Epson L90P - TM Two-color Thermal Line Printer Manual de usuario descargar pdf (Pagina 29)

Fig. 7. The wireless microphone

built perf-board style as

shown

here.

Also shown

the suggested

component

place-

ment. However

the

circuit is

built, observe good r.f. wiring

practice for

best

results.

The

perf board

notched

at the

corners

fit

the plastic

case.

depending on the type and

location

receiver

antenna used.

The

unit

has high

speech quality and low current drain.

conventional

9 -volt transistor

radio

bat-

tery

provides

the power.

The

antenna

length has been

limited

keep radiation

within

the

FCC regulations for wireless

microphones.

Any

type

of neat construction can be

used

build the wireless

microphone,

but,

if you want

duplicate the

au-

thor's

version, make a perf board

that shown

in Fig. 7.

The corners

of the

plastic board are

cut so that

the com-

pleted mike will

fit within

the case.

This

figure

also

shows the

location of

the vari-

ous components.

Coil

LZ is made of 6 turns

of #12

wire,

with

an inside

diameter of 'íc"

and an

overall

length of

". The antenna

tap

1! _ turns from the cold (C6)

side.

Tuning capacitor C7

is soldered

directly

to the

top side of the

first and

last coil

turns and is physically arranged

so that

Fig. 8.

Overall dimensions of

the

wireless

microphone chassis.

The

perf

board

is mounted

stand-

offs,

while battery

secured

metal

clamp at

one

end.

Flex-

ible leads couple the

circuit to

three

case -mounted

components.

April,

1969

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