dsavitsk
MOT: ECP Audio
- Joined
- Aug 3, 2003
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To power a NOS DAC, I am using a PS that is about half way between a Tread and a welborne ps1 (essentially a lm317 based PS.) It supplies 11V at about .5A. Because the DAC has 8 stacked chips, I would like to cool it with a fan.
I happen to have an extra REG102GA-5. It seems that it will regulate a voltage down to 5V, and that since I don't care about noise (it is just powering a DC fan) I can skip all of the caps (though one on the input seems recommended.)
Data sheet is here: http://rocky.digikey.com/WebLib/Texa...ata/REG102.pdf
The questions I have, then, are:
(1) is running this at 11V in going to cause a problem? The datasheet, I think, says that 10V is the max. The fan says it is .05A, so I don't think a lot of heat is going to be generated. Should I put a resistor in series to drop the voltage a bit, and if so, how do I figure the voltage drop across the resistor?
(2) will this cause noise in the rest of the PS circuit?
(3) it appears that the enable pin must have a voltage to it for the regulator to work. Do I just connect it to the input?
(4) I don't need a precise voltage for the fan. Am I better off using a resistor based voltage divider?
I happen to have an extra REG102GA-5. It seems that it will regulate a voltage down to 5V, and that since I don't care about noise (it is just powering a DC fan) I can skip all of the caps (though one on the input seems recommended.)
Data sheet is here: http://rocky.digikey.com/WebLib/Texa...ata/REG102.pdf
The questions I have, then, are:
(1) is running this at 11V in going to cause a problem? The datasheet, I think, says that 10V is the max. The fan says it is .05A, so I don't think a lot of heat is going to be generated. Should I put a resistor in series to drop the voltage a bit, and if so, how do I figure the voltage drop across the resistor?
(2) will this cause noise in the rest of the PS circuit?
(3) it appears that the enable pin must have a voltage to it for the regulator to work. Do I just connect it to the input?
(4) I don't need a precise voltage for the fan. Am I better off using a resistor based voltage divider?