![]() ![]() A couple topology decisions will help fill in the details of your blocks.īlocks like headphone amp, and talkback preamp can be built as modules and wired in. The next step is to nail down your front panel. Does this look sensible relative to how a typical analog board would be routed? I've done preamps and a summing mixer along with tons of tube stuff, but this one feels like it needs more planning. Right now it feels like my urgent need is a little 4 channel, 2 stereo bus console with a couple of aux sends. Whether or not the headphone amp, talkback mic/amp, or monitor switching are internal to this project is very much negotiable. ![]() Maybe as little as all-passive aside from the summing. Also I think I'll try to minimize active stages at the expanse of slightly higher impedances and potentially a little noise. Frankly I may use it for the input buffers too. I used the OPA1632 on recent project and I think it's a good fit for the summing amps. I built my summing amp and I'll use the same approach at each of the summing stages: four virtual ground mixers, 2 per L/R channel, 1 each for hot and cold. Because of the simplicity (no EQ or dynamics) I think I can stay balanced throughout the device from input to output. Of course, I don't know why I'd record more than one stereo source in this scenario so maybe I just need a rotary switch on the record out that selects with channel to send. I could also see myself using a third aux send to steer signals to the record outs rather than switches. The bussing will be a network of switches and resistors that assign sources to summing stages. I made the simplest diagram I could to linearize my thoughts. I think the assignments to the record out should be prefader and pan. And obviously I'd want to monitor input and output in the analog realm most of the time while sending performance to the two track. I would route the playback return to the two track for mix down with the summing amp/outboard. The ability to route the four input channels mentioned above to a 'two track' out (going to converter inputs) and/or a 'monitor path', simultaneously or exclusively. Send some signals to an external FX unit (also pre-fader? or maybe an aux off of an aux?) for headphone wetness and somehow get it back into the cue mix. Send those signals to a cue mix for headphones (I think pre-fader). These would have simple level controls and LCR Panning (if any panning, not sure). Route in 2 channels of performance material (preamps) and 2 channels of playback (either DAW mix down or the output of my summing box). I typically am only recording 1 or 2 tracks at a time and want to keep this simple, small, and sonically transparent. It's been a long time since I've used an analog board so I'm trying to work out some routing for my scenario. I historically have only recorded guitars and never had an issue with low latency monitoring but now I'm trying some vocal tracking and learning about the needs for a cue mix and effects. I'm exploring a build to solve a problem in my project studio. ![]()
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