FREE & OPEN LICENSED AUDIO POWER AMPLIFIER TECHNOLOGY PLATFORM
MATRIX 1.4 II T13 is a fusion of the origin of MATRIX 1.4 and F23 AUDIO POWER AMPLIFIER TECHNOLOGY PLATFORM, a reformulation for improvements to gain better application performances and to simplify the core circuit model. While F23 designated to apply complex circuit model (to guaranty precision), MATRIX 1.4 II T13 designated for simplicity and for who wants to do more handy customization.
The experimentation at last week of January 2017 in developing F23 - discovered the maximum proper peak of output voltage in high frequency amplification (20KHz) is Vpeak = VCC - 13V; In example, if VCC is 73V DC, the peak output voltage ought be about 60V-peak for high frequency amplification performs with low THD. So, we think that it is good to give the additional code name of "T13" for the fusion of MATRIX 1.4 with F23.
T13-X73-1 or X73-1 variant is modeled to apply "old famous audio power transistor": MJ15003+MJ15004 with result lowest THD as possible. The circuit-system is designed to operate with 73V ~ 75V DC precision power supply; The power supply unit can be applied with the power transformer with output 55V AC or 56V AC with CT, with bridge-mode rectifier. This variant is designed to handle 4-ohms loudspeaker impedance. However it will still be able to handle 2-ohms loudspeaker impedance with of course increasing the THD. Maximum proper input amplitude in is about 1.74V-peak or about +4dBU (1.78dBV or 1.23V RMS) to resolve 60V-peak or 42.4V RMS output amplitude.
Current released revision of core-circuit schematic: REVISION 2, July 07, 2017. (Release notes & any other documentations were under written.)
This output-protector circuit is mainly designed for XH120-P700-SVS-Li. However, it ought be applicable for any sub-model of T13.
Replace R617A and/or R617B with any appropriate values to implement any different relay model.
The schematics (& PCB layout designs) freely available at official F23 repository:
Each distribution package contains original source & binary form (PDF). The original schematics in the extension of gEDA-gschem schematic. The original PCB layout design in extension of KiCad Pcbnew. You will be able to view or edit the design of schematic & PCB if using PC/laptop that installed GNU/Linux operating system + GEDA/GAF + KiCad. Each package also include SPICE3 netlist & transient-test script (shell script) for referencing the SPICE simulation using NGSPICE.
MATRIX 1.4 II T13 is released under dual license: (1) Open Source Hardware License and (2) Clause-3 BSD License.Copyright © by MATRIX 1.4 II T13 PROJECT MAINTAINER, F23 PROJECT MAINTAINER, HERU HIMAWAN TEJO LAKSONO. All rights reserved.
Redistribution and use in schematic and any derivative forms, with or without modification, are permitted provided that the following conditions are met:
MATRIX 1.4 II T13 FREE & OPEN LICENSED AUDIO POWER AMPLIFIER TECHNOLOGY PLATFORM AND/OR MATRIX 1.4 II T13 SCHEMATIC IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS WORK, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.