My first attempt at building something electronic.. I thought it would be easy but I can't seem to get this thing to work.
I basically followed the same design http://www.groupdiy.com/index.php?topic=16731.0
I used 1/2 watt 10K resistors from the direct + and - terminals, and 220 ohm resistors across the two main busses. I pretty sure I got the terminals right because I have a multimeter and tested the tip, sleeve, ring terminals before I started building it.
After finishing, I brought up a mix, 5 stereo busses, sent them out via my echo audiofire12, used 2 gap pres for the makeup gain and sent these back to the daw using the last 2 channels. Nada... The pre's don't register any signal coming from the summing box, even when I turn the gain right up there is just nothing coming out. Does anyone have any ideas where things have gone wrong or why it might not be doing what it should?
There are pictures over at my post on gearslutz: http://www.gearslutz.com/board/so-much-gear-so-little-time/503150-tried-build-passive-summing-box-failed.html
I wasn't entirely sure what to do with the grounding either.. I just connected a shielded copper wire to each sleeve terminal on the TRS jacks, and pin 1 on each XLR, then soldered this to a screw going into the case.
Cheers
I basically followed the same design http://www.groupdiy.com/index.php?topic=16731.0
I used 1/2 watt 10K resistors from the direct + and - terminals, and 220 ohm resistors across the two main busses. I pretty sure I got the terminals right because I have a multimeter and tested the tip, sleeve, ring terminals before I started building it.
After finishing, I brought up a mix, 5 stereo busses, sent them out via my echo audiofire12, used 2 gap pres for the makeup gain and sent these back to the daw using the last 2 channels. Nada... The pre's don't register any signal coming from the summing box, even when I turn the gain right up there is just nothing coming out. Does anyone have any ideas where things have gone wrong or why it might not be doing what it should?
There are pictures over at my post on gearslutz: http://www.gearslutz.com/board/so-much-gear-so-little-time/503150-tried-build-passive-summing-box-failed.html
I wasn't entirely sure what to do with the grounding either.. I just connected a shielded copper wire to each sleeve terminal on the TRS jacks, and pin 1 on each XLR, then soldered this to a screw going into the case.
Cheers