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| Series Protection Against High Voltage Transients | | 2008-08-22 13:27:49 | | Description: In many low-voltage applications, undesired voltage overshoots may occur at the input during the circuit operation. To avoid the harm of this overvoltage, we generally use parallel clamps such as fuses or other current limiting devices. The disadvantage of the parallel protection may be resetting or renewing the protector component. This circuit provides a series protection that turns off the power switch using a series connected high voltage MOSFET (n-channel – Q1) power switch and a fast overvoltage detector IC, MAX1614. The series connected rectifier diode D1 and the power switch is together capable of protecting the load up to +/- 500V of either polarity. | | By: born4electronics1 | | |
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| Outdoor Wall Lanterns - Using Low-Voltage Lighting | | 2008-08-04 00:00:00 | | When people are buying their house, one of the first things they notice is the curb appeal of the house. Curb appeal is defined as the way a house looks as soon as they get out of the car. The same thing holds true for visitors to your backyard. The way you have designed the [...] | | By: Resources Zone | | |
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| Job vacancies Product Manager, Low Voltage - ABB Industry Pte Ltd | | 2008-06-10 09:20:00 | | Job Vacancies :
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The ABB Group of companies operates in around 100 countries and employs about 110,000 people.
Product...
ASIAN JOBS Job Vacancy Information in s'pore, malaysia, india, and more country in asia. This Site collecting many job information opportunities, wherever they came from and Its contents covered : | | By: Asian Jobs | | |
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| Why DC voltage? | | 2008-05-17 16:44:36 | | Dear friends,
One easy question for you.
In hydraulics systems for solenoid valves, PLC inputs/outputs and in many other circuits, for conrol voltage, Why DC voltage(12v,24v) is used? What are problems for use of AC?
Thanks in advance.. | | By: CR4: The Engineer's Place for Discussion & New | | |
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| High voltage ohmmeters | | 2008-05-10 04:45:48 | | Most ohmmeters of the design shown in the previous section utilize a battery of relatively low voltage, usually nine volts or less. This is perfectly adequate for measuring resistances under several mega-ohms (MΩ), but when extremely high resistances need to be measured, a 9 volt battery is insufficient for generating enough current to actuate an electromechanical meter movement. Also, as discussed in an earlier chapter, resistance is not always a stable (linear) quantity. This is especially true of non-metals. Recall the graph of current over voltage for a small air gap (less than an inch): While this is an extreme example of nonlinear conduction, other substances exhibit similar insulating/conducting properties when exposed to high voltages. Obviously, an ohmmeter using a low-voltage battery as a source of power cannot measure resistance at the ionization potential of a gas, or at the breakdown voltage of an insulator. If such resistance values need to be measured, nothing | | By: All About Circuits | | |
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| Voltage references in embedded design | | 2008-05-08 16:21:17 | | Embedded systems that are dealing with DAC require a good voltage references. Despite all voltage references have their nominal values there are specific tolerances that indicates how much values can vary from nominal value. References as a rule are semiconductors that characteristics are effected by temperature.
For instance if we decide to use a 2.5V voltage [...] | | By: Scienceprog - Embedded Related Info | | |
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| Voltage-to-current signal conversion OPERATIONAL AMPLIFIERS | | 2008-05-08 06:16:16 | | In instrumentation circuitry, DC signals are often used as analog representations of physical measurements such as temperature, pressure, flow, weight, and motion. Most commonly, DC current signals are used in preference to DC voltage signals, because current signals are exactly equal in magnitude throughout the series circuit loop carrying current from the source (measuring device) to the load (indicator, recorder, or controller), whereas voltage signals in a parallel circuit may vary from one end to the other due to resistive wire losses. Furthermore, current-sensing instruments typically have low impedances (while voltage-sensing instruments have high impedances), which gives current-sensing instruments greater electrical noise immunity. In order to use current as an analog representation of a physical quantity, we have to have some way of generating a precise amount of current within the signal circuit. But how do we generate a precise current signal when we might not know th | | By: Electronics Circuits And VLSI Engineering | | |
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| Diamond Power commences its trial production of high voltage power cables manufacturing | | 2008-05-02 05:43:00 | | Diamond Power Infrastructure is pleased to announced the commencement of trial production at its state of art high voltage power cables manufacturing facility set up at village Vadadala Ta Savli District Vadodara.The companies manufacturing facility which comprises of CCV process line, extrusion equipments, wiredrawing to conductors making facility is capable of making 2800 km of high tension power cables of voltage from 11KV to 132KV, the project has been set with an cost of rest 30 crore funded from internal accruals.The company has also added balancing equipment for laying and extrusion at its LT cables facility which has commenced production increasing its LT power cables capacity by 3500 kms per annum.The company is also implementing a LT cables expansion project costing Rs 38 crore which will add a capacity of 25,000 kms of LT cables power and control cables.The company made this announcement during the trading hours today, 02 May 2008. | | By: Indian stock markets | | |
