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223 Threads found on edaboard.com: Source Sink
Whats the better way to connect LEDs to MCU (microcontroller) pins 1. MCU Pin to Anode of LED (source Current) 2. MCU Pin to cathode of LED (sink Current) I have had some issues when sourcing current (option 1). after continuous usage, the pin of MCU was damaged.
Hi, I have read the article on current mirror and understood that current mirror using PMOS can be used as current source and current mirror using NMOS can be used as a current sink. I am not sure, where can I use current sink current mirror and where current source current mirror in the circuit. Could you please (...)
Pmos/Nmos current mirror can be used to amplify the source/sink current. 130489 If the input current direction can be both directions, what kind of current mirror can be used to amplify the input current? Thanks.
High impedance doesn't mean the drain can't carry significant current, it means that, in the saturation (active) region the current does not vary much with a change in drain voltage. In that region the current is largely determined by the gate-source voltage. In other words the drain tends to look like a current source (sink).
Hi, All this depends on your circuit. You should give at least your example circuit. * Supply voltage? * output current? source only? or sink too? gain: How much gain do you need? What is the input voltage? I estimate it should be a unity gain buffer, am I right? BW: For me a reference voltage could be considered to be DC. Now it depends on the
To know the inverter power (magnitude and direction), you'll multiply and voltage and current (instantaneous power) and average the product. Under circumstances, it's sufficient to form sign(P) = sign(V) xor sign (I), needs only two comparators. The inverter can also "source" or "sink" reactive power, in this case sign (P) will flicker with doub
The datasheet of most Mosfets shows it conducting a high current when Vgs is high and conducting a low current when Vgs is low. But each Mosfet is a little different and the resistance between drain and source is affected by the temperature and by the Vds. It becomes a current source or sink.
Hello, We are using ACS770LCB-050U-PFF-T hall sensor. On page 5 of its datasheet it says the min load resistance from VIOUT to ground is 4700R. It also says the maximum load capacitance is 10nF. Does this mean we have to connect at least 4700 (or lower value) from VIOUT to ground? Also, does it mean that we may not connect more than 10nF from
Are you asking if you need something between the power supply and the motor? If it's a 12VDC motor you can safely apply the 12V power supply across it. If by ignore the transistor and resistor you mean you don't plan to use them then that would be an issue. The Arduino pins cannot source or sink anywhere near 950mA. If you
Hi all. I am currently working on a project which involves an mp3 module and i would like to get an led to react (in light intensity level) to the amplitude of the signal it generates. i am using a transistor to drive the led with the base connected to one of the mp3 modules speaker outputs which is amplified(enough to power a 5w speaker).the emitt
Hi all, if we have a current mirror to generate a current source signal or sink signal, with repetitive rate frequency, such as sine wave, are we able to apply some low pass filtering circuit directly to this current, and generate a close to DC level current? Thank you!
Why shouldn't it be? You have a matched current sink at the source, the gate terminal is biased at the same voltage as what makes the current in the MOS-diode stack, the only difference is Vds which is pushing the source up a little as channel shortens. Were you expecting perfect matching with imperfectly matched terminal voltages, or (...)
hi, The TS555 CMOS versions have lower source/sink current specifications than the NE555 TTL versions. What is the application.? E
Hi All, Am trying to charge a battery from solar panel array and for that am using mosfet irf 150. Driving it low side. i.e, load is conected to drain and source is conected to ground and am using a diode between battery (load) and solar panel Array. Now microcontroler will monitor the voltage of both solar panel array and battery (which is being
From what I understand is that the column is driven from the shift registers (source), and the rows are driven from the MCU (sink). If that is corrct, I can't see why the shift register needs to be shifted 120 bit for each row? If you rearrange your program and circuit so the column is common, you may shift 1 column at the time, without rewriting
Hello All, what is the difference between these two conditions: 1. the bulk and source of a nmos is connected together and both are grounded (assume a current sink nmos) 2. the bulk and source of a nmos is connected together and both are at some positive potential(assume a cascode nmos ). i wanted to know that will the threshold (...)
