I have a hack, but unfortunately my wife and I have "temporarily misplaced" our digital camera, so I can't post pics yet. I figured I would ask some advice, so when I open it back up to take pics I can make some adjustments if y'all have any advice.
I have housed a home built mic-preamp in an Apple brand external SCSI drive enclosure (from 1996). The mid-90s beige decor nicely matches my audio-centric Color Classic Taco (which is functional again). The front power button and LED power indicator are functional. The plug-in jacks are mounted on the rear panel. The circuit is small, and I hope to build an amplifier to power small speakers in the remaining space.
The mic-pre is based on this circuit.
This is the first circuit I've ever built! Mine's built on perf-board, not PCB. The main differences in my circuit include: the 2.2 uF capacitors are not polarized (ratty shack didn't have any). I'm using a TL082 op-amp IC rather than the 5532 (everything was from whatever ratty shack had in stock). It's hard wired with a 1k resistor controlling the gain, rather than having a switch. I tried a couple different resistor values and I guess for my purposes and my mic I guess it needs that much gain. I am running it off of 9v, I originally wanted to use a 12v wall adapter, but I got a lot of hum that I don't get with batteries. Using a 9v battery was easier than stringing together 8 1.5v cells. Oh, and the LED I'm using is not in that original circuit. I don't know if that would have any effect.
The pre-amp is pretty noisy, a lot of hiss. I'd like advice on how to get that down. Is it that it's not on PCB? It is my amateurish soldering? Is it the lack of polarization on the DC filtering capacitors? Is it just to be expected from an op-amp circuit with no negative power supply? I know it's hard to diagnose things over the web, but if I make modifications or re-do it, I'd like to know what changes are likely to be most effective.