Dact CT3-5-8/Wire, CT3-3-4/Wire, CT3-6-2/Wire User Manual [ru]

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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 t wo 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.

FEATURES TYPICAL APPLICATIONS

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

Input selector in Do-It-Yourself Hi­Fi / 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

PRINCIPLES OF OPERATION

CT3-6-2, 6 positions, 2 poles

CT3-3-4, 3 positions, 4 poles

CT3-5-4, 5 positions, 4 poles

CT3-5-8/wire, 5 positions, 8 poles

CONNECTIONS, CT3-3-4

Pin no. Connection - example only (input selector)

1 Output, channel 1, signal
2 Input, channel 1, signal, source 1
3 Input, channel 1, signal, source 2
4 Input, channel 1, signal, source 3
5 Output, channel 1, ground
6 Input, channel 1, ground, source 1
7 Input, channel 1, ground, source 2
8 Input, channel 1, ground, source 3

9 Output, channel 2, signal
10 Input, channel 2, signal, source 1
11 Input, channel 2, signal, source 2
12 Input, channel 2, signal, source 3
13 Output, channel 2, ground
14 Input, channel 2, ground, source 1
15 Input, channel 2, ground, source 2
16 Input, channel 2, ground, source 3
17 Input, channel 2, signal, source 4

Seen from the rear side (connector side)

Pin no. Connection - example only (input selector)

1 Output, channel 1, signal

2 Input, channel 1, signal, source 1

3 Input, channel 1, signal, source 2

4 Input, channel 1, signal, source 3

5 Input, channel 1, signal, source 4

6 Input, channel 1, signal, source 5

7 Output, channel 1, ground

8 Input, channel 1, ground, source 1

9 Input, channel 1, ground, source 2
10 Input, channel 1, ground, source 3
11 Input, channel 1, ground, source 4
12 Input, channel 1, ground, source 5
13 Output, channel 2, signal
14 Input, channel 2, signal, source 1
15 Input, channel 2, signal, source 2
16 Input, channel 2, signal, source 3
17 Input, channel 2, signal, source 4
18 Input, channel 2, signal, source 5
19 Output, channel 2, ground
20 Input, channel 2, ground, source 1
21 Input, channel 2, ground, source 2
22 Input, channel 2, ground, source 3
23 Input, channel 2, ground, source 4
24 Input, channel 2, ground, source 5

CONNECTIONS, CT3-5-4

Seen from the rear side (connector side)

CONNECTIONS, CT3-6-2

Pin no. Connection - example only (input selector)

1 Output, channel 1, signal

2 Input, channel 1, signal, source 1

3 Input, channel 1, signal, source 2

4 Input, channel 1, signal, source 3

5 Input, channel 1, signal, source 4

6 Input, channel 1, signal, source 5

7 Input, channel 1, signal, source 6

8 Output, channel 2, signal

9 Input, channel 2, signal, source 1
10 Input, channel 2, signal, source 2
11 Input, channel 2, signal, source 3
12 Input, channel 2, signal, source 4
13 Input, channel 2, signal, source 5
14 Input, channel 2, signal, source 6

Seen from the rear side (connector side)

SPECIFICATIONS

MAXIMUM RATINGS

Note Parameter Conditions/comments Value Unit

1 Switching capacity (resistive load) 2V/2A

24V/0.6A
42V/0.4A

AC/DC

1 Operating ambient temp. range

-25 to +70

(-13 to +158)

deg. C

(deg. F)

1 Storage temperature range

-40 to +85

(-40 to 185)

deg. C

(deg. F)

2 Test voltage (contact to contact)

(contact to earth)

1,000
1,000

V
V

MECHANICAL CHARACTERISTICS

Note Parameter Conditions/comments Value Unit

Number of positions CT3-5-4/PCB, CT3-5-8/Wire

CT3-6-2/Wire
CT3-3-4/Wire

1-5
1-6
1-3

Indexing angle CT3-5-4/PCB, CT3-5-8/Wire

CT3-6-2/Wire, CT3-3-4/Wire

15
30

deg.

Switching function

non-shorting

Gold plating, contacts (hard-gold) 3 µm

Gold plating, wiper (hard-gold) 8 µm

3 Mechanical life

>25,000 cycles

Switching torque

8-9 Ncm

Nut tightening torque

max. 300 Ncm

DC ELECTRICAL CHARACTERISTICS

Note Parameter Conditions/comments Value Unit

4 Insulation resistance

(contact to contact)

(contact to earth)

> 10

13

> 10

12

Ohm

Contact resistance (new) max. 0.01 Ohm

Contact capacitance (adjacent contacts) 1 pF

Notes

1 Exposure to maximum rating conditions for extended periods of time may affect dev ice reliability
2 Rms voltage, 50 Hz, 60% relative humidity, applied for 1 minute.
3 One cycle is defined as a full rotation from one end stop to the other and return.
4 Measured with 500 VDC for 1 minute.

ANTISTATIC CHARGES

To avoid noises from antistatic charges we suggest that one of the following two
precautions is taken:

1. The CT3 is mounted with electrical connection between its click-house and
the equipment chassis.

2. A 1 MOhm resistor is connected between the CT3 click-house and equipment

ground.