Tag Archives: Audio

LM386 SMD Audio Amplifier Module


The Tiny Audio Amplifier MODULE is a good choice for battery operation. It is based on LM386 IC, useful in various applications like robotics, science projects, intercom, FM radio and many more.


  • Power Supply 6V-9V
  • 300mW Output @ 8Ohms Load
  • On Board Potentiometer for Audio Level Adjust
  • Header Connecter for Supply, Signal in and Speaker
  • On Board Power LED
  • Input: Standard Audio Signal

LM386 SMD Audio Amplifier Module – [Link]

ATiny does 170×240 VGA with 8 Colors


AtomicZombie @ avrfreaks.net used an ATtiny85 ATMEL microcontroller to produce a 170×240 VGA signal and also send audio along with video.

The original plan was to just bit bang some mono VGA and do up a Pong or Tetris game, but things went MUCH MUCH further than I ever thought possible, so over the next few weeks I will detail this fun project here. I call it The QUARK-85 VGA DEMO System.

So what can one do with an ATTINY-85 and no other external components, an 8 pin package that leaves ONLY 4 IO lines after you feed it a clock??

How about 4 color rock solid VGA with stereo sound!!!

ATiny does 170×240 VGA with 8 Colors – [Link]

Light To Audio Oscillator


Light Sensitive Audio Oscillator project is a fun loving project which will create different sound effects depending on the light falling on the sensor


  • Supply input 5 ~ 12 VDC
  • Output 8 Ohms, 0.5 W Speaker
  • Terminal pins for supply voltage and speaker connection
  • Power-On LED indicator
  • PCB dimensions 38 mm x 44 mm

Light To Audio Oscillator – [Link]

1.6W Mono Audio Amplifier


1.6W Mono Audio Amplifier Project is based on TDA7231, which is class AB power amplifier with a wide range of supply.

  • Power supply: 5 To 12 VDC
  • Output: 1.6 W, 4 Ω / 1 W, 8 Ω
  • Low crossover distortion, soft clipping
  • PR1 Preset for Volume Adjust
  • Terminal pins for connecting power supply, input and output
  • Power On/OFF Switch
  • Power-On LED indicator
  • Four mounting holes of 3.2 mm each
  • PCB dimensions 36 mm x 52 mm

1.6W Mono Audio Amplifier – [Link]

Sinewave Generator


Sine wave Generator project will provide you with a Sinusoidal Waveform output to test various instruments.  You can also use the High quality output from this kit to insert a tone modulation in your audio and RF equipment.  This kit is designed using XR2206 IC to provide High Stability and Accuracy.

  • Supply input 12 VDC Max @ 50 mA
  •  Range: Jumper selectable and preset tunable range of 10 Hz – 100 KHz
  •  Output Level can be controller with onboard preset
  •  Power-On LED indicator
  •  Screw terminal connector for easy connection
  •  PCB dimensions 55 mm x 50 mm

Sinewave Generator – [Link]

Generation of Sound Using Microcontroller

This project illustrates the use of a microcontroller(MCU) to generate different types of sound. The device uses SST89E54RDA-40-C-PIEMCU, an 8-bit 8051-compatible MCU with embedded SuperFlash memory.The device comes with 24/40KByte of on-chip flash EEPROM program memory which is partitioned into two independent program memory blocks. The primary block 0 occupies 16/32KByte of internal program memory space while the secondary block 1 occupies 8KByte of internal program memory space.

Sound is a function of frequency. This concept has been used to generate sound from the microcontroller. Varying the frequency can produce different types of sounds especially with the use of timer 1 of the MCU to produce different frequencies. Timer is used to produce exact delays and by toggling the output pin, it will generate the desired frequencies. These frequencies are then fed to pin 0 of port 1 which is connected to the speaker. By combining frequencies of different values, different tones will be produced.

The circuit is a basic sound generator that has wide applications such as used in cars that produce sound while reversing. In addition, it supports electronic piano to generate different tones, or in electronic toys to generate sounds. Thus, this device is an effective sound generator that produces an audible sound as preferred by the user.

Generation of Sound Using Microcontroller – [Link]

GPiO Audio Measurement Toolbox


by Sagar Savant:

Measuring performance of audio components like microphones, speakers, converters, and amplifiers can be a difficult task. In this post, I’ll talk about some of the tools I use to make this job easier. Analyzers, reference transducers, calibrators, meters, and more come with various feature sets and price tags. The items below just happen to be my favorites.

Soundcheck (Listen Inc.): Soundcheck is a versatile audio analyzer that I’ve used for years in both R&D and production line environments. It’s built in a “modular” way, so you buy the features that you need. What I love about this software is the customization potential in everything from the granularity of frequency points in a sine sweep to the ability to post process measurements in a sequence automatically based on macros. Soundcheck is not cheap, but it saves me tons of time when I need to measure and report on audio components or subsystems.

GPiO Audio Measurement Toolbox – [Link]

6EM7 Single-Ended Triode (SET) Vertical Amplifier


by Matt Renaud:

What really drove me to build this 6EM7 amp was an idea about amplifier layout. Looking back at most of my tube designs, and most of those on the internet, revealed a very typical pattern. Amplifiers tended to be flat chassis with tubes and transformers above and electronics below. From a historical perspective this makes perfect sense. Metal chassis were built this way to facilitate packaging and assembly. When people started to make tube amplifiers again, they just removed the upper case and built in the same way.

6EM7 Single-Ended Triode (SET) Vertical Amplifier – [Link]

Tiny audio amp produces 1.9 W from 5 V


by elektormagazine.com:

The PAM8905 is a new audio amp chip from Diodes Incorporated measuring just 1.5 x 2.0 mm. The design operates in class D mode, achieving a total harmonic distortion of 1% (plus noise) and delivering a maximum of 1.9 W into 8 ohm using a power supply in the range between 2.8 V to 5.2 V. The PAM8905 features an integrated boost converter powering the output stage to achieve the rated output power and maintaining volume with falling battery voltage. The boost converter is a fully synchronous design, ensuring a low external component count and high efficiency.

Tiny audio amp produces 1.9 W from 5 V – [Link]

3D Spectrum Analyser

by Dooievriend @ tweakblog.tweakblogs.net:

More than a year ago, a friend of mine asked me to write the software for his 3D Spectrum Analyser (3DSA): a device that takes as input an audio signal, and outputs its visualisation on a 3D matrix of leds. If the above description doesn’t quite ring a bell, simply watch the end result in action.

First things first though, the microprocessor to be programmed was an 80MHz Olimex PIC32, soldered to the PIC32-PINGUINO-OTG development board. (For those who ever tinkered with Arduino boards: it’s the same, only with a faster chip and fewer builtin libraries ) The Algorithm had to sample the input signal at regular time intervals, convert this signal to the frequency domain, and visualize the detected frequencies on a 16x16x5 LED matrix.

3D Spectrum Analyser – [Link]