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[SOLVED] 2 power supply LED power indicator

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nbrand86

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Untitled.png

The above schematic is suggested for an LED indicator for separate 2 power supplies.
But looks like it is gonna light up both LEDs with one source. any good suggestion will be appreciated.

Corrected Diagram

Untitled.png
 
Last edited:

just put a diode in the dc source arm , see the pic below

untitled.JPG

well , you have not mentioned the ac power level , if it is low you can use 1N4007 diode or find some proper rating diode ...

Hope it helped :)
 

what the diode will do is , let the current through the dc arm but not the ac arm when the switch is changed to other mode . . .
 

:pH said:
what the diode will do is , let the current through the dc arm but not the ac arm when the switch is changed to other mode . . .
Click to expand...

I aplogize about the lack of information. And both of the power sources are dc. The ac one comes through an adapter.
I was exepecting the diode reply and that's the same thing I tried practically in this circuit. But may be due to the higher current or some reason, one of the diodes got melted.
Since the diodes make a voltage drop then I tried p-channel mosfets. I am not confident abt mosfets and even the circuit didn't work as expected.
please help me to figure out the best solution.

N.B :
*Both sources are DC
*max current drw 20 amp
*just need to light the LED corresponding to the source selection
 

As :pH has already pointed out... we have no idea what could be the difference between Vbatt and Vpwr.

For instance, if Vbatt and Vpwr have almost the same dc voltage and Vpwr has very low ripple then you will need using the two non-connected terminals of the DTDP switch.

Kerim
 

nbrand86 said:
The above schematic is suggested for an LED indicator for separate 2 power supplies.
But looks like it is gonna light up both LEDs with one source. any good suggestion will be appreciated.
Click to expand...
If you turn the switch around, you can use one pole to select the power source and the other pole to switch the LEDs. No need for any extra components.

2-pole.png
 
Last edited:
godfreyl said:
If you turn the switch around, you can use one pole to select the power source and the other pole to switch the LEDs. No need for any extra components.

Click to expand...
Hello please modify the diagram saying .....adapter...no wall some newbie may thing its 230vac from wall and try to make your circuit. remember i search for circuits in here and get a lot of error diagrams so will others.
 

dselec said:
Hello please modify the diagram saying .....adapter...no wall some newbie may thing its 230vac from wall and try to make your circuit. remember i search for circuits in here and get a lot of error diagrams so will others.
Click to expand...

Sure. I apologize for the mistake. It is corrected and posted in the beginning of the thread
 

I AM DOING M.E(PC&I)

in order finish my project within "may 20"

can any one help me to download the files from www.pudn.com

the topic is " NLJ OPTIMIZATION"

PLEASE HELP ME
 

Thanks for the correction
but please every body could edit and repair or delete the wrong diagram it would make sure no body could make a mistake remember next time u may search something and get a bad diagram
thanks
 

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