Ramsey Electronics AR2 Manual de Instruções descarregar pdf (Página 13)

ABM1 • 13

on one end of the part; this corresponds to the notch on the IC and shows

you which way to place the part. Line up the notches and make sure that

all pins are through the board. With no other parts installed (other than

surface mount) you can have the part sit flat on your bench and the board

will hold U3 in place. That way the part will sit flat on the board. That’s why

we’re putting the ICs in first! We typically solder the two corner pins, flip

the board over to check placement, then solder the rest. Be sure to solder

all 8 pins.

 Install U4, the LM386 audio amplifier IC. It’s located next to U2. Again,

line up the notch on the part with the notch marked on the board, make

sure the part is seated flat, then solder all 8 pins.

ANTENNA INPUT/AUDIO OUTPUT CIRCUIT

 Install J1, the 3.5mm phone jack. It is located on the narrow edge of the

board closest to U3. Make sure the part is flush to the board and square

to the edges. The part will tend to rotate counter-clockwise from square.

Solder all three pins.

 Install L1, 12 uH inductor (brown-red-black-silver). L1 looks like a resistor

but is a bit larger. This part can be installed in either direction. It is

located next to J1. Make sure it does not cover any part of the mounting

hole.

 Install L2, 12 uH inductor (brown-red-black-silver). Like L1 it can be

installed in either direction.

BAND-PASS FILTER

 Install C1, 1nF ceramic disk capacitor (marked 102). Disc capacitors have

no polarity so they can be installed in either direction.

 M1 and M2 are inductors that are made with foil runs on the board. There

are no actual components to install.

 Install C2, 68pF ceramic disk capacitor (marked 68).

 Install L3, 0.41uH 11t air core inductor (11 turns of wire). Again, this part

can be installed in either direction. It will not sit flat on the board. Push it

down gently until the leads are snug (do not crush the coil). It should be

no higher than 1/8th of an inch.

 Install C3, 2.2 pF ceramic disk capacitor (marked 2.2). It is very important

that this part is placed as close to the board as possible. You may need

to use pliers to pre-bend the leads.

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Ramsey Electronics AR2 Manual de Instruções Página 13