Get PDf version of the CT101 instruction manual
Contents
1. Using CT101 without volume x control Jumper connecting 2 with 3 LAQUUOO CIPNY USIUEC 6661 JK LOLLI Joyng oIpny Resistors one per channel may be connected either across the input terminals or between the volume control points 1 and 2 7 Jumper Sw connecting 2 with 3 Fig 8 Using CT101 without volume control but with resistors controlling the input resistance CT101 offers gain settings of 0dB 6dB or 12dB OdB gain setting is referred to as buffer mode The gain is set individually for the two channels but usually the gain is set at the same level Gain setting is made without soldering or using any tools The gain setting jumpers may be removed or repositioned by hand Just remove it by pulling it away from the PCB See fig 9 for guidance It is recommended to choose the lowest usable gain setting as the CT101 specifications at lower gain are slightly better than at the higher gain settings Danish Audio ConnecT does not authorize or warrant the use of any of it s products in life support devices and or systems Danish Audio ConnecT shall not be liable for any damages to connected equipment like amplifiers and loudspeakers Copyright 2001 Danish Audio ConnecT A S Denmark All rights reserved Revised 28 August 2002 oa n AC O Instruction Manual DanisH Aupio ConnecT CT101 2 channel2. 200uF each The reservoir capacitors should be mounted on the supply lines as close to CT101 as possible so only short wires are required A simplified schematic is shown in fig 5 Examples of suited reservoir capacitors are RS Components part no 394 923 Farnell part no 108 844 Fig 4 Power supply cables included with CT101 Danish Audio ConnecT does not authorize or warrant the use of any of it s products in life support devices and or systems Danish Audio ConnecT shall not be liable for any damages to connected equipment like amplifiers and loudspeakers Copyright 2001 Danish Audio ConnecT A S Denmark All rights reserved Revised 28 August 2002 RAT Instruction Manual DanisH Aupio ConnecT CT101 2 channel line stage linear preamplifier module supply voltage e 0 supply voltage e Supply voltage Fig 5 Connecting low impedance power supply reservoir capacitors to CT101 Dual mono dual power suppl For optimal performance especially benefiting channel separation we ic recommend using a separate power 4 supply for each CT101 channel dual Col mono Both power supplies should be identical and meet the above mentioned requirements When purchasing a CT101 the package includes 3 pcs jumpers In case a power supply is used for each channel the three jumpers are not used In case one power supply is used common for both channels the three jumpers must be mount
3. electronics equipment Magnetic materials are associated with hysteresis losses when exposed to varying electrical magnetic fields Plastics are associated with dielectric losses when exposed to varying electrical fields although some plastics do have very low losses Both phenomena introduce non linear distortion which disturbs low distortion high end audio equipment Some times plastic enclosures are preferred because of their electrical non conducting properties In that case we recommend using a plastic type with low dielectric loss like for instance Teflon polystyrene and polypropylene Otherwise we recommend using an enclosure made of a non magnetic metal Easily and cheaply available are enclosures made of aluminium but also copper and brass are suited materials Metal enclosures are usually grounded and they reduce electrical fields radiated into the audio electronics thereby reducing audible noise Mounting CT101 in a metal enclosure A very typical way to mount CT101 is in a separate metal enclosure As an example see fig 10 For non balanced audio equipment it is very common to use RCA sockets for audio signal input output To avoid hum make sure that the body signal GND of the RCA sockets do not make electrical contact with the metal enclosure Instead as shown make a GND connection from one of the audio input signal grounds to the chassis Danish Audio ConnecT does not authorize or warrant the use of any of it s products in li
4. line stage linear preamplifier module LOLLO J jjng olpny ENE NS Fig 9 CT101 gain setting setting 6dB gain setting 12dB gain setting MOUNTING ASSEMBLING Mounting hardware To protect CT101 against dust and larger particles it should always be built into an enclosure When unpacking CT101 it is mounted in a plastic cover that protects it during shipping Loosen the two nuts and extract CT101 from the plastic cover In most cases the screws nuts washers and spacers can be used again for mounting CT101 in its final enclosure We recommend using the supplied mounting hardware as all the parts are made of audio grade materials The mounting hardware supplied by DACT contains neither magnetic materials nor plastics The easiest way to mount CT101 is by using the two holes in the PCB When mounting CT101 make sure to keep the PCB traces and solder joints on the back side at a safe distance from electrically conducting materials in order to avoid short circuiting Building CT101 into existing equipment One possibility is to build CT101 into the enclosure of existing audio equipment like preamplifiers CD players etc This is often possible because CT101 requires only little space and could possibly be supplied from the existing power supply in the host equipment Before experimenting with ready made audio
