Datasheet

Table Of Contents

FM Radio Essentials

www.kitronik.co.uk/2157

Checking Your FM Radio PCB

Check the following before you connect any batteries to your radio.

Check the bottom of the board to ensure that:

 All holes (except the four large mounting holes) are filled with the lead of a component.

 All these leads are soldered.

 Pins next to each other are not soldered together.

Check the top of the board to ensure that:

 The negative markings on the electrolytic capacitors line up with the same markings on the PCB.

 The red wire on the PP3 lead is connected to the power connector labelled ‘Red’ and the black wire on the

PP3 lead is connected to the power connector labelled ‘Black’.

 Additionally check that the resistors and capacitors are in the correct place if your board does not work.

Adding an On / Off Switch

If you wish to add a power switch, don’t solder both ends of the battery clip directly into the board, instead:

Solder one wire from the battery cage to the PCB, either black to ‘-’ or red to ‘+’.

Solder the other wire from the battery cage to the on / off switch.

Using a piece of wire, solder the remaining terminal on the on / off switch to the remaining

power connection on the PCB.