Radio Shack DC Power Supply, 22-504 Owner's Manual

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Please read before using this equipment.

Regulated 3-Amp

DC Power Supply

Cat. No. 22-504

OWNER’S MANUAL

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FEATURES

Your RadioShack Regulated 3-Amp DC Power Supply is designed
to power equipment that requires 12V DC automotive power. The
power supply converts standard 120V AC household power to

13.8V DC power and can supply up to 3 amps of continuous power.
Your vehicle’s electrical system provides 13.8 Volts when the

Note:

engine is running.
If you are an el ectronic hobbyist or technician, you wil l appreciate

the many uses for the power supply at your workbench or in your
house. For example, use your CB mobile transceiver as a base sta­tion, check the operation of autosound systems befo re you install
them in your vehicle, or even power marine equipment such as
pumps.

Your power supply’s features include:

Re

ulated Output Voltage

— makes it safe to use with mobile
CBs, Ham radios, C D players, tape players or anything y ou would
power with a vehicle’s DC electrical system.

Electronic Overload Pr otection

— automatically shuts off s tan­dard 120V AC input power to the power supply when its output is
overloaded.

Warning

do not expose this po wer sup ply to rain or
moistu re

2

: To prevent fire or shock hazard,

.

CAUTION

RISK OF ELECTRIC SHOCK.

DO NOT OPEN.

CAUTION

ELECTRIC SHOCK, DO NOT REMOVE
COVER OR BACK. NO USER-SERVICE­ABLE PARTS INSIDE. REFER SERVICING
TO QUALIFIED PERSONNEL.

: TO REDUCE THE RISK OF

© 1995 Tandy Corporation.

RadioS hack is a trade mark used by Tandy Corporation.

!

All Rights Reserved.

This sym bol is inten ded to
alert you to th e prese n ce of
uninsulated dangerous
voltage within the power
supply’s enclosure that
might be of sufficient mag­nitude to constitute a risk of
electric shock. Do not open
the power supply’s case.

This sym bol is inten ded to
inform you that important

!

operating and maintenance
instructions are included in
the literature accompany­ing this power su pply.

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Over Temperatur e Protection Circuit

— automatically s huts off
standard 120V AC inp ut power to the power supply w hen it over­heats.

Cigarette Lighter Socket

— lets you connect a device that requires

input power from a cigarette-lighter socket.

Binding P ost Term in als

— let you connect a device thet requires

input power from positive and negative wires.
This power supply has been tested and found to comply with all ap-

plicable UL standards.

Not recommended for outdoor use.

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IMPORTANT SAFETY INSTRUCTIONS

SAVE THESE INSTRUCTIONS!

DANGER

CAREFULLY FOLLOW THESE INSTRUCTIONS.

This manual contains important safety and operating instructions for this
power supply. Before you use the power supply, read all the instructions
and cautionary markings in this manual, on the power supply, and on the
product that yo u wil l connect to the power supply .

Warning

• Do not use the power supply near water (for example, a bathtub,

• Do not place the power supply on an unstable cart, stand or table. If

• Do not overload power outlets or extension cords. An overload can

• Do not use an extension cord unless absolutely necessary. Using an

• Do not disassemble the charger; take it to a qualified service techni-

• Do not use an attachment not recommended or sold by RadioShack

• Never push any object into the slot in the power supply. It could touch

: TO REDUCE THE RISK OF FIRE OR ELECTRIC SHOCK,

: To reduce the risk of injury:

washbowl, kitchen sink, laundry tub, wet basement, or swimming
pool).

the power supply falls, it could injure a person or cause serious dam­age to the powr supply.

result in fire or electric shock.

improper extension cord could result in a risk of fire and electric
shock. If an extension cord must be used, make sure:

a. The pins on the extension cord’s plug are of the same number,

size, and shape as tho se of the plug on the charger.

b. The extension cord is properly wired and in good electrical condi-

tion.

c. The extension cord’s wire size is at least 18 AWG.

cian when service or repair is required. Improper reassembly may
result in a risk of electric shock or fire.

or this could re sult in a risk of fire, el ectric shock, or injury to persons.

dangerous volta ge points or short out parts resul ting in a fire or elect ri­cal shock.

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Caution: To reduc e the risk of damage:

• Do not expose the power supply to rain or excessive moisture.

• Do not operate the power supply if it has been drop ped or damaged in
any way . Take it to a qualified service technician for repair.

• Slots and openings on the back and bottom of the power supply ’s cab­inet are for ventilation. To ensure the power supply’s reliable operation
and to protect it from overheating, be sure these openings are not
blocked or covered.

• The power supply should be operated only from a standard AC outlet
that provides 120V AC/60 Hz, as indicated on the label. If you are not
sure of the type of power supplied to your home, consult your local
power company.

• For added safety, the power supply’s polarized plug fits only into a
polarized outlet. If your AC outlet is not designed for the polarized
plug, have an electrician install the correct outlet , or use an adapter to
ground the power supply safely. Do not defeat the safety purpose of
the plug.

• To protect the power supply during a lightning storm or when it is left
unattended and unused for long periods of time, unplug i t f rom the AC
outlet. This will prevent damage to the power supply from lightning
and power surges.

