Ok, 1st and foremost yeah I know I should of bought a opus but it looked too big but now it looks like my solutions will be just about as big. Anyways, as I'm sure most of you have already heard a 100 times I am planning to use regulators in order to send a smooth 12 volt output to that square looking 200 watt powersupply on minibox.com. Um... I also have the ITPS which of course doesn't get close to producing enough power for my current setup estimated at at least 100 watts. So here is my idea. Unlike most other people who have talked about using a ton of 1 amp or 2 amp regulators I went straight for 2 7.5 amp ones. In addition most people have used regulators with drop out voltages of as much as 1.5 volts. The model I plan to use MIC29712 http://www.micrel.com/_PDF/mic29710.pdf which has a MAXIMUM dropout of .7 volts with an estimated .4 dropout for the load I'm going to be sending through it. So now I have two 7.5 amp regulators. Looking at the diagrams in that pdf file I came up with a fairly simple design. I would take the 12v out of the ITPS and send into pin 1 which basically turns the regulators on or off. Pin 2 is unregulated positive in. Pin 3 is ground Pin 4 is used for adjusting the output voltage and pin 5 is regulated output. In order to get a 12 volt out I put in a 100 kohm resistor from pin 5 to 4 and an adjustable pot set at around 12k ohms (but adjustable) from pin 4 to pin 3. I plan to use a breadboard since they have straight lines under the surface which connect multiple spots making it easy to connect everything. One of my questions is this. I will have 15 amps running through the board and from what I've seen most say they are only designed for around 4-5 amps which could cause some serious problems with heat or resistance. So is there any backing in this since most electronic stuff I see doesn't have problems with taking a lot more current than that in the same size wire. My next question is this, most boards that people are designing contain several capacitors while I have not included any on mine at all. I don't care about the PC rebooting on crank. But I do want the system to be able to shutdown after the alternator turns off and the voltage drops down to 12v. My final question is this. I would like to make some use of the 5-7 amps of regulated 12v outputted by the ITPS so I've thought of using a diode so I can both use to power the logic input as well as go provide some extra power to the computer, relieving the regulators of some work and heat. The reason it is required is because otherwise it would be feeding itself which would make it never turn itself off. My ? is most diodes take out some current which if I can help it I would like to get around. I really thank you for reading this. I know this is pretty long. I'll try and explain it further if need be but I don't understand why the circuit need to be so hard. Thanks for all your help
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Building a 12 V 15 amp Regulator got some ?