Massive Audio DB8000 Manuel d'utilisateur télécharger pdf (Page 54)

I(C)COLLECTOR

(B)BASE

(E)EMITTER

GND

MPS370B MFE2094

SOURCE(S)

DRAIN(DI

GATE(G)

Fig.

4. These outline drawings show the terminal

identification

of the

transistors

used in the cir-

cuit. Ground

terminal of the

MFE2094

must be cut.

stalling the

diodes

and electrolytic ca-

pacitors.

If you prefer

to

make your

own circuit

board, you can still follow the

parts lay-

out shown, using the

schematic

(Fig. 1)

as

a

wiring

diagram.

Installation.

Since

the Audio Leveler

goes between

the microphone

(remem-

ber, it can

be used only

with a low

-im-

MIC.

CB

TRANSMITTER

MIC.

INPUT

Fig.

5.

Terminal A goes to the microphone and

terminal B connects

to the

MIC input

on the trans-

mitter. The unit

is grounded to the transmitter.

pedance mike) and your transmitter's

MIC input

(see

Fig. 5 )

,

it can easily

be

installed in

any

rig.

If

there's

room inside

the unit, mount

the circuit board in any convenient spot,

supporting

it

on standoff spacers.

The

photo

on page

100

shows the

Audio

Leveler installed inside a Heathkit GW-

TRANSMITTER

ANTENNA

CONNECTOR

8+

1200

TO 300V)

22K

4

(2V,IW

ZENER

DIODE

+12V TO

AUDIO

LEVELER

Fig. 6.

This

simple

voltage

divider can be

used in a

tube -type transceiver to obtain a 9 -12 volt

regu-

lated output for operating the Audio Leveler.

14

transceiver. If lack

of

room

does not

permit this

type

of installation,

the unit

can be mounted

in

a small metal case

and installed outside

of the transmitter

or

VFO

enclosure. Connection is between

points A and

B

on the

circuit

board.

To

use the

Audio Leveler

with a tran-

sistorized

CB

radio, connect

a

lead

from

the

+12 -volt

power source to the +12-

volt

terminal

on the circuit

board, and

another lead from the

common

terminal

on the circuit board (negative

side of

C3) to

the

transmitter ground.

If

the Audio

Leveler

is

to be used

with

a tube -type transceiver, a 9 -volt battery

can serve as the voltage

source. How-

ever, if you

would

rather

operate

the

Audio Leveler from your

transceiver's

power supply, a

circuit

similar

to that

of Fig.

6

will

provide

the 12 -volt

d.c.

power. But

be sure to connect

the re-

sistor to the cathode of

the rectifier

rather than to the

load

side

of the power

supply to avoid overloading

the set's

filter

system.

(Continued on page

100)

-

OSCILLOSCOPE

L

Fig.

7. The Audio

Lev-

eler can be

tested

and

adjusted

with an

oscilloscope connect-

ed

to the transmitter

output

through

the

network

shown here.

The gain

is adjusted

while

observing the

transmitter output.

58

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