5. products in life support devices and or systems Danish Audio ConnecT shall not be liable for any damages to connected equipment like amplifiers and loudspeakers Copyright 2001 Danish Audio ConnecT A S Denmark All rights reserved Revised 28 August 2002 Mr ATI
6. we recommend reading the application note on using CT101 to build a multi channel active preamplifier 6 channel A V audio CT101 may be used for 6 channel A V audio signals Then three CT101s have to be used for instance one for the front channels one for the rear channels and on for the center and the sub channels As volume control we recommend using a 6 deck DACT stepped attenuator If the three CT101s are mounted behind each other the 6 deck attenuator will fit directly into all three PCBs For more information we recommend reading the application note on using CT101 to build a multi channel active preamplifier DC offset All DC coupled equipment always has a small DC offset at the output CT101 typically has a DC offset around 1mV at 0dB gain setting This level is usually not a problem If a DC coupled amplifier follows CT101 it must be evaluated if the DC offset level at all points in the chain of audio equipment is at acceptable levels Especially the DC level across the loudspeaker terminals is critical To remove the DC offsets audio grade coupling capacitors may be added Hints Power on of must be switched with a double pole switch to ensure that both the positive and the negative supply voltage are switched simultaneously DC coupled power amplifiers represent a potential risk for loudspeakers Be careful to check DC levels before connecting the speakers Do not flex the CT101 PCB This may damage the SMD components b
7. yng opny Fig 6 CT101 jumpers for using one or two power supplies Danish Audio ConnecT does not authorize or warrant the use of any of it s products in life support devices and or systems Danish Audio ConnecT shall not be liable for any damages to connected equipment like amplifiers and loudspeakers Copyright 2001 Danish Audio ConnecT A S Denmark All rights reserved Revised 28 August 2002 ASICS O Instruction Manual DanisH Aupio ConnecT CT101 2 channel line stage linear preamplifier module Instead of mounting the volume control apart from CT101 a better solution is to fit both together inside the enclosure and extend the volume control s shaft DACT offers shaft extension kits for attenuator shaft extension purposes Make sure always to attach the volume control to the equipment enclosure to a bracket or similar The volume control SHOULD NOT be fastened only by soldering it to the CT101 PCB Volume controls are available with many different resistances DACT offers stepped attenuators in 10 20 50 100 250 and 500kOhm It is our experience that the lower resistance volume controls sound better than high resistance volume controls when used with CT101 Therefore we normally recommend using a 10kOhm attenuator with CT101 There is one more concem when deciding which attenuator resistance to use for CT101 The attenuator is connected directly across the audio signal input Th
8. DanisH Aupio ConnecT CT Instruction Manual CT101 line stage linear preamplifier module Instruction Manual DanisH Aupio ConnecT CT101 2 channel line stage linear preamplifier module CONTENT Unpacking Connections Definitions Power supply Signal input Please make sure to read through Signal output Volume control all of this Instruction Manual before Gain setting connecting your CT101 Power supply Volume control Gain setting Mounting assembling Other information Headphones Balanced preamplifier 6 channel A V audio DC offset Hints Do not bend the CT101 PCB Caution Bending it may easily damage the SMD components on the rear side UNPACKING Thank you for purchasing this Danish Audio ConnecT product CT101 is a ready made 2 channel linear audio preamplifier module built on a compact PCB CT101 is specifically designed for using with a DACT stepped audio attenuator as volume control Connecting CT101 to input output sockets and an external power supply will provide you with a high quality no nonsense active preamplifier Side view Your CT101 purchase includes 1 pc CT101 2 channel linear preamplifier module 1 mounting set consisting of 2 pes M3 stainless steel screws 2 pcs M3 stainless steel nuts 2 pcs M3 brass spacers 4 pcs stainless steel washers 2 pcs power supply connectors including wires 3 pcs jumpers for using CT101 with one power supply 1 pc instruction manu
