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USB 8bit Interface Board
Posted on Monday, November 10, 2008   •   Category: USB Circuts


This is a USB (universal serial bus ) interface board which can be used to connect 8 (parallel) data lines to the USB. The interface comes with a small internal FIFO (384 byte Tx, 128 bytes Rx) and 4 handshake lines which make it suitable for interfacing microcontroller designs to the USB. It can, also be used as simple 8bit IO when the so-called “bitbang mode” is enabled. Note. however, that in this mode, the bits will not come out in a constant bitrate but in chunks of 64 bytes with specified baud rate followed by a delay.


PWM Motor Driver with H-Bridge
Posted on Monday, November 10, 2008   •   Category: Motor Controllers


This pulse wide modulated driver is designed for DC Motors with a maximal power consumption of 200 watts. It works with a so called H -Bridge. It has three input pins, two for the direction and one for the pwm-signal. The inputs are designed for logic level signals ecpecially for microcontroller outputs.


USB Audio DAC
Posted on Sunday, November 9, 2008   •   Category: USB Soundcards / USB Headphones


I want to build high quality preamplifier with built-in DAC from SPDIF or USB for my power amplifier Leachamp. I had available circuit PCM2902. I tried to design DAC from USB with this circuit on one-sided PCB and I was successful.


Compact Fluorescent Lamp (CFL) Schematics
Posted on Sunday, November 9, 2008   •   Category: Fluorescent Lamps


Compact fluorescent lamps have some benefits in comparison with classic light bulbs. It is lower power consumption (to 80%) and much longer lifetime (5 to 15 times). Disadvantages are longer starts mainly at more expensive types, impossibility to use darker and price.


The Leach 200W Amplifier
Posted on Sunday, November 9, 2008   •   Category: Amplifiers


This article descripts, how I built amplifier from Mr. Marshall Leach known like "The Leach Amp". I built amplifier from the original instructions on these pages: http://users.ece.gatech.edu/~mleach/lowtim/. Article about bulding of this amplifier I found later in journal A_Radio Praktická elektronika 11/2002. For many years I looked for construction of HiFi amplifier wit a good parameters, enough power reserve and simple construction. I built a couple of amplifiers with integrated circuits MBA810, TDA2005, LM3886, but I was disappointed by their output quality and noise. I decide to built a classic construction with discrete components and bipolar transistors. Construction from Mr. Dudek was interesting, but I didn't like used components and complexity. All of my requirements satisfied construction of the Leach Amp. Circuit author publicates in a February 1976 in american journal. From these days circuit was not practically changed. Little changes are descripted on authors page.


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