Read the Docs Template Documentation, Release
development board adds a set of LC circuits at the front of the PA power supply, where L uses 1.5A magnetic beads
and C uses 10uF aluminum electrolytic capacitors, to effectively filter out power crosstalk.
Fig. 3.9: ESP32 LyraT V4.3 - Power Supply for the PAs
Selecting of the Audio Output
The development board uses two mono Class D amplifier ICs, model number NS4150 with maximum output power
of 3W and operating voltage from 3.0V to 5.25V.
The audio input source is the digital-to-analog converter (DAC) output of the ES8388. Audio output supports two
external speakers.
An optional audio output is a pair of headphones feed from the same DACs as the amplifier ICs.
To switch between using headphones and speakers, the board provides a digital input signal to detect when a head-
phone jack is inserted and a digital output signal to enable or disable the amplifier ICs. In other words selection
between speakers and headphones is under software control instead of using mechanical contacts that would discon-
nect speakers once a headphone jack is inserted.
Other Versions of LyraT
•
ESP32-LyraT V4.2 Getting Started Guide
•
ESP32-LyraT V4 Getting Started Guide
Related Documents
•
(PDF)
•
ESP32-LyraT V4.3 Getting Started Guide
•
(PDF)
3.4. Development Boards
85
Содержание ESP32-LyraT
Страница 1: ...Read the Docs Template Documentation Release Read the Docs Jul 01 2018...
Страница 2: ......
Страница 4: ...ii...
Страница 6: ...Read the Docs Template Documentation Release 2 Contents...
Страница 82: ...Read the Docs Template Documentation Release Fig 3 5 ESP32 LyraT V4 3 Board Layout 78 Chapter 3 Design Guide...
Страница 92: ...Read the Docs Template Documentation Release 88 Chapter 4 Resources...
Страница 94: ...Read the Docs Template Documentation Release 90 Chapter 5 Copyrights and Licenses...
Страница 96: ...Read the Docs Template Documentation Release Fig 6 1 Espressif Audio Development Framework 92 Chapter 6 About...
