Public Domain
555 timer based PWM LED dimmer
This project uses PWM to turn on and off a LED (or a strip of them) really fast and changes the duty cycle (Fig.1) so that the human brain perceive it as the dimming of the LED(s). This means that the MOSFET doesn’t have to drop large amount of voltage, this makes the device very energy efficient.
Fig.1
TODO: Calculate efficiency at different load currents and put a graph here.
| ID | Name | Designator | Footprint | Quantity | Manufacturer Part | Mounted | |
|---|---|---|---|---|---|---|---|
| 1 | LEDOUT | LEDOUT | CONNECTOR 5.0MM | 1 | 2.54-1*2PFemale | Yes | C49661 |
| 2 | NE555DR | U2 | SOIC-8_150MIL | 1 | NE555DR | Yes | C7593 |
| 3 | VIN | VIN | CONNECTOR 5.0MM | 1 | 2.54-1*2PFemale | Yes | C49661 |
| 4 | 100R | R3 | 0603 | 1 | RS-03K1000FT | Yes | C115420 |
| 5 | NCE3018AS | Q1 | SOP-8_150MIL | 1 | NCE3018AS | Yes | C163739 |
| 6 | 1uF | C1 | 0603 | 1 | 0603X105K160NT | Yes | C89188 |
| 7 | 1k | R4 | 0603 | 1 | WR06X1001FTL | Yes | C112433 |
| 8 | M4 | D2,D1 | SMAF | 2 | M4 | Yes | C164158 |
| 9 | 50K | R2 | RES-ADJ_EVM3X3 | 1 | EVM3ESX50B54 | Yes | C11962 |
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