| Electronics > Projects, Designs, and Technical Stuff |
| Halogen vs LED |
| << < (2/2) |
| Hextejas:
If I did the google search correctly, it looks like there are a lot to try. The spec sheets are daunting. :palm: |
| SiliconWizard:
But what's the application? Looks like a bulb for cars or something, but just tell us what it is used for. |
| mariush:
The halogen says 14v 35w ... in fact you can still buy the bulbs : https://www.eevblog.com/forum/projects/halogen-vs-led/ You can assume that's 14v AC and I guess it's supposed to be used with lamps or things that use a dumb 12v AC transformer inside to provide isolation from mains. You could use LEDs but first you must convert the AC to DC using a diode (cheap but led would be off half the time, so you'd get flicker) or a bridge rectifier (for full wave rectification, less flicker) Then you'd add a small capacitor to smooth the rectifier voltage and then you'd want to limit the current going through the led otherwise it would burn up. Now you get a LED with a forward voltage less than your average DC input and you need to limit current going through it otherwise you'll damage it. Either use a plain simple resistor or use a led driver |
| Zero999:
A capacitive dropper can be used before the rectifier to save burning off lots of power in a resistor. Another option is to look for retrofit LED bulbs which can replace halogen bulb, with no extra components: the bridge rectifier and current limiting circuitry is built-in. |
| tooki:
Be sure to throughly clean that bulb with isopropyl before using it again; the skin oils deposited by handling with bare hands cause hotspots on the quartz envelope which will cause it to fail. |
| Navigation |
| Message Index |
| Previous page |