i have a problem with an LED. i need to attach it to a project. the first schematic works perfectly. the LED lights up and the batteries are fine.
but the second one causes the batteries to over heat and the LED does not light up.
i need an LED attached to this project to be able to tell when it's on or off. there's some sort of problem here but i don't know what's wrong.
the 2nd circuit works perfectly without the part that i drew and pasted in.
In the 2nd, you have the outputs set up as emitter followers.
What is the current rating on the elements? The outputs look to be rated for 200mA.
Is the polarized 100uF cap installed backwards?
i don't understand what you mean. but no, everything is exactly like the schematic. everything is installed correctly, even the 100uf cap
You connected the battery backwards, it overheated...
it's backwards? it's hooked up exactly like the schematics. if the batteries were backwards the 100uf cap would blow up
You have a short circuit !!
You are assuming that things are as you believe. There is a fault (short circuit - pcb or component) and such faults are not shown as a feature of schematic drawings.
Use a multimeter to see the voltages, all the symptoms suggest battery backwards.
jackrae:
You have a short circuit !!You are assuming that things are as you believe. There is a fault (short circuit - pcb or component) and such faults are not shown as a feature of schematic drawings.
how can i find it? no wires are touching what they're not supposed to touch. is it possible a part may be faulty?