9. al We recommend that you make sure to keep all of the above items after unpacking your CT101 as everything will prove useful to you when mounting and connecting your CT101 CONNECTIONS Definitions Marking refers to the text printed on the CT101 Printed Circuit Board Marking Definition IN 1 Signal input channel 1 IN 2 Signal input channel 2 OUT 1 Signal output channel 1 OUT 2 Signal output channel 2 P1 123 Attenuator channel 1 P2 123 Attenuator channel 2 Power supply to one or both of the 3 way connectors Please also refer to Fig 1 Danish Audio ConnecT does not authorize or warrant the use of any of it s products in life support devices and or systems Danish Audio ConnecT shall not be liable for any damages to connected equipment like amplifiers and loudspeakers Copyright 2001 Danish Audio ConnecT A S Denmark All rights reserved http Mwww DACT com Revised 28 August 2002 Instruction Manual DanisH Aupio ConnecT CT101 2 channel line stage linear preamplifier module 2 x power supply connectors Dual or single power supply programming PCB holes for connecting the volume control settings SIGNAL Signal GND SIGNAL Signal GND 2 x signal input 2 x signal output connectors connectors Fig 1 CT101 connections Power supply CT101 is designed for using with either one power supply common for both channels or with a power supply for each channel The two chann
10. ase refer to the VOLUME CONTROL chapter on the following pages Gain setting The gain of CT101 can easily be set at either 0dB buffer mode 6dB or 12dB Please see fig 1 For more details please refer to the GAIN SETTING chapter on the following pages Flat tab connector Inner cable conductor Outer cable conductor screen Outer cable insulation Round pin terminal Insulation between cable inner and outer conductors CT101 PCB Two solder joints Fig 3 CT101 audio signal input output connections Danish Audio ConnecT does not authorize or warrant the use of any of it s products in life support devices and or systems Danish Audio ConnecT shall not be liable for any damages to connected equipment like amplifiers and loudspeakers Copyright 2001 Danish Audio ConnecT A S Denmark All rights reserved http Mwww DACT com Revised 28 August 2002 Instruction Manual DanisH Aupio ConnecT CT101 2 channel line stage linear preamplifier module POWER SUPPLY Requirements CT101 is delivered without power supply in order to let the user decide for and experiment with his own power supply design For information about available power supplies from DACT please visit http www DACT com CT101 requires a DC power supply to operate Maximum supply voltages and recommended supply voltage are specified in Table 1 of the CT101 Datasheet For typical applications where CT101 is used to drive loads of 5kOhm or greater
11. ed on the front side and soldered in both ends to the backside of the CT101 PCB See fig 6 If a common power supply is used it may be connected to the 3 way connector of either channel 1 or channel 2 WARNING If the CT101 is power supplied incorrectly with only a positive or only a negative supply half connected a DC voltage of several Volts may occur on the output Using one power supply Using one common power terminals OUT 1 and OUT 2 See also the for each channel The supply for both channels CAUTION chapter on the last page of this jumpers are not mounted The jumpers are mounted manual VOLUME CONTROL Principally CT101 can be used with any volume control However we recommend using only high grade volume controls Only the best volume controls will not influence the sound quality of CT101 Especially we recommend using a DACT stepped audio attenuator with CT101 The CT101 PCB layout makes it possible to fit either a DACT CT1 stereo or a DACT CT2 stereo attenuator just by soldering 6 connections on the backside of the PCB The best way is to solder the volume control directly into the CT101 PCB obtaining the shortest possible signal path and the best sound If this is not possible DACT offers a connection kit that does not require soldering on the attenuator The connection kit includes 3 x 30cm 3 x 12 wires For longer distances using shielded wires is recommended LOLLO ld ee 1
12. els of CT101 are completely separated on the PC Board Therefore when a power supply for each channel is used the operation is true dual mono The power supplies must be connected to the 3 way square pin headers as shown in fig 1 and fig 2 exact connector dimensions specified in fig 3 of the CT101 Datasheet The colour codes RED BLACK BLUE in fig 2 refer to the colours of the wires attached to the two separate power supply connectors which are included when purchasing a CT101 For more details please refer to the POWER SUPPLY chapter on the following pages Signal input The input terminals are marked IN 1 and IN 2 on the CT101 PCB and consists each of a round pin terminal and a flat tab terminal specified in fig 3 of the CT101 Datasheet Generally we recommend connecting the inputs with screened cables The longer the input cables are the more important is the screening If the distance between the input sockets and the CT101 PCB is short non screened cables may be used For non screened signal cables we recommend twisting the signal and the signal ground wires For each channel the cable outer conductor screen braid foil must be soldered to the flat tab connector spade terminal and the cable centre conductor core must be soldered to the round pin terminal See fig 3 Danish Audio ConnecT does not authorize or warrant the use of any of it s products in life support devices and or systems Danish Audio ConnecT sha
