Ramsey Electronics BS2C Manual de instrucciones descargar pdf (Pagina 12)

DCI2 • 12

 15. Install R6, a 330K ohm resistor (brown-black-orange).

OK, that’s it for the resistors, now we’ll install the diodes. The resistors didn’t

matter which direction they were installed but diodes must be installed in the

proper direction. You will notice there is a white band on the pattern on the

circuit board. The diode’s banded side MUST be installed so the end with the

band matches the white line of the pattern.

Find the 1N4000 series diode. This should be a round black device with a

white band on one end.

 16. Install D1, a 1N400x series diode. Watch its orientation!

Next find the 4 1N4148 diodes. These are smaller than D1 and may be a

copper color with a black band.

 17. Install D2, 1N4148 diode. Watch its orientation!

 18. Install D3, another 1N4148 diode. Watch its orientation!

 19. Install D10, another 1N4148 diode. Watch its orientation!

 20. Install D11, another 1N4148 diode. Watch its orientation!

Next we’ll install two of the integrated circuits, a 74154, 4 tp 16 line decoder

and U3 an HT9170 DTMF decoder. The microprocessor, U1 will be installed

later.

 21. Install U3, the 18 pin DIP tone decoder chip marked HT9170B. Make

absolutely sure it is mounted in the proper direction. The small semi-circle

(or notch as commonly called) on the IC represents pin 1 and should be

mounted in the same direction as in the Parts Layout Diagram. The ICs in

this kit are not mounted in the same direction so look closely before

soldering it in.

 22. Next install U2 the 74154 in the same way as U3. Make sure it is

properly oriented before soldering all pins.

The next components we’ll install are the ceramic capacitors. It doesn’t matter

what direction these are installed. First locate the 0.1uF capacitors marked

104.

 23. Install C12, a 0.01uF capacitor (104)

 24. Install C10, a 0.01uF capacitor (104)

 25. Install C11, a 0.01uF capacitor (104)

 26. Install C5, a 0.01uF capacitor (104)

 27. Install C15, a 0.01uF capacitor (104)

 28. Install C14, a 0.01uF capacitor (104)

Find the two 0.01uF ceramic capacitors marked 103

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Ramsey Electronics BS2C Manual de instrucciones Pagina 12