bryan1
Well-Known Member
Hiya Guy's,
Well my 3 watt lambetian led finally arrived and I'm looking for a decent switchmode circuit to drive the LED. So far I've searched google for ages, searched thru the electrotech forum for past projects with no sucess. I don't want to use the siliconchip version as at $30 each it will be too expensive. Later I'll put up a photo of the box I'm using but it's all Aluminium so that will make an excellent heatsink and I have a 6 volt 4.5 amp hour battery to run the led. One way to do it is use a linear supply via a lm317 but this is wasting about 2.5 watts so thats out the question. But today I will make up a 317 driver circuit just to show you blokes how bright this led is, I powered it last nite using a couple of lithium ion batteries in series and :shock: it does shine a light from the shed to the house.
Any suggestions an a suitable circuit will be apprecieated.
Cheers Bryan
Well my 3 watt lambetian led finally arrived and I'm looking for a decent switchmode circuit to drive the LED. So far I've searched google for ages, searched thru the electrotech forum for past projects with no sucess. I don't want to use the siliconchip version as at $30 each it will be too expensive. Later I'll put up a photo of the box I'm using but it's all Aluminium so that will make an excellent heatsink and I have a 6 volt 4.5 amp hour battery to run the led. One way to do it is use a linear supply via a lm317 but this is wasting about 2.5 watts so thats out the question. But today I will make up a 317 driver circuit just to show you blokes how bright this led is, I powered it last nite using a couple of lithium ion batteries in series and :shock: it does shine a light from the shed to the house.
Any suggestions an a suitable circuit will be apprecieated.
Cheers Bryan