Each circuit uses a 16 x 2 LCD display. The PCB is shown in figure 3.
Q1 is the 7805 voltage regulator. Place the component into position.
Bend the 7805 so that it lies flat on the board, see figure 4. Then solder into position. Continue to mount and solder the components into position on the PC board.
We substitute a 75-ohm resistor for the resistor marked 1.2K on the pc board. The 10K resistor by the white silkscreen option box on the front of the pc board is NOT mounted to the board. Leave this component space open. Mount and solder the other four 10K resistors and the 4.7K resistor. The 20K pc mounted potentiometer is mounted on he back on the PC board, see figure 5.
