This is a circuit I dreamed up in my head. I have the Schematic for it but I don't know how to post it. It is a very basic circuit. I am using the 8 LPT outputs from the parallel port on the Desktop computer to trigger 8 Transistors which in turn can control instead of 5.5 Volt accessories will be able to Control 12 Volt Accessories. What really is making this easier is the fact that the ground is the same for the LPT port as it is at the 4 Pin Molex plug and the case ground. This way I simply connect the LPT out to the Collector of the transistor through a resister and directly onto the Collector of my transistors. I am switching the ground rather than the High side or the 12 volt and now I can power up my 12 volt LEDs and use LPT effect or my other LPT control program to switch on and off either Relays or 12 volt Accessories at about 200MA. these are not very highly rated transistors and it is mostly just something to do. not a real serious project. I have the Collector pins of my transistors soldered in, but so far that is as far as I have gotten. I have a box chocked full of Capacitors, Resistors, Transistors, LEDs,etc, etc, etc that I am having to dig through and then test every component before I solder it, so that has taken most of my time. Some of the transistors have different numbers on them like a 2N3906 B331 and a 2N4403 331 but that is mostly determining how much current they can handle and that sort of thing. They should be more than capable of handling the small amount I am putting on them. and once I get this finished I will make a video and post it from my Youtube so you all can see how it turns out. I am not going to make a video of the making though because I have a lot on my mind. By the way all of the transistors passed the Touch test I gave them and all in the same direction. my touch test is simple. I hook up an LED on a resistor, face them the same direction and if I touch the collector pin and the base pin and the LED lights up.. this to me means that it is the same type of transistor as the others and that it works. I didn't care to look up the part numbers and I am using jumbled Transistor types because I am being lazy lol, it should work though.
I'm Having some fun wish me luck!
I'm Having some fun wish me luck!