When it's near -2v, the low side FETs are driven on. When it's near 3v, it drives the high-side FETs on. Pin 11 is used to drive the driver stage for the outputs. One will be very near the +3 and the other will be very near the -2v supply voltage. If the input on pin 3 is straight DC and above or below the top/bottom of the triangle waveform, the output on pins 9 and 11 will be straight DC. The output of pins 9 and 11 are 180 degrees out of phase (one high while the other is low - differential comparator). ![]() The instantaneous output of the square wave (pin 9 or 11) is high when the input (on pin 3) is above the instantaneous voltage of the triangle waveform and the square wave is low when the input is below the instantaneous voltage of the triangle waveform. The triangle waveform has a fixed amplitude. The square wave output on the 'digital' side is determined by those inputs. Remember: 4 ohm mono is equivalent to 2 Ohm stereo. Check the amplifier's owners manual for minimum impedance the amplifier will handle before hooking up the speakers. They show a typical single channel wiring scheme. The other side operates at lower voltages (commonly associated with digital circuits, 5v is the max supply it will generally have - sometimes +3 and -2v, other times 5v and ground). The following diagrams are the most popular wiring configurations when using Dual Voice Coil woofers. The side of the IC with the ☑1v operates much like common op-amps and comparators and can operate from higher voltage supplies than the other side of the IC. ![]() ![]() Tinsel leads woven into the spider with Kickers Spiralead technology. Since PapaZBill has a schematic, I'll let him guide you on this. 10' Comp Series Single 4-Ohm Car Subwoofer.
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