Folks, I've searched the datasheet for MSP430G2210, but I can't seem to find how much can its I/O pin source and sink. The only number I was able to find was 48mA max *combined* for a port. What I want to do is to drive an LED with 10mA. Either way would do: source or sink. Doe
Any LDO can be made into a 1mA CC source or sink. Some LDO's use 2.5V; this one uses 1.5V thus 1.5k gives make your design work , the voltage drop on (1k+1.5k)*1mA=2.5V =Vref thus zener bias R must be changed to < 2.5k , pref <2.2k.
It's also not completely clear what "differential current" means for you and how it will be sensed, can be e.g. dual ground refernced current sink, truely floating differential current sink, etc. But a schematic including the current source should clarify.
sink versus source is only a different (more graphical) way to describe current polarity. Asking generally about "sink and source" current doesn't make much sense. The input or output current of device depends both on the external circuit and the internal function. A datasheet specification can have very different (...)
This is not the way to design an RF power amplifier. The Impedance seen by the drain is related to output power and useable supply voltage. The source should be directly grounded and the bias set according to the operating class of the amplifier. I would suggest AB rather than A. I don't have time to go through all the steps required but to make
I believe, the challenge in designing FPGA image processing algorithms is to organize the sequential processing of image elements, using internal or external RAM as data source and sink. I won't expect that a HDL coder has the intelligence to achieve this. The focus of the Matlab HDL coder is particularly speeding up simulation code by utilizing
The most popular methods are to use a switched current source alternating from,sink to source at safe levels and looking at the response time for excessive capacitance which can signal an "almost short "in CMOS or a low voltage swing. Backdriving junction points incircuit are often done by ATE but this won't detect leakage, just transfer (...)
What is the typical current that can be sourced from the output of a gate of CD40xx series (especially CD4093). Can we source higher current from 74xx series gates? For future reference, what should one look in a Datasheet to find this detail?
The cheap and dirty way for slew rate control is a series gate resistor on the final sink and source devices. That scheme has variabilities from Rg, Cdg and Vdd. If you want something super controlled you're probably talking a closed loop, quasi-integrator type feedback with a reference, and this is unlikely to support high speeds well. How "pa
It won't regulate 500 mA current in the LEDs. try again. 1) design a 500 mA CC sink that works with <0.1V drop to max of 2V with power loss calculations using a 50mV shunt current sense R and MOSFET regulator. 2) then carefully choose two Power Schottky diodes (1V@5A) as "exclusive or" or Diode OR logic from each power source so that you know
The main problem is that the virtual ground isn't designed to source or sink DC current. Loading it with the processor supply current would cause severe inbalance.
Hi, Is there anyway to detect when a sink device has been switched / selected. There is pin 19 hot plug detect but I presume that is only when a source device is powered or connected? So if you have a monitor or TV with multiple sources is there anyway to detect which port has been selected without all the handshake data? Many (...)
hi i want to design a 12 volt and 5 volt power supply from 16 volts..i'll use two regulators LM7805,LM7812 my question here should i put the regulators after a single bridge or use double bridges , one for each regulator , how to calculate power dissipation and sink used note that am using single ac source thanks
Vdd supports 15V Logic and 3 Terminal regulators will source current but not sink any, hence if the LDO output is pulled up, it doesn't take much current to do so. However the driver chips indicates. Vss Logic supply offset voltage w.r.t. COM = Vcc -25 & V + 0.3 and Iqdd Quiescent for Vdd supply current = 30 uA max. - meaning it s
GBW product of most Op Amps are low, so use unity gain. ESR of LED is low ( 15 Ohms ) so emitter resistor should be low ( 100 ) Then to make constant current sink use feedback from emitter or FET source instead of OA output. e.g. I would design this way THen the BW is limited only by the Op Amp's max BW at low gain. [ATTACH=CONFI
There are many ways to implement a LED Matrix. 1) Use Discrete Transistors. source transistors (This includes PNP Bipolar and PMOS MOSFET Transistors) and sink transistors (This includes NPN Bipolar and NMOS Transistors) 2) Array Driver Integrated Circuits. source (UDN2981 - 8 Channel 500mA source Drivers) and (...)
