Epson L90P - TM Two-color Thermal Line Printer Manual de usuario descargar pdf (Pagina 27)

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Fig. 3. The KD2115 is com-

plete

audio amplifier

TO -5 can.

When

driven from

low -level signal,

this

can put about 1/2 watt to

speaker. Because

its

low power

requirements,

and small size,

it makes

good general -utility bench

amplifier, as well as a

handy

amplifier

for

out-

door (battery)

operation.

amplifier

circuit shown

in Fig. 4 should

interest most experimenters.

This audio

amplifier

can be used with

a portable

system, as a phonograph

amplifier,

or in

any application

that

requires a

low

-pow-

er,

portable, lightweight

audio

amplifier.

With

a supply

voltage as

low

3 volts,

the circuit will

deliver

milliwatts to a

3.2 -ohm speaker, with

idling current

of about

7 mA.

With

9 -volt

supply, the

circuit delivers

about

' watt with

idle

current of

22 mA.

The

temperature -

tracking

voltage

regulator

the

permits it to be used

over a very wide

range of temperatures,

making

the

KD2115

ideal for outdoor applications.

With

a supply

voltage of

6 volts

more,

heat sink (Wakefield

NF209 or

similar)

for the

is recommended.

This insures maximum

power

output.

Fig. 4. Add just

few

outboard

components to the

KD2115,

and

you

have

an excellent audio

am-

plifier that can be

very

useful

to the electronics experimenter.

470K

4.7K

SI\

01 -

3.211

7SPKR

April,

1969 29

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