What is a Silicon controlled rectifier, how it works?
406671
It works similar to a typical diode, but is controlled similar to a bipolar transistor as far as connections go. Connection points are Anode [A], Cathode [K], and Gate [G]. Physical makeup: The SCR is made up of two "P-N" junctions with a "Gate" attachment between them (a normal diode [power type semiconductor diode] has one P-N junction). The gate is connected between the two P-N junctions with a current waiting in the forward bias direction [+ to -] and the voltage is above 1-volt. A momentary pulse to the gate will cause the SCR to conduct and current will flow across the device until the value changes. If this happens, the gate needs to be pulsed again to cause conduction to resume; otherwise no current will flow across the device. If used on AC, the device needs to be triggered [fired] in relationship to the points on the sine wave that conduction is requested. Example: to chop a wave to be 1/2 peak, the SCR gate will need to be pulsed with either a high-logic pulse or a positive-voltage pulse until the AC wave reaches 50% of peak value in the positive flowing direction.\n\nClick the link below for more info:
508404
Use a darlington array. They make them with 6 or more darlington transistors on a single chip. Some even have the circuit protection diodes built in. These are perfect for stepper motor control circuits. If you don't want to buy them, you can probably scavenge a couple from a dead printer or copier, if you can get one.\n\nOther than that, there is no best transistor. This is a general, low speed switching application, and almost any transistor that can handle 160mA at your circuit's voltage can be made to work with the proper biasing. But a single chip to replace several transistors and diodes will simplify your PCB.
229335
You can parallel the diodes to increase the current capacity of the recifier or add diodes in series to increase the voltage capacity of the rectifier.  If your looking to use diodes to drop  120v AC to 12V DC there are much easier was to do it.  The most common way would be to use a transformer to drop 120V AC to 12 - 16V AC and then use the recifier bridge to DC current.  Then place a large value capacitor in parallel with the DC output to filter the remaining pulses in the DC current.  Hope this helps!  If you have anymore questions drop me an e-mail.
57551
The increased reverse voltage increases the the amonut of energy imparted to minority carriers, as they diffuse accross the junction. As the reverse voltage is increased further,the minority carriers acquire a large amount of energy.when these carriers collide with silicon ( or germanium)atoms,  within the crystal struture, they impart sufficient energy to break a covalent bond and generate additional carriers(i.e., electron-hole pairs).As a result , the reverse current increase rapidly. This process of carrier generation is known as breakdown.\n\n i think u will understand from this
143229
odds are, that you would be beter off buying a manufactued device, dc to ac inverters are very complicated and have many different circuits. not only that, but for you to make something that can invert that much power would need an extreme amount of skill to to get the proper components. I would recomend geting a manufactured model from marine purposes perhaps. Some companies should offer custom built electronics.
120823
This is a 18-pin microcontroller to control the moving display in 7X60 matrix of LEDs. this is programable.\n\nyou can get more in formation from here. this is manual of this prodct..\n\nhttp://www.zilog.com/docs/z8/appnotes/an_msgdisp.pdf\n\nplease check
824800
You can use an integrated circuit, like LTC6906 from Linear Technology which goes up to 1MHz at 2.25 - 5VDC supply,\nsee:  http://www.linear.com/pc/downloadDocument.do?navId=H0,C1,C1010,C1096,P9790,D6998\nAlternative: MAX5094A by Maxim,  see:  http://www.maxim-ic.com/quick_view2.cfm/qv_pk/5017\nI didn't have the time to check the output power, but if it's not enough, a simple emitter stage transistor will do.
240383
It is used in microchips. Silicon is a semi-conductor which means it falls somewhere midline between a conductor of electricity & an insulator which does not conduct electricity.\n\nIt is found in virtually everything: cement, china, microchips, paints, etc. Don't forget those little packs you find in your shoe box that absorb moisture.\n\n:)
143600
Generally you take the starting DC voltage, modulate it into a square wave by "switching" it with a pulse width modulation circuit, then pass it through a high frequency transformer.  This will allow you to increase or decrease the voltage level.  After that, you pass it through another circuit to rectify it back to DC again.  This can be either a standard type of rectifier, or another PWM system if you need higher precision control.
89554
A bridge rectifier makes use of four diodes in a bridge arrangement to achieve full-wave rectification ... component bridges where the diode bridge is wired internally ...
486955
you will have an input on the ic itself.  when power is applied to either the input side-plus or negative side of the IC it will generate your output. An IC is the same as circuit put together in a smaller containment. Depending on the pin numbers of each IC each pin will determine what you must put into it the get what you want.
1126998
http://www.siliconchip.com.au/cms/A_105834/article.html\nthats an image
267781
(m)\n\nregulates high and low voltages, cuts the energy in extreme voltage conditions and incorprates a waiting time (delay) of 2" a 3" after a power failure. \nAplication: complete solution for irregular voltage conditions, can be used in all kind of equipments. Never the less is designed specialy for washing and refrigeration equipments such as display cabinets, comercial and domestic refrigerators, comercial, industrial and domestic freezers, washing machines, etc.
89506
Small board/chip that inverts power (DC to AC) to the LCD screen.  If it stops working, your screen goes black.  Depending on your skill & confidence level, not too expensive to replace.  Check out www.laptopking.com for parts.
306573
Same as the way to test a diode. One pin is negative and the other is positive. Set the multimeter to test resistance.\n\nTRansistor is a two diode cirtuit, you have to determine if this is PNP or NPN transistor. Use the negative probe and connect to N or negative pin, use the positive probe of the multimeter and tap the P or positive pin of the transistor. Correct polarity test should show a resistance, if none then its busted.\nWhile reverse polarity should show a ZERO resistance, anything else shows a short circuit.\n\nSCR or silcon control rectifier is like two diode all regulating current outward, test procedure is the same, basic is like testing diode, correct polarity should show a flow in current or a resistance, while reverse polarity test should show a ZERO resistance or no flow.\n\nKnow the part polarity pin first.
145049
You want to detect current or voltage on one circuit to trigger a relay on the second circuit?  Transistors work on voltage.\n\nCheck the link.  Is this what you are looking for?\n\nhttp://ourworld.compuserve.com/homepages/Bill_Bowden/r_ctrl.htm
107063
Yes, a full-wave rectifier can be made with only four diodes. No transformer is required.