All Questions

0
votes
0answers
38 views

What will be vo/i for given circuit?

Solve using both approaches first using small signal analysis and then using feedback analysis.
15
votes
3answers
3k views

Why is USB Type-A to USB Type-A never used?

I was wondering why almost all USB cables that exist are USB-A to (Micro-USB | USB-C | USB-B | etc.) Why was USB-A to USB-A not a popular thing? Is there a technical reason this cannot work?
1
vote
1answer
47 views

Non-systematic (7, 4) Hamming code encoder

I have to do the scheme of the non-systematic Hamming code encoder (not cyclic but classic). But I have not found any source where it would be written how to build a generating matrix and create a ...
0
votes
1answer
71 views

Class A amplifier with preamp design

I am currently working on a class A audio amplifier designed to work with line in voltage (about -400mv to +400mv). I plan on using an IRFP240 for the mosfet but am undecided on the transistor stage. ...
0
votes
3answers
68 views

Is the switch representation for this logic wrong?

In an old text I came across the following for A’B+AB’ logic: It seems the bottom logic gates follows the logic but Im bit confused about the switch representation. Isn’t it wrong?
3
votes
1answer
78 views

Why is wave pipelining so rarely used?

Wave pipelining (a technique of removing latch overheads by having two or more "waves" propagate through a multi-cycle pipeline stage) has been used in the past for pipelining cache access (HP PA-7000?...
0
votes
0answers
44 views

400 V 3 phase European to US [on hold]

I will be acquiring a heat press that is set up for 400 V 3-phase European standard. Will I need a special transformer or converter to use in the US? Here are the power specs: 400 V 3 phase 30 kW 46 ...
4
votes
3answers
848 views

Paralleling mosfets to reduce Rds On?

This if a fairly simple question. I have some APT43M60L MOSFETs with a fairly high on resistance. They get quite hot and waste a lot of power in my induction heater. They work great but get really hot ...
0
votes
0answers
32 views

ESP8266 Webserver not reachable after 2 minutes from reset

I have a Keyes Espressif ESP8266 NodeMCU, I have two LEDs that I want to control which are connected to the ESP. When I open the webpage http://10.0.0.5/5 after ...
1
vote
2answers
90 views

Reasons for using no conductor finish on PCB

Some PCB manufacturers, such as Eurocircuits or PCBWay, offer the choice of no conductor finish (vs ENIG, HASL, Immersion Tin, OSP or others). Since this option is not often chosen, it raises the ...
0
votes
1answer
25 views

Meaning of 'Scatterer' and 'point scatterer' as opposed to just using the word 'target'?

https://earth.esa.int/web/guest/missions/esa-operational-eo-missions/ers/instruments/sar/applications/radar-courses/content-3/-/asset_publisher/mQ9R7ZVkKg5P/content/radar-course-3-the-radar-equation "...
2
votes
4answers
170 views

Understanding this power supply design

I'm doing some kind of reverse engineering to this very old power supply design. I'm having hard time trying to understand it all. I'm asking for some hints that help me read this schematic. From this ...
1
vote
2answers
53 views

Dim LED lamp with constant current power supply using resistors

I own a really bright led lamp that I want to dim. It is powered by a constant current power supply that can supply 37mA between 11V to 17V. If my lamp is connected the voltage settles at 13.58V. ...
0
votes
1answer
43 views

AC/DC Power adapter plug: difference between center positive/negative

Why are some power adapters center positive and others center negative (less common, at least around me)? Is there any compelling reason, something that asks for one or the other for different ...
0
votes
1answer
39 views

Rat Race (Hybrid 180°) Scattering Matrix

why the S matrix of a rat race is the following one? Which is the reasoning for determining it?
1
vote
2answers
69 views

Are there any gotchas to using Safty Capacitors (X1/X2 box style) in the construction of a filter?

I guess this is just not done for whatever reason. I hit Google and even after over 20 mins could not really find any information on point. I've got a fair amount of .47uF and .68uF X1/X2 Metallized ...
0
votes
1answer
54 views

Integrated circuit which acts as a switch

I have the following problem. I have an electronic door lock with opens the door whenever it is feeded with 12v (tested and it works perfectly). My main issue is that the signal for opening the door ...
0
votes
0answers
19 views

To ground capacitance of a power line modelling

Is it correct to model to ground capacitance of an overhead power line as ideal current source when using matrix methods for load flow calculation?
1
vote
0answers
54 views

How to program STM32f411RE chip?

