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 X3 : active blend preamp with 3 band EQ

x3preamp
  • active only
  • independent input stage for each pickup
  • buffered signals are mixed in the active path
  • smooth blend control, no insertion loss at center
  • 0..+10dB independent gain control (also externally switchable)
  • can even match active pickup with passive, P with J, etc.. as well as identical pairs
  • independently selectable input impedance/pickup load
  • selectable EQ frequencies:
       bass: +/- 12 dB @ 40/80 Hz
       mid: +/- 12 dB @ 220/400/600/900/1800 Hz
       treble: +/- 14 dB @ 4/5/10/20 KHz
  • power: 9V, 1.3 mA
  • dimensions: 45 x 30 x 15mm (1.77" x 1.18" x 0.59") without wires
wiring (click for hungarian .pdf):

 Battery fuel gauge

battery
  • your phone has it. your car has it. now your bass has it too.
  • optimized for 9V, max input voltage is 30V
  • blinks after you plug in, then goes to low power mode until you unplug the cable
  • sleep current is less than 3 uA
  • zero power consumption while the cord is disconnected
  •    3 pulses: battery voltage is above 7.5 V
       2 pulses: U > 6.5 V
       1 pulse: U > 5.5 V
       S.O.S. signal: U < 5.5 V, replace battery
  • bright green LED, visible under direct sunlight
  • PCB dimensions: 25.4 x 9 mm (1" x 0.36"), LED diameter: 3mm
  • optional 3mm diffuse light guide available (installation example pictured below)


lightguide



low-res video: