Biltong box - need to power a 100W bulb and a 12V fan

[frustin]

Hi,

I need to power a 100W bulb (for heating) and a 12V PC fan (for extracting the moisture). I was thinking of using a LED Driver Power Supply Transformer 240V - DC 12V to power the PC fan.

Ideally I'd like to have a RCD between mains and the light/fan combo.

Anyone got any suggestions please?

 

[winston1]

Hi,

I need to power a 100W bulb (for heating) and a 12V PC fan (for extracting the moisture). I was thinking of using a LED Driver Power Supply Transformer 240V - DC 12V to power the PC fan.

Ideally I'd like to have a RCD between mains and the light/fan combo.

Anyone got any suggestions please?

An LED driver is not a transformer, transformers output AC, but yes there is no reason you can't use one for the fan, or for that matter any universal power supply that can output 12 V DC.

 

[frustin]

thanks for the prompt reply. can you tell me the best way to split off the supply to the light and LED driver please? i.e. choc box isnt really a good way to do it, what are my (cheap) options please?

 

[bernardgreen]

An extension lead with two 13 amp sockets. One plug ( with 3 amp fuse ) supplies the lamp, the other supplies the fan's power supply unit.

Death comes cheap, survival is a bit more expensive.

 

[Nozzle]

I was thinking of using a LED Driver Power Supply Transformer 240V - DC 12V to power the PC fan

You'll probably find that the LED Driver needs a minimum current to work properly, and that minimum current is more that the demand from the fan - and this will mean the LED Driver can't regulate the voltage properly. Take a look at the current rating of the fan, and report back.

Nozzle

 

[winston1]

I was thinking of using a LED Driver Power Supply Transformer 240V - DC 12V to power the PC fan

You'll probably find that the LED Driver needs a minimum current to work properly, and that minimum current is more that the demand from the fan - and this will mean the LED Driver can't regulate the voltage properly. Take a look at the current rating of the fan, and report back.

Nozzle

That normally applies to halogen lamp drivers, which output high frequency AC anyway, not 12V DC LED drivers. LEDs take little current.

 

[ericmark]

An extension lead with two 13 amp sockets. One plug ( with 3 amp fuse ) supplies the lamp, the other supplies the fan's power supply unit.

Death comes cheap, survival is a bit more expensive.

Clearly you have not lost anyone resent your looking at around £4000 to die.

What I have not worked out is the bulb 12 volt or 230 volt?

 

[winston1]

An extension lead with two 13 amp sockets. One plug ( with 3 amp fuse ) supplies the lamp, the other supplies the fan's power supply unit.

Death comes cheap, survival is a bit more expensive.

What I have not worked out is the bulb 12 volt or 230 volt?

You don't get 12V 100W bulbs, even for car headlamps. Clearly the bulb is 240 volt.

 

[bernardgreen]

You don't get 12V 100W bulbs, even for car headlamps. Clearly the bulb is 240 volt.

You do , the first on Google was. There are many places were 12 volt 100+watt lamps are used.

http://www.prolightingaccessories.c..._315770.aspx?gclid=CMfPzu-l7L4CFbDJtAodik0A4A

And who implied the lamp was 12 volt ?

 

[winston1]

You don't get 12V 100W bulbs, even for car headlamps. Clearly the bulb is 240 volt.

And who implied the lamp was 12 volt ?

No one.

 

[bernardgreen]

Clearly you have not lost anyone resent your looking at around £4000 to die.

The costs after death can be very high.... the cause of the death can be cheap.

The point I was making to the OP was that doing things on the cheap can create hazards that may lead to a death.

One source for linear ( ie NOT switch mode power supplies ) is

http://www.stontronics.co.uk/Products/Linear-Adaptors/AC-DC-Linear-Adapters

Choose one to match the voltage and power of the fan.

 

[winston1]

You don't get 12V 100W bulbs, even for car headlamps. Clearly the bulb is 240 volt.

You do , the first on Google was. There are many places were 12 volt 100+watt lamps are used.

http://www.prolightingaccessories.c..._315770.aspx?gclid=CMfPzu-l7L4CFbDJtAodik0A4A

Hm, I stand corrected, but only 500 hours lifetime!

 

[frustin]

I was thinking of using a LED Driver Power Supply Transformer 240V - DC 12V to power the PC fan

You'll probably find that the LED Driver needs a minimum current to work properly, and that minimum current is more that the demand from the fan - and this will mean the LED Driver can't regulate the voltage properly. Take a look at the current rating of the fan, and report back.

Nozzle

This is the one i had in mind. I'm not sure of the fan rating (except it's a 12V fan), but i can see that the converter is min 0.5W, which is only about 42mA.
http://tinyurl.com/n5qdoda

I'm actually really interested in the best way to make the circuit with the 100W (230V) bulb, plus the converter. whats the best way to split from one mains source? Hope I'm asking the right question.

 

[Nozzle]

You can have the LED power supply wired "in parallel" with the 100W mains light bulb, no problems. Keep in mind the 100W bulb will get pretty hot so you need to have it a safe distance away from the box. Does your PC fan have a power rating on it? Or you can measure the current draw with a meter while plugged into a suitable supply.

http://www.buildcomputers.net/power-consumption-of-pc-components.html

It looks from here that as long as you don't pick the smallest of fans, then any of them will achieve the minimum current draw to make the power supply work.

Nozzle

 

[frustin]

thanks

Is there a component i can buy to split off the mains lead?