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Hafler DH-110 - page 1
THE PREAMPLIFIER DH-110 INSTRUCTIONS for ASSEMBLY and OPERATION LM132 $3.00 Please refer to this serial number in all communications regarding this equipment. THE DAVID HAFLER COMPANY 5910 Crescent Boulevard, Pennsauken, New Jersey 08109 DH-110 ...
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Hafler DH-110 - page 2
SPECIFICATIONS The numbers in parentheses refer to the paragraph in the IHF specifications manual which defines the test procedure. 2 PHONO PREAMP SECTION Rated Output: 3 Wms, 8 Hz-105 kHz Maximum Output (3.5): 12 Vrms, 20 Hz-20 kHz at recording output Total Harmonic Distortion: Less than 0.0006% @ 1 kHz, 3 Vrms Frequency Response (3.13): +0, -0.25 ...
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Hafler DH-110 - page 3
INTRODUCTION Your preamplifier is the control center of your music system, acting as an interface between the sound sources-record players, tape recorders, FM and Video tuners-and the power amplifier which drives the loudspeakers. As the focal point of your system, it should be attractive and easy to use, versatile and yet functionally unobtrusive. ...
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Hafler DH-110 - page 4
The DH-110 is provided with accessory Rack Mount end caps in addition to the standard end caps installed on the unit. These accessory caps extend the width of the front panel to that of a standard 19” rack, with appropriate mounting holes. Installation instructions are detailed later in this manual under Additional Information. POWER CONNECTIONS ...
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Hafler DH-110 - page 5
fects that can result from unpowered electronic circuits in the tape decks when they are connected to the Recording Outputs, it is recommended that tape recorders be switched on when the preamplifier is in use. This is a commonly overlooked cause of less-than-ideal preamplifier performance. Signals at these outputs are at line input level (phono si ...
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Hafler DH-110 - page 6
The following controls affect all signals which are heard through speakers or headphones. They have no effect on the signals to the recording outputs. MONO SWITCH When this button is IN, left and right channel informa- tion is combined, and the composite signal is fed to both left and right outputs. In this mode the sound image should appear to be ...
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Hafler DH-110 - page 7
There are three basic rules for success in electronic kit building: 1: Read the instructions carefully, and follow them in or- der. 2. Make secure solder connections which are bright and smooth. 3. Check your work carefully after each step. The DH-110 preamplifier is a versatile component with sophisticated circuitry which has been made remarkably ...
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Hafler DH-110 - page 8
Excess solder may be removed from a connection by heat- ing it and allowing the solder to flow onto the iron, which is then wiped on the sponge. ALL SOLDER USED MUST BE ROSIN CORE Never use acid core solder or any separate flux in elec- tronic work. Silver solder is also not suitable. If in doubt about unmarked solder, always obtain a fresh supply ...
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Hafler DH-110 - page 9
BUILDING THE KIT Partial mechanical assembly of the kit provides protec- tion for major components during shipment. Most of the hardware thus used is included in the quantities listed in the parts list. The exception is that used to install the rear mounting bracket on the PC-14, as this is considered an in- tegral assembly. Only the two screws sec ...
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Hafler DH-110 - page 10
each socket, the board is marked to indicate the side of the hole on which the center mounting tab should be positioned, so that it will be soldered to the widest part of the circuitry on the back side. Leave the phono plug in the socket while bending and soldering is completed. If you do not bend the center tab quite flat against the board, it is ...
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Hafler DH-110 - page 11
23 [7 Select the 6 black 5/8" screws, the 6 spacers, and 6 small nuts. Insert the screws from the outside of the back panel at the locations nearer the center of the panel (not in the end holes marked “Grounds”). Install a spacer on each screw and tighten them. Place the PC-12 assembly in position so that its two screws pass through the en ...
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Hafler DH-110 - page 12
@ 0 RIGHT nn IGHT PHONO LEFT PHON’ i 1.6 , IN 02 13 03 15-1 15T1 I’ 1 I I! ot60” 04 SELECTOR MONITOR TONE r- I I _EPL I 1 1 PHONO M SlA R t+ K s3 FLAT ROUND D13 D14 ...
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Hafler DH-110 - page 13
HT LINE- aa n “;T No 0109 E 0 - LEFT LINE - -r 0107 (J Q-&xo T c21 - 012 @oE Cl9 I 1 I 1 - Ql- -R44- izJ 141- --R144- 011 0 -D5k 0 Fl v I E 1 co “0 “0 527 (0 Do EO -Ml- +D6- -D7k 0 c34 0 C36 0 C32 v --R66- --R56- llll h -R65- 8 6 g 3 Ic38) -R62- K(TUK 8 III1 I --R57- ‘0 “6 --R45- ,- iD12- VOLUME --R59- -R64- L R R26 ...
