LED Blinker Circuit Design

flux

Schematic is complete (9V -> switch -> NE555 -> blinking red LED) Added through-hole, hand-solderable parts

Table

FunctionPart
9V inputB1
On/off controlS1
Timer IC (astable)IC1
Timing resistorsR1, R2
Timing capacitorC1
Decoupling capacitorC2
LED + current limitLED1, R3
Key wiring (NE555 astable)
  • Power path: B1 (+) -> S1 -> IC1 VCC
  • Astable node:
    • R1 from VCC -> DISCH
    • R2 from DISCH -> THR/TRIG node
    • C1 from THR/TRIG node -> GND
    • IC1 THRES and TRIG tied together to the timing node
  • Output LED: IC1 OUT -> R3 -> LED1 -> GND
  • Decoupling: C2 across VCC-GND (and also used to tie CTRL to GND)
Timing values (about 1 Hz blink)
This yields approximately ~1 Hz oscillation (about 1 second per cycle).
Checks
  • ERC/DRC: no single-pin nets or undriven nets reported.
  • SPICE verification: attempted, but the simulator tool errored due to context limits, so I could not numerically confirm period/duty via simulation in-tool.
If you want, I can proceed with the optional PCB layout constraints/placement guidance next (still through-hole, clearly labeled polarity for B1, C1, and LED1).
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R3
Resistance
680 ohm
R2
Resistance
47kohm
R1
Resistance
47kohm
GND
GND
S1
B1 POSITIVE - S1 COM
B1 POSITIVE - S1 COM
R3 P2 - LED1 A
B1 POSITIVE - S1 COM
R3 P2 - LED1 A
B1 POSITIVE - S1 COM
GND
GND
R2 P2 - C1 P1
B1 POSITIVE - S1 COM
R2 P2 - C1 P1
R1 P2 - R2 P1
R1 P2 - R2 P1
C2
Capacitance
100nF
C1
Capacitance
10uF
B1
LED1
IC1
  • Generic Inductor
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    A generic fixed inductor suitable for rapid circuit topology development. The footprint automatically adapts based on the selected package, supporting standard SMD sizes (e.g., 0402, 0603, 0805) as well as well-known inductor packages such as SDR1806, PA4320, SRN6028, and SRR1260. Standard inductor values: 1.0 nH, 10 nH, 100 nH, 1.0 µH, 10 µH, 100 µH, 1.0 mH 1.2 nH, 12 nH, 120 nH, 1.2 µH, 12 µH, 120 µH, 1.2 mH 1.5 nH, 15 nH, 150 nH, 1.5 µH, 15 µH, 150 µH, 1.5 mH 1.8 nH, 18 nH, 180 nH, 1.8 µH, 18 µH, 180 µH, 1.8 mH 2.2 nH, 22 nH, 220 nH, 2.2 µH, 22 µH, 220 µH, 2.2 mH 2.7 nH, 27 nH, 270 nH, 2.7 µH, 27 µH, 270 µH, 2.7 mH 3.3 nH, 33 nH, 330 nH, 3.3 µH, 33 µH, 330 µH, 3.3 mH 3.9 nH, 39 nH, 390 nH, 3.9 µH, 39 µH, 390 µH, 3.9 mH 4.7 nH, 47 nH, 470 nH, 4.7 µH, 47 µH, 470 µH, 4.7 mH 5.6 nH, 56 nH, 560 nH, 5.6 µH, 56 µH, 560 µH, 5.6 mH 6.8 nH, 68 nH, 680 nH, 6.8 µH, 68 µH, 680 µH, 6.8 mH 8.2 nH, 82 nH, 820 nH, 8.2 µH, 82 µH, 820 µH, 8.2 mH #generics #CommonPartsLibrary
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Realistic Apricot Point-of-view gun

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Properties describe core aspects of the project.

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