3 Volt DC fan

"Andy K"

.... Phil

.... Phil

Phil,

Can you give me some more details ?

Thanks, Andy

Try Digikey or Newark.

Digi-Key has several 3.0 V and 3.3 V fans in stock, from US$11 to $50 quantity 1. 0.006 to 0.575 CFM, 0.07 W to 0.3 W.

or

What I think Phil was getting at is that a lot of 5 V nominal fans will still work at 3 V, just more slowly. That's probably why he said to pick a 5 V fan that blows more than you need at 5 V.

Yes. You can buy a switching regulator chip and some external parts to do it, or you can buy it all packaged into a module, ready to go (you put 3 V in one side and 5 V comes out the other). The modules are about US$4 to $11 quantity 1, depending on how much output power you need -

or

Standard disclaimers apply: I don't get money or other consideration from any companies mentioned.

Matt Roberds

Yeah digikey lists ~20 in stock.

If $4 is just too much, use some bent wire to make a sort of commutator arrangement mounted on the fan. With this, have the 3v charge 2 caps that, connected in series, run the fan. You may need to give the fan a flick to get it started :)

There probably are even less sensible ways.

NT

"Andy K" schreef in bericht news: snipped-for-privacy@googlegroups.com...

I looked but had no luck in finding a 3 Volt DC fan.

Can I increase 3 volts to something that will power a higher voltage fan ?

Danke Schon, Andy

"Andy K" schreef in bericht news: snipped-for-privacy@googlegroups.com...

I looked but had no luck in finding a 3 Volt DC fan.

Can I increase 3 volts to something that will power a higher voltage fan ?

Danke Schon, Andy

You can google for DC-DC convertors. 3V to 5V or even 3V to 12V. They are out there but expensive, especially when you need some hunderds of milliamps to drive a fan. There are also hundreds or maybe even thousends schematics for this type of converters. Linear alone has tens of chips for this. You will find a large number of schematics using the 555 timer. They ten to need (too) many exra components. An old one is the MC34063A. You can go from 3V to 5V@300mA. For more current and/or higher voltages you will need an extra power transistor. Details depend on the fan characteristics.

petrus bitbyter

Thanks gentlemen.

Andy

You might even put some temperature sensing on the converter to regulate the fan speed to what the load demands.