IC Blog Center
Index 52
Voltage regulator calculation
Published:2011/8/17 1:51:00 Author:Amy
Victor Himpe Before you con design on adjustable voltage regulator into your circuit, or do a redesign, you need to calculate the values for two resistors. This is not difficult in itself, but actually finding the right resistors may po... (View)
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Power Supply Design: Information, dimensioning and simulation
Published:2011/8/17 1:44:00 Author:Li xiao na
Harry Baggen ＆ Karel Walraven Designing a power supply for one of your circuits can be plain sailing but also turn out to be a surprisingly complex job. Switch-mode power supplies in particular may present a real challenge before useful results are obtained. Fortunately, several semiconductor manufacturers come to our rescue. (View)
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Continuous Flow Soldering
Published:2011/8/17 1:35:00 Author:Amy
From reader correspondence we know that lots of you are still hesitant about soldering SMDs (surface-mount devices), particularly integrated circuits. We won’t say it’s a piece of cake, but maintain that there’s no reason to start panicking about SMDs, as accurate soldering does the trick. Using the right tools and some ba... (View)
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Delphi for electronic engineers: Part1-the first steps （4）
Published:2011/8/17 1:13:00 Author:Li xiao na
Detlef Overbeek ＆ Anton Vogelaar The third program -an alarm system This program provides protection against burglary and fire in a dwelling. The protected dwelling is divided into four zones. If there is an alarm condition in one or more zones this should be indicated both visually and aurally. The alarm system is implemented as follows. Each zone contains a number of sensors with norma... (View)
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Heathkit TC-2P Tube Checker
Published:2011/8/17 1:04:00 Author:Amy
Jan Buiting I came across this gem in an unexpected place, namely a flea market for vintage motorcycle parts! Standing between heaps of pistons, wheels and engine parts, the owner claimed it was some kind of electrical instrument capable of testing well, a lot of things I guess . When the small case was opened I immediately recognized a Heathkit lube tester that had definitely ... (View)
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DELPHI FOR ELECTRONIC ENGINEERS Part 3- An external calculator （3）
Published:2011/8/16 22:51:00 Author:Phyllis
By Herman Bulle Combining the routines In principle that is all there is to do: we know how to select a column and how to read on which row a key is pressed. However, these functions still have to be ’glued together’ and the result has to be shown on the display. This takes place as follows: a timer is used to call the function GetKey at regular intervals. This call... (View)
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DELPHI FOR ELECTRONIC ENGINEERS Part 3- An external calculator （2）
Published:2011/8/16 22:30:00 Author:Phyllis
By Herman Bulle Software switching To drive the DTR and RTS lines we’ll have to write a bit of Delphi code. To start with, we have to open the serial port. We have already covered this in Part 1 for the burglar alarm: FHandle: = CreateFile (PChar(port), Generic_Read+ Generic+Write, 0, Ni... (View)
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DELPHI FOR ELECTRONIC ENGINEERS Part 3- An external calculator （1）
Published:2011/8/16 22:16:00 Author:Phyllis
By Herman Bulle In the previous article we saw how we could implement a simple calculator using Delphi. This time we connect an external keypad to the serial port, to allow the calculator to be controlled externally. We’ll use the program from the last article (slightly modified) to put the numbers onto the display and to perform the calculations. The external keypad, which we’ll bu... (View)
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LPC210x ＇ARMEE＇ DEVELOPMENT BOARD Part 1: an ARM processor survey （2）
Published:2011/8/16 21:51:00 Author:Phyllis
By Tony Dixon All three controller chips are based on a common system architecture approach which offers the same memory map, vectored interrupt controller and similar peripheral complements. Also common to them are the same Flash programming and updating mechanism, JTAG debugging and emulation facilities. These devices operate from 1.8 V for the core CPU functions and 3.3 V for the... (View)
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LPC210x ＇ARMEE＇ DEVELOPMENT BOARD Part 1: an ARM processor survey （3）
Published:2011/8/16 21:40:00 Author:Phyllis
By Tony Dixon Overview of the ARM7TDMI core The ARM7 core is a 32-bit Reduced Instruction Set Computer (RISC). It uses a single 32-bit bus for instruction and data. The length of the data can be 8, 16 or 32 bits and the length of the instruction word is 32 bits.
