McIntosh MC152 Manuel du propriétaire télécharger pdf (Page 17)

Technical Description, con’t

Figure 24

Block Diagram

of the

Power Supply

INRUSH

CURRENT

LIMITER

AC Power

MAIN RELAYS

BACKUP

POWER SUPPLY

CONTROL

LOGIC

LIGHTING

CONTROL

POWER

CONTROL

Power Supply Circuits

To compliment the design of the MC152 Power Am-

plifier Circuitry, there is a high current high voltage

power supply. Refer to figures 24 and 26. The very

large Power Transfomer can supply over 6 amps of

current. Refer to figure 25 (golf ball is for size com-

parsion). It is enclosed in the legendary McIntosh Pot-

ted Enclosures and weighs 18 lbs.

There are two super size main filter capacitors sup-

pling all of the energy which is necessary for the wide

dynamic range that “Digital Audio” demands. Refer to

figure 26.

The power amplifier draws high current from the AC

power line. Therefore, it is important that they plug

directly into the wall outlet.

Also, most owners desire one power switch for the

whole audio system. The MC152 is equipped with a

circuit that provides remote Power Control from a Mc-

Intosh A/V Control Center. Refer to figure 14 on page

14. When the A/V Control Center is switched On, a

(5-12V) signal operates the power relay in the MC152.

The MC152 also has a Power Control Out Jack. The

Power Control signal from the jack is delayed by a

fraction of a second so that the turn on power surge

of the next power amplifier occurs at a later time.

This helps prevent power circuit overload that could

trip circuit breakers or blow fuses, a very important

feature in a high power Home Systems employing

multiple MC152 Power Amplifiers.

Figure 26

Figure 25

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McIntosh MC152 Manuel du propriétaire Page 17

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