Elenco AM Radio Kit Manuel d'utilisateur télécharger pdf (Page 6)

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CONSTRUCTION

Introduction

Assembly of your AM-550 AM Radio Kit will prove to be an exciting project and give you much

satisfaction and personal achievement. If you have experience in soldering and wiring

techniques, then you should have no problem with the assembly of this kit. Care must be given

to identifying the proper components and in good soldering habits. Above all, take your time

and follow these easy step-by-step instructions. Remember, “An ounce of prevention is worth

a pound of cure”. Avoid making mistakes and no problems will occur.

Safety Procedures

• Wear eye protection when soldering and during all phases of construction.

• Locate soldering iron in an area where you do not have to go around it or reach over it.

• Do not hold solder in your mouth. Wash your hands thoroughly after handling solder.

• Be sure that there is adequate ventilation present.

Assemble Components

In all of the following assembly steps, the components must be installed on the top side of the

PC board unless otherwise indicated. The top legend shows where each component goes.

The leads pass through the corresponding holes and the board is turned to solder the

component leads on the foil side. Solder immediately unless the pad is adjacent to another

hole which will interfere with the placement of the other component. Cut excessive leads with

a diagonal cutter. Then, place a check mark in the box provided next to each step to indicate

that the step is completed. Be sure to save the extra leads for use as jumper wires if needed.

Soldering

The most important factor in assembling your AM radio kit is good soldering techniques. Using

the proper soldering iron is of prime importance. A small pencil type soldering iron of 25 - 40

watts is recommended. The tip of the iron must be kept clean at all times and well tinned.

Many areas on the PC board are close together and care must be given not to form solder

shorts. Size and care of the tip will eliminate problems.

For a good soldering job, the areas being soldered must be heated sufficiently so that the

solder flows freely. Apply the solder simultaneously to the component lead and the component

pad on the PC board so that good solder flow will occur. Be sure that the lead extends through

the solder smoothly indicating a good solder joint. Use only rosin core solder.

DO NOT USE ACID CORE SOLDER! Do not blob the solder over the lead because this can

result in a cold solder joint.

Heat Sinking

Electronic components such as transistors,

IC’s, and diodes can be damaged by the heat

during soldering. Heat sinking is a way of

reducing the heat on the components while

soldering. Dissipating the heat can be

achieved by using long nose pliers, an alligator

clip, or a special heat dissipating clip. The heat

sink should be held on the component lead

between the part and the solder joint.

Mount Part

Bend Leads to Hold Part Solder and Cut Off Leads

Foil Side

Rx - 100Ω 5% 1/4W Resistor

(brown-black-brown-gold)

Heat Sink

(this can be ordered as part of Elenco’s Solder Ease

Kit Model SE-1).

Soldering Iron

Solder

Heat Sensitive

Component (Diode)

PC Board

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Elenco AM Radio Kit Manuel d'utilisateur Page 6

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