I wanted to run my screen in the car (10.4inch VGA LCD) but it needed +17volts, so, anyway, I tried running it straight from teh battery, and it workes, but after half an hour of running without teh car on, and while cranking, the screen cuts out.. :P So, I went about finding another circuit, and came across the I-BOOSTER, which gives about +18volts from something like 8-16volts... but, I had no way of making a PCB, and whenever I try making it on the blank board (I forget what it is called) it NEVER works... So, what do I do??? simple.. Well, the 12volt part of the sproggy doesn't give +17volts, but it does work from the requirted voltage range.. So, I made a simple voltage divider for the 12volt feedback line, so, now I get, (or SHOULD GET) +16volts @ 1.5amps or so.... Well, I make it checked it, and connected it to 10volts, and found that the results were somewhat BBUUUZZZZZZZ!!!!! it sounded like a cap was being charged reverse polarity.. hmm... so, I checked it all again, but couldn't find anything... I removed the 1800uF (I am actually using 2200uF) to see if that made any dif... NOTHING!!! (got any ideas as to what it could be so far??) I still hadn't modified the transformer, so, I did that, but still.. BBUUUZZZZZ!!!!! hmm. this isn't going too well.. I returned the supply to normal (without the voltage divider) nor the filter caps, and STILL!!!... BUZZZ!!! okay I QUIT!!!!!!! so, I quickly just solder everything up as it would be if it were working, finished... (caps, voltage divider) AND IT WORKS!!!!!! so, my question is... why does it work now, when it didn't before??? Also, I thought I should point out that instead of a 0.68uF cap, I used a 0.47uF as I didn't have the former of the 2... I thought this would result in a higher switching frequency... Yes, No?? Well, anyway, now I went about testing it, I connected a fan (draws about 300ma) and tested how LOW it could go before the voltage dropped below the 16.10 that it gave out with 10volts in.... well, it lasted down to about 3.7volts... he he...

Well, anyway, now i have an 8-20volt in to 16volt out supply.. at about 1.5amps...