Differences
This shows you the differences between two versions of the page.
Both sides previous revisionPrevious revision | Next revisionBoth sides next revision |
rgb_dimmer [2015/02/22 20:02] – [Recommended LED module and resistors] breaker27 | rgb_dimmer [2015/02/22 20:11] – [Recommended LED module and resistors] breaker27 |
---|
| R8 | Resistor for **blue** LED | 22 Ohm | 15 Ohm | 3,9 Ohm | | | R8 | Resistor for **blue** LED | 22 Ohm | 15 Ohm | 3,9 Ohm | |
| |
The "bright" resistors result in LED currents of ~120mA and a power dissipation at the LED module of ~1W and don't need an additional heat sink. The resisors have a power dissipation of <0,3W, 1/4W resistors max be enough. The overall current of the RGB dimmer is 380mA, so a typical power supply for smartphones with 500mA max. current fits perfectly. | The "normal" resistors are enough if you use a thin glass housing (as shown on the homepage). You can use normal 1/4 W resistors and the LED module won't heat up much. No heat sink required. This is the safest and easiest choice. |
| |
| The "bright" resistors result in LED currents of ~120mA and a power dissipation at the LED module of ~1W. It should not need an additional heat sink, but it gets hot already (you can touch it, maybe ~50°C). The resisors have a calculated power dissipation of ~0,3W. 1/4W resistors max be enough, but I recommend to use metal film resistors (1W). The overall current of the RGB dimmer is 380mA, so a typical power supply for smartphones with 500mA max. current fits perfectly. |
| |
The "normal" resistors are enough if you use a thin glass housing (as shown on the homepage). | |
| |
For the "max" resistors, you need an extra heat sink at the LED module and resistors which can cope with the higher current (1W). | For the "max" resistors, you need an extra heat sink at the LED module and resistors which can cope with the higher current (1W). |