DTMF Controller kit it is best to follow the step-by-step instructions in this manual. Try to avoid the urge to jump ahead installing components. Since you may appreciate some warm-up soldering practice as well as a chance to put some landmarks on the PC board, we’ll first install some of the larger mounting components. This will also help us to get acquainted with the up-down, left-right orientation of the circuit board. Remember that all of the components will be mounted on the component side of the circuit board and soldered on the solder side of the circuit board (the side that contains the printed circuit traces). Have a look at the parts layout diagram to help with your assembly.
Use the boxes to check off your progress. Check all received parts against the parts list. The parts list describes the various markings that may be found on the kit parts. Carefully sort the parts into small piles, (an empty egg tray does nicely for this purpose) to aid in finding the correct part at the required time. Today's IC’s have achieved remarkable performance levels and it is extremely unlikely that any of your chips will have problems, yet we know that some of our hobbyists insist on socketing all IC components.
The addition of these will not “void” your warranty, but if a problem arises from a socketed component you will be required to pay the additional technician fee for labor in the repair of your kit, if necessary. We will begin by installing the input and output connectors on the rear side of the circuit board. These will act as our landmark components and make the orientation of the rest of the parts a bit easier. Proper Component Installation: NOTE: All of the diodes and resistors used in the kit will be installed in a stand up fashion. This means one lead will go straight into the board while the other is bent around to go back down into the other hole.
The straight lead goes into the hole with the silk-screened circle around it on the circuit board. Enough of that ... let’s get started! DCI2 10