Ramsey Electronics BS2C Manual de instrucciones descargar pdf (Pagina 13)

DCI2 • 13

 29. Install C2, a 0.01uF capacitor (103)

 30. Install C6, a 0.01uF capacitor (103)

Find the two 22pF ceramic capacitors marked 22

 31. Install C7, a 22pF capacitor (22)

 32. Install C8, a 22pF capacitor (22)

The last ceramic capacitor you have should be 470pF marked 470

 33. Install C1, a 470pF capacitor (470)

 34. Install VR1, the 7805 voltage regulator. Install the three leads as shown

on the silkscreen and gently bend the part over to match the silkscreen

layout and then solder all three leads. This part “smoothes” out any ripple

that may still be present on the main input supply voltage and provides us

with the needed 5 VDC the ICs operate on.

 35. Install Q7, a three leaded transistor marked 2N3904. The flat side must

be placed as shown on the PC board silkscreen. Look at the Parts Layout

Diagram for further clarification. When you insert it, mount it as close to the

board as possible without forcing it.

 Install Q6, another 2N3904 transistor in the same way.

 36. Identify and install the power connector J5, the 2.1 mm DC power jack

at the edge of the PC board. Gently slide the leads through the component

side of the circuit board until the connector is mounted flush. Solder all

three connections using enough heat to flow the ground connection

completely.

 37. Install the 20 pin DIP socket for U1, the 68HC908JK1 micro-controller

IC. It doesn’t matter which way the socket is orientated, as long as the chip

is place in the socket the correctly. You can bend two of the corner leads

out slightly to hold the socket in place when you flip the board over to

solder it in. Make sure all 20 pins are through the holes and then solder

each one. Check your solder joints for even flow before moving on.

The next two capacitors are called electrolytic capacitors and it is very

important they be installed in the proper direction. The pattern on the circuit

board has a “+” printed near one of the lead holes. This indicates where the

positive or “+” lead of the capacitor must be inserted. The capacitors usually

have the negative lead marked with either /or a vertical stripe or “-” sign. The

lead nearest this marking must be placed in the hole away form the “+” sign on

the board. Yea I know, why didn’t we/they mark things the same way? Well

there is no real reason other than this is the way these components and circuit

boards are usually made. To make it even more confusing, the capacitors

sometimes have the positive lead marked, but this is usually not the case with

the style of component used in this kit.

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Ramsey Electronics BS2C Manual de instrucciones Pagina 13