KVL)? or is it 5V parallel?
my electronics theory is very shaky....

It would be in parallel with the existing 5v source, like Bill said there is a blocking diode to eliminate back feeding to the Junebug.

 

[Kryten]

And they have the same ground referance