Step 1: Open the Enclosure
Step 2: Cut Open the Components Bag
Step 3: Empty Bag Contents
Step 4: Place and Solder 28 Pin DIP Socket [U1]
Note:The small impression must be near the right edge of the circuit board.
Step 5: Attach the Fuse Holders to the Fuse
Step 6: Place and Solder the Fuse [F1]
Step 7: Cover the 2-pin Jumper Headers With Their White Covers
Step 8: Place and Solder the Jumpers [J2, J3]
Step 9: Place and Solder 7 Segement Display [D1]
Step 10: Place and Solder DC Barrel Jack [CONN1]
Step 11: Place and Solder AC Power Cord Receptacle [CONN2]
Step 12: Place and Solder Decoupling Capacitors [C4, C5]
Note:Orient the minus sign on capacitors to the bottom of the circuit board
Step 13: Place and Solder the Bridge Rectifier [U3]
Note:Orient the + sign towards the top of the circuit board
Step 14: Place and Solder 300 Ohm Resistors [R1, R2, R3]
Step 15: Place and Solder 25k Ohm Resistor [R4]
Step 16: Place and Solder 470 Ohm Resistor [R5]
Step 17: Squeeze Your Microcontroller Leads to Fit the IC Socket [U1]
Note: I like to hold the chip at a slight angle and gently press the leads in
Step 18: This Is the Amount of Curve You Are Looking for on the Leads.
Step 19: Place the Microcontroller Into the DIP 28 Socket [U1]
Note:The small divot in the chip should be facing the right side of the board
Step 20: Place and Solder the 7805 5v Regulator [U2]
Note:Orient the text side towards the lower circuit board
Step 21: Step 21: Place and Solder the 9v Protection Diode [D2]
Note:Orient the black line on the diode to match the silkscreen (left side)
Step 22: Place and Solder the Slide Switch [S1]
Step 23: Place and Solder Large Charge Capacitors [C1, C2, C3]
Step 24: Place and Solder Large Black Rocker Switch [S2]
Note:Match the 0 / 1 orientation on the silkscreen.
Step 25: Clip Battery Lead to 2" in Length. Twist and Tin the Leads.
Step 26: Solder 9v Battery Cap
Note:Left is negative (black), Right is positive (red) as the silkscreen indicates.
Step 27: Nsert Assembled PCB Into Enclosure
Note:Align cable plug holes then press hard on opposite side of PCB for secure fit. It will be a little uneven as the retailer I've been buying enclosures from has changed models