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STD Multi-Pulsing LED string driver

License: Public Domain

Mode: Editors' pick

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Update time: 2019-08-07 18:57:19
Creation time: 2019-07-23 17:01:16
Description
This device will drive up to 4 strings of LEDs, each with approximatly 48 lights. Each of the 4 strings will slowly pulse (fade on/fade off). If using 7555 CMOS timers, the pulses will be out of sequence; If using standard 555 timers, they will couple and all pulse together. Pulse rate is adjusted by changing the resistor and capacitors (100k, 22u) for each timer sub-circuit. Requires 12V input, about 200mA, depending on LED count. Apply power to pin 1 for pulsing or pin 3 for steady, all lights on.
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ID Name Designator Footprint Quantity
1 NE555P U1,U2,U3,U4 DIP-8 4
2 0.1u C1 RAD-0.1 1
3 .01u C2,C6,C5,C9 RAD-0.1 4
4 1u C3 CAP-D8.0XF3.5 1
5 100k R1,R3,R5,R7,R10 AXIAL-0.4 5
6 BC547B Tube Q1,Q2,Q3,Q4,Q5,Q6,Q7,Q8 TO-92(TO-92-3) 8
7 Header-Female-2.54_1x4 P1,P2 HDR-4X1/2.54 2
8 10k R2,R4,R6,R8 AXIAL-0.4 4
9 1k R9 AXIAL-0.4 1
10 1N4448 D1 DO-35 1
11 22u C4,C8,C7,C10 CAP-D6.3XF2.5 4

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