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 Post subject: Power Supply
PostPosted: 14.09.2003 01:17 
I have a 9 volt power supply from a transformer and i need to know which line has the voltage and which one is ground, one line has a dotted line on it and the other doesnt. Which one should i solder the LEDS to?


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PostPosted: 14.09.2003 04:54 
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Ultra Modder
Ultra Modder

Joined: 09.06.2003 08:30
Posts: 1592
Location: Orlando, FL, USA
from the way it sounds, i would say neither if u dont got the right resistor. but im guessing that the --- would be the ground, but im not absolute. try by pluggin a 12v fan to it, when the wires are right, it will work.

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PostPosted: 28.09.2003 08:20 
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Regular Modder
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Joined: 24.10.2002 23:16
Posts: 241
Location: California
i dont remeber where, but i read somewhere that transformers dont always give out the right amout of power, it might give more. u should probably solder a voltage regulator to it 1st, then a resistor, and then the led(s). i think the 5V regulators are 8505.


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PostPosted: 28.09.2003 08:26 
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Site Admin
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Joined: 24.01.2002 10:09
Posts: 4683
Location: Finland
7805 outputs 5 volts. Like carnut101 already pointed out, wall transformers are usually nonregulated. That means that 12 volt transformer might be outputting 17 volts when not loaded. That is why you should use this regulator so that the output of the unit will never exceed that 5 volt limit. If you need 12 volts, you can use 7812 for that. I did the same with my ModLab.

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