Ramsey Electronics MR6 Manual de Instruções descarregar pdf (Página 17)

ECG1 • 17

operation. Mount it as close to the board as possible without forcing it.

Carefully solder all three leads

 34. Using a scrap component lead, form a jumper wire and install in the

JMP2 holes.

 35. Install R17, 470 ohms (yellow-violet-brown).

Next we will install the LED beat indicator for the display. (L)ight (E)mitting (D)

iodes are just that, a diode junction that emits light of a particular wavelength

when forward biased. Pay close attention to the polarity of the diode as shown

in the parts layout diagram.

 36. Install LED D2. The flat side is oriented as shown in the diagram. Leave

it standing about 3/4 of an inch off of the board when soldering. After

soldering bend it over to a 90º angle at its midpoint so that it faces the

outside of the board. Observe the following diagrams for proper orientation.

 37. Identify the battery holder clip. Notice that there are two holes punched

through the metal. Fashion a small jumper wire to fit through the holes and

solder securely on the solder side of the circuit board. This will hold the

battery “holder” in place.

 38. Locate the 9 volt battery snap included with your kit. Install the black

and red wire as shown in the parts placement diagram.

Almost there! Pretty soon you will be monitoring your heart’s electrical

impulses. Even though you can hardly wait to fire up the kit, take a few minutes

to recheck your assembly up to now. Touch up any solder connections, recheck

electrolytic/diode/transistor orientations. A few minutes now can save time

tenfold once you have energized the circuit, since incorrectly installed parts can

be damaged once power is applied.

 39. Install pushbutton switch S1 by inserting all six leads through the circuit

board. The switch should fit flat to the circuit board before soldering.

 40. Identify the 10k PC mount potentiometer (labeled 103) and install it in

the R14 position.

 41. Identify the 100k PC mount potentiometer (labeled 104) and install it in

the R5 position.

Great job! You’ve made it through the circuit board assembly of your ECG kit.

Now we will work on the input probe and associated wires. First, here are a

Front View

LED

PC Board

Leave leads approximately

3/4 inch in length

Flat

Front View after Bending

LED

PC Board

Leave leads approximately

3/4 inch in length

Flat

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Ramsey Electronics MR6 Manual de Instruções Página 17

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