Ramsey Electronics MR6 Bedienerhandbuch PDF herunterladen (Seite 14)

ECG1 • 14

 2. Identify J3, the 3.5mm mono jack. Again, slide this through the circuit

board and solder all three leads securely. This jack will act a monitor output

port for your kit, providing a convenient hookup for an oscilloscope to give a

visual display of an EKG waveform.

 3. Install J1, the last stereo type jack. Careful with those leads; make sure

that they all make it through the board before you solder them into place. J1

acts as the connection point for the probes to the circuit inputs.

 4. Identify C19, the 100 uF electrolytic capacitor (small cylindrical

component coated with plastic and marked 100). Electrolytic capacitors are

polarized with a (+) and (-) lead and must be installed in the correct

orientation. Ordinarily, only the negative side is marked on the capacitor

body with a dark band and the (-) sign clearly shown, while the PC boards

will usually show the (+) hole location. Use care to ensure proper polarity.

See the parts diagram for proper placement. The capacitor should fit snugly

down to the PC board. Save those long leads that you trim off to fashion

jumper connections later in the assembly.

 5. In the same manner, install C15, another 100 uF electrolytic (small

cylindrical component coated with plastic and marked 100). Electrolytic

capacitors store a large amount of charge and keep the supply voltage from

“sagging” when a large current is momentarily required. Notice on the

schematic how C15 is used in this manner; the cap stores energy so that

when the “thump” of the EKG signal is sent to the headphone, the audio

amplifier (U2) is not starved for power. Use care to ensure proper polarity.

See the parts diagram for proper placement. The capacitor should fit snugly

down to the PC board.

Now we’re getting to it! Have a look at your solder connections and retouch any

less than perfect ones. We will continue our assembly with the audio amplifier

section of the circuit, using the versatile LM386 audio amp IC. This integrated

circuit is one of the standards in today's electronic industry so don’t be

surprised to see it if you open a piece of commercial electronics gear (one with

a speaker or headphone output, of course).

 6. Install U2, the LM386 Audio Amplifier 8 pin IC (marked 386). Make sure

to align the notch or dot associated with pin one with the notch shown in the

parts layout diagram. It may be helpful to gently “rock” the IC on its side on

a hard flat surface before installing to align the rows of pins so that they

slide in easily. Don’t be afraid to use enough solder and heat for a good

solder connection, and be extra careful not to “bridge” any solder

connections together.

 7. Install C14, one of the 10 uF electrolytic capacitors (in a small

cylindrical case marked 10 uF). Remember to observe polarity with those

electrolytic capacitors! Check the parts placement diagram for correct

orientation.

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