What do you mean by sourcing and sinking?
A sourcing output supplies current or voltage to the load. The output would be hooked to one side of the load, and the other side is grounded. A sinking output works by pulling the voltage or current to ground. In this case, the load is connected to the 'hot' power supply terminal, and the other end is connected to the sinking output. When the output goes active ("goes low"), current flows from the power supply, through the load, then to ground via the output terminal. Sinking outputs are sometimes called 'open collector' outputs. You can visualize it this way: Take a light bulb and hook one lead to the chassis of your car. You just grounded the load. Now take a wire and hook it to the positive battery terminal. When you touch the battery wire to the bulb, it lights. You are 'sourcing' current to the bulb. Now, connect the bulb to the positive battery terminal. Take a wire and connect it to the car's frame (ground). The bulb already has a voltage supply - the positive battery terminal. When you touch the ground wire to the bulb, sinking current to ground, the bulb lights. The big deal here is IC's that sink current typically have much greater current capability than those with sourcing outputs. So why even bother with sourcing outputs? Their main claim to fame is the load can be ground-referenced, which is very desirable in some situations.
How do you Calculate the contact rating of relay for AC and DC?
On the side of the relay there is a name plate that tells you the current carrying capacity of the contacts. It gives you the ratings at different AC voltages and a DC rating of the contacts at different voltages.
Main difference between ac and dc motor?
Dc is an electrical term for direct current. Ac stands for alternating current. As you probably guessed a dc moter uses dc current and an ac moter uses ac current.
P.S. Most home outlets use ac current.
What are the two ways of decreasing current in a standard test circuit?
Increase the resistance (ohms)
Decrease the voltage (Volts)
Determine the fundamental period of the signal xt2cos 10t 1sin4t1?
What will be the overall noise figure of two cascaded amplifiers?
say,
overall noise figure =f
noise figure of stage1=f1
noise figure of stage2=f2
f=f1+(f2-1)/g1
f1,f2 are in linear scale(not in dB)
g1=gain in stage1
Draw a full subtractor using two half subtractor?
http://img11.imagevenue.com/img.php?image=24275_full_sub_with_half_122_600lo.jpg
Slip rings are used in AC while split rings are used in DC generators
If you had a 200 ohm resistor with a silver fourth band what would it's maximum value be?
The fourth band indicates the tolerance. Silver is ±10%. Thus, (200 + 0.1*200) = 220 ohms. The minimum, then is (200 - 0.1*200) = 180 ohms. See link.
What type of circuit has the same voltage drop across each of its components?
A parallel circuit. Since a parallel circuit has only two nodes, there can be only one voltage difference between the nodes.
A floating chargeis a kind of security to which all of the assets (or perhaps a particular type of assets) from the business, apart from individuals that are susceptible to a mortgage or fixed charge, are utilized as to safeguard the borrowed funds.
What is the emitter base collector in 2N5777 photo transistors?
1st pin is emitter then collector and base
What is the function of a doiode?
This is a very fundamental question that has been asked many times. Try correcting your spelling to "diode" and you'll find a plethora of information. See wikipedia link.
In general O in diodes stands for germanium.since OA79 is a germanium diode O stands for germanium
What do you call the vacuum tubes used in transistor radios?
You don't, there aren't any.
However some radios in the early 1950s did use both vacuum tubes and transistors. This was because early junction transistors were too slow to operate at RF so vacuum tubes were used in the RF and IF sections. These radios were called hybrid radios because they used both vacuum tubes and transistors.
Soldering a MOSFET is about the same as soldering any other semiconductor. Get your static protection on and park yourself at your workstation. Clean the mounting area for the device. Apply heat sink compound if required and/or a mica or other insulator. Heat sink compound is lightly applied, and is put on both sides of an insulator, if one is used. Pick up the device (having bent or cut the leads as required), and put in on the board. Make the mechanical connection using appropriate hardware. Snug things up. Heat up the iron or station if it isn't on. Have your damp sponge and solder handy. Pick up your solder and the iron. Give the tip a quick wipe and tin it. Work on the side appropriate to the application. On double sided or just through-hole applications, you'll be on the bottom of the board away from the component. On surface-mount applications, you're on the component side. Apply the tip to the place where the lead of the MOSFET meets the copper land on the board. (You'll be heating the lead of the device and the land where the solder is going to bond.) Apply the end of the solder to the place where the tip of the iron meets both the component and the board. Watch for melting to occur. Some people "trap" the solder under the tip of the iron and gently press the solder into the component lead and board, but this has a tendency to create solder balls. As the solder melts, continue to apply it to build up a fillet appropriate to the application, and then remove the solder and the iron tip. Clean the tip with a quick wipe, re-tin it and repeat. Clean and tin the iron, and rack it in the holder. Inspect your work. (For SMD applications, you won't have to turn the board over.) Look for a clean, shiny fillet that is not too concave and not convex. Clean the extra flux off the board and the leads as required or as desired. Inspect a final time and you're done. Shut down your iron.
A light-driven semiconductor device that prevents current flow in either direction until it receives a signal.
What would happen if the LED was connected the wrong way round?
If the LED was connected the wrong way, you would have bent some pins to have forced it to go in the socket the wrong way since it is designed to go in one way. Also, since you forced it and got it out of line, you may have broken the pins and may have a horrible time getting them out. You may need to take the unit into a shop and have someone that knows what they are doing fix it.
If the LED was connected the wrong way round it would not light. There are 3 ways of identifying which lead is which. The cathode is the shorter lead. The cathode has the bigger internal plate. The cathode is on the side of the package that has a flat (D).Timing diagram of pop b instruction on 8085 microprocesser?
1. Memory Read - (PC) and then increment PC - Op Code C1 - Four clocks 2. Memory Read - (SP) and then increment SP - Transfer to C - Three clocks 3. Memory Read - (SP) and then increment SP - Transfer to B - Three clocks
How can you make a bypass diode?
the diode is forward bias
ANSWER: A bypass diode is used to bypass circuitry as soon as the diode is forward bias by 0.6 volts The use it to bypass to prevent damage to the circuitry
Why use capacitors on fan motors?
capacitor stores charge ,so we use capacitor in fan for continuous voltage supply.
What happens if you reverse a diode in a half-wave rectifier?
you will get the opposite polarity DC as before