Breathing LED psd
a LED which slowly fades in and out
Description
A classic 555 Timer circuit made at oshcamp using a kit kindly provided by .:oomlout:. and documented using Fritzing.
The rate of the breathing is governed by the charging and discharging of capacitor [C1], with a smaller value of say 33µF speeding up the breathing rate. The resistor [R2] may be slightly tweaked to adjust the rate, for example try 22kΩ.
[video]
Schematic
Board
Bill of Materials
| Designator | Value | Description |
|---|---|---|
| C1 | 100µF | Electrolytic capacitor; 100µF; voltage 10V |
| R1 | 33kΩ | Resistor |
| R2 | 470kΩ | Resistor |
| LED1 | LED-10W-F | 10mm LED frosted white |
| TR1 | BC547 | NPN-Transistor |
| U1 | NE555 | 555 Timer |
| VCC1 | 9V | 9V battery, PP3 or similar |
[JSON]
Files
| .solderpad/ | |
| gerbers/ | |
| breathing-led_bom.html | 3.0 KB |
| breathing-led_netlist.xml | 2.6 KB |
| breathing-led.fz | 197.3 KB |
This project is published under the terms of the BSD License licence.