LED Circuit Design

flux

The last ERC issue is fixed by adding a standard 10 nF capacitor on the 555 control pin. The circuit now includes both 100 nF supply decoupling and 10 nF control bypassing, which makes the oscillator more stable on a 9 V battery supply.

flux

Work done
  • Added the full 9 V blinker schematic: J1 battery snap, SW1 on/off switch, U1 555 timer, R1, R2, C1 timing network, R3 + LED1 output stage, and C2 + C3 for 555 stability.
  • Wired the circuit completely: battery positive goes through SW1 to the switched 9 V rail, U1 is configured in astable mode, and the LED stage is connected to the timer output with correct polarity.
  • Chose beginner-friendly through-hole parts and timing values of 10 kΩ, 68 kΩ, and 10 uF, which calculate to about 0.99 Hz, very close to the target one blink per second.
  • Reviewed ERC and fixed the only issue by adding the standard control-pin bypass capacitor.
Success criteria review
  • ✅ The circuit powers from a 9 V battery through a user-accessible SW1 on/off switch.
  • ✅ The 555 astable around U1 is configured for approximately 1 Hz blinking.
  • ✅ All parts are simple, basic, and hand-solderable through-hole components.
  • ✅ The schematic is fully connected and ERC checks are clean.
Next steps If you want, I can next set up a simple PCB layout for these parts with generous spacing for hand soldering.
Add it now
Use through-hole parts
Target 1 Hz blink
Choose LED resistor
Review connections
R2 P2 - U1 THR
R1 P2 - R2 P1
U1 Q - R3 P1
R2 P2 - U1 THR
R2 P2 - U1 THR
SW1 2 - U1 VCC
SW1 2 - U1 VCC
SW1 2 - U1 VCC
SW1 2 - U1 VCC
R3 P2 - LED1 A
R1 P2 - R2 P1
R2 P2 - U1 THR
J1 POS - SW1 1
U1 CV - C3 P1
U1 Q - R3 P1
SW1 2 - U1 VCC
R3 P2 - LED1 A
R1 P2 - R2 P1
J1 POS - SW1 1
U1 CV - C3 P1
GND
LED1
C1
Capacitance
10uF
J1
SW1
C2
Capacitance
100nF
C3
Capacitance
10nF
U1
GND
GND
GND
R2
Resistance
68kΩ
GND
GND
R3
Resistance
470 Ω
R1
Resistance
10kΩ
  • Generic Inductor
    Generic Inductor
    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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  • Generic Capacitor
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  • Generic Resistor
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  • Ground
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    A common return path for electric current. Commonly known as ground.
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  • Terminal
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    An electrical connector acting as reusable interface to a conductor and creating a point where external circuits can be connected.
    natarius
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    Wirelessly connects nets on schematic. Used to organize schematics and separate functional blocks. To wirelessly connect net portals, give them same designator. #portal
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  • RMCF0805JT47K0
    RMCF0805JT47K0
    General Purpose Thick Film Standard Power and High-Power Chip Resistor 47 kOhms ±5% 0.125W, 1/8W Chip Resistor 0805 (2012 Metric) Automotive AEC-Q200 Thick Film Features: - RMCF – standard power ratings - RMCP – high power ratings - Nickel barrier terminations standard - Power derating from 100% at 70ºC to zero at +155ºC - RoHS compliant, REACH compliant, and halogen free - AEC-Q200 compliant
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  • 875105359001
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    10 µF 16 V Aluminum - Polymer Capacitors Radial, Can - SMD 30mOhm 2000 Hrs @ 105°C #commonpartslibrary #capacitor #aluminumpolymer #radialcan
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  • CTL1206FYW1T
    CTL1206FYW1T
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  • 1070TR
    1070TR
    Battery Holder (Open) Coin, 20.0mm 1 Cell SMD (SMT) Tab bate or batt #forLedBlink
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9V LED Blinker thumbnail
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Properties

Properties describe core aspects of the project.

Pricing & Availability

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$3.65–$5.56

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