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STD LED Color Mixer(PWM for Variable freq & Duty-Cycle) V1.0
License: Public Domain
Mode: Editors' pick
- 0
Update time：
2019-02-19 16:14:02
Creation time：
2019-02-17 18:46:36
Description
This is an analog device to controll a RGB LED strip requireing 12V as the source voltage. It can be modified to accomodate different voltages.
The frequency is set at 1kHz, but by changing RT(39k resistor) to a potentiometer, the frequency can be variable. One this is setchanges to the duty-cycle for each color can be changed without altering the freq. The duty-cycle can be changed from 0% - 100%.
An alternative method of obtaining the same results can be done using a 555 timer IC, albeit an aditional IC is required. This circuit has not yet been tested.
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| ID | Name | Designator | Footprint | Quantity |
|---|---|---|---|---|
| 1 | 5k | R5,R3,R7,R8,R12,R13 | AXIAL-0.3 | 6 |
| 2 | 10k | R4,R10,R15,R9 | RES-ADJ_3386P | 4 |
| 3 | 2N7000 | Q1,Q4,Q2 | TO-92(TO-92-3) | 3 |
| 4 | NO | TP1,TP4,TP2,TP3 | TP_4545 | 4 |
| 5 | 1k | R16,R18,R20,R6 | AXIAL-0.3 | 4 |
| 6 | 22k | R17,R19,R21 | AXIAL-0.3 | 3 |
| 7 | 39k | RT | AXIAL-0.3 | 1 |
| 8 | 100k | R2 | AXIAL-0.3 | 1 |
| 9 | 0.01uF | CT,C6 | RAD-0.1 | 2 |
| 10 | 51k | R11 | AXIAL-0.3 | 1 |
| 11 | 3.9k | R14 | AXIAL-0.3 | 1 |
| 12 | 33k | R1 | AXIAL-0.3 | 1 |
| 13 | LM339N | U4,U1,U2 | DIP-14 | 3 |
| 14 | 10k | R5,R3,R7,R8,R12,R13 | AXIAL-0.3 | 6 |
| 15 | NE555P | U2 | DIP-8 | 1 |
| 16 | 0.1uF | C4,C5 | RAD-0.1 | 2 |
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