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1、_.,_._. ,.-I_ THE POWER AMPLIFIER for ASSEMBLY and OPERATION CAUTION: IF THE FUSES BLOW, SOME DISTORTED SOUND CAN BE HEARD. THEREFORE IF AMPLIFIER MALFUNCTIONS, ALWAYS CHECK FOR BLOWN FUSES FIRST. LM153 $3.00 THE DAVID HAFLER COMPANY 5910 Crescent Boulevard, Pennsauken, New Jersey 08109 Please refer
2、 to this serial number in all communications regarding this equipment. RadioFans.CN DH-500 Power Rating: Less than 0.025% total harmonic distortion at any power level up to 255 watts continuous average power per channel into 8 ohms at any frequency between 20 Hz and 20 kHz with both channels driven.
3、 IM Distortion (SMPTE): Less than 0.007% from 1 watt to 255 watts into 8 ohms Typical THD at 255 watts into 8 ohms: 1 kHz-0.002%; 10 kHz-0.007% Frequency Response into 8 ohms: -3 dB, 0.5 Hz to 120 kHz at 1 watt kO.5 dB, 5 Hz to 40 kHz at 255 watts Typical Channel Separation at 1 kHz: 60 dB Signal to
4、 Noise Ratio: Exceeds 100 dB referred to 255 watts into 8 ohms, unweighted Exceeds 90 dB referred to 1 watt into 8 ohms, A weighting Input Impedance: 47,000 ohms Input Sensitivity: 2.35 volts for 255 watts into 8 ohms; 0.145 volts for 1 watt Damping Factor: 200 to 1 kHz into 8 ohms; 60 to 10 kHz int
5、o 8 ohms Rise Time: 10 kHz, 80 volts p/p square wave, 10% to 90%: 2.5 us. Slew Rate: 1 kHz, 120 volts p/p square wave: 45 V/us. Semiconductor Complement: 27 transistors, 12 power Mosfets, 33 diodes, 8 zener diodes, one integrated circuit, one diode bridge. Power Consumption: 240 VA quiescent; 1200 V
6、A rated power into 8 ohms, 2 channels Size: 7-l/4” high, 19” wide, 13” deep including handles Net Weight: 45 lbs. Shipping Weight: 49 lbs. CAUTION: For continued protection, replace the power fuse only with the same type and rating as indicated. WARNING: TO PREVENT FIRE OR SHOCK HAZARD, DO NOT EXPOS
7、E THIS EQUIPMENT TO RAIN OR MOISTURE. 0 Copyright 1987. All rights reserved. RadioFans.CN INTRODUCTION The Hafler DH-500 is a two channel audio power amplifier designed to the very highest performance stan- dards. It is available as a kit, or factory assembled. Its power rating of 255 watts per chan
8、nel is very conservative, and it can deliver appreciably higher powers into impe- dances below the rated 8 ohms. You must be very cautious in the application of this amplifier, as its output capability is more than most speakers can safely tolerate. We urge you to read the “Operation” section of thi
9、s manual so your speakers will be reasonably protected. The best protection is still common sense in choosing program levels which your speakers can tolerate. The DH-500 combines power MOSFET technology with a uniquely simple and effective circuit which reduces all types of distortion at all power o
10、utputs, over the entire audio spectrum, to levels where the finest test equipment has great difficulty in measuring it. The DH-500 sets a new high in reliability and resistance to abusive operating con- ditions at such high powers. This is one of the direct ben- efits of the power MOSFET s ability t
11、o current limit under abnormal conditions. Where the conventional bipolar transistor must be pro- tected by special circuits from entering “thermal runa- way” when it gets hot due to heavy signals, tending to get even hotter, the MOSFET self-corrects to reduce the cur- rent, and thus the heat under
12、the same conditions. You thus gain the dual advantages of simpler circuitry and the elimination of one of the chief causes for distorted signals imposed on the music-the sound of the actuation of com- plex protective circuits. The speed-measured as the slew rate-of the DH-500 delivers unmatched tran
13、sient linearity, revealing the most delicate nuances of the music. In refining the basic Hafler MOSFET circuit the overall open loop gain was reduced by using more local feedback in the input stage. This re- quired less compensation to stabilize the circuit, with the result that it was faster overal
14、l. With the built in bandwidth limitation at the input, all other stages are free of any trans- ient overload. The fully complementary, symmetrical push-pull circuit is direct coupled throughout (except at the input). It uses all silicon discrete devices in a format which is directly re- lated to th
15、e acclaimed Hafler preamplifier circuit. With its unconditional stability into virtually any load, and its enormous power capability, the result is complete freedom from listening fatigue. The longer you listen to this re- markable amplifier, the more certain you will be that you could not have made
16、 a better choice. While modest in cost, through the elimination of frills and gadgetry, the quality is evident not only in the sound, but in the conservatively rated components. The over- sized power transformer, the conservative operating levels of the MOSFETs, the computer-grade electrolytics tota
17、l- ling 40,000 microfarads, the enclosed relay, the use of film capacitors in signal circuits-all are evidence of the design efforts to achieve exceptional reliability simultaneously with state of the art sonics and specifications. So rugged is the DH-500 that it can deliver over 20 amperes into a s
18、hort circuit! For those with special power needs, the DH-500 can be adapted to monophonic operation, delivering in excess of 800 watts into 8 ohms, by installing the DH-502 input bridging kit. Those who have chosen to build this amplifier from the kit will find the assembly instructions assume no te
19、chnical ability other than how to make a good solder connection. Even that has been described for those who are new to the fun of kit building. Through pre-assembly and testing of the complete signal module, the performance of the kit has already been assured, for assembly involves little more than
20、interconnection of the power supply and control ele- ments. You can look forward to just a few hours of con- struction fun, to hear the finest audio amplifier yet pro- duced. CONTENTS installation.Page 4 Operation.4 Connections.5 Assembly Instructions.6 If Problems Arise .I4 Circuit Description.I5 S
21、chematic Diagram.16 Component Values.17 AC Line Connections for Overseas Use .I8 Kit Parts List.I9 Service and Warranty.20 Pictorial Diagram.Insert 3 RadioFans.CN INSTALLATION The DH-500 may be installed out of sight in many appli- cations, where its power can be controlled by the AC switching of a
22、preamplifier control unit. However, any high power amplifier may draw enormous amounts of cur- rent, so you should make sure your preamplifier has the switching capacity for the amplifier s needs, as well as any other equipment which it also switches. inadequate switch current capacity may eventuall
23、y render the switch in- operative The power switches in Hafler preamplifiers have been chosen for their high ratings, and have been tested and deemed suitable for normal home switching of the DH- 500. However, if the amplifier is intended for operation at sustained high power levels, or where power
24、switching is very frequent, or where the control unit must switch sub- stantial additional current for other equipment, or if your control unit does not have the 15 ampere switching capac- ity, you should use the power switch on the DH-500, and connect it directly to the AC line. In such use, turn t
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