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DIY Question
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DIY Question
I am currently looking into building a Speaker selector box for a friend, it is all line signal that will have two stereo outs and i need to do a summation to Mono. Am wondering weather to use relays with a low level current or just high quality Switches? also wondering what the best way to sum to Mono from a stereo signal? any help would be great.
- ian_home
- Registered User
- Posts: 3
- Joined: Tue Sep 13, 2005 12:08 am
- Location: Brisbane
Hi Ian
Please confirm:
One stereo in
Two stereo out
One mono out
3 way selector directs signal to out 1, out 2 or mono?
Or do you want any of the out permanently on?
Not hard to do at all, once we know exactly what you're after.
Please confirm:
One stereo in
Two stereo out
One mono out
3 way selector directs signal to out 1, out 2 or mono?
Or do you want any of the out permanently on?
Not hard to do at all, once we know exactly what you're after.
-
chris p - Frequent Contributor
- Posts: 882
- Joined: Tue May 10, 2005 6:15 pm
- Location: Sydney, NSW
You'll need:
1 x 4 pole 3 position rotary switch (Jaycar SR1216)
4 x 2k resistors (1/2w 1%) (Jaycar RR0570)
Input/Output connectors (XLR or TRS)
hookup wire, a knob for the rotary switch and a box to put it all in.
The rotary switch has 4 pins in the middle (A, B, C & D) and 12 pins (1 to 12 anticlockwise) around the outside. It has 3 positions:
In the first, A connects to 1, B to 4, C to 7 and D to 10
In the 2nd, A connects to 2, B to 5, C to 8 and D to 11
You can work out the third!
SO, for each balanced stereo in and out there are four wires, yes? L+, L-, R+ and R-.
In L+ goes to A
In L- goes to B
In R+ goes to C
In R- goes to D
Stereo OutA L+ to 1
Stereo OutA L- to 4
Stereo OutA R+ - to 7
Stereo OutA R+ - to 10
Stereo OutB L+ to 2
Stereo OutB L- to 5
Stereo OutB R+ - to 8
Stereo OutB R+ - to 11
Now for the mono sum:
Connect the chassis to the ground (eg S of TRS, or XLR pin 1) of In L and leave all the others unconnected.
Good luck!
1 x 4 pole 3 position rotary switch (Jaycar SR1216)
4 x 2k resistors (1/2w 1%) (Jaycar RR0570)
Input/Output connectors (XLR or TRS)
hookup wire, a knob for the rotary switch and a box to put it all in.
The rotary switch has 4 pins in the middle (A, B, C & D) and 12 pins (1 to 12 anticlockwise) around the outside. It has 3 positions:
In the first, A connects to 1, B to 4, C to 7 and D to 10
In the 2nd, A connects to 2, B to 5, C to 8 and D to 11
You can work out the third!
SO, for each balanced stereo in and out there are four wires, yes? L+, L-, R+ and R-.
In L+ goes to A
In L- goes to B
In R+ goes to C
In R- goes to D
Stereo OutA L+ to 1
Stereo OutA L- to 4
Stereo OutA R+ - to 7
Stereo OutA R+ - to 10
Stereo OutB L+ to 2
Stereo OutB L- to 5
Stereo OutB R+ - to 8
Stereo OutB R+ - to 11
Now for the mono sum:
Connect the chassis to the ground (eg S of TRS, or XLR pin 1) of In L and leave all the others unconnected.
Good luck!
-
chris p - Frequent Contributor
- Posts: 882
- Joined: Tue May 10, 2005 6:15 pm
- Location: Sydney, NSW
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