Ramsey Electronics MR6 Manual de instrucciones descargar pdf (Pagina 13)

ECG1 • 13

ECG1 ELECTROCARDIOGRAM KIT ASSEMBLY

Although we know that you are anxious to complete the assembly of your

electrocardiogram 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 the majority

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.

Although not necessary, you may install an IC socket in the U1 position.

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.

Now we will install the input and output connectors of the circuit. We use

several printed circuit (PC) type jacks to accomplish our interfaces. These

jacks typically have several mounting pins associated with each connector.

Notice on the schematic how these connectors use extra contacts as switches

so that when the plug is inserted the contacts will open. That’s how your

transistor radio turns off the speaker when you plug in your headphones!

 1. Identify and install audio connector J2, 3.5mm stereo, towards the

rear of the printed circuit board. Gently slide the leads through the board

until the connector is mounted flush, with the connection hole facing

towards the outside of the PC board. Solder all the connections using

enough heat to flow the ground connection completely. This may take a

little while depending on the wattage of your soldering pencil. Use caution

when soldering the other leads so that too much time or heat is not

applied; it may cause the printed circuit trace to lift away from the circuit

board.

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Ramsey Electronics MR6 Manual de instrucciones Pagina 13