Analog | Embedded Lab

Category Archives: Analog

Enhancing audio with echo effect

Posted on October 29, 2014 by R-B Leave a comment

Delay effects are commonly implemented in various audio systems including Karaoke player, guitar amplifier, advanced sound processing equipment, recording studios, television etc. It basically adds an echo to the original audio by repeating the audio after a specified amount of time. Rajkumar Sharma’s new project is about building an echo generator using Holtek’s HT8970 IC, which is an echo/surround effect processor with built-in pre-amplifier, VCO, 20Kb SRAM, A/D and D/A converters as well as delay time control logic. With all these functions built inside the chip, you can easily enhance your audio with an echo effect using a minimal number of external components.

3-D printed walking robot

Posted on October 24, 2014 by R-B Leave a comment

One of the most interesting applications of 3-D printing technology is building customized robot parts. It allows makers to design their own parts on a computer using affordable tools and convert the design into an actual physical product in just a few hours. Randy’s 3-D printed walking robot is a great example of 3-D printing robot parts for rapid prototyping and implementation of your ideas. The robot uses two standard servos for locomotion and are controlled by Arduino. The author also shares his 3-D printer design files and Arduino sketch to the public.

Adding Bluetooth streaming to your old audio cassette player

Posted on October 11, 2014 by R-B Leave a comment

With the advent of new audio technologies like CDs, Ipods and MP3 players, all of those old-fashioned cassette players and amplifiers have disappeared today. One of the many features missing on those old devices is wireless music streaming. This Bluetooth Ghettoblaster project by tomatoskins describes how to convert an old-time cassette player into a wireless streaming machine.

Digital voice recorder design using C8051F411

Posted on October 10, 2014 by R-B Leave a comment

Designing a digital voice recorder requires sampling the audio channel, compress and decompress the signal, and store and retrieve the samples. Silicon Labs provides a reference for designing a digital voice recorder using their C8051F411 microcontroller, which has a 12-bit ADC, and a 12-bit DAC, available on chip. The ‘F411 samples the voice signal using the ADC, compresses the sample using DPCM (Differential Pulse Code Modulation), and sends the sample to the external Flash using the SPI. Later, the microcontroller retrieves the samples from the external Flash, decompresses them, and sends them to the speaker through the DAC. This reference design can record up to 87

Mechanical drawbot using four-bar linkage mechanism

Posted on October 5, 2014 by R-B Leave a comment

Drawbots are a lot of fun to build. Here is an Instructable for building a mechanical artbot using a basic circuit involving a battery and a DC motor. The project uses a four-bar linkage mechanism added to the motor to change its motion in a special way to create some fun arts.

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