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DACT
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DACT audio input selector switch. Danish Audio ConnecT manufactures the CT3 High-End audio input selector switch for Hi-Fi, A/V and Pro-Audio, used by DIY Audiophiles and audio equipment manufacturers throughout the world: CT3 has 4 poles allowing it to switch 2-channels, both signal and ground, simultaneously. CT3 is mechanically programmable for 1-5 input sources, and is available with solder lugs for wires or for PCB mounting.
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CT3 is a high quality Audio Selector Switch.
It is based on the same high precision, Swiss made switching mechanism as the DACT CT2 audio attenuators.
CT3 is a non-shorting type of switch making sure neither of the input sources will be short-circuiting each other when the switch is operated.
CT3-5-4/PCB switches two channels simultaneously. For both channels it switches signal AND ground. This is an effective way to minimize the risk of creating ground loops.
In the same way CT3-5-8/wire switches 8 poles.
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FEATURES
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TYPICAL APPLICATIONS
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- 2/4/8-pole switches 2/4/8 channels simultaneously
- Gold plated contacts for long lifetime even in hot and humid environments
- High reliability
- Matches perfectly with DACT CT2 audio attenuators
- Mechanically “programmable” for 1 to 3 or 5 or 6 postions
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- Input selector in Do-It-Yourself Hi-Fi / audio projects
- Input selector switch in active or passive preamplifiers
- Selector switch in professional audio equipment
- Switch for long lifetime applications
- Test equipment selector switch
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PRINCIPLES OF OPERATION
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 CT3-6-2, 6 positions, 2 poles
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 CT3-3-4, 3 positions, 4 poles
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 CT3-5-4, 5 positions, 4 poles
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 CT3-5-8/wire, 5 positions, 8 poles
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CONNECTIONS, CT3-6-2
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Pin no.
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Connection - example only (input selector)
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1
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Output, channel 1, signal
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2
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Input, channel 1, signal, source 1
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3
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Input, channel 1, signal, source 2
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4
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Input, channel 1, signal, source 3
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5
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Input, channel 1, signal, source 4
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6
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Input, channel 1, signal, source 5
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7
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Input, channel 1, signal, source 6
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8
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Output, channel 2, signal
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9
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Input, channel 2, signal, source 1
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10
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Input, channel 2, signal, source 2
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11
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Input, channel 2, signal, source 3
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12
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Input, channel 2, signal, source 4
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13
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Input, channel 2, signal, source 5
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14
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Input, channel 2, signal, source 6
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Seen from the rear side (connector side)
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CONNECTIONS, CT3-3-4
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Pin no.
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Connection - example only (input selector)
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1
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Output, channel 1, signal
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2
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Input, channel 1, signal, source 1
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3
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Input, channel 1, signal, source 2
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4
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Input, channel 1, signal, source 3
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5
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Output, channel 1, ground
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6
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Input, channel 1, ground, source 1
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7
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Input, channel 1, ground, source 2
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8
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Input, channel 1, ground, source 3
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9
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Output, channel 2, signal
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10
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Input, channel 2, signal, source 1
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11
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Input, channel 2, signal, source 2
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12
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Input, channel 2, signal, source 3
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13
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Output, channel 2, ground
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14
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Input, channel 2, ground, source 1
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15
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Input, channel 2, ground, source 2
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16
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Input, channel 2, ground, source 3
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17
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Input, channel 2, signal, source 4
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Seen from the rear side (connector side)
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Pin no.
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Connection - example only (input selector)
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1
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Output, channel 1, signal
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2
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Input, channel 1, signal, source 1
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3
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Input, channel 1, signal, source 2
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4
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Input, channel 1, signal, source 3
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5
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Input, channel 1, signal, source 4
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6
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Input, channel 1, signal, source 5
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7
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Output, channel 1, ground
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8
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Input, channel 1, ground, source 1
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9
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Input, channel 1, ground, source 2
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10
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Input, channel 1, ground, source 3
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11
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Input, channel 1, ground, source 4
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12
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Input, channel 1, ground, source 5
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13
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Output, channel 2, signal
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14
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Input, channel 2, signal, source 1
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15
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Input, channel 2, signal, source 2
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16
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Input, channel 2, signal, source 3
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17
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Input, channel 2, signal, source 4
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18
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Input, channel 2, signal, source 5
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19
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Output, channel 2, ground
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20
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Input, channel 2, ground, source 1
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21
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Input, channel 2, ground, source 2
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22
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Input, channel 2, ground, source 3
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23
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Input, channel 2, ground, source 4
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24
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Input, channel 2, ground, source 5
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CONNECTIONS, CT3-5-4
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Seen from the rear side (connector side)
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Panel cut-out
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OUTLINE DRAWING AND DIMENSIONS
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SPECIFICATIONS
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MAXIMUM RATINGS
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Note
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Parameter
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Conditions/comments
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Value
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Unit
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1
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Switching capacity
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(resistive load)
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2V/2A
24V/0.6A
42V/0.4A
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AC/DC
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1
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Operating ambient temp. range
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-25 to +70
(-13 to +158)
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deg. C
(deg. F)
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1
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Storage temperature range
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-40 to +85
(-40 to 185)
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deg. C
(deg. F)
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2
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Test voltage
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(contact to contact)
(contact to earth)
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1,000
1,000
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V
V
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MECHANICAL CHARACTERISTICS
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Note
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Parameter
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Conditions/comments
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Value
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Unit
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Number of positions
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CT3-5-4/PCB, CT3-5-8/Wire
CT3-6-2/Wire
CT3-3-4/Wire
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1-5
1-6
1-3
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Indexing angle
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CT3-5-4/PCB, CT3-5-8/Wire
CT3-6-2/Wire, CT3-3-4/Wire
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15
30
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deg.
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Switching function
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non-shorting
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Gold plating, contacts
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(hard-gold)
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3
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μm
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Gold plating, wiper
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(hard-gold)
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8
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μm
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3
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Mechanical life
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>25,000
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cycles
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Switching torque
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8-9
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Ncm
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Nut tightening torque
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max. 300
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Ncm
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DC ELECTRICAL CHARACTERISTICS
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Note
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Parameter
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Conditions/comments
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Value
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Unit
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4
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Insulation resistance
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(contact to contact)
(contact to earth)
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> 1013
> 1012
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Ohm
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Contact resistance
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(new)
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max. 0.01
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Ohm
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Contact capacitance
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(adjacent contacts)
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1
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pF
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Notes
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1
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Exposure to maximum rating conditions for extended periods of time may affect device reliability
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2
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Rms voltage, 50 Hz, 60% relative humidity, applied for 1 minute.
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3
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One cycle is defined as a full rotation from one end stop to the other and return.
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4
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Measured with 500 VDC for 1 minute.
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ANTISTATIC CHARGES
To avoid noises from antistatic charges we suggest that one of the following two precautions is taken:
- The CT3 is mounted with electrical connection between its click-house and the equipment chassis.
- A 1 MOhm resistor is connected between the CT3 click-house and equipment ground.
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To the top 
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