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| Kirchhoff's Voltage Law (KVL) | | 2008-04-18 05:28:13 | | Let's take another look at our example series circuit, this time numbering the points in the circuit for voltage reference: If we were to connect a voltmeter between points 2 and 1, red test lead to point 2 and black test lead to point 1, the meter would register +45 volts. Typically the "+" sign is not shown, but rather implied, for positive readings in digital meter displays. However, for this lesson the polarity of the voltage reading is very important and so I will show positive numbers explicitly: When a voltage is specified with a double subscript (the characters "2-1" in the notation "E2-1"), it means the voltage at the first point (2) as measured in reference to the second point (1). A voltage specified as "Ecg" would mean the voltage as indicated by a digital meter with the red test lead on point "c" and the black test lead on point "g": the voltage at "c" in reference to "g". If we were to take that same voltmeter and measure the voltage drop across eac | | By: All About Circuits | | |
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| Voltage divider circuits | | 2008-04-18 05:27:22 | | Let's analyze a simple series circuit, determining the voltage drops across individual resistors: From the given values of individual resistances, we can determine a total circuit resistance, knowing that resistances add in series: From here, we can use Ohm's Law (I=E/R) to determine the total current, which we know will be the same as each resistor current, currents being equal in all parts of a series circuit: Now, knowing that the circuit current is 2 mA, we can use Ohm's Law (E=IR) to calculate voltage across each resistor: It should be apparent that the voltage drop across each resistor is proportional to its resistance, given that the current is the same through all resistors. Notice how the voltage across R2 is double that of the voltage across R1, just as the resistance of R2 is double that of R1. If we were to change the total voltage, we would find this proportionality of voltage drops remains constant: The voltage across R | | By: All About Circuits | | |
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| Planning For Low Voltage Garden Lighting | | 2008-03-30 11:54:58 | | With recent quality improvements in low voltage outdoor lighting system components it is now easier than ever to set up your own garden or walkway lighting system. With the right components and setup you can save by doing it yourself and still get a quality long lasting lighting system.You will need four basic components for the lighting setup; a transformer, the cables, the fixtures for the lamps and the lamps themselves. You can purchase the items separately but it is also very common to find kits available at your local hardware store that have all the items you need included.The transformer for these lighting systems converts standard 120 volt house current to a more manageable 12 to 22 volts. You will want to mount it in a safe out of the way location like a garage or tool shed that has a standard grounded 120 volt electrical outlet you can dedicate to the lighting system. Lighting transformers come in a variety of sizes and you will need one big enough to handle the number and wa | | By: Home and Garden - Information on Gardening, Garden | | |
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| Linkin Park - High Voltage Mp3 | | 2008-03-27 06:48:00 | | Download Free Mp3 Linkin Park - High Voltage Mp3 source 1 >Artist: Linkin ParkGenre: New Metal, RockMusic blast is your source for legal and free MP3 downloads. Download MP3s from thousands of artists.mp3, mp3s, music, free mp3, mp3 music, free music, download mp3, download, free music downloads, mp3 downloads, legal mp3 downloads, song, band, artist, digital music, electronica, jazz, rock, rock and roll, alternative, country, country music, pop, pop music, adult contemporary, techno, disco, rap, rap music, hip hop, funk, soul, r n b, rb, rhythm and blues.Enjoy :)
| | By: Free Music | | |
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| Laboratory Power Supply Variable Voltage 0-50V 1A | | 2008-03-27 00:55:59 | | Laboratory Power Supply - Variable voltage from 0V to 50V and variable current from 0A to 1A
Reverse engineered circuit diagram of an expensive commercial variable lab power supply. This unit is designed around an ordinary op-amp and easy to obtain parts. Although the unit uses a single transformer with two output windings the circuit works [...] | | By: Circuit Project Electronic | | |
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| Voltage Level Indicator | | 2008-03-26 00:22:15 | | This circuit is derived from a Siemens Application Note 1974. This circuit uses common components of today. The circuit is here as it is of high educational value. I have not tested it. You can ’simulate and test’ or ‘wire it up and try’ and let me know how it worked. The Circuit is also [...] | | By: Circuit Project Electronic | | |
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| Voltage Monolithic Switcher | | 2008-03-14 21:35:06 | | A 4V-60V to 5V DC/DC converter is shown in Figure 2. This converter is well suited for 12V automotive battery applications, maintaining output voltage regulation with battery line voltages from 4V cold crank through 60V load dump. The threshold for bridged mode operation is about 8V, so the converter will operate primarily in buck mode [...] | | By: Circuit Project Electronic | | |
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| High Voltage Protector for Meters by CA3130 | | 2008-03-11 22:09:32 | | Normally, in a digital voltmeter, high input impedance of the preamplifier stage is protected against very high voltages by two diodes. One of them is connected to the positive terminal and the other one is connected to the negative terminal of the power supply. Practically this kind of protection is very sufficient. But the diodes [...] | | By: Circuit Project Electronic | | |
