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H: What guarantees that RTL inverter is in triode region when the input is high?
in this inverter my instructor says that if Vin is high, we need M to be in triode to have low voltage in the output. now I understand this but I don't know guarantees that it will be in triode. why doesn't it go to saturation.
AI: Try lo... |
H: Type of filter represented by circuit and cutoff frequency
What type of filter does this circuit represent? I want to say it's a low-pass filter, but I'm not too sure. Also what would the cutoff frequency formula be in this case (of course that depends on what type of filter this is)? Thank you!
AI: What type of fi... |
H: Find the voltage gain of this amplifier configuration
simulate this circuit – Schematic created using CircuitLab
Hello,
How to find the voltage gain of the amplifier (Vout/Vin)?
I wish to know this in terms of Resistance numbers...if possible.
Thanks and best regards,
Vishal Sapre
AI: It's not exactly an amplifier... |
H: How the inputs of op Amp become equal?
I am a newbie. I've searched many times for this topic and I found nothing! So here am I asking: How do the inputs of Op Amp become equal?
As you can see in this internal Op Amp circuitry, inverting and non-inverting inputs are floating and there is no feedback to them. How d... |
H: charging batteries with automatic car charger through solar charge controller
Rustic cabin off grid. Seperate wiring for 110AC and 12VDc. Using solar panel through a Steca PR1515 charge controller to charge 2 12v batteries in parallel. If not enought light (at night) to charge batteries using solar, would it be OK... |
H: differential amplifier
I am designing a differential amplifier that will basically help me in measuring the current through a sense resistor of 0.015R.
Now the Vout formula is
$$Vout = {(R_f/R_i)*(V_2-V_1)} $$
\$V_2\$ - non inv voltage,
\$V_1\$ - inv voltage.
Based on this (i am using the ISL70218SRH op amp).
Now,... |
H: A confusion about error components in a data acquisition system
My question is related to my previous question:Accuracy of a data acquisition hardware
In a data acquisition system absolute accuracy is defined as measure of all error sources as following:
Abs. accuracy = error from Gain(Span error) + error from Offs... |
H: 5 Day Countdown Timer with LED Indicators
Basically, I would like to make a timer that counts down from 1 to 5 days, with each day represented as a LED. There should be a single button that each time pressed causes the timer to go up a day and indicate that by illuminating the LED representing that Day, then countd... |
H: How to use eagle cad to design a square coil
I am working in a project to design a wireless charging device. I need to design a square coil and fabricate it on PCB but i have no idea to start with the software. Using the software, what should I do.
Whether i just need to use the traces to form the square coil.
AI:... |
H: Function to Simulate Realistic Waveform
I need to simulate a realistic signal voltage triangle waveform in Mathematica. I know that a real waveform won't have sharp corners, but I don't remember exactly what a real triangle wave looks like. I have been using the waveforms suggested here and am curious if they are ... |
H: Different and opposing voltage sources?
simulate this circuit – Schematic created using CircuitLab
The diagram above, the voltage sources are equal and wired parallel, they would increase the current(2x) flow to the load(R), but what about this case:
simulate this circuit
Are the two voltage sources in series now... |
H: Strange output from an AD595 in single supply mode
device under test
I've got a K-type thermocouple wired up through an AD595AQ to an Arduino in single-supply mode (12VDC to pin 11), with the addition of an RC filter across the thermocouple inputs (330ohm resistor, 0.1uF). In other words, the thermocouple+amplifier... |
H: Does 3x22μF mean three capacitors of 22μF in parallel or series?
In the following schematic (TPS63061) several capacitors are denoted as multiples. As a newbie I am unfamiliar with this notation: does 3x22μF mean three capacitors of 22μF in parallel or series?
See figure 8 here: http://www.ti.com/lit/ds/symlink/t... |
H: Determining the VA needed for a transformer, when I know the power DC
I am attempting to design and build my own power supply. I would like to be able to get ~50VDC, and ~ 5A out of it at max load.