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Hafler DH-110 - page 14
wire to hole Q, which is between the center lugs of Jll and 512. (S). The wire should not protrude sig- nificantly beyond the front surface of the board to avoid coming in contact with a connector. To assure a good solder connection, bare wire should be visi- ble on the circuit side of the board. Connect the green wire to hole P in like manner. (S) ...
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Hafler DH-110 - page 15
IF A PROBLEM ARISES If neither LED lights when you first turn on the power switch, turn the unit off immediately. Check the fuse. Check the polarity of the LEDs. Check the power transformer wiring for proper connections for your line voltage. Look for a short caused by a stray strand of wire, or for a solder splash on the circuit board. A print of ...
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Hafler DH-110 - page 16
ADDITIONAL INFORMATION RACK MOUNT END CAP INSTALLATION Every DH-110 is supplied with front panel accessory end caps which adapt it to a standard 19” rack panel, and with a 5/32” Allen wrench which fits the mounting screws. Remove all power and signal connections from the DH- 110. On a protected surface such as a towel, remove the two cover scre ...
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Hafler DH-110 - page 17
MINIMIZING NOISE IN THE SYSTEM Your choice of separate components is the right way to secure the best performance from a music system, but the wide-band characteristics and complexity of the best sys- tems may also not conceal the introduction of ground loops and noise pickup-especially RFI (radio frequency interference). With exceedingly high qual ...
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Hafler DH-110 - page 18
Tape 2 law 1 CD/Video Phono 1 Phono 2 Tuner Record Out EPL Send EPL Roturn PHONO 1 C 2 B C R TONE FILTER EPL Treble Bass SAL VOL v v, 0 0 1 LINE OUTPUTI To Right Channel r-K Switched E Direct FUNCTIONAL BLOCK DIAGRAM 18 ...
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Hafler DH-110 - page 19
COMPONENT VALUES All resistors are 1/4 watt I% Metal Film unless otherwise noted. Rii channel corresponding values have designations above 100. RI R2 R3 R4 R.5 R6 R7 R8 R9 RIO RI1 RI2 RI3 RI4 Rl5 R16 RI7 RI8 RI9 R20 R2l R22 R23 R24 R25 R26 R27 E R30 R3l R32 R33 R34 R35 R36 R37 R38 R39 R40 R41 R42 R43 R44 R45 R46 R47 R48 R49 R50 R5l R52 R53 R54 R55 ...
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Hafler DH-110 - page 20
PC12a CABLE PIN NUMBERS TUNER @j----o N ISELECTOR] ” TAPE 1 EPL SEND (0)“’ I ,T I I I e m-c ‘I I JlO I DIRECT OUTPUT OUTPUT VIA PHONE JACK PHONO 1 PHONO 2 GROUND pos1.s PHONE JACK R24 6 Twisted Wlms L I 1 L 7 l0g000 QQJ 527 R ,a rbd 1 I3 L I4 I pm*” I - 0 8 _ 7 513 b 6 ‘R 1 black SWITCH PINS SEEN FROM BOTTOM OF CIRCUIT CARD NOTE: Tranaf ...
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Hafler DH-110 - page 21
PC13 lYONOl IB*LINCE] l75y7q C29 C30 LINE AMPLIFIER Fcml R49 520 SYMBOLS I3 POWER SUPPLY GROUND m SHIELD GROUND m LEFT , 6 > CHANNEL SIGNAL GROUND m RIGHT 1 o+ 1 o- ; POWER SUPPLY RAILS Q CIRCUIT CARD LAND CHASSIS GROUND -a MALE CONNECTOR PIN -c FEMALE CONNECTOR SLEEVE - SWlTClj CLOCKWISE, DEPRESSED I5 L MUTING + I I .a R R J J DH 110 PREAMPLIFI ...
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Hafler DH-110 - page 22
KIT PARTS LIST Minor variations may sometimes be encountered in value or appearance. These will not affect performance. Some items may have been used to package the kit for shipment. I 1 I 1 1 2 1 1 1 1 2 1 2 2 4 10 6 4 3 2 2 6 6 2 6 4 12 8 2 3 4 1 4 I 1 1 6 24 1 1 3 1 f 4 : 1 I 1 22 Cover, black Bottom plate Front Panel extrusion, black Front subp ...
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Hafler DH-110 - page 23
SERVICE POLICY AND LIMITED WARRANTY Your DH-110 Preamplifier has been carefully engineered to provide many years of use without maintenance or ser- vice. Factory assembled units undergo many physical and electrical tests before shipment. The circuit board in kits is similarly tested to meet all primary specifications before it is packed. Neverthele ...
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Hafler DH-110 - page 24
Printed in USA ...
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