I think there's an audiophile or 2 listening. So now its time to brag.
I've finished designing my mic preamp on paper. Gonna order some parts and build a prototype.
So basically here's all of the specs on it:
Power Supply: 15VAC, low ripple, low noise. It will feed 48 for phantom power as well as, obviously, powering the preamp circuits. It will have a seperate auxiliary power for "noisy" things like LEDs and such.
Backplane: I'm making a modular preamp. Essentially the chassis will consist of the power supply and that's about it. Each module will plug into the backplane with a 15-pin connector.
Back panel: Each module will have an XLR in and 1/4" phone out. The in is "mic level" (see below) and the out is line-level.
Front panel: Each module will have:
- Level: The final level out
- Gain: The mic gain. The sound will be a function of gain and level of course.
- Input Impedence: 500-ohm or 2K-ohm.
- +48V Phantom Power
- High pass (select to cut at 160Hz or 1KHz)
- Low pass (select to cut at 160Hz or 1KHz)
- LED VU bar
- Clip LED
I'm going to put it all in a 2U rackmount enclosure with enough spots for up to 16 mics. I expect each module to cost me about $10 - $20 in parts, so no need to go straight to the 16.
I'm really excited to put the thing together. I look forward to doing the build. I'm coming in with a 15VAC AC/AC adapter because, well frankly I'm not comfortable doing the transformer / mains thing. Scares the hell outta me to be honest.
When all is said and done, I'll have a studio-quality preamp that would probably cost a good $10,000 if I were to buy retail. No exaggeration.
Next will be my mixer. I'm looking forward to that too. :)