Welcome! Need support, you got it. Or share you ideas and experiences.
In the foreplay manual it says to put a 4.7K ohm resistor in series with each existing and new output. Does this mean I should continue the ground to the ground on these new terminals of the RCA jack and then put the 4.7K ohm resistor on the center terminal of the RCA jack?
Thanks,
-Jon
Follow Ups:
Yes, but there is more. Look at VoltSecond's site, the URL below.Good luck,
Grainger Morrison
There Is Only One
Grainter,
I cant really read schematics, so could you possibly explain what I would have to do? I want this second output for my Subwoofer amp.
I made this mod about a month ago. What I did was to pick up a second pair of output caps (I have two sets of the 3.3 claritys from diycable.com), two 470k & four 4.7k resistors. There is another method if you want to use only one set of output caps, but what's the fun with that 8^)0) Drill the holes, mount the new output jacks and desolder everything you have to.
1) Solder one end of both caps to pin 8
2) Solder a 4.7k resistor to the other ends of the caps
3) Attach the other leads from those resistors to the center post of the rca jack (one lead per jack)
4) run a 470k resistor from the center post to the ground tab of each rca jack (one jack should already have a resistor from the stock kit)
5) Solder the ground tabs & center posts & one side is done!
6) Repeat for the other side (ie, left if you just did right)
I like your layout of steps, so I need to find myself another set of output caps? Where can i get those from?When you say solder them to pin 8, do you mean solder one to pin 8A and one to pin 8B?
Glad you (almost) found the instructions useful ;-)The instructions were generic for one side & need to be performed on sides A and B to complete the mod.
I used four of the 3.3 clarity caps that diycable.com has on sale right now. They are going for half price & have been for some time now. You might want to order some before the sale ends.
Bear in mind that you can also add extra outputs using the stock caps.
There is a way that I can add outputs without adding four more caps you mean?
Can you explain that to me?
(I'd like to go the most simple route)
Two caps is fine, but four will probably sound better. At the very least, you owe it to yourself to upgrade from the stock caps.That said, you will leave one of the cap's leads soldered to pin 8. On the other cap lead you will make a Y with two isolation resistors. As mentioned in this thread you don't strictly need these resistors, but some people feel these are good to have. Connect one resistor lead to each of the output jacks center pegs & you are more or less done. You may want to add a 470K resistor from the center peg of the jacks to ground, but this isn't really needed with shared caps.
Hope this helps & send me an email directly if you need more help. I think this is enough for the message board.
If you use a second set of caps the 4.7k resistors can be deleted. I set my Foreplay up this way and it sounded fine. I prefer not to have any extra components in the signal path.With the single coupling cap setup, it is best to use highest quality resistors, such as Rikens.
I'm just expanding on the info from VoltSecond's page. That's what the original question was about.As for not using a serial resistor, I use 2K & didn't like the sound of anything less. Your setup might just be lucky that way.
Technically, Rrandall is right. The resistors are just a safety device to disipate the DC produced on turn on. Without them, AND if you have nothing plugged into your outputs, the DC will stay there and zap whatever gets plugged in afterward.So, if you always have something plugged in, you are ok, if not, you could do some damage.
I believe that the 4.7k resistors are there to lower distortion caused by the interaction between outputs. I don't think there is any safety issue. Correct me if this isn't right.
I was talking about the resistors from signal hot to ground of the RCA Jack? The 470k ohm resistors? They dissipate the DC that bleeds through the output cap(s) during turn on.The 4.7k ohm resistors, if that is what you are referring to, are called "R_ISO" in the schematic on the VoltSecond page below? If so, they are to give a modicum of isolation between the outputs; isolating the two power amp inputs too.
It seems we were talking about different resistors. Sorry for the confusion.
Grainger Morrison
There Is Only One
This post is made possible by the generous support of people like you and our sponsors: