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Homebrew USB condensor mic inside an Altoids tin

Posted on May 27, 2014 by R-B Leave a comment

In this instructable, a 15 year old kid Angelo describes a homebrew USB condenser microphone for recording quality audio at home. His project uses an USB soundcard (DAC), a transistor preamp circuit, and two microphones, all enclosed inside an Altoids tin box. The resulting setup has cardioid pickup pattern, smooth frequency response and 16-bit output, and 44.1/48kHz resolution, which gives you professional audio results under the budget of $10.

Atmega64 Explorer Board

Posted on May 27, 2014 by R-B Leave a comment

Radek Malina from Czech Republic has designed this development board for rapid prototyping and firmware development with Atmel’s powerful Atmega64 microcontroller. He has also shared his design files here. The development board has the following features: – Atmega64 – all the ports available through pins, a different crystal can be connected (optional frequency crystal) – DS3231 RTC, real-time IC / I2C – Temp. DS1820 1wire Temp. sensor – EEPROM 24AA00SN / I2C EEPROM – USB Port FT232RL USB/RS232 converter – Buttons 8x -16x LED – Connect LCD Display 16×2 – 7segment-LED Display – N-FET For PWM – ISP Programming connector

Techniques of current sensing

Posted on May 21, 2014 by R-B Leave a comment

Current sensing is a fundamental requirement in many electronics applications. Linear Technology has this application note on collection of current sensing circuits that have been compiled from different other documents.

Switching regulators guide

Posted on May 21, 2014 by R-B Leave a comment

From Jim Williams’s application note on Switching Regulators for Poets:

Supercapacitors for reliable backup power in embedded systems

Posted on May 21, 2014 by R-B Leave a comment

From Samuel Nork’s article “Supercap backup circuit provides reliable uninterrupted power” Temporary backup power is a common requirement for a wide range of applications whenever the main power source is suddenly unavailable. Examples include data backup applications ranging from servers to solid-state drives, power fail alarms in industrial or medical applications, and a host of other “dying gasp” functions where orderly power-down must be assured and system status communicated to a powered host. In the past, these types of high reliability systems used batteries to provide an uninterrupted power source whenever the main supply of power was inadequate or unavailable.

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