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 is used, bringing it to a maximum of 25%. (more…)
This electronic project used to remote control and power on/off the PC. The extended guide for the infrared receiver with hardware side function to remotely switch the PC on and off as full USB variant is now available and got the name “USB Ultra infrared receiver” or briefly “USB Ultra IR”.
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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: (more…)
I think this is Cool idea related to Microcontroller project created by J. Lepot. This USB scope is based on a Atmel Tiny45 cpu and cost less than 5€ with a homemade pcb. It has 2 analog inputs and can supply 5V on the 4 pins header on the right. One of the inputs can be scaled down with the trim pot.
The firmware in the Tiny45 is written in C and compiled with Winavr and usb source code from obdev. (more…)
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