Metra Electronics DAT Combo Manuel d'utilisateur télécharger pdf (Page 108)

Personal Hi

-Fi

Continued

from ¡age i4

J2 are mounted

directly on one metal

panel,

and the stereo

headphone

jack (J3) is

mounted

directly on the

other

metal

panel -

no insulating washers

are

necessary.

Re-

sistors R1

and

R2,

and transistors Q1

and

Q2,

are all mounted by their

own leads, and

no spaghetti (insulating

tubing) is

needed

you keep all leads well

apart.

When solder-

ing the transistor

leads,

use

a pair of long -

nose

pliers as

heat sink.

How It Works. The

PS -15 low-

voltage

DC source feeds

a current through the

piezo-

resistive

elements in the phono cartridge. As

the stylus rides in the stereo record grooves,

the

piezoresistive

elements are

flexed

and

stretched

and

act

rapidly varying resis-

tances. The

varying

currents from the car-

tridge are given one stage of transistor AF

amplification in the PS -15 unit.

The

output

from the

-15 is fed into the

input

of our little headphone driver and

given another stage of transistor AF ampli-

fication to drive the stereo headphones. The

two 2.2K (2200 ohms)

resistors (R1,

R2)

provide base biás for Q1 and Q2; you

might

experiment

with other values for best results

with your

particular

transistors.

The amplifier is turned

off

simply

by pull-

ing the headphone

plug

out of

the jack.

Photo shows

all necessary

dimensions

for

duplicating

author's

unit.

If you

prefer,

amplifier

can

be mounted

small

Minibox.

116

The

Body's Ills

Continued from page 41

ulus

blocks

pain

stimuli

coming from other

parts of the body and

prevents their travel-

ing on

to the

brain.

Still

experimental, it

promises

to ease suffering now relieved

only

narcotics or

dangerous operations.

Another remedial

operation that

can be

ruled out

is the

one

often

necessitated

by ac-

cidental swallowing

ferrous object.

Gen-

eral Electric engineers

have

come up

with

gadget

that has already

removed

a padlock,

coffee -can key, coins,

pins, dental

burrs,

hypodermic

needles,

and metal toys

from in-

nocent human tummies.

About 30 in. long

and

IA -in.

diameter,

the new

wizard

consists

a stainless

steel

cable

in a plastic tube

and ends

with

iron

tip.

When

the magnet

at the end of the

con-

trol cable is

slid forward until

it touches

the

iron tip,

the tip magnetizes. When

the

per-

manent

magnet is retracted

into

magnetic

shield,

the

tip loses its magnetism.

important breakthrough,

the new in-

strument

can retrieve

foreign

objects

in a

matter of

two to three

minutes. No anesthe-

sia is

needed,

and a general

practitioner re-

quires

the

help

only

fluoroscope.

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Metra Electronics DAT Combo Manuel d'utilisateur Page 108

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