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I am currently designing a 2-digit BCD counter circuit using an IC 555 as the clock (Astable mode) connected to two IC 4033 (BCD Counter/Decoder) and Seven Segment Displays. I need expert verification ...
Maulana Alvisheva Widyatmaka's user avatar
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3 answers
375 views

I am running a 25W DC load at 5.2V. When the power is cut-off I want a parallel capacitor such that it can keep running load for 1 second. What capacitance is required? Is calculated using x2 methods &...
nightcrawler's user avatar
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This is an RF current sensing circuit with a 1:100 (Primary:Secondary) transformer. I want to derive a formula to calculate the current flowing through the primary circuit. I have written some ...
RD Akam Teb's user avatar
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I'm designing a circuit which has to meet the standard IEC 61010-1. It has a transient voltage limitation at the input, so I can calculate my clearances according to section K.3.2. The surge ...
c-a's user avatar
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I am using an n channel logic level convrter, pulled up by 12V on drain and 3v3 on Source. When gate=3.3, Rds On= 191mohm. In my simulation and testing I see 1.27V through the FET. How is this ...
ninotorres's user avatar
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I'm trying to figure out how to estimate the losses in a transistor and compare "Power Stage Designer Tool" with my calculations. For example, take a transistor NVBG020N090SC1 Frequency 25 ...
Владимир's user avatar
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3 answers
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I am building a load cycler to charge and discharge batteries. The part that is measuring the voltage of the battery is done via the analog pin of the Arduino. It is able to measure the voltage to ...
risa's user avatar
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I have kind of a newbie question. I did not find much convincing answers online, and I talked myself into a spiral where I am convinced by my calculations but am also convinced I am wrong. Basically, ...
Crabe05's user avatar
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I have the following problem in this task: For the circuit in the picture, find the currents using Ohm's and Kirchhoff's laws, also calculate the balance of powers. The numerical values ​​are: R1 = 40 ...
Svetlin Ivanov's user avatar
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I am new to electrical engineering and am building a boost converter project, which takes 2.4-3 V input to 5 V output. I simulated my results in LTspice to check if it works. My hand calculated duty ...
dishcat15's user avatar
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For inductor design, I referred to this document, which states the following: How are equations (17) and (18) derived? What is Kc? Okay, I know it's the Crest ...
slimcolt's user avatar
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I am designing my first voltage-fed push-pull converter, and I got stuck during the transformer sizing process. I am not exactly sure how to proceed. I have determined the primary and secondary peak ...
slimcolt's user avatar
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I'm studying an interesting circuitry that generate a high voltage pulses to prime a DC/DC isolated regulator: https://www.vicorpower.com/documents/application_notes/...
St7ven's user avatar
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I have quite a few resistors but occasionally I run into a situation where I need some specific value I don't have. in those cases I just select a a starting point (more or less at random) and then ...
EmilEmilchen's user avatar
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Here are my specifics. I am looking at quickly cutting a wet-paper-like material approximately 0.2 inches thick. The material stands up on its own and is separated approximately 0.33 inches apart each....
Ladle's user avatar
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2 answers
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We are trying to build IR Blaster based on schematics provided by Tuya. I believe Tuya based IR blasters sells hundred of thousands per month if not millions. So I am quite sure that their schematics ...
Gailu's user avatar
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How can I calculate the sweep time of a PLL for a given bandwidth and a frequency span and setted step? Let say: Span 30MHz Bandwidth 30KHz Steps 200KHz Edit: So lets say we want to sweep from a start ...
Tintin's user avatar
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I have designed a transimpedance amplifier as follows: Based on the simulation, I should get around 58 dB for SNR @3MHz: But what I achieved in my experimental results is as follows: Supply voltage ...
Andromeda's user avatar
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Well, I read somewhere that the slower the railgun is, the higher its efficiency, so I started trying to find out what would be the efficiency of a railgun actuator to move a heavy object (3000kg) at ...
Fulano's user avatar
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I am a hobbyist and I am not a native so bear with me please. I was looking for a fast mosfet and by looking at some datasheets I noticed that switching time is not a constant parameter like this one: ...
Tintin's user avatar
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I have a device that requires a certain rise/fall time for its input clock. It specs a .7ns rise and fall time with a 20% to 80% measurement at a Cin=6pf. I should note that the spec rise/fall time ...
Matty's user avatar
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I managed to derive the "non-inverting op-amp" circuit using equations from the general formula of negative feedback. Unfortunately, I could not calculate the "inverting op-amp" ...
slimcolt's user avatar
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I have an assignment, where I have to calculate the values for a current limiting resistor (R3) and a voltage limiting resistor (R14) for a variable power supply. The input voltage to the circuit is ...
Magnus's user avatar
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I'm designing my first PCB and I'm not sure if the diagram I found on a datasheet is complete. For what I have read, there should be a resistor between R1 and the transistor Tr1. I have followed this ...
Waripolazo's user avatar
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This is definitely a very simple question for those in this community but I’m in a bit of a jam here. I did a lab where we simply measured the current, voltage and resistance on a low voltage trainer. ...
Aidan Patten's user avatar
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1 vote
2 answers
276 views

