Xover Module
Single module LTspice simulations:
Single module LTspice simulations:
The Xover Filter Module
The Xover Filter Module
3 X matched 2nd order precision State Variable Filters (SVF), configurable like a 4th order (SVF).
PCB Dimensions:
PCB Dimensions:
Double sided 220mm Length x 130mm Width x 1.6mm thickness, 1Oz. copper for square feet.
Digital controller:
Digital controller:
I2C controller: MCP23017 with selectable address
Relays drivers: ULN2804A or ULN2803A depending from running voltages
2 X 10-LED-Bar for debug
Operational-Amplifiers:
Operational-Amplifiers:
OP-Amps: Dual OP-Amps like TL072, NE5532, OPA2134 or any unity-gain stable pin compatible (and voltage compatible off-course) dual op-amp.
There are many discrete OP-Amp choices with the same pin out, even discrete ones.
Input Impedance: around 100 KOhm depending from OP-Amp choice.
Controls from MCU:
Controls from MCU:
- Bit-1 = 12db/oct - 24db/oct selection
- Bit-2 and Bit-3 = Geometry (Butterworth, Bessel1, Bessel2, Linkwitz-Riley)
- Bit-4 to Bit-8 = Crossover Frequency
Dual latched micro relay types:
Dual latched micro relay types:
20 X AGN2104H or AGN2104HJ
Grounding:
Grounding:
- Separated Analog and Digital Ground planes
- Built-in RC Loop Breaker for Analog Grounding
- Built-in Electromagnetic Interference (EMI) filter and Radio Frequency (RFI) filter for Digital Grounding
Connections:
Connections:
Golden plated Molex KK (2.54mm pitch) series connectors:
- Digital I2C = 5-pin Molex KK
- Audio input = 2-pin Molex KK
- Audio output = 4-pin Molex KK
- Analog Power supply = 3-pin Molex KK
Cable-less Board-to-Board connections:
- I2C = 5-pin header (20mm long metal pin)
- Audio output to next board audio input = 2-pin header (20mm long metal pin)
- Analog Power Supply = 3-pin header (20mm long metal pin)