This is a simple and low cost desktop headphone amplifier for the office. The amplifier concept is simple and follows a typical single-ended class A circuit utilizing an active constant current source (CCS) in place of a passive resistor. A CCS doubles the efficiency of the circuit over that where a passive load resistor [...]
This circuit is for detecting any audio signal with justable noise offset. It could be used to generate a radio mute signal eg. from a PDA.
The circuit is consisting of:
I want to build high quality preamplifier with built-in DAC from SPDIF or USB for my power amplifier Leachamp. I tried to design DAC from USB with this circuit on one-sided PCB and I was successful.
Schematics is from datasheet of PCM2902. Circuit includes DAC and ADC, SPDIF output and input and HID part with [...]
Embedded C Programming and the Atmel AVR, 2E is the perfect choice embedded design reference. Featuring a host of fully-functional example applications, this highly innovative book enables users to adopt a "learn by doing" approach as they develop the knowledge and skills needed to achieve proficiency. Buy The Book
Electronic Design Europe provides leading edge technical information to electronic engineers and engineering managers in the European community - individuals responsible for design and development of electronic original equipment manufactures' products and systems. Get Electronic Design Magazine for free. 
Oracle Magazine contains technology strategy articles, sample code, tips, Oracle and partner news, how to articles for developers and DBAs, and more. Oracle (NASDAQ: ORCL) is the world's largest enterprise software company. Get it For free
