Elenco Electronics MO-1251 Manual de usuario descargar pdf (Pagina 45)

100

PARTS

LIST

RF RECEIVER /ALERT

BEEPER

All resistors

are 1/4 -watt,

5 %, un-

less

otherwise

noted.

R1, R11, R21- 10,000

ohms

R2 -2200

ohms

R3-47

ohms

R4 -2000

ohms

-4700

ohms

R6- 470,000

ohms

R7,

R8, R22- 100,000

ohms

-6200 ohms

R10-

56,000 ohms

R12- 47,000

ohms

R13-

33,000

ohms

R14-10

megohms

R15

-6800 ohms

R16

-130 ohms

R17- 15,000

ohms

R18- 10,000

ohms, 20

-turn trimmer

potentiometer

R19-

20,000

ohms

R20

-1000 ohms

All

capacitors

are

rated

for at least

16 volts.

-5

pF,

ceramic disc

C2, C5-0.002 µF,

ceramic disc

C4-24

pF,

ceramic

disc

C6-18 pF, ceramic

disc

-0.039

µF,

metalized

film

C8, C16, C17 -10

µF, electrolytic

C3, C9,

C18 -0.01 µF, ceramic

disc

C10,

C14

-0.1

µF, metalized film

C11

-4.7

p.F,

tantalum

C12 -0.47 µF,

tantalum

C13 -100 p.F,

electrolytic

C15-1

µF,

electrolytic

Semiconductors

IC1 -LM358

op -amp

IC2

-LM567

tone

decoder

IC3

-7555

CMOS timer

IC4 -78L05

5 -volt regulator

LED1 -Red

light-

emitting diode

01-

MPSH11

NPN transistor

02- 2N3904 NPN

transistor

Other components

ANT -Telescopic

antenna or

two feet

of No. 22

hookup

wire

BZ1

-Piezo

buzzer

-SPST

switch

L1 -50

-1.1.H

choke

T1 -RF

transformer,

primary is 18

turns of

no.

magnet wire,

sec-

ondary

is 5 turns

no. 24 magnet

wire,

on 0.23 -inch diameter,

no. 43

ferrite core

Miscellaneous:

dip sockets, plastic

enclosure, SPST switch

(optional),

wire,

etc.

Note:

The following items are

available

from

the source men-

tioned in

the Sources Box. A

board

(TS2.2),

$9.35;

(TS3310), $7.95; All

components

including

semiconductors,

re-

sistors, capacitors, ferrite

beads, L1, T1, antenna wire,

dip

sockets, and a PC board (kit

RC2 -1), $29.95.

R11

-t4-

812

-C6-

,R15

{ R8

R10

C12

R14

, , 813 +

D1tRI

t n '

1C13

1R2 J

-C-

413-

-R11-

w19

R6 J

R18

-C16-

IC2

R1 +

I IC17

1 45

IC1

C15

+ Q5

rR16-

TfP2

TP3

TP1

-C11-

GND

-C1-

FIG. 7 -PARTS PLACEMENT

for the IR receiver

/RF

transmitter.

TP2

-R11 -t

IC2

¡,

BZ1

-C14-

R19

R'0

.Ç15

R21

C10

LED1% I

-R16- I

C1114

-R15

TP1

C121

-C9

R10

-C1-

ici

R14

C16/

R22

R11

C13

---J

I T1

C 6

-C18-

---------

-87-

\ \,

Ji13-

--LI-

-F-112,- --C3

SIO

FIG. 8 -PARTS

PLACEMENT for the RF receiver/alert

beeper.

thereby increasing the decoder's im-

munity

false

triggering caused by

other signals present

in the

49 -MHz

band. Therefore, RI6 is optional

and,

if installed, it

will

reduce

the max-

imum range of

the

RF system.

Capac-

itors

CII and C12

set

the decoder's

bandwidth,

and R17, R18, and C14

set the frequency

which

IC2

will

respond

(490 Hz). Pin

of IC2 goes

low when

490

-Hz tone is applied to

pin 3. At

all

other

times,

pull

-up re-

sistor R19

keeps

8 high. A high -

-low pulse

transition

at pin

is cou-

pled to IC3's

trigger input (pin 2)

through

C15.

Pull -up

resistor R21

keeps pin

2 high at all other times.

Once

triggered, IC3's output (pin 3)

goes high,

biasing

on. (Q2 func-

tions as a current

sink

for BZI.) R22

and C16 determine the length of time

that BZI sounds.

Construction

Each

of the

three circuits is as-

TANT

sembled on its own PC board and

mounted

in its own enclosure. Tem-

plates

for the hoards are provided in

PC Service. Alternatively,

etched and

drilled boards can

be purchased

from

the

source

given in the Parts List.

Use

suitable

enclosure for each

circuit.

If you intend

to use rechargeable bat-

teries as the

per supply,

sure

that

the enclosure is

large

enough for both

the PC hoard

and the batteries. If you

use an AC adapter for the

power

sup-

ply, you can use a smaller

enclosure.

Before mounting

components

the

boards, use the boards as tem-

plates

for any holes that have

drilled in the

enclosures. All 555

timer IC's are

CMOS,

suggest

that you use

dip

sockets, and wear

grounded wrist

strap

when

handling

the IC's. If you don't use IC sockets,

use a grounded

(3 -wire)

soldering

iron.

Figures

6, 7, and 8 show the Parts

Placement

diagrams for the IR trans-

1 2 ... 40 41 42 43 44 45 46 47 48 49 50 ... 99 100

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Elenco Electronics MO-1251 Manual de usuario Pagina 45

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