13. equipment please observe that the warranty of the equipment will usually no longer be valid We recommend that only trained technicians make this kind of surgery Danish Audio ConnecT does not authorize or warrant the use of any of it s products in life support devices and or systems Danish Audio ConnecT shall not be liable for any damages to connected equipment like amplifiers and loudspeakers Copyright 2001 Danish Audio ConnecT A S Denmark All rights reserved Revised 28 August 2002 ASRS O Instruction Manual DanisH Aupio ConnecT CT101 2 channel line stage linear preamplifier module Capacitor reservoir using 74 pes 2 200uF capacitors Chassis ground connection DC power supply connections separate Connector body isolated from Audio signal for each channel Audio signal 7 enclosure on i output A both sides E Cable outer TT conductor 2 200UF 35V cli screen S eni 2 200UF 35V 2 200uF 35V q q JOGUUOI Olpny ysiueq 666 i re posa y 3 E N Cable centre Ud conductor connections connections Stainless steel screws washers nuts and Metal enclosure CT101 PCB spacers included with CT101 Attenuator click house Fig 10 CT101 based preamplifier in metal enclosure Materials considerations DACT believes that magnetic materials and certain plastic materials should not be used for any parts of audio
14. erefore the attenuator resistance determines the input resistance of the complete unit So for instance a 10kOhm attenuator will fix the CT101 input resistance at 10kOhm When using a DACT attenuator with CT101 the attenuator must be soldered to the CT101 PCB in the right way Looking at CT101 with the audio input connectors pointing to the left and with the component side upwards the DACT attenuator must be mounted so the attenuator shaft points towards you See also fig 10 If a metal enclosure is used usually the attenuator will be fastened directly to a part of the enclosure so the attenuator click house is connected to chassis ground fig 10 In case the attenuator click house is not connected to chassis ground when mounted there should be made a separate connection See also the http Awww DACT com attenuator pages In certain cases it is not required to use a volume control with CT101 If there is no volume control connected to CT101 a jumper must be mounted in each CT101 channel see fig 7 In this way the input resistance is 100Mohm However usually a 100Mohm input resistance is not recommendable for audio applications Therefore two resistors may be added to reduce the input resistance See fig 8 For instance two high quality 10kOhm resistors may be added one per channel to set the input resistance at 10kOhm GAIN SETTING 199uu00 olpny USIUEO 66610 TE Joyng olpny
15. fe support devices and or systems Danish Audio ConnecT shall not be liable for any damages to connected equipment like amplifiers and loudspeakers Copyright 2001 Danish Audio ConnecT A S Denmark All rights reserved http Mwww DACT com Revised 28 August 2002 Instruction Manual DanisH Aupio ConnecT CT101 8 2 channel line stage linear preamplifier module OTHER INFORMATION Headphones Headphones may be connected directly to the output sockets of CT101 at OUT 1 and OUT 2 As headphones usually have lower impedance than 5kOhm the supply voltage for CT101 should be limited to no more than 24VDC See also the POWER SUPPLY chapter in this manual The best results may be obtained using headphones with at least 6000hm resistance Make sure to connect the phases correctly WARNING Avoid playing with the headphones at so loud volumes that your hearing is permanently affected Balanced preamplifier CT101 may be used for balanced audio signals If so one balanced audio channel requires both channels of a CT101 The positive non inverted signal is connected to one channel and the negative inverted signal is connected to the other channel If a balanced stereo preamplifier is required two CT101s have to be used one for each channel As volume control we recommend using a 4 deck DACT stepped attenuator If the two CT101s are mounted behind each other the 4 deck attenuator will fit directly into both PCBs For more information
