Ramsey Electronics URC1 Instruction Manual download pdf (Page 17)

WSR-1A• 17

 101. Install C16, another 10uF electrolytic capacitor. Check polarity!

 102. Install R14, a 3.3K ohm resistor (orange-orange-red).

Now it is time to begin installing the microcontroller and associated circuitry. If

you haven't already, take a break and grab a Coke, relax, and get ready to

finish up the rest of your weather satellite receiver. Also check your previous

work for solder bridges and cold solder joints.

 103. Install C52, a 220 pF ceramic capacitor (marked 220, or 221)

 104. Install R35, a 1K ohm resistor (brown-black-red).

 105. Install C48, a .01uF ceramic capacitor (marked .01, 103, or 10n).

 106. Install R21, a 1K ohm resistor (brown-black-red).

 107. Install Q5, a 2N3904 NPN type general purpose transistor. Make sure

that it is oriented properly!

 108. Install R34, a 1K ohm resistor (brown-black-red).

 109. Install U5, the 74HC138 3 to 8 line decoder. This chip is responsible

for lighting the eight LEDs we will be installing later. Be sure to install it in

the correct direction! Verify that all pins are through the board before

soldering!

 110. Install R32, a 470 ohm resistor (yellow-violet-brown).It is necessary to

connect R32 to the trace next to it on the topside of the PC board. Carefully

scrape away the solder mask on the trace and connect it to R32 with a

scrap component lead or a small glob of solder. (see parts layout, page 35)

 111. Install the 16 pin IC socket, verify that all pins are through the board,

then solder. Install U4, the microcontroller (marked with a sticker with WSR-

1A on it). Make sure and orient the microcontroller correctly, as these must

be ordered from the factory if ruined.

 112. Install C49, a 10uF electrolytic capacitor. (Pay attention to orientation).

 113. Install R33, a 10K ohm resistor (brown-black-orange).

 114. Install R31, a 1K ohm resistor (brown-black-red).

 115. Install C47, a .01uF ceramic capacitor (marked .01, 10n, or 103).

It is time to build the power supply and audio switching circuitry. The audio

switching turns off audio when there is no signal present to prevent some

computer interfaces from activating when there is no signal present.

 116. Install C50, a 10uF electrolytic capacitor. Pay attention to the

orientation!

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Ramsey Electronics URC1 Instruction Manual Page 17