help please

L

lost_alone

New Member

• May 22, 2010

• #1

Hi all,
i have a problem that i have an electronic circuit powered with 5 dcV.
when i connect adapter 5 dcV and measure input socket voltage it reads only 0.94 dcV why this drop occurs ?
please help
thanks alot
goodbye

Alaa

 

B

BrownOut

Banned

• May 22, 2010

• #2

Could be defective power adaptor
Could be defective voltmeter
Could be defective circuit

 

3

3lectrokid

Member

• May 22, 2010

• #3

The the power supply with only the voltmeter attached. make sure its on DC and not AC. if the reading is 5v there could be a direct short in your circuit or a very, very small value resistor across the rails

 

Reloadron

Well-Known Member

Most Helpful Member

• May 22, 2010

• #4

Another possible is if you have an adapter that delivers 5 Volts at 300 mA and your load requires 5 volts at maybe 500 mA you are loading down the adapter. That assumes you are measuring the voltage with the adapter connected to the load. Did you measure the adapter voltage with or without the load connected?

Ron

 

L

lost_alone

New Member

• May 23, 2010

• #5

Thanks All

Many thanks all,
i measured the adapter voltage it's 5 dcV ( it's the original adapter of that circuit ) and i tested it on another working circuit it works good.
lol i know there is a defective in the circuit but what's it ?
Best Regards,
Alaa

 

3

3lectrokid

Member

• May 23, 2010

• #6

can we please see the circuit