What is an easy way to do this? I'm really going in circles and would need an overview:
There is a certain input line, output line, a high voltage, a low voltage - and a reference voltage.
Now if the input is higher than the reference the output will be "high voltage". If the input is lower than the reference the output will be "low voltage". How can this be achieved?
I've only got diodes, transistors, resistors (and capacitors/inductors etc) to do this. If I would use an amplifier I need to build one myself.