Unfortunately, I'm a little lost when it comes to understanding power transformers. I understand that VA does not eq... |
H: 3.3V from 5V Voltage regulator
I wish to build and get 3.3V from LM7805 voltage regulator with some extra parts like resistor and maybe a zener diode.
How can I achieve that, is it even possible to do that?
AI: What you want is probably something like this (3.3 ohm resistor, 1N4728A Zener):
I used two loads 8 a... |
H: High Precision Temperature reading, over a small range
I'm looking to get a very high precision temperature measurement over a somewhat small range. Ideally, I want at least a 0.001 Celsius increment, over a -5C to 5C range. Searching Digikey doesn't seem to leave me with anything that could accomplish this. Is the... |
H: In I2C bus protocol What is role for Combination of Pullup resistor and Slave device pin Capacitance?
In I2C bus protocol What is role for Combination of Pullup resistor and Slave device pin Capacitance? Because any one of the slave address send by master through bus the resistor and actual slave device pin capacit... |
H: Dual integrating ADC to interface with micro-controller?
I would like to measure voltage with an IC similar to the 7106 but I don't want all of the 7 segment display circuitry that it comes with. I just want to interface it to a micro so I can perform other operations beyond just measuring voltage. Does anyone know... |
H: warning the user of reverse/over voltage applied to input
I have an embedded board that I don't want it not to work due to burned or zapped components.
I want to add a protection circuit to the input power lines of the board to protect it.
What I need is a circuit that blocks two thing and warns the user by turning... |
H: How to digitize an AC signal?
Let's say I have a sinusoidal signal of amplitude 5V and frequency 100Hz. I need an accuracy of 0.1% in the digital signal.
How to determine the ADC parameters required?
Do I need to apply an offset first?
How is the process different than that for DC?
AI: I need an accuracy of 0.1%... |
H: Disable portb a/d on pic18f25j50
I want PORTB as digital inputs and it seems RB0 to RB3 are not responding to digital inputs..
So how can I disable analog on these port pins?
I'm using mikroc pro for pic..
I had the same problem with pic18f2550 but it had portb a/d enable bit in project settings...
But pic18f25j50... |
H: Class AB amplifier
What role does Rv play in this AB class amplifier?
AI: This is a class B amplifier: -
Your circuit is a class AB amplifier: -
Rv adjusts the bias point of the two transistors so that T1 and T2 are always conducting a little bit of current - this avoids excessive cross over distortion: -
See al... |
H: BeagleBone Black CAN bus setup
I am trying to connect to a CAN bus network with my BeagleBone Black and SN65HVD230. I've connected it like in the picture.
I am running:
root@beaglebone:~# cat /etc/dogtag BeagleBoard.org BeagleBone Debian
Image 2014-04-23
I loaded kmodules:
sudo modprobe can
sudo modprobe can-dev
s... |
H: LCD Panels Refresh Rate
Why some newer LCD panels have 120Hz refresh rate, and not 60Hz? How we can determine what is the most optimal resolution to use to display content on our LCD, does it depends of our CPU power or GPU power? What we get with that 120 Hz and even higher refresh rate frequencies?
AI: 120Hz pane... |
H: What's the best way to implement a MFB low-pass filter?
I'd like to design a second-order Multiple feedback low-pass filter. I am using the design in TI’s Op Amps for Everyone pdf.
There are 3 resistors and 2 capacitors that need to be selected. I'm looking for a voltage gain of 2.
What's the best method for calcu... |
H: High power equvalient for a zener
Sometimes the power rating of a simple zener diode is not enough for some works, but their precious ability is needed.
What to do?
put two zeners in series? I heard that it will work in theory but in reality the break down voltages of the them will not be equal. so the mixture will... |
H: Microcontroller programming using universal programmer tool
I am using NXP P89LPC954 microcontroller. I am having problem with In System programming(ISP). When i solder it on my board for the first time and try to burn hex file into it using phython chip prog, all the process i.e burning the hex file and verifying ... |
H: Zener diode in comparator
I am designing a comparator circuit based on a simple opamp (not a dedicated comparator). But, I read that using an opamp as a comnparator is foolish and undesirable. Why so ?
A comparator is nothing but an opamp. WHat is the reason?
