About the article

LED Bedside Lamp

with turn-off delay

LED Bedside Lamp

If you are not lucky enough to have access to expensive test gear then lamp circuits using LEDs offer a good chance of success and allow a little bit of electronic experimentation. One of our readers has come up with this simple but useful addition to the bedside table. The lamp is activated either by pressing a push button or automatically when the in-built microphone detects a noise.

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Gerber file

CAM/CAD data for the PCB referred to in this article is available as a Gerber file. Elektor Members can exclusively download these files for free as part of their Membership. Gerber files allow a PCB to be produced on an appropriate device available locally, or through an online PCB manufacturing service. Elektor recommends its business partner Eurocircuits as the company of choice for its own prototypes and volume production in selected cases.

R1 = 15kOhm
R2,R8,R9 = 100kOhm
R3 = 22kOhm
R4 = 5kOhm 6
R5 = 6kOhm 8
R6 = 1MOhm
R7 = 390kOhm
R10 = 10kOhm
R11 = 18Ohm
C1 = 22nF
C2 = 47µF 16V radial
D1 = LED, white, e.g., Conrad Electronics # 153867
IC1 = TLC274
T1,T2 = BC547B
Bt1 = battery holder for 4 NiMH cells
K1 = charge socket for batteries
MIC1 = electret microphone capsule
S1 = pushbutton, 1 make contact
PCB, ref. 030122-1
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