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Why there is no driver circuit needed between 8051 microcontroller and an optoisolater?
Wiki User
∙ 15y ago
Are you referring to the original Intel 8051, or one of the many variants? The 8051 has weak internal pullups on the i/o pins, and can source only about 60 ua, but can sink 1.6 ma, still not much when it comes to driving the led in an opto. Some 8051-based dervatives can sink much more current. Atmel's 89C2051 for instance, can sink up to 20 ma per i/o pin. This can directly drive most optos.
Wiki User
∙ 15y ago
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What is a driver transistor?
dirver transistor is added in a circuit so as to provide required voltage at an operating current which can not be provided by the microcontroller
Can you suggest more efficient led driver circuit?
We probably can. You would need to provide the original circuit first, though. :D
What is the difference between source driver and sink driver?
A source driver applies voltage to a ground (common)-referenced load. A sink driver grounds one side of a load which is already connected to the supply voltage. Given the same family of drivers, sink drivers generally have the greater current drive capability of the two.
How can you implement darlington pair using mosfet?
its not too hard... darlington transistors are simply a pair of bipolar transistors which allow for control of a significantly greater current or voltage (or both) via a low power signal such as a microcontroller. Frequently Transistors that can control a larger current or voltage require a higher gate voltage (Vgs) to fully turn on the transistor than the microcontroller is able to deliver so a smaller transistor is used to boost the control signal. You can build your own darlington out of a pair of bipolars - one that runs at logic level and boosts the signal to control the second one that runs at the higher current & voltage of the end device. The same can be done with mosfets. There are a fair number of mosfets that can control a decent current and voltage but in many cases you'll need to use either discrete boost (charge pump) mosfets, or a control chip that has built in charge pump circuitry. This is a fairly common requirement in building motor controllers and amplifiers which are or can be controlled by PWM or some other form of logic level signal. The international rectifier IR2104 is a good example of logic level mosfet that can be paired with a more powerful mosfet such as IRF540N for the actual current control. As mentioned you can also use a driver circuit such as those found in the HIP408x series which will obviate the need for a boost mosfet - this configuration is found in a number of commercial motor controllers including those by numerous wheelchair manufacturers.
How electric tester works?
There are many types of electric testers in use. One kind is a two contacts tester where there will be two connecting leads and one or more neon lamps to indicated the presence and approximate magnitude of test voltage. Here one contact is placed on the wire to be tested and the other lead is placed on the reference level like ground or other circuit parts. Another kind is a one contact tester which usually is in the form of a screw driver. The end portion is placed in contact with the wire to be tested and the back of the tester is touched by a body part. A neon lamp inside the transparent tester body will glow if the wire is live. The lamp needs only very little electric current to glow that, it uses the capacitance and resistance of the human body to complete the circuit by making a current flow to the ground.
What is a driver transistor?
dirver transistor is added in a circuit so as to provide required voltage at an operating current which can not be provided by the microcontroller
Can you operate dc motor using computer via microcontroller?
Yes. You probably don't want to do so directly unless it's a really small motor. An H-bridge, or similar circuit is probably easiest to use. The microcrontroller would interface with the computer, likely through a serial link. The microcontroller would then control the H bridge through several outputs. Depending on the microcontroller, H-bridge design, and motor to be controlled, the microcontroller might not be able to drive the H-bridge and an intermediate driver chip may be needed.
Why do you use buffer between micro controller and gate driver circuit?
thu ni yankamma
What is the difference between controller ic and driver ic?
Driver IC is device which controls the flow of current through other circuit or other components.
A screwdriver placed across two wires in a circuit creates a circuit?
Depending on where in the circuit the screw driver is placed it could be used as a switch or it could short the circuit out.
Why ULN2803 is not directly connected to a relay why it is connected to a relay via microcontroller?
You actually have that reversed. A microcontroller is connected to a relay via a ULN2803 (or other power device driver IC) because the output pins of the microcontroller can't drive relays. The ULN2803 darlington transistors provide the power amplification and the inductive kickback protection needed to drive the relay while only lightly loading the microprocessor output pins.
I have an airbag warning code 36 on 1999 Lincoln Town Car What does it mean?
Lamp Fault Code 36 has four possibilites, of which are the following: -Driver Side Air Bag Circuit Shorted to Ground -Driver Side Air Bag Circuit Shorted to Battery or Ignition -Driver Side Air Bag Circuit Resistance High -Driver Side Air Bag Circuit Resistance Low With that said, it's most likely your driver air bag needs to be replaced. Hope this helps.
Where is the power window circuit breaker on a 2001 town and country?
Hi! The circuit breaker is located at the Back of the Driver's Seat.
How do you make a driver circuit for a 200mw 650nm laser diode?
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Full form of uln driver circuit?
universal logic network
Can you suggest more efficient led driver circuit?
We probably can. You would need to provide the original circuit first, though. :D
What is transistor relay driver?
a transistor circuit for driving the coil of a magnetic relay.
