Understanding D3 Component

flux

0:54

Project
Schematic
D3
Here’s a summary of what D3 does in your circuit:

Table

PropertyDetails
ComponentD3 (LED THT)
FunctionVisual “alarm” indicator driven by U3’s output
Anode ConnectionNet 11 (NE555 U3’s OUT)
Cathode ConnectionGND
Forward Voltage (Vf)1.70 V
Series Resistance0.42 Ω (internal model)
Saturation Current93.2 pA
Explanation:
  • [D3] is a through-hole LED used to show when the second 555 timer (U3) goes high.
  • When U3’s OUT pin drives Net 11 high (≈9 V), current flows through D3 to GND, causing it to light.
  • Its forward voltage (~1.7 V) and small internal series resistance determine its brightness at the available supply voltage.
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R6 100k
Resistance
100000 Ω
LM393AP U1
U3
Potenciometro 10K
Resistance
10k Ω
D3
R5 100k
Resistance
100000 Ω
Capacitance
100 nF
NE555 U3
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