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LPC210x ＇ARMEE＇ DEVELOPMENT BOARD Part 1: an ARM processor survey （1）
Published:2011/8/16 21:14:00 Author:Phyllis
By Tony Dixon In the first installment of a three-part article we will look at recent developments in 32-bit ARM based microcontrollers, concentrating on those devices that are available, do not cost an arm and a leg or require a major investment in surface mount soldering equipment! ARM stands for Advanced RISC Machine, where RISC means Reduced Instruction Set Computer. The ARM 32-... (View)
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I²C-homebus: Switch power outlets with your PC 2
Published:2011/8/16 6:14:00 Author:Amy
Paul Goossens Construction The printed circuit board designed for the circuit (Figure 2) has a spacious layout with all connectors carrying mains voltages conveniently located at one side. Mounting the components onto the board is not expected to cause problems. However, do pay attention to the orientation of polarized components like electrolytic capacitors, LEDs and ICs.
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I²C-homebus: Switch power outlets with your PC 1
Published:2011/8/16 3:20:00 Author:Amy
Paul Goossens This unit, in combination with the USB/I2C interface described elsewhere in this issue, may be used to switch four mains-powered devices on and off via the PC. Eight of these modules may be connected to a single interface, allowing up to 32 loads to be controlled. The system is ideal for a small home bus! Triggered by other articles on home automation in this issue, yo... (View)
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READY, STEADY, Fatty-Body Fat Monitor Scales （2）
Published:2011/8/16 2:23:00 Author:Phyllis
By David Daamen Operation BIA is based on the difference in conductivity between fatty and lean tissue in the body. A constant alternating current is fed through the body via two electrodes, with one placed underneath each foot. Typical values are about 800 uA and 50 kHz. The resulting voltage is measured using two different electrodes, also placed underneath the feet (Figur... (View)
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Delphi for electronic engineers: Part1-the first steps （3）
Published:2011/8/16 2:18:00 Author:Li xiao na
Detlef Overbeek ＆ Anton Vogelaar Second program - a digital clock The next example shows how we can create a program to display a digital clock, using Delphi. We’ll assume that you are now familiar with all the proc... (View)
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READY, STEADY, Fatty-Body Fat Monitor Scales （1）
Published:2011/8/16 2:15:00 Author:Phyllis
By David Daamen iSensible people look after their health: no smoking, moderate drinking, regular exercise and a healthy diet. And of course you want to keep an eye on your condition, for example with scales that also show your body fat percentage. Perhaps you already have one of these at home, but how do they work? It wasn’t that long ago when the body weight was the most important ... (View)
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REMOTE TEMPERATURE LOGGER FOR PIC 18F BOARD
Published:2011/8/16 2:03:00 Author:Phyllis
Using a DS 1820 1-wire temperature sensor By Peter Moreton In this short article, we describe how to bit-bang a DSl8B20 or DSl8S20 temperature sensor device using PIC firmware written in ’C, and output the temperature values to the RS232 port, for logging on a PC, all using the PIC1 8Flash Development Board published last month. The PIC18Flash development board described in ... (View)
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Delphi for electronic engineers: Part1-the first steps （2）
Published:2011/8/16 1:45:00 Author:Li xiao na
Detlef Overbeek ＆ Anton Vogelaar Altering the settings The possibility of losing programs can be much reduced by altering o few settings within ihe IDE. From the menu click on Tools/Environment Options. In the Autosave options tick Editor files and Project desktop. The Delphi settings are then stored when you exit. When Delphi is started again, the IDE will look exactly the ... (View)
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Introduction to dsPICs’ system
Published:2011/8/16 0:41:00 Author:Li xiao na
A range of 19 new tools and application aids is developed by Microchip, which is used to expand development for the dsPIC® 16-bit Digital Signal Controller (DSC) architecture. These new tools and application aid will give the designers th... (View)
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EL156 AUDIO POWER AMPLIFIER Return of a legend （4）
Published:2011/8/15 22:42:00 Author:Phyllis
By Gerhard Haas Switching off When the amplifier is turned off, there is no longer any voltage present on the transformer. The transformer voltage is monitored continuously by D5 and D6 (13 V operation) or by D5 and D7 (6.3 V operation). If the voltage is not present, the relay drops out immediately. Diodes D... (View)
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