Ramsey Electronics MR6 Manual de instrucciones descargar pdf (Pagina 15)

ECG1 • 15

 8. Install R16, 2 ohms (red-black-gold).

 9. Install C18, .1 µF disc capacitor (marked 104 or .1). Disc capacitors are

not polarized; they can be installed in either direction. The reason we call

them “disc” caps can be seen in the package. The capacitor itself is two

conductive discs separated by a dielectric compound.

Take a moment now to check your previous solder joints for “opens” where the

solder did not completely flow around the connection, or solder bridges between

closely spaced pads or IC pins. It seems the best time to identify these types of

problems is now when you’re focused on this section of the board, saving you

time to try to retrace your steps later.

 10. Install C13, 10 uF electrolytic capacitors (in a small cylindrical case

marked 10 uF). Check the parts placement diagram for correct orientation.

Watch that polarity!

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

JMP3 holes. Jumpers act like electronic “bridges” that carry power or

signals over active traces on the circuit trace side of the board. Solder both

ends of the jumper into place.

 12. Install C3, 10 uF electrolytic capacitor (in a small cylindrical case

marked 10 uF). Check the parts placement diagram for correct orientation.

 13. Install R13, 10k ohms (brown-black-orange).

Next we will move on to the amplifier section of the kit, constructing the

differential amplifier and associated circuitry. We will continue from the rear of

the circuit board and work our way forward. Remember to keep the lead lengths

as short as possible (to avoid any noise being introduced in the circuit). Also,

keep a few more of those scrap leads handy as we will need a few more jumper

wires later.

 14. Install C1 and C2, both .1 µF disc capacitor (marked 104 or .1).

 15. Install R1 and R2, both 10 M ohms (brown-black-blue). 10 meg, that’s

10 million ohms!

 16. Install R3 and R4, 10 k ohms (brown-black-orange). These resistors

form a “voltage divider” that sets the input voltage for our op-amp inputs.

 17. Install U1, the LM324 Quad Op-Amp 14 pin IC (marked 324). 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.

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Ramsey Electronics MR6 Manual de instrucciones Pagina 15