I have this question from my Electrical Electronics textbook. After repeated efforts I still can't manage to solve it and the textbook doesn't provide enough information to be able to solve this ...
Olalekan Adekanmbi's user avatar
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2 answers
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I'm facing to following problem: I need to turn on 5 LEDs (2 V, 30 mA) in series from a 12 VDC power supply using a MOSFET (2N7000G in this case). To calculate the resistor this formula was used: 12 V ...
SkePsis's user avatar
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1 answer
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This is more of a mathematics question than an electronics one. With this circuit, I want to know the state of the switches above the resistors, without looking at them. The use case is that I have a ...
Wer Bn's user avatar
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3 votes
3 answers
439 views

There are base resistor calculators and multiple questions are answered on the subject of base resistor calculation. However, the BC817-40 I am using from MCC is showing two different gains (HFE1 and ...
Gailu's user avatar
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1 vote
1 answer
248 views

Maybe someone can help and knows how to calculate the differential gain and common-mode gain in a differential amplifier. Will the formula for differential gain be Ad=Rc/2Re, i.e. in my case 50/40=1....
grigoriii's user avatar
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1 answer
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The circuit given in the following Figure is a voltage regulator which is used to supply a constant voltage. It has the following properties: Vin = 20V, Rs = 1 kΩ, R1 = 200 Ω, R2 = 800 Ω, R3 = 2 KΩ, ...
NonComposMentis's user avatar
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1 answer
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This is a very general question, how to calculate the capacitance needed for a bypass capacitor? Is there a rule of thumb because I usually find values like 0.1uF for high-frequency bypass caps.
Bananabread's user avatar
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I bought six 250 cm long addressable 24 V LED flexible tubes from Sunliteleds.com According to the producer it uses 28.8 W/m 2.5 meters x 28.8 W = 72 W / Strip So if I use a battery with 10.4 Ah at 24 ...
pixelcrash's user avatar
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2 answers
228 views

I am new to electrical engineering and want to build an LED 4x4 cube. The schematic is below. I need to know how much power I need if all LEDs are on at once. The LEDs I use use an average of 2.8V and ...
Finn's user avatar
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0 answers
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I have test results. As we can see, there is a lot of information about voltage, current, watts, capacitance, etc. I have tried to calculate the capacitance value (Cap./Ind.) in the picture, but I ...
user16266657's user avatar
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0 answers
60 views

I need to find a constant current source for a variable LM317 current regulator (schematic below), and I would like to know which JFETs to use. Can somebody let me know how much current I need and ...
Klumpy7's user avatar
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1 answer
108 views

Basically I'm controlling a VCA (AS2164) with my Arduino through a 10 bit DAC. All is working well. The VCA output is then gained x 3.3 though an op amp, which in my calculator gives a 10dB boost. The ...
Jesper Kragh's user avatar
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1 answer
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How can I calculate beta with only the data in the image? Q is the quiescent point. I've tried with the basics Vcc formulas, but since it doesn't provide any value for Vcc I could not proceed.
Enzo's user avatar
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0 answers
168 views

I have been trying to figure out my wire gauge standard in AWG format. I bought a coil (100 meters) of wire and the info written on the package is: 1 x 0.75 rm. I understand the 1 in here represents ...
Md. Imran Hossain's user avatar
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0 votes
2 answers
74 views

I have a SMD2835 IR LED with dimensions of 0.28cm X 0.35cm and beam angle of 120 degrees. How do I calculate the irradiation area if it is e.g 1.5cm away?
HJR's user avatar
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1 vote
2 answers
282 views

So I've recently discovered that when a crystal oscillator says "20pF", it does not mean "use 20pF caps". (Despite that the design I made under that assumption appears to work.) ...
Erhannis's user avatar
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1 vote
1 answer
186 views

I need help determining the derivative time of a real PID controller. Above me is an ideal PID controller. In my case I have another resistor (let us say R0) before R1 and Cd serial. How do I now get ...
helphelphelppp's user avatar
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2 votes
0 answers
129 views

I made a measurement using thermocouple to measure the case temperature of my TO-220 linear regulator (L7809). I'll be using degrees celsius for all temperature units and degree Celsius/Watt for all ...
Shadow's user avatar
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2 votes
1 answer
311 views

I want to add a MOV to the input of my circuit. I came across the following MOV. The specs I require will be the following: Max voltage 300V AC rms Surge voltage 1.4kV Response time 8/20us I have ...
JoeyB's user avatar
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1 vote
1 answer
888 views

I'm not sure how to go about this, but the answers are below
Xeocas's user avatar
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0 votes
1 answer
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I have a motorcycle and its taillight had an incandescent (filament) bulb. The wiring diagram says it's specification was 18W for 12V supply. Now, I want to use an LED (or several) in its place with ...
user39154's user avatar
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7 votes
2 answers
561 views

I'm building an EMI sensor and trying to understand how it's done with the Elektrosluch. Here's the full schematic but this is the part I'm concerned about: simulate this circuit – Schematic ...
Andrew Li's user avatar
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2 votes
1 answer
324 views

A 12 kW, 120 V DC series generator has a series field resistance of 0.05 Ω. The generated EMF is 135 V when the generator delivers the rated load at its rated terminal voltage. The armature resistance ...
boseliker's user avatar
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3 votes
3 answers
1k views

I want to calculate the speed with the help of an acceleration sensor, such as a ADXL345. I thought that it should be integrated, but according to the information that I have received, it seems that ...
Ho3ein H K's user avatar
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0 answers
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What formula can be used to get this output? I tried using superposition theorem but the output is not coming the same. Considering V1 off and V3 at 3V : V- = 3V (2k/5.32k) = 1.128V Considering V3 off ...
user642000's user avatar
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