• Do not operate the power supply with a damaged cord or plug —
replace them i mmediately. To reduce the ri sk of damage to the electri c
plug and cord:

a. Make sure the cord is not located where it will be stepped on,

tripped over, or otherwise subjected to damage or str ess.

b. Disconnect the power supply by pulling the cord’s plug rather than

the cord.

• Unplug the power supply from the outlet before attempting any main­tenance or cleaning. Do not use liquid or aerosol cleaners. Use a
damp cloth for clean ing and then wipe it dry immedia tel y.

• If your power supply does not operate normally, in particular if any
unusual sounds or smells come from it, immediately unplug it and
contact your loca l Radi oShack store.

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CONNECTIONS

Caution:

supply to standard AC power.

Make all other connections before you connect the power

CONNECTING A DEVICE REQUIRING
POSITIVE AND NEGATIVE WIRES

1. Turn off the device requiring power.

2. Set the power supply’s POWER switch to OFF (

3. Turn the sleeves of the red and black binding output posts
counterclockwise to expose the wire hole.

).

0

4. Insert the device’s positive wire (usually red) into the red bind­ing post’s wire hole, then tig hten the binding post’s sleeve to
secure the wire in place.

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5. Insert the device’s neg ative wire (usually black) into the black
binding post’s wire hole, then tighten the bin ding post’s sleeve
to secure the wire in place.

Warnings:

To avoi d dam age to both the po wer supply and the

device:

• Follow the correct polarity when connecting the power sup-

ply and the device.

• Do not let the ends of the positive and negative wires touch

each other.

Your local RadioShack store has a wide selection of

Note:

banana plugs and hook clips that are convenient for making
the connections to the binding posts.

6. Connect the power s upply’s AC cord to a standard 120V AC
outlet.

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CONNECTING A DEVICE REQUIRING A
CIGARETTE-LIGHTER SOCKET

1. Turn off the device requiring power.

0

2. Set the power supply’s POWER switch to OFF (

3. Open the cigarette lighter socket’s cap on the front of the
power supply.

Note:

Be sure to close the cigarette lighter socket’s cap when

you are not using the socket.

).

4. Connect the device’s vehicle DC power cord to t he powe r su p­ply’s cigarette lighter socket.

5. Connect the power supply’s AC cord to a standard 120V AC
outlet.

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OPERATION

To use the power supply after you connect the device to it, set

to l to turn it on.

ER

Caution:

• Check all connections and confirm the wall outlet has power.

• If the outlet has power, check to see if the circuit breaker on the

If your device stops operating, check the circuit breaker. If it has
tripped, check and correct for a short or overload condition, wait for
the device to cool, then press in the reset button on the back of the
power supply.

If the power supply’s

back of the power supply has tripped.

POWER

switch does not light:

POW-

(il-

Your power supply’s temperature protection circuit automatically
shuts down the power supply when it is overheated. If this happens,
turn off the power supply, then wait until the power supply cools be­fore you turn on power again.

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SPECIFICATIONS

Input Voltage...........................................................110 to 120V AC

Input Frequency......................................................................60 Hz

Output Voltage................................................13.8V DC±±0.5 Volts

Output Current .........................3 Amps DC Continuous (Maximum)

Line Regulation.......................................................Less Than ±5%

Load Regulation...................................................... Less Than ±5%

Overload Protection................................Circuit Breaker 2.5A/> 50V

Output Ripple..............................................................100 mV RMS

Design....... .................................................................... Linear Type

Operating Temperature..................................................32 to 104°F

(0 to 40°C)

Storage Temperat ure ...................................................–13 to 158°F

(–25 to 70°C)

Input Cable...................18 AWG x 2C W/1-15P Plug, SPT-2 6 Feet

Output Terminal....... ........................Binding Po st 1 0 Amp/ 1 25 Volts

Power Switch..........................................Illuminated, 15A /1 2 5 VAC

1

Dimension s......................... ..............3

Weight.................................................................5.18 lbs (2.35 kgs)

/4 x 47/8 x 81/4 Inches (HWD)

(82 x 124 x 210 mm)

Specifications are typical; individual units might vary. Specifications
are subject to change and improvement without notice.

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NOTES

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RadioShack Limited Warranty

This product is warranted against defects for 90 days from date of purchase
from R adioSha ck comp any-own ed stor es and authori zed Radi oShack franchi­sees and dealers. Within this period, we will repair it without charge for parts and
labor. Sim ply
any RadioShac k store. War ranty does not cover transportation costs. Nor does it
cover a product subjected to misuse or accidental damage.
EXCEPT AS PROVIDED HEREIN, RADIOSHACK MAKES NO EXPRESS
WARRANTIES AND ANY IMPLIED WARRANTIES ARE LIMITED IN DURA­TION TO THE DURATION OF THE WRITTEN LIMITED WARRANTIES CON­TAINED HEREIN. Som e states do not perm it limitation or exclusion of imp lied
warranties; therefo re, the af oresaid limitation(s) or exclusion(s) may not apply to
the purch as er.

This warranty gives y ou spec ific le gal ri ghts and yo u may also hav e othe r rights whi ch vary
from state to state.

bring your R adioShack sales slip

We Service What We Sell

as proof of purchase date to

10/95

1 1A5 Printed in China

RadioShack

A Division of Tandy Corporation

Fort Worth, Texas 76102