Also, the reference I am giving a voltage via voltage di... |
H: Why does drain current stop increasing after a certain value of gate voltage is obtained by a MOSFET?
I recently conducted an experiment where I grounded the source of a MOSFET, connected a voltage source to the gate (vgs) and connected the drain in series with a voltage source (Vdd) = 10 V and a 1 kohm resistor. ... |
H: Is it possible to measure the voltage produced in heart
I learnt from my high school biology that human heart will produce about 1mV from the sinoatrial node.(voltage will vary like the graph in ECG test).Is it possible to measure the voltage with any instrument which can be available in a electronics laboratory(li... |
H: Explanation of Circuit?
Circuit for Time Controlled Switch
Can anyone please explain how this circuit is working? It is basically a time controlled switch? I want to know what is the functioning of each component i.e, resistor,transistor, etc?
What this circuit does is when we press the button, the appliance runs f... |
H: how do i provide low and high inputs
i am trying to create a digital logic trainer. to provide inputs through switches and outputs through LEDs, however when i connect the logic gates to the switches they don't work the way they are supposed to do. i am guessing that the gates need high or low not on or off.
can y... |
H: Lower impedance for AC coupled darlington amplifier?
I have a problem I can't quite figure out.
I essentially want to "buffer" a 50mVpp audio signal to drive a 16 ohm load.
I preferably want to use primitive components so I thought that maybe a Darlington emitter follower might be used.
The problem is that AC coupl... |
H: Most efficient way to switch order in which data is read in assembly
I have an assembly assignment that requires me to be able to store a number and via a lookup table output the number on a 7 seg display in both forward and reverse order depending on the state of an input switch.
While it's not a requirement, I'd ... |
H: Capacitor exploding in a paper plant
Two years ago I was in an internship in a paper plant in the Superintendence of Electrocontrol, in the area of maintenance of electrical equipment. Well, they had a problem regarding some capacitor banks that were installed to mantain the power factor at a certain level. The sys... |
H: Value of resistance used to calculate the MOSFET transductance
What value of resistance is used to calculate the MOSFET transductance in the formula below? $$A_v=\dfrac{v_o}{v_i} = -g_m R$$
This is the circuit in question.
I am confused on which resistance to use (R1, R2, RD). Some help would be appreciated. Than... |
H: tricolor single package LEDs do not have same intensity for each color, why?
LEDs that have 3-in-1 RGB capability where each is driven independantly of the other usually contain three seperate LEDs in a single package. Each of them is made using different material to get different light color. I see that this has t... |
H: High Current or High Voltage that damages components?
Very basic question here and I'm only looking for a generic over view, but is it a too high current or a too high voltage that will damage electronics? I assume it will depend on the component in question -
1) For example if you have a working circuit with a 10V... |
H: Kirchhoffs Law with 3 Voltage Sources
So I thought I knew what I was doing but, this 3rd voltage source is totally throwing me off. Any explanation is very much welcome.
simulate this circuit – Schematic created using CircuitLab
So I have
I1 = I2 + I3 ------------------- (1)
-I1(3) - 30 - I1(2) = 0 -------- (2)
... |
H: XC9536XL CPLD socket
I'm planning on using this CPLD: XC9536XL-5VQG44C.
I only have one question when I used the chip in the lab the chip was mounted on top of some type of socket or base and that socket was connect to the JTAG programmer cable. Now my question is if I purchase this chip from Aliexpress
will it com... |
H: Why is it good to slow down digital lines with resistors?
I've heard that sometimes it is recommended to "slow down" a digital line by putting a resistor on it, let's say a 100 ohm resistor between the output of one chip and the input of another chip (assume standard CMOS logic; assume the signalling rate is pretty... |
H: Is there a systematic way to simplify multiple output boolean functions?
While studying boolean function simplification I often find things about Karnaugh maps and the Quine–McCluskey algorithm, but I find little about the case of multiple output boolean functions.
