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You want to make a laptop cooler, then why dont you run these fans off the USB. It will give you 5Volts so the fans will run a little slower. Unless though you get power through two USB ports which theoretically can give you 10V so it will run almost at full speed.
Most USB coolers though have...
Re: Power Supply Problems...
Thanks mate. You guys been really helpful.
Actually the problem was noise from the DC Output of the transformer. I was only using 1uF and 10uF caps in parallel. I changed them to 10uF and 100uF and it now works as it should :)
Re: Power Supply Problems...
Aye thanks again. The voltage regulator was very hot but now that I placed a 33Ω resistor at the positive terminal of the backlight the regulator has cooled down considerably :)
I still cant get the transformer to power up the circuit though. I'll get hold of a...
Power Supply Problems...
Aye ok it was my stupidity, seems I got the inputs wrong :(
Working fine now :). Thanks guys...
Still though with the transformer. It is giving me 4.4V after regulation. Should be enough to turn on the circuit but all it does is shows the bars on LCD screen and seems...
Re: Transformers
Well it is really weird. I got three of these L7805CV regulartors and they all arent giving me 5V output. I tested all three with a resistor and LED and measured the voltages and they all are giving me an 11V output?
However when I use a 12V regulator CUE7812C with the same...
Transformers
Now that I have seen the diagram, the push buttons are drawn incorrectly lol. They are working fine. I push them and the PIC responds to them correctly. I changed them to 1.2K and the problem is still there. I tested the circuit with two 7805 ICs so that shouldnt be the problem...
Re: Transformers
Nothing really in the power supply. I just connected according to the schematic in the 7805 data sheet. I tried it with and without the caps. Just the same...
Re: Transformers
Hi mate,
The circuit still works actually. It is my project :) for my degree in Uni but I am having some problems. It is a weird problem. One of many.
I actually have a 9V DC adaptor (Measured at 13V DC with multimeter) plugged in a 7805 voltage regulator. But the output...
how to put l7805 on breadboard
Ok I have a 240V to 6V AC transformer. It has a maximum current output of 1.2A.
I connected it to a diode rectifier and it produces 6.45V DC. When I connect this to my micro controller circuit, the micro controller doesnt initialize and my circuit doesnt work...
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