Memorex CP8 TURBO UNIVERSAL REMOTE CONTROL Manual de usuario descargar pdf (Pagina 32)

36

CR-61

0+

Fig.

4 -Once

you've obtained the

board and

collected all

the

parts shown in the Parts

List,

begin construction following

this guide. Note:

the CD4584 hex

Schmitt trigger,

U1, can be replaced

by the MC14584

or

the

CD40106,

should

you have

difficulty in

obtaining

the unit

specified.

output of

U12.

As shown in

Fig.2, the other input of

U15c

is

enabled by

the clock after the second roll. If seven is rolled

after the first roll, LEDI5

comes on, indicating that you've

lost.

The "point" numbers

are also decoded by

U12

and

appear

on

the inputs of U13. A pulse from

U7b (at the end of the first

roll) latches

the point number presented

to U13.

The

"point"

number is displayed on one

of the LED's representing

the

point (4,

5, 6, 8, 9,

or

10). The number is held in

display until

the game is reset and

a

new point

is rolled.

Anytime

a

first

roll

win

or loss is recorded,

or craps is

rolled, the output

of U14a at pin IO is fed

to pin 6 of U2b. The

other leg of

U2b goes positive only after the first

roll

(refer

to

Fig.

2,) and stays positive until reset.

The output of U2b feeds

a positive signal

through D4 and D7,

disabling the os-

cillators. The dice can not be rolled

again until the game is

reset.

As pointed

out earlier,

be careful

that you stop shooting

when

you

make your point

and the

WIN

lamp comes

on, or

you

could lose

even after making

your point.

The outputs

of U5 and

U6 is converted by

U16a/U16c /U17c

and Ul7d/U16b

/U16d (respectively)

to

a code that causes the

proper LEDs

to light

when

the output of the

gate tied to its

anode

goes high.

The

total current drain for

the game is about 150

-mA

maximum with

all spots

lit on each

dice. A 5 -volt regulator,

U18, is

used to regulate

the supply voltage

from

a plug -in

wall

-type

power supply.

Use at least a

500

-mA

supply. The

source

voltage

is filtered

by C14 prior

to being input to

U18 (a

7805

5 -volt,

1 -A regulator).

The regulator

output is filtered

by

Cl and de- glitched

by bypass

capacitors

CS through

C13.

Putting

It Together

The author built

the prototype

of

Computerized

Craps on a

double

-sided, printed

-circuit

board (see

photos) -a supplier

of which

is given in

the Parts List.

But for

those of you who

like

to roll your

own,

a foil pattern for

the printed-

circuit

board is

shown in Fig.

3 (the upper one

being the component

side of

the board

and the lower

the foil side of

the board).

Once you've

obtained

the board and

collected all

the parts

shown in

the Parts List,

begin construction.

Place

and solder

the components

on the board, beginning

with

the passive

components, guided

by the

part- placement

diagram

shown in Fig. 4.

Note: The

CD4584 hex Schmitt

trigger, Ul,

can be replaced

by the MC14584 or

the CD40106

should

you have difficulty

in obtaining

the unit specified.

Once the

board is fully populated

and you are satisfied

that

the

circuit contains no

defects, apply power

and press S2 to

reset the game.

Then press S1

to

"roll"

the dice. The

circuit

cycles, LEDs

flashing, finally

coming to a stop

at some

random

number, which

is

displayed by the dice. If

the

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