Hi everybody !
I am building a project ( power supply , 5 V and I = 100 mA , I am a newbie ) I have a problem about measuring current .The first , I test current as figure
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Measuring current is about 25 mA , then , I don't connect led , repeating measure current as figure ( about 30 mA )
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Because I want to have full current ( 100 mA ) , I connect series a darlington stage using a couple C1815 transistor as figure , after , I test current , but only 30 mA .I don't know what is happening ,althoght I connect three darlington stage , the current is very small ...I also add a darington ( using couple C535 ) into circuit , but the result is same ( about 30 mA )
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My multimeter have error or my way is not good or ... , I don't know the reason and what must I do to solve this proplem ? I hope all my friends can help me solve this proplem .
Thank you very much !