| ??? 07/05/05 13:05 Modified: 07/05/05 13:29 Read: times |
#96614 - what I do Responding to: ???'s previous message |
Then pulse the op amps positive input with the PWM. By selecting a proper feedback/currentlimiting resistor i prevent current exeding whatever the dispaly can handle.
current limiting resistor what I do is to use a constant current generator (can be a transistor and a few resistors) THAT guarantees LED survival. Then use PWM to reduce the intensity whan required. ha en go dag Erik |
| Topic | Author | Date |
| PWM - LCD backlight | 01/01/70 00:00 | |
| One Approach! | 01/01/70 00:00 | |
| Why not. | 01/01/70 00:00 | |
| Not an entirely good idea | 01/01/70 00:00 | |
| But | 01/01/70 00:00 | |
| But but | 01/01/70 00:00 | |
| hmm | 01/01/70 00:00 | |
| Apologies | 01/01/70 00:00 | |
| Buck, actually | 01/01/70 00:00 | |
| Bugger it. | 01/01/70 00:00 | |
| Bugger it | 01/01/70 00:00 | |
| Capacitor? | 01/01/70 00:00 | |
| biology | 01/01/70 00:00 | |
| Per | 01/01/70 00:00 | |
| development | 01/01/70 00:00 | |
| I got that working nicely.... | 01/01/70 00:00 | |
| Well Done | 01/01/70 00:00 | |
| what I do | 01/01/70 00:00 | |
final cut | 01/01/70 00:00 |