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Old 31st December 2001, 01:34 PM   #1
joensd is offline joensd  Germany
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Default Tips for 6-source input-selector?

Hello!
This is my first post.
I recently built a LM3886 amplifier and wanna add an input selector (6 sources at least).
I haven´t researched alot but am interested in a solution without switches,relays.(for example mos switches 4066?)
Does anyone know good schematic,link where i can get a good working circuit for that.
It should have either up/down-switch to go through the sources or one switch for each source.
The quality should be "hifi" as well.
thanks in anticipation for any hints
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Old 31st December 2001, 01:47 PM   #2
Geoff is offline Geoff  United Kingdom
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You could have a look at the Analogue Devices SSM2160 which gives switching for six channels plus digitally controled volume and balance or if you only want the switching you could use a couple of SSM2404 quad audio switches. Similar devices are available from National Semiconductor and other ic manufacturers, though AD products are noted for their superior sound quality.
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Old 2nd January 2002, 12:56 AM   #3
joensd is offline joensd  Germany
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thanks geoff!
those devices look really cool.
just have to find a distributor and get those.
anybody built an input selector with those?
would like to see a complete application.
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Old 2nd January 2002, 01:47 AM   #4
paulb is offline paulb  Canada
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I built an input selector using the SSM2404. Worked great. Pretty much followed the datasheet; as I recall it needs a buffer afterwards for proper operation.
Email me if you would like more details.
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Old 27th June 2002, 12:02 AM   #5
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Default Input selector

Paul B,

I also have the SSM2404 chips, I would be interested as how you implemented them. Ideally, I would've preferred a 5 input source selector but, I'll settle for four. What would be the pitfalls if any?

Cheers


Brownlow
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Old 22nd July 2002, 02:08 AM   #6
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I would use a 2x6 (even better a 4x6) rotary switch and cable the inputs directly from RCAs to switch. It easy, its cheap and it sound the best.
YOu can even find boards for this job from different DIY suppliers.
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Old 22nd July 2002, 03:14 AM   #7
JoeBob is offline JoeBob  Canada
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Curious, why would a 4x6 rotary switch be any better then a 2x6 rotary if you're only doing two channels?
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Old 22nd July 2002, 03:24 AM   #8
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Default WHAT is a Selector

Quote:
Originally posted by JoeBob
Curious, why would a 4x6 rotary switch be any better then a 2x6 rotary if you're only doing two channels?
I built my own input.
I am a man - No Monkee

Pre amp have only one channel.
I use High Quality Audio Signal Cable (see brand elsewhere)
So I Change My source by Changing
The Input of my cable to
any Source

- I want to LISTEN - yes, LISTEN - to. -

So your term Selector needs a little more
EXPLAINING

but what would anyone know
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Old 22nd July 2002, 06:42 AM   #9
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With a 4x6 rotary switch you can also connect and disconnect the grounds of every signal so you can avoid ground looping of the sources, or you can also control balanced signals if there are any.

On my preamp I have a 4x3 switch because I use to allways get shocked when touching the metal boxes due to high voltage of the chassis of the TV or video. Does anybody know this feeling from connecting unconnecting SAT receiver, TV or Video ?
It sucks.
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Old 22nd July 2002, 01:43 PM   #10
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Default 5 in 1 out

Hi,

When I made my switch box I bought a switch from DACT that I found it is excellent, the problem here is missing 1 input in your case.


DACT CT3
Audio Input Selector Switch
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 shortcircuiting
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
- Test equipment selector switch
FEATURES
- 4-pole switch (switches signal and ground on
two channels simultaneously)
- Gold plated contacts for long lifetime even in
hot and humid environments
- High reliability
- Matches perfectly with DACT CT1 and CT2
audio attenuators
- “Programmable” for 1 to 5 postions
OUTLINE DRAWING AND
DIMENSIONS (mm)

Very compact 5-positions audio input selector switch (switches between up to 5 input sources)

Switches 2 channels with signal and ground simultaneously (4 poles)

All contacts are gold plated for long lifetime even in hot and humid environments

Same basic construction and size as the DACT CT1 and CT2 audio attenuators

Ideal together with DACT CT1 or CT2 for active or passive preamplifiers


Regards,
Chris
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