In terms of digital circuits, I know that you can ... |
H: Buck Boost Circuit for Automobile starter circuit
One of the major problem with two wheeler like Royal Enfield is that the starter motor wont work efficiently as the battery ages with performance. Morning cold cranking the engine ignition will not start the engine but also weakens the battery life. Can a buck-boost... |
H: STM32F4 TIM2 timer, getting to 1 second
I'm learning a bit about general purpose timers on my STM32F4Discovery board, and would like to know how I can configure the timer to invoke a timer interrupt each second, or at least have the auto-reload value reset to 0 every 1 second.
I know the MCU runs at 168MHz, and I'm... |
H: How to limit current in order to power small car radiator fan with laptop charger?
I'm trying to do a makeshift small grinder/sander out of a car radiator fan, but I want to power it up with a laptop charger for convenience.
Since it's a salvaged fan, I wasn't able to look up its schematics, I only know it takes 12... |
H: What type of connector is this Velodyne interface box GPS connector?
Velodyne VLP-16 lidar's interface box has this connector. What type is it?
Could not find this from the manual.
AI: Page 35 of its user manual "Appendix B : Interface Box" shows the schematic of the interface box, where the connector is labelled "... |
H: Understanding DC-DC Buck converters
I know that many questions on operation of dc-dc buck converters have been asked in the forum. I'm really confused with the exact operation of the circuit. I've been reading about the converters and I am unable to find clear explanation.
I understand that buck converters provide... |
H: Buck converters- No Load condition
How exactly do buck converters work under no load condition?
The capacitor voltage will try to charge up to the peak input voltage, with no load connected across it to discharge. How to avoid this problem?
** I've included the simulation result. The output voltage (green curve)... |
H: Question regarding simple preamp+audio amplifier
simulate this circuit – Schematic created using CircuitLab
simulate this circuit
Hello,as you can see,I constructed a circuit which consists of an amplifier(first scheme) and a preamplifier(second scheme) connected together.The goal is to connect a low sound source... |
H: Why does the voltage gain of a transistor-based amplifier vary with input frequency?
Why does the gain of a MOSFET-based common-source amplifier depend on the frequency, and why does it vary the way it does?
I did an experiment with a common source amplifier and recorded the gain at different input signal frequenc... |
H: PIC mov command question
I have a code that prints what's in the memory of my PIC18F4550 to the serial port. I'm trying to do this in two ways but only one is successfull. Can someone enlighten me why
Version one (functional, I think atleast..)
I've done some initializations and configurations prior to the code bel... |
H: FPGA TCP Connection
Is it possible to have a TCP connection with an FPGA? I need a low power device that can control relays based on Ethernet packets that are received and send back confirmation packets.
AI: Yes it is possible.
For the low end, you could have a look at http://opencores.org/project,tcp_socket (800 ... |
H: PIC Assembler Bitwise Operator Left Shift
I am following a tutorial on programming baseline 12F series PICs in assembler.
I have a question regarding bitwise operators specifically the << left shift operator.
Lets use an example the PIC I'm using is a 12F509 so if I wanted to set GP1 and GP0 as outputs and the rest... |
H: Unipolar op amps
Ex :
My question is since it's a single supply op amp, does this mean that we can't generate negative voltage so the transfer function would bottom at 0?
AI: Yes, the output will be approximately equal to the negative supply voltage (0 V in this case) when \$v_i < V_{cc}\frac{R2}{R1+R2}\$ and app... |
H: PIC24FV Reset without Flag
I am working on building an interrupt based program flow using the PIC24FV32KA302 module from Microchip. However, I am having some trouble with intermittent resets (it seems).
I am currently using the MPLAB X Simulator, trying to find out where the issue is happening. I was originally usi... |
H: How do I repair these wires?
In the past I have occasionally repaired broken wires in various electronics around the home. However when trying to repair this cable for a Logitech USB headset, I discovered the wires are different from those I've come across in the past and also from those in the headphone repair vid... |
H: Block Diagram Reduction
Could anyone help me with the start, I don't how to begin?
AI: Hints: -
State what Y equals by naming node values: -
Y = aC - bE where a is the node_value on the input of C and b is the node_value on the input of E. Then you'd likely evaluate a from b and Y via D
So, a = c - DY then, go bac... |
H: What are the effects of running a PIC μC slightly above its rated working voltage?
I experiment with the PIC24 series of μCs fairly often and have noticed that I can run them successfully from a 3.7v LiPo battery pack without a regulator. The batteries charge to around 4.2v fully charged and down to a little below ... |
H: STM32F0 I2C not working
I am trying to establish I2C communication between STM32F030K6T6 mikrokontroller and HH10D humidity sensor. The problem is, that after I call I2C_TransferHandling() the I2C_ISR_TXIS flag won't be set, and the program stucks in the loop waiting for it.
Here is my code, I made it based on the ... |
H: What are these small stubs on the USB data pins of this device?
When disassembling a failing USB 2.0 flash drive, I noticed a feature on the USB data pins, that I do not understand from the perspective of a student just getting started with PCB layout:
They're definitely traces and not a hole in the solder mask (i... |
H: What kinds of parallel RAM are there?
I have basically no experience in electrical engineering or hardware design, but as an experienced software engineer, I recently took an interest in designing my own CPU. I followed the instructions/excercises presented in the book "The Elements of Computing Systems / Nisan & S... |
H: Normalize values from different MEMS 3-axis accelerometers
I have to find a solution to uniform values on 3-axis accelerometers on different android devices. I mean, a device with a specific accelerometer, subjected to the same acceleration, return values, for each of 3 axis, that are different from the values retu... |
H: Alternator shaft speed
I am running an alternator with an electric motor (variable speed), but I do not know the shaft speed. I would like to calculate it from voltage frequency.
The rotor of the alternator has 12 poles (6 south + 6 north >> http://www.tb-training.co.uk/images/poles.gif). The stator winding is conn... |
H: Use a PC123 optocoupler for MIDI input
Im trying to connect a MIDI input cable to an arduino. To do that, I need an optocoupler, that secures the internal circuits from damage.
This is the schematic as shown by the MIDI specification:
edit: The input uses 5V.
I have a PC123 optocoupler by Sharp lying around, so I'... |
H: Using potentiometer to measure distance in linear actuator
I need to use a linear actuator for a project. From what I understand, the position feedback comes from a potentiometer. Here is an example:
One more example: https://www.servocity.com/html/25_lbs__thrust_linear_actuator.html
Two questions:
1) How does on... |
H: How is this extremely high-resolution stepping achieved?
This question pertains to this video as well as this one by the same person demonstrating his results with a stepper motor (along with a really neat testing method involving a laser spot on a wall a few meters away!).
How did he achieve this kind of high-reso... |
H: What is the purpose of the IR-diode Cover on Remote Controls?
Some electronic devices' remote controls have their IR-diode covered with some glossy, dark acrlyic-glass like screen, others dont and you can directly see (and possibly touch) the IR-diode.
What is, however, the purpose of this cover?
And why do some re... |
H: What is the real purpose of analysing an amplifier with resistive or a current source load? How does its behaivor change?
We're analysing in class common source, common gate and common drain amplifiers and the analysis of resistive load and current load is being done but I don't get the purpose of doing this... how... |
H: Do barcodes allows to uniquely identify production items?
I hope this is the right place to ask. I'm trying to learn about barcodes, I did some research and I wonder if, I can uniquely identify production patches (not just products).
For example, is it possible, given 2 Aspirin boxes, to differentiate them via bar... |
H: Clipping circuit simulation producing unexpected result
I am playing around with a clipping circuit to protect a adc on my microcontroller. I beleive the following will work, but when I simulated the circuit I saw something funky. Any ideas on why adding the diode cause the blimp seen in the image below:
Same circ... |
H: Is it ok to use voltage dividers instead of voltage regulators when adjusting reference voltages for opAmps?
My question is about manually adjustable circuits with a knob, coarse ect. When adjusting reference voltage of an opamp, for instance, trigger level of a schmitt trigger or gain of an amplifier manually, can... |
H: Troubleshooting small home made electromagnet
I used bolt cutters to cut a piece from one of those wire campaign poster sign legs, took that piece and wrapped it (all in the same direction) with wire that was unwrapped from a small fan motor, then hooked it up to a 9 volt battery. I chose that as the iron core beca... |
H: Can I use LM324 as a Schmitt trigger?
I need 3 opams for a circuit. One for amplification, one for level shifting and one for sharpening badly shaped pulses, For the last part(pulse sharpening) I want to use a comparator/schmitt trigger. Can I just use LM324 for all since it has 4 opams inside or I need another IC?... |
H: Binary Adder and Parallel Adder
Are binary adder and parallel adder same thing? I couldn't find any information about parellel adder in my book. Does anybody have an idea?
AI: There is a distinction between parallel adder vs serial adder. Both are binary adders, of course, since are used on bit-represented numbers.... |
H: Is it possible to change the speed of an AC motor(drill press) without losing too much torque?
I have a drill press as in the image below, it runs from 110V AC 60Hz and has internal belt reduction. Unfortunately however for some materials and hole widths, I need it to go even slower than It's been built for. Is it ... |
H: Calculate rotor slip without knowing synchronous speed
I am given the rated values of a squirrel cage induction motor:
A 300hp, 2300V, 3‐phase, 60Hz squirrel‐cage induction motor turns at a
full‐load speed of 590r/min. What is the approximate value of the
rotor I2R losses?
However, the synchronous speed is no... |
H: Ribbon Cable Wattage
What is the maximum wattage (and maximum recommended wattage) for a single ribbon cable wire.
I believe the wire size is 28 AWG (maybe 26, but let's call it 28 to be safe), stranded copper. The length of the cable will be no more than 3', and it will either be 40 conductor or 50 conductor ribb... |
H: STM32: Timer interrupt works immediately
This is code for timer in my project on STM32F429:
//timer initialization
void timerInit()
{
uwPrescalerValue2 = (uint32_t) ((SystemCoreClock / 2) / 100000) - 1;
RS485Timer.Instance = TIM5;
RS485Timer.Init.Period = 67400000; // high value to notice interrupt even wit... |
H: How to determine phase angle of a three-phase circuit
I am experiencing difficulties with a question:
A balanced three-phase load shown in the diagram is connected across a 380V, 50 Hz three-phase supply, ABC phase sequence. The voltage VAB is taken as reference.
Part of the question I am trying to answer inclu... |
H: How to measure current with an analog multimeter?
I need measuring the current through a dc motor with an analog multimeter, but I don't know how to select the correct function to that.
The meter is a FT-360TR. I know it can measure currents of miliamps and it also has a function to measure currents <= 10A, but I d... |
H: Need for Buffering Signals ?
What is the need for Buffering signals ? Is it to provide the ability for the source or circuit to be able to provide high current amount ?
The buffer I was reading was the Op Amp unity gain amplifier.
AI: When op-amps are used as unit gain amplifiers, they are often used to convert a ... |
H: How do hybrid electronic systems work?
In hybrid systems, we can have DSPs, FPGAs, General purpose processors, etc on the same system operating together on the same application. How are the tasks distributed among them, and which unit manages this?
AI: The crossbar bus will have some arbitration and communication p... |
H: What does "IR CUT" do on this camera?
I bought this camera to experiment with, mostly based on the fact that it is considered to be a "Night Vision IR" camera. Now that I've received it, I am having a hard time finding out certain information about it.
Specifically, why does it have the extra pair of wires going ... |
H: Electric style motor speed control
I was just wondering how I would go about making a pedal that controls the speed of a motor. It would also have to include reverse motor capability. My tech book at school already has a circuit for reversing motor direction but might not be compatible with what you might come up w... |
H: Question about this RC circuit and voltage across the capacitor
I just have a small question about the below problem. How did they get Vc of the capacitor to be 12 V before the switch is opened? Doesn't the resistor use up some of the voltage?
AI: After it's fully charged or discharged (i.e. at DC), a capacitor act... |
H: Why do laptop batteries and chargers differ in voltage output?
As an example, my laptop's charger gives out 19,5V and 3.42Ah while it's battery gives out 11,1V and 2.2Ah, what's going on exactly?
