Knocker Board V4 – Construction details.

Take the PCB make sure it is clean and free from dirt. Remove any tags from around the edge

Insert the IC socket in the PCB, ensure that the cut out on the socket, matches the cut out on the PCB silkscreen. Slightly bend the legs to hold it in place as you solder it in.

Insert the 330 Ohm Resistor (Orange Orange Brown), the 100 Ohm Resistor (Brown Black Brown) and the the 100K Ohm Resistor (Brown Black Yellow) into the positions shown, again slightly bend the legs of the resistors to hold them in place whilst soldering. Cut the remainder of the legs of the resistors off close to the PCB after soldering.

Insert and solder the diode into the PCB, ensure that the cathode (silver stripe) goes to the square pad on the PCB. Cut the remainder of the legs of the diode off close to the PCB after soldering.

Insert the 4 100nF capacitors and the regulator into the PCB

Note On V4 boards only, the PCB symbol is wrong please install the Regulator as shown below.

Insert and solder the LED into the PCB where shown, ensure the cathode (short leg) goes into the square pad on the PCB. Cut the remainder of the legs off close to the PCB after soldering.

Insert and solder the two push buttons into the PCB where shown.

Insert the capacitor into the PCB, ensure that the -ve band on the capacitor is over the white filled half of the symbol on the PCB silkscreen.

Solder in the transistor as shown and bend over to meet the PCB. Unless you want to run the PCB from multiple sources, J2 is not used. (see the guide to usage) Then solder in the terminal strips as shown.

Apply power 12v to the supply connector, ensuring that the polarity is correct and check that between pin1 and pin 8 on the IC you have 5V. If not, or if any component gets hot, investigate the cause.

If all is OK insert the IC ensuring that the cut out on the IC matches the Cut out on the socket