A Blinking LED


Make a circuit that blinks a red LED once per second.
Power it with a 9V block battery through an on/off switch.
Use components that are easy to hand-solder.
I’ll build a hand-solderable 9V battery LED blinker using a 555 timer, add the on/off switch and LED current limiting, then run an electrical check.
I’m selecting through-hole parts: a DIP 555 timer, red THT LED, SPST power switch, and 9V battery connection, with through-hole passives for timing and decoupling.
Parts are selected: TI NE555P in PDIP-8, a through-hole red LED, a through-hole slide switch, and a PCB 9V battery holder. I’m adding them now with through-hole timing/decoupling parts.
The parts are in place and the generic passives are configured as through-hole. I’m wiring the 555 astable now: ~1.06 Hz with a 1kΩ/680kΩ/1µF timing network.
The schematic is now wired. I’m verifying the netlist and ERC checks, including the 555 mandatory reset, control bypass, and supply decoupling connections.
Implemented the 9V hand-solderable red LED blinker schematic using a TI NE555P DIP-8, through-hole LED, slide switch, PP3 9V battery holder, axial resistors, and through-hole capacitors. The 555 astable is set to about 1.06 Hz with ~50% duty cycle, so the LED blinks roughly once per second; electrical connectivity checks are clean.
Open items:
  • PCB layout/routing is not done yet, so airwire DRC errors are expected.
  • Generic passives have through-hole packages and values, but not exact manufacturer part numbers yet.
Suggested next steps:
  1. Assign exact MPNs for the generic resistors/capacitors if you want a manufacturable BOM.
  2. Move into PCB layout: size the board, place the battery holder/switch/LED, then route.
  3. Add silkscreen labels for battery polarity, switch ON/OFF, and LED orientation.
BOM and layout
Assign passive MPNs
Start PCB layout
Route the board
Add silkscreen labels

Demo Complete

The demo is finished. It didn't use any of your included AI usage. This is a real Flux project now, you can continue working on it.


U1
C3
Capacitance
100nF
C2
Capacitance
10nF
C1
Capacitance
1uF
C4
Capacitance
10uF
R3
Resistance
1kΩ
BT1
SW1
R2
Resistance
680kΩ
R1
Resistance
1kΩ
D1

9V LED Blinker

9V LED Blinker thumbnail