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PostPosted: Tue Oct 03, 2017 7:19 pm 
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Location: Newcastle, ON, CA
Where can I purchase a cable that will join my L+R stereo preamp's output into a single mono rca output? I've seen diagrams to make one using resistors but my workmanship would be terrible so I was looking for a nice cheap prepackaged item.


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PostPosted: Tue Oct 03, 2017 8:15 pm 
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Location: Hamilton, ON, CA
I built a summing box about a year ago.

It was quite easy to build and I kept a diagram with close up pictures...

In fact, I am sure I could build you one.

What were you hoping for in fair price for one?


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PostPosted: Tue Oct 03, 2017 9:26 pm 
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JGP wrote:
I built a summing box about a year ago.

It was quite easy to build and I kept a diagram with close up pictures...

In fact, I am sure I could build you one.

What were you hoping for in fair price for one?



Can it be made to look like a simple Y-adaptor?

PM'd


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PostPosted: Wed Oct 04, 2017 12:56 am 
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PERRLA wrote:
JGP wrote:
I built a summing box about a year ago.

It was quite easy to build and I kept a diagram with close up pictures...

In fact, I am sure I could build you one.

What were you hoping for in fair price for one?



Can it be made to look like a simple Y-adaptor?

PM'd



Absolutely, I've done it in the past with both RCA and XLR cables for various setups

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PostPosted: Wed Oct 04, 2017 3:20 am 
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The Source.ca list options to do this


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PostPosted: Wed Oct 04, 2017 4:16 am 
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Location: Repentigny, QC, CA
Available on Net
2m long will work?
Search Ebay : RCA to Dual RCA Phono Splitter Y Cable for Subwoofer Speaker Stereo OFC Hifi 2M
eg. http://www.ebay.com/itm/RCA-to-Dual-RCA ... 0005.m1851


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PostPosted: Wed Oct 04, 2017 4:24 am 
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Location: Hamilton, ON, CA
Y splitters WILL NOT work.
You won't get true mono. You absolutely need to use resistors - those eBay patch cables will not work and if your output device has op amps, you may damage them. I will post a picture tonight of what a proper one should look like.


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PostPosted: Wed Oct 04, 2017 8:51 am 
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This (below) is a great explaination of why to not use a "y splitter"; taken from elsewhere:

Here’s the rule: outputs are low impedance, and must only be connected to high impedance inputs. You should never tie two audio outputs directly together! If you do, each output tries to back-feed into the other, and drive the very low impedance of the other output, forcing both outputs into current-limit. At best, this can cause signal loss, audible distortion (popping and clicking sounds), and weird phasing effects. At worst, over time it can actually cause damage to your equipment.


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PostPosted: Wed Oct 04, 2017 9:30 am 
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Location: Newcastle, ON, CA
JGP wrote:
Y splitters WILL NOT work.
You won't get true mono. You absolutely need to use resistors - those eBay patch cables will not work and if your output device has op amps, you may damage them. I will post a picture tonight of what a proper one should look like.


I think I'll give it a try and use shrink wrap to make it look somewhat tidy. Parts Connexion has resistors of varying costs $0.20 - $5.00. There are also many variations of 10k Ohm eg. 1/4W, 1W, 2W... I have no understanding of electronics so which "watts" do I choose and why? Also for the RCA connectors should I just choose something in the middle pricewise. What guage of wire is recommended? Would it be best to just hack away at an existing prefab cable and use those connectors/wires?


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PostPosted: Wed Oct 04, 2017 10:02 am 
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Newcastle is in a built up enough area that it would probably be better for us and for you to find you a place where you can buy a proper mono adapter at a reasonable price. That is probably the overall best way out of this one.

First place to look: music supply shops.

Second place to look: electronics supply shops. Even tiger direct. Or Canada Computers.

Basically, a place where it is a common in stock item made for general use.

This is the wiring, in a general way:

Image

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PostPosted: Wed Oct 04, 2017 2:22 pm 
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Location: Hamilton, ON, CA
Here is mine.

-- 04 Oct 2017 23:25 --

Again, you can certainly try yourself - or have someone do it for you.

Resistors are not expensive, rca & project box - together may be about 20 bucks.


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PostPosted: Fri Oct 06, 2017 8:18 am 
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Location: Newcastle, ON, CA
JGP: I noticed that your diagram is different form the one Teo Audio posted. Why is there the 20K resistor there? Also I've seen diagrams using two 10K (1/4W???) resistors alone.


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PostPosted: Fri Oct 06, 2017 8:28 am 
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I can't comment on Teo's diagram.
I did see that one on line when I researched to build mine; however, I opted for the latter that has worked quite well in my vintage set up.

Mine is two 10k equalling 20.

I could not get the correctly rated 20k resistor at 1%.
They had larger tolerances, which I did not want.

Here is another designed like mine.
https://www.google.ca/amp/hasafraker.co ... el-amp/amp


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