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| Voltage regulator | | 2008-03-10 00:39:13 | | is an electrical regulator designed to automatically maintain a constant voltage level.It may use an electromechanical mechanism, or passive or active electronic components. Depending on the design, it may be used to regulate one or more AC or DC voltages.With the exception of shunt regulators, all modern electronic voltage regulators operate by comparing the actual output voltage to some internal fixed reference voltage. Any difference is amplified and used to control the regulation element. This forms a negative feedback servo control loop. If the output voltage is too low, the regulation element is commanded to produce a higher voltage. For some regulators if the output voltage is too high, the regulation element is commanded to produce a lower voltage; however, many just stop sourcing current and depend on the current draw of whatever it is driving to pull the voltage back down. In this way, the output voltage is held roughly constant. The control loop must be carefully designed to | | By: Free Download Books | | |
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| 12V Switching Regulator Boosts Input Voltage | | 2008-02-29 13:10:42 | | In conventional applications, switching-regulator ICs regulate VOUT by controlling the current through an external inductor. The IC in Figure 1, however, driving a diode-capacitor network in place of the inductor, offers comparable performance for small loads. Made of readily available components, the network can double, tripple or quadruple the input voltage. Though somewhat less efficient [...] | | By: Circuit Project Electronic | | |
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| Micropower Linear Voltage Regulators | | 2008-02-29 12:35:54 | | The ADM663A/ADM666A contains a micropower bandgap reference voltage source; an error amplifier, A1; three comparators, C1, C2, C3, and a series pass output transistor. A P-channel FET and an NPN transistor are used on the ADM663A while the ADM666A uses an NPN output transistor.
Source:
http://www.analog.com/UploadedFiles/
Application_Notes/66728469AN-392.pdf
dc voltage regulator, Power supply circuitShare This | | By: Circuit Project Electronic | | |
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| A flyback converter high voltage supply by 555 | | 2008-02-27 21:43:03 | | The circuit diagram of the flyback converter will hold no surprises (Fig.16). Literally the only difference with the boost converter is that the inductor is replaced by a transformer, and that the transistor has been replaced for a BUZ21. The BUZ21 has a much lower on resistance (Ron=0.085 ohm) as compared to the BUZ41A (Ron=1.5 [...] | | By: Circuit Project Electronic | | |
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| 12VDC Negative Voltage DC Converter by 555 | | 2008-02-25 22:56:52 | | The circuit is very simple, and is easily made on Veroboard or similar. Construction is not critical, and the schematic is shown in Figure 1 below.
Rectifier diodes should be ultrafast (UF4004 or similar), or you can use 1N4148 signal diodes. Losses will be slightly higher if you use signal diodes, or lower if [...] | | By: Circuit Project Electronic | | |
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| 15V Reducing Voltage Regulator Noise | | 2008-02-23 21:14:38 | | The following circuit is designed for filtering 15 volt supplies like those typically found in instrumentation. The shunt will greatly reduce white noise, spurious signals, and line-related signals on the power supply; the attenuation can exceed 40 dB with careful construction. The values are not critical except that the gain of the amplifier should be [...] | | By: Circuit Project Electronic | | |
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| CAPS PROVIDE VOLTAGE BOOST TO SERIES REGULATOR | | 2008-02-18 02:02:26 | | This circuit adds some capacitors and diodes to a traditional transformer type series regulator circuit to extend the normal operating range. It can insure regulation during low line voltage conditions or it can squeeze a few more watts out of a plug-in-the-wall power adapter power supply.
Read More Source:
http://www.discovercircuits.com/DJ-Circuits/pwrboost.htm
Thank you.
High voltage power supply, Power supply [...] | | By: Circuit Project Electronic | | |
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| Hank Mobley - Hi Voltage - Jazz Music CD Review | | 2008-01-28 11:01:56 | | The exceptionally talented Jazz artist Hank Mobley has released him CD entitled Hi Voltage. I am very confident and happy to announce that I believe Hank Mobley fans, and Jazz fans alike will be pleased with this one. With the release of Hi Voltage Hank Mobley’s artistic excellence is on full display as Mobley has [...] | | By: Online Business Alliance & Niches | | |
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| High Voltage Switching for Energy Recovery for Xenon tube | | 2008-01-12 11:27:45 | | This is a High Voltage switching device for driving coils and which have big impedance when it is switched off. It can be use in Back-EMF energy recovery tests, Newman coils electronic commutator…..This device is drived by an opto-coupler and can be easily connected with an opto-switch for synchronisation phase (with plastic shutters) with a [...] | | By: Circuit Project Electronic | | |
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| Inductorless Switching Regulator Boosts Input Voltage | | 2007-12-19 01:54:58 | | Uses the MAX641 switching controller and an external discrete charge pump to step up the input voltage. This circuit can service low loads and is efficient when the output is two, three, four times the input voltage. Adding the MAX627 MOS driver can further increase the output current capability.
