What is the best 12V to 9V option?

Drangueos

Drangueos

Drangueos

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What would be the best/not expensive option to run a DDC 18W pump slower?

Most of the fan controllers cannot handle 18W per channel, usually 6W or less, only really expensive ones can handle 18W.

DDC Pumps starts at 8V, so something between 9v and 10v would be ideal... I found this:

L1m5gud.jpg


Did anyone ever tried? any other options?
 
I have used a 25w (or 50w - Can't remember exact value) rotary rheostat in the past to good effect. I'll have to have a look for it to see if I still have it and post a pic for you.
 
Using a EK Water Blocks EK-DCP 4.0 PWM (12V DC PWM Pump)Power consumption: 18W, i used something like a 4-Pin Low-Noise Adaptor to slow the pump
speed down, works a treat runs silent as well.
 
I was working on a circuit that took a pwm signal off a motherboard and converted it into a variable DC voltage suitable for higher loads like pumps. I already make one for fans and that's been quite successful.

I have had some success with the new circuit and it works but the only thing is you lose a volt off the top end and needed some carbon the lower end speeds. This coupled with the fact I don't have a pump to test with has slowed the development a little. I did have about 20 fans running off it, that must be close to 18W.

Oh and I did make a modular voltage dropper made out of a few connectors and diodes. It allowed 7,8,9,10v or something. It wasn't particularly pretty.

If you do just want a set output voltage then a dc-dc converter or a few 3A (a few pence each)/diodes in series would be fine.
 
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You could just ghetto our own with a big old high amp resistor spliced in between two ends of an extension cable?

Won't be elegant or adjustable, but way cheaper than all the above :p
 
kfouwels said:
You could just ghetto our own with a big old high amp resistor spliced in between two ends of an extension cable?

Won't be elegant or adjustable, but way cheaper than all the above :p
Click to expand...

The thing is, it will work, but will the resistor handle the power?
I found some 2.2ohm 20W resistors for around £2, that should work
 
Luke_Bowman said:
18W per channel is all thats needed?

So my Lamptron FC2 should work fine as it's 45 per channel? :p
Click to expand...

I tried with a FC2 and didn´t work, the pump stops when you try to lower the voltage.


What I did for the moment is to get 1ohm 7W resistor, actually a 2W probably would be enough, but I like overkills :D
S13PQfe.jpg


It dropped the RPM on a 18W DDC from 4400rpm to 3800rpm.
 
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Something like this should work DC-DC Boost converter .

It has built in voltmeter and adjustable output.

This is a boost module though so must be connected to the 5v supply rail of your psu.

Cheap as chips too, only downside is, it's from china and takes up to 4 weeks or more to arrive, there is some uk seller but cost 3x-4x more.
 
Yeah you don't want a boost converter if your stepping down - either a buck or buck-boost.

I'm using a LTC1871 based board in another project to take a 5v input and step up to 12v - very impressed with it as it holds 12v very stable even with some significant ripple, etc. on the input.

There is a few different ones sold by DEOK on Amazon - word of caution though they are fairly decent as far as it goes they are a bit over-stated spec wise i.e. the 100watt ones looking at the components on there I wouldn't push em past 50-60watt.
 
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