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post #131 of 498
Quote:
Originally Posted by H3||scr3am View Post
heh, well you're not on a high end balanced XLR terminated setup yet, but generally the balance won't throw people off... and there was a beautiful set of 580s with 600 grills for sale int he audio section, but I think firestorm picked them up when they hit $150...
yup
although after the purchase, this starving student gets to eat ramen noodles til my next paycheck
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post #132 of 498
sorry for the doublepost but I never stuck my portable amps here.
  • the closed one's got a gain of 11 and is "standard" BOM from Tangent
  • the open one's the "final" version after my tweaking period: gain 5, OPA2227, and alternate poly caps in C2, and a dimmed LED (RLED change)
  • the mini^3's a vanilla version using the "high performance" variant.


and a DIY audio switch I made recently... it's pretty ghetto, but gets the job done. might need to look into a preamp or something

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post #133 of 498
ow!! that looks great. I wish I could find those nice output decoupling caps as yours, I got these small polypropylene ones grrr.

I got my parts for the MINI³ from AMBs shop already, they have been lying around here before my SSMH. I just need to double check my order at farnell.

I know this might be a pain, but by coincidence I have some serious thought of building a switchbox as well (without the passive preamp, because I don't know how the imput impedance would work then) and I had yours JUST IN MY MIND.
Please, do you got some pictures of the inside for me?
When I'm using 2 input RCAs does the grounds of those get connected to each other and the case? Or are they insulated, because I fear that the common ground would be interfere. For example: if I connect my SSMH and MINI³ to it: the SSMH has a virtual ground of 19VDC if I recall, while MINI³ has an active ground which changes with the signal (I'm not sure, I don't know alot about he theoretics), wouldn't those two (when both powered on and switching between them) interfere when the grounds are common on the INPUT jack (so the outputs of the amps), and getting some sort of crossfeed.

just some pics would suffice

Nice and neatly done
Dries
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post #134 of 498
Quote:
Originally Posted by SUPER PISSED View Post
What kind of software is that I see on the monitor there?
its called PCDJ DEX
post #135 of 498
yeah, no problem llama ^_^ b.
the top on the Hammond case slides right off so it's just a matter of unplugging. and thanks for the comments, I swore I spent an hour with a compass, my calculator, and some scratch paper figuring out the correct spacing

anyway, here's the low-res; you can click them for the full resolution.
disclaimer: I'll be the first to say those aren't Litz braids. I just did a quick braid to keep the clutter down as much as possible.

white - left channel
white w/ red stripe - right channel
white w/ green and brown stripe - ground
top-down


Backpanel the 3.5mm jack is piggy-backed to the RCA jacks, not intended to use both 3.5mm and RCA simultaneously


3PDT Switch non-momentary, center off. top row wired to "B", middle wired to "I", bottom wired to "A"


  • I opted to switch the grounds as well. I guess my thoughts were closest analog to changing out the cables. made sure my multimeter didn't report continuity for the grounds
  • the end-panels are plastic so no common ground between the three channel groups there
  • the jacks just clear the case walls so the grounds don't end up linked to one another, but the case is anodized so it shouldn't be able to even if they do contact
  • the 3.5mm jack is isolated so that's why I let its mounting nut contact the RCA grounds at times
  • another thing is that this is just 22 AWG wire. I'd like lower to use it for speakers as well, but for swapping my soundcard's output to either amp or speakers it's enough.

currently I have my PC wired to the "I" so I can switch between my x530 speakers (A) when I'm not wanting to use headphones (which are B). but if you want to swap between two inputs it'll work fine as well.

edit-------------
yes, I know it's pretty ghetto; I went with the easiest way of preventing cross-channel problems. so sue me, I did it in two days so I didn't really plan it out like my normal projects
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post #136 of 498
Very nice, kudos.
You answered about all my questions. I'll probably go with a 3input/2outputs, or 3/3. With non monetary switch, it's just means it's a switch that disconnects from the first channel and before connecting to a second, preventing the signals to be on together for a fraction of a second.

i've opted to do a litzebraid for an RCAto minijack interconnect but the tutorial on chimeralabs is confusing as the pictures don't correspond with the explenation. Do you have a good link to a nice tut?

As i'm quite the beginner, this might seem like a foolish question: I spotted you connected the grounds from the RCA to each other, and still running two wires from that mutual joint, how come?

I just had the exact same vision in my head, it has the same measurements as my SSMH and would fit perfectly under it

Dries
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post #137 of 498
oh woops. didn't realize the black 3.5mm jacks were hard to see.
the second wire on the ground runs to the "sleeve" lug on the 3.5mm jacks.

other than that, it's quite simply, just a connect the dots w/ a selector switch in the middle
I'm still learning things as I go as well, so you're not alone. My current "tinkering" project is getting a pair of old 80's stereo amps rebuilt, and I'm learning quite a bit as I go.
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post #138 of 498
Thread Starter 
Quote:
Originally Posted by Firestorm252 View Post
oh woops. didn't realize the black 3.5mm jacks were hard to see.
the second wire on the ground runs to the "sleeve" lug on the 3.5mm jacks.

other than that, it's quite simply, just a connect the dots w/ a selector switch in the middle
I'm still learning things as I go as well, so you're not alone. My current "tinkering" project is getting a pair of old 80's stereo amps rebuilt, and I'm learning quite a bit as I go.
Would you say an RCA switcher is too advanced for someone who hasn't even did an interconnect yet?
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post #139 of 498
Quote:
Originally Posted by .Sup View Post
Would you say an RCA switcher is too advanced for someone who hasn't even did an interconnect yet?
I need to add that to my "to do" list
I'd wager that if you can wire up panel switches and panel jacks without starting a fire, then an RCA switch is a breeze. Just gotta keep an eye which signal is connecting where. I switched the tip and ring lugs on the 3.5mm jacks the first time around

I made it harder than necessary by choosing an enclosure that didn't give me much room for mistakes. well quite honestly the tolerance on the back is so tight I really couldn't make a mistake.

edit----------
every other post for the past page is me XD
c'mon people! Audio DIY's a fun hobby
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post #140 of 498
Quoting from my other thread since I forgot all about this one:

Quote:
Originally Posted by SkoalFineCut View Post
After having one pair of headphones too many dragged off my desk by the cat here I decided I should go about acquiring a headphone stand. However, the venerable banana hook wouldn't do for me since I don't have desk space for it, and I have more than one headphone.

So a quick trip to Lowes for some supplies and an hour or so later I have this:





1 - 2"x2"x8' treated wood
4 - screw in hooks
2 - brackets to mount to the base

I used a piece of scrap wood for the base, and some 3/8" auto hose to cover the hook's partially exposed threads.

It's definitely not the prettiest thing to look at, but for $15 it turned out nice.
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