AI: The battery's ratings are it's nominal voltage and capacity ratings. The charger's ratings are the voltage it will ... |
H: Questions about circuit diagram, Lipo charger
Circuit diagram from here
I've asked couple of questions about PS and Chargers, I keep facing new issues
using the diagram above "an automatic lipo charger, sort of",why would the zener diode conduct when the battery is fully charged, and not before or after? The autho... |
H: MOSFET switch replacement not working
I'm using a PNP MOSFET to replace a physical button. When I ground the lead I've attached to bypass the switch, the action I need activates (a notification light comes on - it's the activator button on this barcode scanner), so I know I'm working with the right lead.
In the sam... |
H: Pre-paired bluetooth chips
Is it possible to buy two pre-coupled bluetooth chips? So all i have to worry about is sending USB/Serial data to the master node..
Best regards,
Morten
AI: No, I don't see how that would work. Certainly the manufacturer is not going to be selling Bluetooth chips in pairs (how would th... |
H: Low cost H-Bridge circuit for PWM
I try to design a (relatively) low cost H-Bridge on N channel MOSFETs. I need to drive 8.5A peltier device with 12V and (roughly) 20kHz PWM.
(after reading some of the comments I changed this question to use P-MOSFETS for high side)
I plan to drive only low side MOSFETs with PWM, s... |
H: How to make 2 bit or more half adder circuit
I have no idea about electronics, this semester school gave us a strange and confusing lecture about circuits which we shouldn't take because we are no engineer or something close. Question is we should make an 8-bits fulladder and half adder logic circuit on Logisim. Ev... |
H: FFC flatline standard line numbering
Is there a standard way to number lines on a FFC (Flexible Flat Cable)? In other words, if you see the FFC end from the side with exposed contacts, do you usually start counting from the left or from the right?
AI: A common solution for determining cable wire numbering is to loo... |
H: What type is this connector?
Can anybody tell me the name of the connector shown in these photos? (I mean the biggest one, which is centered in the photos)
AI: That connector looks to me to be a power type connector with connector pins on 0.156" centers. You can find styles of these from mainstream connector manufa... |
H: Why hFE(DC gain) shown on multimeter isn't equal to the datasheed hFE?
I have a tip122 and discovered my multimeter uses Vce=2,8V DC and Ib=10uA for its hFE test. When I insert the transistor on the terminals for hFE test, the gain on the multimeter alternates between 1 and 2 when by datasheet information it should... |
H: Directly Power STM32 from Lithium Battery
I'm putting together a wireless sensor node and it's running a STM32L051 which can run at a 1.65-3.6v range. I've also got an RFM69HW radio onboard which can run at 1.8-3.6 (2.4-3.6 for full power output)and will draw at most 130mA.
I'm looking to see if I can power this s... |
H: Temporary connection between two individual very small wires
I've separated a bunch of phone wire to connect a bunch of small devices (small motors, switches, buttons, electromagnets, etc all embedded in Lego blocks) and I need a way to temporarily connect them. I have some connectors like this:
But they're far to... |
H: How to level shift an analog signal?
I have a sinusoidal input signal (with a swing of 100mV roughly) centered around 100mV (DC). This signal needs to be input to a CMOS inverter. For this I need to level shift my signal around the inverter's threshold voltage.
I need a transistor level schematic that does just th... |
H: What are these cream plastic-like blobs on my circuit board?
I see these white/cream colored blobs all over the board (I've surrounded them with red rectangles in the image above), something which I've never encountered before. They're plastic like in texture, deforming with small amounts of pressure applied to the... |
H: Why do we rectify then invert current in induction heaters?
I was trying to build a simple zone refining prototype, so I thought of How to simplifying induction heater for zone refining?
I throughly read What does a beginner need to know to build an inductive heater? And decide to drop this idea.
But all resources ... |
H: Vivaldi Antenna: size & max input power & software simulation
First, I've to say I'm a beginner in this field so please forgive me if my questions were not smart.
I was reading about Vivaldi antenna and I decided to do an experiment; I'm going to use a flat sheet of copper tape, a piece of FR4, and a coaxel cable.
... |
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