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NEW

HOLLOW

SHAFT

nutdrìver

set

Oh lockout/Screw

atliusling

lealure

Speeds,

simplifies

setting

of combination

lock

-nut /slotted

screw adjustments

on rheostats

and

similar controls

used

in a wide variety

of

electrical and

electronic

equipment.

Handle

is drilled

so you can

run an 8"

screwdriver

blade

right

through

its center

and down

through the hollow

nut -

driver shaft.

Ideal for all

-round production,

maintenance, and

service work,

this new HSC

-1 Set contains

eight

interchangeable

hollow nutdriver

shafts

in the most popular hex

opening sizes from

thru j6"

Really compact!

Set

is small

enough, light

enough to carry

in your hip pocket.

Sturdy,

see -

thru,

plastic carrying case

doubles as a

bench stand.

XCELITE,

INC.

20

BANK

ST., ORCHARD PARK,

N. Y.

14127

Send Bulletin

N867 with information

on HSC

-1

Hollow

Shaft

Nutdriver

Sets.

name

address

city

state

& zone

L .J

CIRCLE NO. 37 ON READER SERVICE PAGE

96

nor wiring dress should be critical, but,

of

course, good wiring practice

should be fol-

lowed,

with all d.c. polarities observed

and

signal leads kept

short and direct. The re-

ceiver may be assembled breadboard fash-

ion

or,

if desired,

on any type of board or

chassis.

The receiver's

self- contained antenna,

ANTI,

consists of a telescoping "whip" type

three to four feet long,

but terminals are

provided

for external

antenna (ANT2) and

ground (GND)

connections. James writes

that external antennas

as long as 30 feet,

or more, may be used for

maximum sensi-

tivity.

After

assembly,

check out, and test,

two

minor

adjustments

may be needed for opti-

mum performance.

Tune to a local station,

adjusting RI and

R3

as

needed; then, with

R3 set in about mid -position,

adjust RI for

maximum gain with minimum distortion.

Next, try reversing L2's leads,

using the

con-

nection which provides

maximum sensi-

tivity and readjusting

RI as needed. If a

high -gain transistor is used for QI, the

cir-

cuit may oscillate

with some settings

of

RI and R3; this

is

normal for a regenera-

tive

circuit and does

not

indicate

trouble.

In use, RI generally is left fixed in its

pre- adjusted position,

while sensitivity

is

adjusted by

means of

regeneration control

R3. With some

transistors,

you may

have

to

use

a

resistor of 100,000

to 330,000

ohms

between the collector and base of Q2.

Manufacturer's Circuit. The versatile

"touch control" circuit shown

in

Fig.

3

may

be used in a variety of applications, depend-

ing on the needs, interests, and imagina-

tion

of

the

user.

Typically,

it

might be em-

ployed for special display

or

stage effects, in

magic tricks,

in

emergency lighting, or as

part

of a

safety alarm

or

signal system. It

is one

of a

number of related circuits de-

scribed in "Small Scale Integration in Low

+

BI

- I2v

TOUCH

TERMINALS

R3

I

MEG.

II

#

53

RI

470K

R4

47K B

LIGHT

COUPLING

GI

2N3393

02

R2

L14

IOOK

5yF

Fig. 3. Touch control circuit uses photo -Darlington

transistor, which, once triggered,

is held

on

by I1.

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ELECTRONICS

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