Schematic dsPIC MiniTron Amplifier

The MiniTron is a high end vacuum tube stereo amplifier with efficiency, distortion, and power output enhancements provided by some unique circuitry featuring a dsPIC30F2023 controller IC. The dsPIC is used in this project to create a tracking buck converter whose output voltage tracks the audio signal. The unique SMPS resources in these...

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Schematic dsPIC 33F128MC706 NUE-PSK Digital Modem

PSK31 is one of the latest communications modes to capture the interest of hams worldwide. Its inherent ability to dig out low, near-inaudible signals is ideally suited for low power QRP enthusiasts. The PSK31 digital modem engine, however, requires intense DSP processing that is only commonly available in PC sound card. Thus the PSK operator...

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Schematic H-1B or Outsourcing?

H-1B is non-immigrant visa in US under the immigration & nationality act that allows U.S. employers to temporarily employ foreign workers that has specialized knowledge needed by US employer. Usually many foreign IT worker that apply for this kind of visa. Discussing about H-1B visa for IT worker there are pros and cons about this policies. The pro said that hiring H-1B professionals allow U.S companies to maintaining the...

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Control :: The Circuits and Boards

In the following pictures are the PLC circuit schemes and the circuit boards in PCB.Click them to enlarge: -> Virtual PLC Scheme ------------------------------------ -> Virtual PLC PCB MainBoard (two sides)-------------------------------------------------- -> Virtual PLC Output...

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Control :: Project Study

Is described below in more detail the operation of each of the PCB boards that form the virtual PLC and the principle of operation of each of the main components.Main BoardThe main board is controlled by PC through the RS232 serial port through which receives the clock and control signals in addition sending and receiving data from the respective inputs and outputs in serie format.This board contains 4 integrated 4021, connected...

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Control :: Objective

The objective of this project is the completion of a virtual PLC.After some research i chose a circuit witch i found in the magazine elektor No. 204, which also contained links to the page of the author, on the Internet, where I found more information and references to the same assembly.The referenced assembly, which i called virtual PLC, is a PLC implemented in two parts;1) One part of Hardware, consists in 3 PCB boards:The main...

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Schematic PIC Wireless Networks Wifi (Hotspot) Detector

This wireless detector project allows you to sense the presence and relative signal strength of wireless hotspots. It is "always on" and communicates the presence and signal strength of an in-range hotspot by way of sequences of pulses - like a heartbeat you can feel. The stronger and faster the "heartbeat", the stronger the wireless signal...

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Control :: What's Virtual PLC?

The commons PLC's (Programmable Logic Controllers) are micro controller circuits boards used for automation of industrial process...

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Schematic AVR Digital Clock with Roman Numerals

This digital clock project will display a Roman number instead Hindu-Arabic numeral system (1,2,3... ). The project uses micro ATTINY2313 as main processor and LCD to display the clock. When you turn on the device, it will shows a screen flashes "Tempera tempus" as reminder to adjust the time. The adjustment is done via the small button.Press...

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