Balanced microphone preamp project

  
Well, it's pretty much a PAiA preamp - usual input circuity followed by one half of dual op-amp rigged in fixed 20dB amplification circuity, followed by second stage which is adjustable for up to 40dB amplification, for up to 60dB total. The power supply is a simple affair, supplying +-12V using 7912 and 7812 regulators. As ECM8000 is happy with only 15 volts of phantom power, I added a 7805 which I referred to +12V instead of ground - resulting in 17V output which I used for phantom power.
Balanced microphone preamp project - schematic

The schematics shows NE5532 op-amp which I was unable to get when I shopped for parts, so I used an ancient JRC4558D op-amp which I scavanged from PCB of old Yamaha synth (some people seem to be very fond of this chip, maybe some day someone will tell me



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