How to transform pozitive signal into negative?
If you got postive signal(a power, coming from battery, but its positive = + ) and you want to make it negative ( like coming from negative of battery, = - ) how you can do it. Some kind of tranzistor?
I wanted to use it in LPT port. i getting signal from pin 1(its +) and i want to change it to negative.
Please use picture as example(it's paint drawed, sorry).
picture(mirror 1) (mirror 2)