Technical specifications:
Inputs: Digital USB audio and Analog stereo.
Controls: Volume, Mute, Balance, Treble and Bass, SuperBass algorithm.
Output: Analog Stereo.
In the assembly we use USB audio transport Reflex and DSP processor ADAU1701. Reflex works in Slave mode and is clocked by ADAU1701. ADAU1701 in Master mode.
I described the Reflex transport earlier. You can see it.
The module with ADAU1701 is a board with a DSP ADAU1701 and two generators.
The first generator with a frequency of 12.288 MHz, and the second with a frequency of 11.2896 MHz. The scheme is like this:
The PCB can be viewed and ordered from the KiCad project.
First, an audio project is made in SigmaStudio.
At the input there is a selector that switches inputs: Analog and Digital USB. Behind it there is a volume control and a balance control. Next are the LF and HF tone controls. Before the output there is the SuperBass algorithm. For each sampling frequency there are projects that are identical in scheme, but different in register settings depending on the sampling frequency.
Be careful with the register settings if you want to change my project. They must remain unchanged for each sampling frequency.
Transport Reflex Depending on the sampling frequency on the I2C bus, it rebuilds the ADAU170 registers, switches the generators installed on the ADAU1701 board and loads the required project into the ADAU. Everything is done automatically.
The control elements (potentiometers, buttons and LEDs) are connected to the GPIO outputs on the Reflex according to the ChipStudio diagram. You can assign any others.
Download ChipStudio software, unpack it on your PC. Open the combo project in ChipStudio. Put jumper 12 on Reflex, connect Reflex to the PC, load the combo project into it, remove jumper 12 and everything works for you.
The connection block diagram is as follows:
Please pay attention to the installation of jumpers.
I have a front panel from a DSP Machine.
SigmaStudio Projects
Combo project for ChipStudio
Firmware for Reflex
KiCad project
ChipStudio soft
For now, you can order boards from the KiCad project and make PCBs with adau1701 and Reflex yourself. They are very simple.
I will answer any questions.
Follow the headlines ChipDipDAC did it, so can you. I will show examples of how to do it.
The next project is DSP Machine 3. Hi-Res Streamer (ADAU1452+AD1934) for Raspberry Pi (driver & overlay ChipDip DAC)
Enjoy!
Inputs: Digital USB audio and Analog stereo.
Controls: Volume, Mute, Balance, Treble and Bass, SuperBass algorithm.
Output: Analog Stereo.
In the assembly we use USB audio transport Reflex and DSP processor ADAU1701. Reflex works in Slave mode and is clocked by ADAU1701. ADAU1701 in Master mode.
I described the Reflex transport earlier. You can see it.
The module with ADAU1701 is a board with a DSP ADAU1701 and two generators.
The first generator with a frequency of 12.288 MHz, and the second with a frequency of 11.2896 MHz. The scheme is like this:
The PCB can be viewed and ordered from the KiCad project.
First, an audio project is made in SigmaStudio.
At the input there is a selector that switches inputs: Analog and Digital USB. Behind it there is a volume control and a balance control. Next are the LF and HF tone controls. Before the output there is the SuperBass algorithm. For each sampling frequency there are projects that are identical in scheme, but different in register settings depending on the sampling frequency.
Be careful with the register settings if you want to change my project. They must remain unchanged for each sampling frequency.
Transport Reflex Depending on the sampling frequency on the I2C bus, it rebuilds the ADAU170 registers, switches the generators installed on the ADAU1701 board and loads the required project into the ADAU. Everything is done automatically.
The control elements (potentiometers, buttons and LEDs) are connected to the GPIO outputs on the Reflex according to the ChipStudio diagram. You can assign any others.
Download ChipStudio software, unpack it on your PC. Open the combo project in ChipStudio. Put jumper 12 on Reflex, connect Reflex to the PC, load the combo project into it, remove jumper 12 and everything works for you.
The connection block diagram is as follows:
Please pay attention to the installation of jumpers.
I have a front panel from a DSP Machine.
SigmaStudio Projects
Combo project for ChipStudio
Firmware for Reflex
KiCad project
ChipStudio soft
For now, you can order boards from the KiCad project and make PCBs with adau1701 and Reflex yourself. They are very simple.
I will answer any questions.
Follow the headlines ChipDipDAC did it, so can you. I will show examples of how to do it.
The next project is DSP Machine 3. Hi-Res Streamer (ADAU1452+AD1934) for Raspberry Pi (driver & overlay ChipDip DAC)
Enjoy!
Last edited:
