modified 11 years ago

Dc Ac indicator improved

00:45:54

It indicates DC(RED LED) and AC(BLUE LED). Can someone find out how to turn the stupid DC LED "off" it is still "on" when it's AC? 

published 11 years ago

rbrtkurtz

11 years ago

I think you were closer with the first design. The biggest problem I think you're going to run into is getting it to work properly from a low voltage range to a high voltage range without changing anything. Do it like a multimeter. Send the signal through one channel for, say, 2-20V, then another for 20-200V. The problem is if you only set it up so the 120V isn't blowing stuff up, there's too much resistance for low voltage to turn on the transistors. If you only set it up so low voltage will turn on the transistors, then if you put high voltage to it, stuff will blow up.

januszwieja

11 years ago

30 years ago it was getting easier. Check out my system ac-dc indicator

Voltransistor

11 years ago

@rbrtkurtz-Thankyou! You are right. I try to regulate it, so any voltage would work, but then it can't work when it's the wrong function. @januszwieja-Thankyou! I will.

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