#Goal

- Design a 9V battery-powered blinking LED circuit that flashes a red LED at approximately 1 Hz, using through-hole components and an inline on/off switch.

#Implementation plan

1. **Add and Configure Components**

1. Select and add a NE555 timer (DIP-8 package) to the schematic.

2. Select and add a red 5mm LED with a through-hole footprint.

3. Select and add two timing resistors and one timing capacitor to set up the NE555 in astable mode for a ~1 Hz blink.

4. Select and add a series resistor for the red LED to ensure proper current limiting from the 9V supply.

5. Add a 100 nF through-hole decoupling capacitor across the 555 IC's VCC and GND.

6. Select and add a SPST inline on/off switch and a 2-pin terminal block for the 9V battery connection.

2. **Configure Circuit Connections**

1. Connect battery positive through the on/off switch to the VCC input of the NE555 and other components that require 9V.

2. Connect the NE555 timing network by wiring the resistors and capacitor to achieve an astable configuration at ~1 Hz blinking.

3. Connect the NE555 output pin to the LED with the series resistor in line. Ground the LED's cathode.

4. Place the decoupling capacitor across the VCC and GND near the NE555 timer.

5. Connect the battery negative terminal to the common ground of the circuit.

3. **Finalize and Validate Schematic

1. Verify component footprints are through-hole and suitable for hand soldering.

2. Run ERC/DRC checks to ensure proper electrical connections and no net conflicts.

3. Document all component values and connections for manufacturing output.

#Success criteria

- The schematic features a properly configured NE555 timer in astable mode at ~1 Hz blinking frequency.

- The red LED blinks once per second when powered from a 9V battery with an inline on/off switch.

- All components are through-hole and easy to hand solder.

- All connections meet design requirements and pass ERC/DRC checks.