Red LED Blinker Circuit Design
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6:52
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Created 5 tasks.
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1/5 Rename project and create a concise design record
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2/5 Select through-hole components and calculate 1 Hz 555 timing/current values
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Ran calculation.
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Found 2 results for NE555 or LM555 timer IC in through-hole DIP-8 package for 9V astable LED blinker, hand solderable, common hobby part.
Found 2 results for red through-hole 5mm LED hand solderable indicator for 9V 555 timer blinker.
Found 3 results for through-hole SPST slide switch or toggle switch for 9V battery on off power switch hand solderable.
Found 3 results for 9V battery snap connector or clip through-hole leads for PCB power input hand solderable.
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Found 3 results for Generic Resistor.
Found 3 results for Generic Capacitor.
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3/5 Add hand-solderable components to the schematic
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4/5 Wire 9V battery, switch, 555 astable, decoupling, and LED output
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5/5 Run schematic review and fix violations
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Completed design checks — found 18 issues.
Read schematic.
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Completed design checks — found 11 issues.
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5/5 tasks completed.
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Finished working
- Blink a red LED about once per second.
- Powered from a 9V block battery.
- Include an on/off switch.
- Use easy-to-hand-solder through-hole components.
- 555 timer in astable mode powered directly from switched 9V.
- Red LED driven from the 555 output through a current-limiting resistor.
- Required 555 support parts included: control-pin bypass capacitor, local 100nF decoupling capacitor, and 10uF bulk capacitor.
- U1: NE555P, DIP-8 through-hole timer.
- BT1: Keystone 967 9V battery snap connector.
- SW1: Through-hole SPST power switch.
- D1: LTL-307EE red 5mm through-hole LED.
- R1: 1kΩ axial resistor, astable charge resistor.
- R2: 680kΩ axial resistor, astable discharge/timing resistor.
- R3: 680Ω axial resistor, LED current limit.
- C1: 1µF radial capacitor, astable timing capacitor.
- C2: 10nF disc capacitor, 555 control-pin bypass.
- C3: 100nF disc capacitor, 555 VCC decoupling.
- C4: 10µF radial capacitor, switched 9V bulk capacitor.
- 555 astable frequency with R1 = 1kΩ, R2 = 680kΩ, C1 = 1µF: about 1.06Hz.
- Period: about 0.94s.
- Approximate LED current using 9V supply, ~2V red LED, and estimated 555 high-level drop: about 8.1mA.
- Estimated total switched-rail load: about 15mA peak including NE555 operating current and LED current.
- BT1 positive feeds SW1 COM; SW1 NO creates the switched 9V rail.
- U1 VCC and RESET are tied to switched 9V; U1 GND goes to battery negative/GND.
- Astable: R1 from switched 9V to DISCH, R2 from DISCH to the TRIG/THRES timing node, C1 from timing node to GND.
- Pin 5 CONTROL is bypassed to GND by C2.
- C3 and C4 connect from switched 9V to GND near U1.
- U1 OUT drives R3 then D1 anode; D1 cathode returns to GND.
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