"Hotwiring" a power supply

[MikeB]

I'm messing about with building a PC (from the frame on up). I tell
ya, it's a project that just keeps on spiraling out of control... I
just riveted together parts of the chassis I took apart to spray
paint. Now I'm looking at fitting the fans.

And here comes the crunch. I'm sitting there, looking at the fan and
wondering which way the fan spins and how to install it?

So, and quick hints on how to tell which way a fan will spin if power
is applied to it?

That brought on the topic of this post. I wanted to use one of my
power supplies, connect the fan and see which wayit spins. SO I
connected the PSU to the mains, but obviously, all the power is still
dead (waiting for the power-up) signal that has to come from the
motherboard.

Can I simply hotwire a pin in the 24-pin connector and get the PSU to
supply power to all the outputs? Is it a continuous connection or an
instantaneous connection?

I'm going to try it anyway in a few hours, just thought I'd ask around
first and see what kind of help I can get.

Still studying power supply pinouts and connectors...

Thanks

 

[meerkat]

I'm messing about with building a PC (from the frame on up). I tell
ya, it's a project that just keeps on spiraling out of control... I
just riveted together parts of the chassis I took apart to spray
paint. Now I'm looking at fitting the fans.

And here comes the crunch. I'm sitting there, looking at the fan and
wondering which way the fan spins and how to install it?

So, and quick hints on how to tell which way a fan will spin if power
is applied to it?

That brought on the topic of this post. I wanted to use one of my
power supplies, connect the fan and see which wayit spins. SO I
connected the PSU to the mains, but obviously, all the power is still
dead (waiting for the power-up) signal that has to come from the
motherboard.

Can I simply hotwire a pin in the 24-pin connector and get the PSU to
supply power to all the outputs? Is it a continuous connection or an
instantaneous connection?

I'm going to try it anyway in a few hours, just thought I'd ask around
first and see what kind of help I can get.

Still studying power supply pinouts and connectors...

Thanks

The Green wire in the MBoard conector and a Black wire,
will trigger the PSU.
Reshape a paper clip to go into the back of the connector.

 

[spodosaurus]

I'm messing about with building a PC (from the frame on up). I tell
ya, it's a project that just keeps on spiraling out of control... I
just riveted together parts of the chassis I took apart to spray
paint.

Why??? Most cases have panels, fronts, and tops that just unscrew or
unclip...

Now I'm looking at fitting the fans.

And here comes the crunch. I'm sitting there, looking at the fan and
wondering which way the fan spins and how to install it?

Some basic knowledge of how a propeller works would help you decipher
that just by sighting it. However, most case fans have two arrows on
their plastic: one pointing in the direction of fan rotation and the
other pointing in the direction of airflow.

So, and quick hints on how to tell which way a fan will spin if power
is applied to it?

That brought on the topic of this post. I wanted to use one of my
power supplies, connect the fan and see which wayit spins.

Completely unnecessary.

Cheers,

Ari

--
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[Matt]

connect the fan and see which wayit spins.

Hook it to your car battery.

 

[MikeB]

Hook it to your car battery.

LOL. Doesn't sound half as much fun.

 

[MikeB]

Why??? Most cases have panels, fronts, and tops that just unscrew or
unclip...

I wanted the different part to be different colors, so the easiest
thing to me looked like drilling out the rivets, painting the parts
and riveting them back together again.

Some basic knowledge of how a propeller works would help you decipher
that just by sighting it. However, most case fans have two arrows on
their plastic: one pointing in the direction of fan rotation and the
other pointing in the direction of airflow.

Yea, I can look at the shape of the blades to figure out which way the
airflow will go, but I can't figure out which way the fan will spin.
These stupid Antec fans I bought don't have any arrows on the casings
at all. Nor does the fan show a front or back. They seem to be all-
side-same side for fitting purposes so that they can be fitted to
either the front or read of a case.

Completely unnecessary.

Oh well,,,

 

[Mac Cool]

MikeB:

I can't figure out which way the fan will spin.

Can't you just hook it up to a 9 volt battery?

 

[Andy]

Typically, the side that has the label, which is the side that holds
the motor to the frame, is the side that the air blows out of.

 

[Conor]

Typically, the side that has the label, which is the side that holds
the motor to the frame, is the side that the air blows out of.

Also on the outer of the case, there's usually two arrows. One
depicting direction of rotation and the other direction of airflow.