See the answer in your other thread about positive (source) and negative (sink) output currents.
CAN transceivers are also generally designed to be quite robust - they have substantial amount of current source/sink capability, and output short circuit protection. They are capable of handling the dominant/recessive bit battles on long cable lengths without incurring damage. Some of them have significant ESD and overvoltage protection built
schmit trigger in his post #4 explained the concept of power supply which can source current to the load or sink it from the load. Single transistor on output can only source current or sink it and not both.
Please specify purpose like switching speed, direction, current source and sink capabilities, etc. Analog Devices have a very good range of isolators. Link
Lets leave apart the the solenoid, motor etc. etc. The problem is if the MOSFET is overloaded, only the MOSFET should blow, not the driver! Destruction of the driver insists something else... 1. I don't see any series gate resistor to limit the inrush sink/source current from the driver. 1R2110 can handle only 2A current. First and foremost, inser
The datasheet for the Cmos 555 ICM7555 from Intersil has graphs showing the typical output current. It can source only 2mA (but its minimum current might be only 1mA) and sink 10mA (or a minimum of 5mA) when its supply is 3V from two brand new AAA alkaline cells then you will watch the LEDs dim even more as the battery voltage drops to 2V. The Cmos
It should not be possible because it looks like an Push/Pull output driver which can source or sink 4mA. You would need an A/D converter input or an universal digital/analog I/O. Enjoy your design work!
I don't think you have a variable current source, although Rs should limit the current to something less than 1.5A Is the LED well heat-sinked?
You did not say if the circuit must source 2mA or sink 2mA. You also did not say how accurate the circuit must be. In Google Images there are hundreds of constant current circuits. Simple ones are simply one transistor, a zener diode and two resistors.
If its a digital IC, then the output will have two states, High (Vcc) or Low (0V). So if you connect a load between the output and Vcc, the IC will have to sink the current. If you connect the load between the output and the 0V line, the IC will have to source the current. You look up the sink and source currents from the (...)
1. It allows a trickle charge current through to the battery even when the regulator has shut down. It also makes it think the battery is fully charged if it is disconnected so the regulator automatically shuts off when no battery is present. 2. It allows the IC to 'sink' but not 'source', it can drop the voltage at that point by making it's outpu
Energy by default flows from source to sink. Only at RF we consider reflected power and measure it. It is not the case at DC nor mains AC. Maybe rikotech8 is asking about measuring energy flow in power grid where exists more than one energy source? Who knows?
Hi Shera, You can assign the two ends as source and sink.
I think your current sources Iin1, IDSS1 & IDSS2 source current, but they should sink it, i.e. they should be reversed. Check the bulk voltages at nodes 3 & 5 !
Reference: LPC2478 Datasheet, Section: Table 9. Static characteristics, Page 55 They can sink -4mA or source 4mA with VDD @ 3.3V. However, they have a maximum short circuit current capacity of -45mA and 50mA, not to exceed the total current rating of the device.
Your description of the existing circuit is rather unclear and can be hardly related to IVC102 specification. The term "reset the photo diode" needs clarification. If the photo diode generates 100 ?A DC current, the respective shot noise will be probably the dominant noise source. At worse case, the current sink will produce a similar noise amou
The simplest way to describe them is: source current: provide positive voltage sink current: provide ground Depending on the device the output driver can be a push-pull configuration in which there are two switching devices (high side/low side) or an open collector/open drain stage in which there is only a single switch
Why sink & source options are given in a VFD and in a PLC ?