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60TTOM

VIEW

OI

PROBE TIP

10K

PARTS

LIST

50-

(íÛ

-m:l pilot lamp (#4S,

-49,

or

similar

I

01,02-- Tronsislor

(Motorola

D!!'S.ì$93)

111-

103nn0

-olnu,

wrtt

resistor

R2- 3300 -olna, ?% satt resistor

Probe.

The electronic part of

the probe

( Fig.

1) is assembled

to fit

inside

a

plastic

tube whose inside diameter is just

large

enough to

hold

the pilot lamp. U.

The

author

used the empty plastic

case

of a

large

cheap

felt

-tip

marking pen.

If you use a similar

case, take out the

insides and clean

it

thoroughly.

Use a

27

drill to

enlarge the hole

at the pen

tip

so

that

it

will pass a 6 -32 screw.

Place

a

nut on a 11_" 6 -32 brass screw

about

"1

of the way

down its length.

Using a

file, make a sharp point of

the

end of the

screw.

The nut,

which will

secure

the

finished probe within the pen,

will

clean the threads

as it

is removed.

Fig.

1. The

probe

is

a simple

two -transistor

lamp

driver ar-

rangement.

With no signal ap-

plied, the

lamp

is lit. When

a positive voltage is applied,

to the tip, the

lamp

goes

out.

BLACK LEAD

113 -27 -ohm. 1G -wall

resistor

Misc.-

Plastic tube

or felt

-tip marker

pen V,"

inside diameter;

1%" -long brass

screw with

lockwasher and nut; flexible test leads

13" long

(one red,

one black); small

alligator

clips;

insulation.

Lay

all the probe components beside

the pen case

as shown

in Fig. 2. Trim

the

component leads

and assemble the cir-

cuit, making

sure that you don't exceed

the

inside

diameter of the plastic

case.

Use insulating tubing on leads

where re-

quired to prevent accidental shorts. Note

that the indicating

lamp does not require

a socket

and

the

leads

are soldered direct-

ly

to

its

base.

When

you have the components

as-

sembled,

slide them into

the

case from

the

rear

until the

pointed

end of

the

screw comes out as far as

possible.

Use

a

lockwasher

and

the 6 -32 nut

to secure

the screw to the case.

Be

sure that

you

Fig. 2. The

complete probe is housed in

a

plastic

tube, in this case, an old felt

-tip

marker pen. Assemble the

components

with care,

and

gently fit into the

housing.

POWER

LEA,

DS

II

R2

INSULATION

QI

RI

PROBE TIP

70

POPULAR

ELECTRONICS

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