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Power Supply & Batteries
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Topic starter
2021-02-23 12:02 am
I have a wall wart that is marked as 9V DC output and 300mA. I used it to power a simple circuit on a breadboard with a DC barrel jack. I connected my multimeter to +ve and ground pins of the barrel jack and got a reading of 15V. Is there a chance (likely!) that I'm doing something wrong or misunderstanding something, or should I not trust this wall wart?
The circuit is a slide switch, a resistor and an LED.
Thanks
2021-02-23 4:52 am
I'm not the circuit guy but ya voltage drops on load.. not sure about 330mA dropping 6 volts tho..
Topic starter
2021-02-23 12:25 pm
It says "9V 330mA", so who knows what miracles may occur! 😀
2021-02-23 1:18 pm
They are regulated so it should be 9v from no load to 330 ma.
2021-02-23 10:46 pm
If your power supply is not regulated and you have no load than it can happen that the output voltage is much higher than the nominal. But try to have a load with p.e. 100 mA ( a power resistor with 100 Ohm and 2 W) and check the voltage again. One question is: did your LED get bright with the 14 V OUTPUT?
Topic starter
2021-02-23 11:08 pm
The LED did get bright.