16. ll not be liable for any damages to connected equipment like amplifiers and loudspeakers Copyright 2001 Danish Audio ConnecT A S Denmark All rights reserved Revised 28 August 2002 ASIC ee Instruction Manual DanisH Aupio ConnecT CT101 2 channel line stage linear preamplifier module NI Positive supply voltage RED 0 Zero supply voltage BLACK Negative supply voltage BLUE Fig 2 CT101 power supply connections Signal output The output terminals are marked OUT 1 and OUT 2 on the CT101 PCB and consist each of a round pin terminal and a flat tab terminal specified in fig 3 of the CT101 Datasheet Generally we recommend connecting the inputs with screened cables The longer the input cables are the more important is the screening If the distance between the input sockets and the CT101 PCB is short non screened cables may be used For non screened signal cables we recommend twisting the signal and the signal ground wires For each channel the cable outer conductor screen braid foil must be soldered to the flat tab connector spade terminal and the cable centre conductor core must be soldered to the round pin terminal See fig 3 Volume control The CT101 PCB features holes and connections for a volume control for each of the two channels marked P1 and P2 See fig 1 The layout is made so either a DACT stereo CT2 or a DACT stereo CT1 stepped attenuator will fit directly For more details ple
17. specially when building CT101 into existing equipment this way of powering it is an option Before experimenting with ready made audio equipment please observe that the warranty of the equipment will usually no longer be valid We recommend that only trained technicians make this kind of surgery Audio power supply Although CT101 has two voltage regulators for each channel built in it is recommend paying attention to the quality of the external power supply In spite of the built in voltage regulators the quality of the external power supply has significant influence on the sound quality of CT101 In our view a good audio supply for instance features ability to deliver current pulses with high speed low output resistance far beyond the audio frequency range low noise high ripple suppression Due to the low power consumption of CT101 battery operation is a possibility Sound testing of CT101 operated by batteries was including in the design phase and the results proved excellent Either rechargeable or non rechargeable batteries may be used For most types of power supplies including batteries we recommend adding some high quality reservoir electrolytic capacitors It is important that the reservoir capacitors have low ESR also at high frequencies Some electrolytic capacitors are specially optimized for higher frequencies and have ESR specified at 100kHz We recommend using these types for instance with capacitance values of 2
18. the recommend supply voltage is between 17VDC and 35VDC If CT101 is used to drive loads with lower impedance for instance headphones it is advised to limit the supply voltage to between 17VDC and 24VDC Otherwise the output devices of CT101 may become overheated Under typical use driving a 5kOhm or greater load CT101 draws less than 3mA per channel Driving lower impedances will increase the supply current Please make sure to be very careful about connecting the power supply correctly Connecting the power supply An easy and convenient way to connect the power supply is to use one or both of the 3 way connectors which are included when purchasing a CT101 see fig 4 Each of them has three wires attached and they fit the two 3 way pin connectors on the CT101 PCB shown in fig 2 Positive and negative supply connections are printed on the PCB as and The red wire must be connected to the positive supply voltage the blue wire to the negative supply voltage and the black wire to zero supply voltage Make sure to connect the power supply polarity correctly Wrong polarity may destroy CT101 and connected equipment See also the CAUTION paragraph on the last page Using an existing power supply One possibility of powering CT101 is from existing audio equipment like power amplifiers CD players etc This is often possible because CT101 requires only little supply current and because it accepts a wide supply voltage range E
19. y cracking and or breaking their solder joints When turning CT101 on for the very first time make sure to connect its outputs to an amplifier that has a volume control itself Turn the volume fully down then connect and turn on CT101 Gradually turn up the other amplifiers volume in order to prevent wrong wiring etc from damaging your other audio equipment Maintenance CT101 does not require any maintenance Modifications We do not recommend modifying your CT101 as it is already optimized Service If service is required contact your dealer and arrange for further action c Bui i DIN sa Please be very cautious when connecting the CT101 to your audio equipment CT101 is an active module and in case of wrong connections or in case of failures there is a risk of getting up to 14 15V DC offset on the output of CT101 High levels of DC offset may cause damages to power amplifiers loudspeakers or any other connected equipment Special attention is required when using DC coupled power amplifiers Before connecting the outputs of CT101 make sure of proper Do not bend the CT101 PCB operation and check the DC voltage at the CT101 outputs The DC H A fi voltage should be no more than din mVs In case of any doubt Bending it may easily damage the start out using a coupling capacitor in series with the CT101 output SMD components on the rear side Danish Audio ConnecT does not authorize or warrant the use of any of it s
Download Pdf Manuals
Related Search