DIY Question

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DIY Question

Postby ian_home » Sat Sep 30, 2006 6:37 pm

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.
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Postby chris p » Sat Sep 30, 2006 8:14 pm

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.
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Postby ian_home » Sat Sep 30, 2006 8:26 pm

Hi Chris,
1x balanced stereo in
2x balanced stereo out
1x balanced mono out.

none on permanently, only one selected at a time.
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Postby chris p » Sat Sep 30, 2006 11:14 pm

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.

Image

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:
Image

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!
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Postby ian_home » Sun Oct 01, 2006 11:59 am

Thank you very much
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