F23 - FREE & OPEN LICENSED AUDIO POWER AMPLIFIER TECHNOLOGY PLATFORM

F23 is audio power amplifier technology platform specialized for class-B with Bipolar Junction Transistor implementation. This platform is developed within F23 PROJECT, with the release work licensed under the terms of compatible Clause-3 BSD License.



F23-930-BTL
930 WATTS RMS BRIDGE-TIED-LOAD POWER AMPLIFIER FOR 8-OHMS LOUDSPEAKER

F23-930-BTL is a class-B (with class-A mixed on VAS) power amplifier designed to operate in bridge-tied-load only mode per-channel. The research project to design this model is started since January 2017 and planned to finish at about April 2017.

This model is designed as a considered-SAFE-medium-voltage-supply-operated power amplifier for general purpose audio power amplifier. This model programmed to handle 8-ohms only nominal loudspeaker impedance and able to yield at about 930 watts RMS with precision power supply voltage at 73V ~ 75V DC. It will be a good choice to avoid "high risk HV operation" and avoid the need of class-H application in order avoiding "bad THD".

Modifications for DIY implementation:

WARNING: DO NOT LOAD THE OUTPUT WITH LOAD IMPEDANCE LOWER THAN 8-OHMS!

CORE CIRCUIT OF F23-930-BTL

SCHEMATICS SOURCE: https://sourceforge.net/projects/f23/files/schematics/930wrms-afpa-for-8ohm-73vdc_f23-930-btl-20170227.tar.gz

./schematics/0-930wrms-afpa-for-8ohm-73vdc_f23-930-btl-20170227.png
Click the picture to view in actual size.

BALANCED INPUT AMPLIFIER/BUFFER, LEVEL CONTROLLER AMPLIFIER, & LIMITER - FOR F23-930-BTL

SCHEMATICS SOURCE: https://sourceforge.net/projects/f23/files/schematics/930wrms-afpa-for-8ohm-73vdc_f23-930-btl-20170227.tar.gz

./schematics/1-ctl-for-930wrms-afpa-for-8ohm-73vdc_f23-930-btl-20170227.png
Click the picture to view in actual size.

PCB FOR CORE CIRCUIT OF F23-930-BTL

LAYOUT DESIGN SOURCE: https://sourceforge.net/projects/f23/files/pcb/F23-PCB-20170228.tar.gz

./schematics/2-F23-BTL-PCB.png
Click the picture to view in actual size.

PCB FOR BALANCED INPUT AMPLIFIER/BUFFER, LEVEL CONTROLLER AMPLIFIER, & LIMITER OF F23-930-BTL

LAYOUT DESIGN SOURCE: https://sourceforge.net/projects/f23/files/pcb/F23-PCB-20170228.tar.gz

./schematics/3-F23-CTL-PCB.png
Click the picture to view in actual size.

DOWNLOAD SCHEMATICS (& PCB LAYOUT DESIGN)

The schematics (& PCB layout designs) freely available at official F23 repository:
https://sourceforge.net/projects/f23/files/.

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.


LICENSE

Copyright © by F23 PROJECT MAINTAINER.
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:

  1. Redistributions of schematic must retain the above copyright notice, this list of conditions and the following disclaimer.
  2. Redistributions in derivative form must reproduce the above copyright notice, this list of conditions and the following disclaimer in the documentation and/or other materials provided with the distribution.
  3. Neither the name of the copyright holder nor the names of its contributors may be used to endorse or promote products derived from this work without specific prior written permission.

THE F23 - FREE & OPEN LICENSED AUDIO POWER AMPLIFIER TECHNOLOGY PLATFORM 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.

ADDITIONAL AGREEMENTS: THE DEVELOPER HAS THE RIGHT TO DISCONTINUE ALL SUPPORT FOR A CLIENT, IF A CLIENT CONDUCTS/CONDUCTED UNETHICAL ACT AGAINST THE DEVELOPER.