Assembly step by step:
1. Install Resistors R1, R2, R3 and R4 as shown in the PCB Board Layout using
their color codes to identify them. The leads can go in either way.
Solder the resistors in place and trim the leads with the diagonal cutters.
2. Install Capacitor C1 as shown on the PCB Layout. C1 is a polarized capacitor
and must be placed with its shorter lead, indicating the negative side in the
hole marked with a minus sign. The white line on the side of the capacitor also
indicates the negative side. Solder C1 in place and trim the leads
3. Install the Potentiometer P1 as shown. Solder P1 in place and trim the leads.
4. Install LED1 and LED2 with their short lead in the hole with the minus sign.
The short lead is the cathode side. Solder the LEDs in place and trim the leads.
5. Install the socket for the LM555 timer IC with the small notch as shown in the
PCB Board Layout. Solder the socket pins in place.
Install the LM555 timer on the dip socket with the notches on the LM555 and
the socket on the same side.
6. To install the 9V battery clip, first pass the wires from the bottom side through
the holes adjacent to the battery solder pads and then into the solder pads.
Connect the red wire to the + and the black wire to the – connection on the board
Solder the wires in place.
7. Before connecting the battery to the circuit, review your work as per the As-
sembly Check out.
PCB Layout
Schematics
