Need a dimmer switch for stirplate (HELP!)

[nutty_gnome]

Summary: Please suggest a device that I can put inline on the DC output to my homemade stirplate that can be used to adjust (like a dimmer switch) the RPM of the sitrplate.

I have a DIY stirplate. It works great but the vortex is a bit extreme. I am running around 9 volts and very little amps from a hacked battery charger to a DIY computer fan. I would like to be able to dial down the RPM by altering the DC voltage to the fan to control the vortex created by the sitrplate. While I love screwing around with pre-made electronics, I don't know what part one would install to do what I wish. Can anyone point me to a radio shack part number or maybe something from home depot or lowes that I can install to do the job? Thanks! N_G

 

[mariojr]

Here is the part that I used from the https://www.homebrewtalk.com/f51/my-stirplate-cheap-easy-build-86252/ build I did.


25 ohm 3 watt Rheostat (aka Potentiometer): Part number 271-265 - $3.99

 

[tasq]

+1 on potentiometer

 

[Great_Neck_Brewer]

You can use a low voltage dimmer switch, just make sure it says low voltage not 120v. Pick them up at Lowes or HD

 

[bja]

I've heard this will work, but I haven't tried it yet.

Use a household dimmer switch (like the one in your living room) to control the power TO the power supply.

Anyone know if this will or will not work?

 

[the_bird]

Go to Radio Shack and buy a potentiometer for like $2. It's exactly what you want.

 

[nutty_gnome]

They happen to have one in stock at the local radio shack, so I'll go get one. By the way, the low voltage dimmers from Home Depot and Lowes range from 50 to 100 bucks each. The 3.99 potentiometer seems like a way better deal.

 

[nutty_gnome]

OH yeah, update. I did install the potentiometer along with a very simple switch on the rig. Was a fun project. I now have more control over the dimple. I'd say the switch is a more important addition; now I don't have to engage a wall socket or unplug live wires with hands wet with sanitizer.

 

[Sawdustguy]

I've heard this will work, but I haven't tried it yet.

Use a household dimmer switch (like the one in your living room) to control the power TO the power supply.

Anyone know if this will or will not work?

Depending on what type of DC power supply it is you risk damaging it if you lower the input voltage too low.

 

[bja]

Depending on what type of DC power supply it is you risk damaging it if you lower the input voltage too low.

Well, I've got several that could be sacrificed in the name of research, so I'll give it a shot.