Read More Source:
http://www.maxim-ic.com/appnotes.cfm/appnote_number/5/ln/en
Thank you.
dc to dc converter [...] | | By: Circuit Project Electronic | | |
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| LM338 / LM350 / LM317 VOLTAGE REGULATOR CALCULATOR | | 2007-12-06 19:47:30 | | You can use this calculator to vary the value of the program resistor (R1) and output set resistor (R2) and calculate the output voltage for the LM317 / LM338 / LM350 family of three terminal adjustable regulators. This calculator will work for most voltage regulators with a reference voltage (VREF) of 1.25. Typically, the program [...] | | By: Circuit Project Electronic | | |
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| High Voltage Converter: 90 V from 1.5 V | | 2007-11-24 02:09:27 | | The circuit shows one way of obtaining a voltage of 90 V from a 1.5 V battery supply. The LT1073 switching regulator from Linear Technology (www.linear-tech.com) operates in boost mode and can work with an input voltage as low as 1.0 V. The switching transistor, which is hidden behind connections SW1 and SW2, briefly takes [...] | | By: Circuit Project Electronic | | |
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| Voltage Comparator | | 2007-11-21 22:19:52 | | In electronics, a comparator is a device which compares two voltages or currents and switches its output to indicate which is larger. More generally, the term is also used to refer to a device that compares two items of data. Output voltage will “switch” whenever the input voltage (at the inverting input) reaches the reference [...] | | By: Robotics Technology | | |
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| 0-1000V Regulated High Voltage Power Supply | | 2007-11-21 10:14:24 | | Another power supply that can be used for the Geiger-Müller tube variant of the cosmic ray muon detector.
If the specific transformer mentioned in the schematic is not available to you, any transformer with the specifications primary 117VAC, secondary 6.3VAC CT (center-tapped) should work.
In this case you might have to choose a different drive frequency in [...] | | By: Circuit Project Electronic | | |
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| Switching power supply dual voltage 5v and 3.3v by LM2575 LM1117 | | 2007-10-24 19:21:20 | | Here is circuit Switching power supply dual voltage, output 5V 1A and 3.3V 1A.
Use IC LM2575 SIMPLE SWITCHER 1A Step-Down Voltage Regulator ,and IC LM1117 is 800mA Low-Dropout Linear Regulator. Volt suppy 9V - 60V
Detail more see to image circuit.
Related Links
More circuit about switching power supply
13.8V 40A Switching Power Supply By LM3524,LM324
Switching [...] | | By: Circuit Project Electronic | | |
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| LM2577 5V to 12V DC Converter step up Voltage Regulator | | 2007-09-18 03:42:35 | | LM2577 (3A)
DC to DC step up voltage regulator.
Wide input voltage 3.5Vdc to 40Vdc.
This ic Circuit DC to DC Converter Step up Voltage Regulator From 5V To 12V 1A Regulated Output.
Component list
- 2.2kΩ 1/4W resistor
- 0.1uF capacitor
- 0.33uF capacitor
- 680uF 50V electrolytic capacitor
- 1N5822 high speed schottky diode (3A)
- wire coil inductor, 100uH
- “for LM2577-adj IC” [...] | | By: Circuit Project Electronic | | |
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| When To Use Neon, Fluorescent and Low Voltage Lighting | | 2007-05-29 01:38:00 | | By Lauren TylerTo fully understand how to make the most of your home lighting, using the correct indoor light fixtures for the different types of light requirements, (i.e. task lighting, accent and general lighting), it helps to understand the basic types of light being given out by each.Task lighting is that lighting which allows you to carry out your "tasks" around the house - for example, reading, knitting and playing the piano. All of these tasks require you to concentrate on the work at hand and in order to do this work you need good light. Task lighting is more often than not provided by fluorescent overhead lights and can be supplemented by other lamps, commonly adjustable table lamps which the worker can adjust to a more suitable angle. Adjustable lamps can be desk lamps, as well as floor lamps, or other portable lights that can be clipped onto shelves or other surfaces.Accent Lighting is lighting that is used to focus on an art object such as a painting or a sculpture, or any | | By: Interior and Exterior Your Home | | |
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