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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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 Click here to download PDF version (199KB) of this CT3 data sheet.
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CT3
Audio Input Selector Switch |
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DESCRIPTION
CT3 is a high quality Audio Input Selector
Switch.
It is based on the same high precision, Swiss made switching
mechanism as the DACT CT1 and 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
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.
TYPICAL APPLICATIONS
- 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
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Test equipment
selector switch
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FEATURES
-
4-pole switch (switches signal and ground
on
two channels simultaneously)
- Gold plated contacts for
long lifetime even in
hot and humid
environments
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High reliability
- Matches perfectly with DACT CT1
and CT2
audio attenuators
- “Programmable” for 1 to 5
postions
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OUTLINE DRAWING AND DIMENSIONS
(mm) |
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SPECIFICATIONS |
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MAXIMUM RATINGS |
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Note |
Parameter |
(conditions / comments) |
Value |
Unit |
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1 |
Switching capacity |
(resistive load) |
2V/2A
24V/0.6A
42V/0.4A |
AC/DC |
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1 |
Operating ambient temp.
range |
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-25 to
+70 |
deg.C |
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1 |
Storage temperature
range |
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-40 to
+85 |
deg.C |
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2 |
Test voltage |
(contact
to contact)
(contact to earth) |
1000
1000 |
V | |
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MECHANICAL CHARACTERISTICS |
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Note |
Parameter |
(conditions / comments) |
Value |
Unit |
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Number of positions |
(mechanical setting) |
1-5 |
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Indexing angle |
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15 |
deg. |
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Switching function |
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Non-shorting |
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Gold plating,
contacts |
(hard-gold) |
3 |
um |
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Gold plating, wiper |
(hard-gold) |
8 |
um |
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3 |
Mechanical life |
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>
25,000 |
cycles |
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Switching torque |
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9 |
Ncm |
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Nut tightening torque |
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Max. 300 |
Ncm | |
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DC
ELECTRICAL CHARACTERISTICS |
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Note |
Parameter |
(conditions / comments) |
Value |
Unit |
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4 |
Insulation
resistance |
(contact
to contact)
(contact to earth) |
>
1013
> 1012 |
ohm |
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Contact resistance |
(new) |
Max.
0.01 |
ohm |
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Contact capacitance |
(adjacent contacts) |
1 |
pF | |
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Notes
1 Exposure to maximum rating conditions for extended periods of
time may affect device 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. |
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PRINCIPLES OF
OPERATION
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CONNECTIONS
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Pin
no. |
Connection |
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1 |
Output, channel 1,
signal |
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2 |
Input, channel 1, signal, source
1 |
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3 |
Input, channel 1, signal, source
2 |
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4 |
Input,
channel 1, signal, source 3 |
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5 |
Input, channel 1, signal, source
4 |
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6 |
Input, channel 1, signal, source
5 |
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7 |
Output, channel 1,
ground |
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8 |
Input, channel 1, ground, source
1 |
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9 |
Input, channel 1, ground, source
2 |
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10 |
Input, channel 1, ground, source
3 |
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11 |
Input, channel 1, ground, source
4 |
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12 |
Input, channel 1, ground, source
5 |
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13 |
Output, channel 2,
signal |
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14 |
Input, channel 2, signal, source
1 |
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15 |
Input, channel 2, signal, source
2 |
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16 |
Input, channel 2, signal, source
3 |
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17 |
Input, channel 2, signal, source
4 |
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18 |
Input, channel 2, signal, source
5 |
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19 |
Output, channel 2,
ground |
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20 |
Input, channel 2, ground, source
1 |
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21 |
Input, channel 2, ground, source
2 |
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22 |
Input, channel 2, ground, source
3 |
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23 |
Input, channel 2, ground, source
4 |
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24 |
Input, channel 2, ground, source
5 | |
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ANTISTATIC
CHARGES
To avoid noises from antistatic charges we
suggest that one of the following two precautions is
taken: |
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1 |
CT3 is mounted with
electrical connection between its click-house and the
equipment chassis. |
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2 |
A 1 MOhm resistor is
connected between the CT3 click-house and equipment
ground. | | |
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ORDERING
INFORMATION |
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Part number |
Description |
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CT3-5-4/Wire |
Audio input selector switch, 1-5
positions, 2 channels, switches input and ground (4 poles). With
solder lugs for wires. |
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CT3-5-4/PCB |
Audio input selector switch, 1-5
positions, 2 channels, switches input and ground (4 poles). For
soldering into a PCB. |
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CT-knob1 |
Stainless steel knob for CT1, CT2
and CT3, raw steel look, 25 mm (1”) diam. |
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CT-ext1/S |
Shaft extension kit. Version with
short extension shaft (200 mm = 7.87”) |
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CT-ext1/L |
Shaft extension kit. Version with
long extension shaft (400 mm =
15.75”) | |
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