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I may have a need to use a fan in my project. The tubes (2x 8cg7 running at 8V heaters and 2x 6H30 running at 6V heaters) are inside the chassis.I plan to get the power from the 1st cap of the regulated DC supply (using LT1084 which is similar to LM317) which acts as heater suppy for the tubes mentioned above.
not sure what fan size to use yet. But I'm hoping I can fit a low noise 8cm fan in there. I may need to install the fan on the outside of the chassis which thankfully is on the back. I'll need to see if it fits.
Should the fan be blowing in or out?
any thoughts/comments?
Follow Ups:
A few thoughts:
Scope out the path of air flow. You need an air in and an air out and see to it there is a path and the air after it picks up the heat won't be heating something you don't want it to.
When it comes to fans bigger is quieter for a given CFM.
If you use something like the LM317, you could incorporate a thermistor in place of the fixed resistor or adjustment pot, locate it in the hot spot and you will have a demand throttling fan which will adjust it's speed as needed. You will have to spec out the value for the thermistor.
Rectify a heater winding which will give you approx 8V DC.
Wire a 12V fan to that - it runs a bit slower and is dead quiet.
Cheers,
Ian
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