On Thu, 25 Jun 2009 23:50:51 +0100, Eeyore
wrote:



Raveninghorde wrote:

Here is my new light bulb, minus reflector.

168 112 lumen leds in 14 strings.

The main problem is the aluminium of the pcb

Is that on one side ?


is not earthed causing problems with current control

What sort of problems ? Decouple every few LEDs to GND if it's HF ?


presumably due to much higher stray capacitance than we had on FR4.
Just got to find a neat way of earthing it.

So what material is that if not FR4 ?

http://www.aismalibar.com/archivos/8...pdf?download=1



Graham

p.s. 19k lumens ! What's it a replacement for ?

A light bulb Out door space lighting.