ATtiny controlled and LiPo battery powered MP3-Player using the DFPlayerMini-module featuring:
- Micro-SD-card slot,
- battery charging and protection circuit,
- battery level detection,
- OLED display,
- on/off switch,
- volume control,
- 3 push buttons to control the player.
You can directly connect a 3.7V LiPo battery and a 3W/4Ohm speaker to the board.
The firmware is written for the folder-p...
ATtiny85 controlled FM radio with RDS (RDA5807) and integrated audio amplifier (XPT8871). You can directly connect a protected li-ion battery, a 3 W / 4 Ohm speaker and an FM antenna.
Project Video: https://youtu.be/dG5VVQmySEc
***SONICA 1 - Headphone Amplifier with TPA6120***
Sonica 1 is a rebirth of an older design of mine. A few years back I designed a small PCB for a headphone amplifier, based on BurrBrown (TI)TPA6120A2 chip amplifier. I made a power supply on a piece of test PCB with a toroidal transformer. The end result was quite pleasing and I have used it since then as my main source for music at home, whenever...
A compact USB powered audio player module with up 32GB capacity using removable Micro SD cards. Quickly update audio content using drag and drop interface, since the module acts like an external USB drive when connected to a computer. Available in two different models, hands free or button switch, to control audio play. Multiple applications are possible, ie. Clean Hands Audio Player, Button Audio...
A CS42448 multi-channel audio codec breakout board for the Teensy 3.5/3.6
*note* This PCB does not provide any analog filtering or biasing for the input and output signals and must be done externally. Please refer to the CS42448 data sheet for more info.
This board breaks out the 6 input and 8 output differential audio signal pairs of the CS42448. The digital signaling (TDM) and control (I2C) a...
work in progress and by no means "production ready"
proceed with caution until it is production ready.
arduino controlled VCO VCF and VCA.
Uses Digital Potentiometers controlled by an MCU through
an I2C Expander.
Please see readme.txt in attachments.
Modern earphones are not just (stereo) speakers, but they integrate a microphone and few buttons. All these components are available through a 4-pins 3.5mm plug (also known as TRRS). This schematic shows you how the microphone and buttons are connected through this connector. The common purpose of these buttons is music control, but in general, their behavior depends on the specific application. F...