I've developed a prototype using the STM NUCLEO (NUCLEO-F411RE) board and now that I am happy with design I am now in the process of testing everything together on my own PCB. All the other components ...
0
votes
0answers
35 views

FCC EIRP test results different than other countries

We have an issue with regulatory testing where our lab reported EIRP varies significantly between separate labs who have tested for FCC and another country. The test methods are quite different. The ...
1
vote
1answer
57 views

Do I need a stereo digital microphone? [on hold]

I am working on a voice recording application. The circuit simply has microcontroller, flash memory and mems digital microphone. What are the advantages of using a stereo microphone on the quality ...
1
vote
1answer
76 views

Photodiode showing triangle waves instead of square? (re: need op amp?)

I'm trying to visualize an infrared signal using a IR receiver diode but my oscilloscope is showing triangle waves instead of square for the carrier frequency: One of the guys at EEVblog said I need ...
2
votes
1answer
47 views

Controlling Mosfet with ATTiny85 and IR Reflective Sensor

My plan is to start a motor, then stop the motor when the gear teeth gets to 15. I will be able to tell at what position the gear is by placing an IR reflective sensor under the teeth. The sensor is a ...
1
vote
1answer
36 views

How to solder the 4-pin battery connector back to phone's motherboard?

One wickedly hot day the battery of my old Nexus 4 swelled up. I use that phone as Android development platform, so most of the time it was plugged into the computer for USB debugging. It's been ...
3
votes
1answer
63 views

Filtering a Square Wave into a Sine Wave

I am trying to Filter a +-4V odd inverted square wave into a sine wave. How should I go about doing so? So far I have computed the Fourier series of my particular input signal to be: Which I ...
0
votes
3answers
50 views

Filtering for USB VBus to 3.3V

I have a circuit taken from an FTDI app note that takes USB +5V VBus and filters it into 5V Vcc. This circuit works well. I now want to modify this circuit to output +3.3V and I am unsure exactly what ...
4
votes
4answers
195 views
+100

Turning off (collapsing the field) of large inductors

In a totally unrelated search to something I was looking for, I came across an article from the EPA that describes looking at soil properties through a large inductor for geophysics. https://archive....
15
votes
9answers
4k views

How to remove this component from PCB

Anyone have any idea how I could remove this component? I've tried blowing hot air, used solder wick, tried to poke the holes with two soldering irons, cut the pins to near the PCB, but it won't ...
-1
votes
0answers
13 views

Arduino nano and Lora SX1278 receiver hangs/stuck after some time [on hold]

I am using arduino nano with Lora 2 (sx1278), I need to run continuously. therefore I have set up a power backup as well. in the circuit, I am using LM1117 3v3 800mA power to the module and Arduino, ...
0
votes
0answers
62 views

Do carbon resistors not follow tolerance as they age?

I'm trying to figure out the problem with my LCD and resistors. The micro I'm using is AT89S52 and the LCD is a standard display based on the HD44780 chipset. Part of the code in my micro allows for ...
1
vote
1answer
55 views

Problem with mosfet driver circuit/switching

I have the following driver circuit used for switching very high current n-channel mosfets Here's their datasheet https://www.littelfuse.com/~/media/electronics/datasheets/discrete_mosfets/...
2
votes
2answers
41 views

Problem in Clock Gating Control with ARM Tiva C

When I access a peripheral register (such as a GPIO port) just after enabling the clock gating of the peripheral, a hard fault happens. For example: This code doesn't work (generates a hard fault): <...
0
votes
1answer
37 views

Capacitor DUE board 10uf polarized?

I found in the schematics of Arduino DUE some polarized capacitor but in the board I can see NO polarized capacitor. Somebody to know why ? I guess the capacitor on board is like a capacitor 50v ...
1
vote
3answers
96 views

why is transformer not considered as an amplifier?

I know that in a transformer the power is conserved on both sides, and hence there's no power amplification as such. That's fine! But if I instead want only a voltage amplification, then choosing ...
1
vote
2answers
68 views

How above should a through hole transistor sit on the PCB?

I´m soldering a self-made H bridge with several 547 and 557 TO-92 through hole transistors and I don´t know how high from the PCB should I solder the transistor. I found a tutorial just telling that ...
1
vote
0answers
27 views

How to choose high frequency inductors for high voltage line filtering?

I saw these inductors 680 uH (RL-1294-680) in each power line like shown below. The line to line voltage is 480 VAC. The inductor used has a saturation current of 280 mA. So I suppose I shouldn't ...
-3
votes
0answers
26 views

rising edge dpdt

is there a rising edge triggered dpdt if there not how can I make a circuit performing likewise the object is to change polarity automatically at each push of a button it is for changing the polarity ...
1
vote
0answers
32 views

Ringing issue in high-side IGBT connected transmission line

I am trying to charge a transmission line (Z0=4.4 ohms, propagation delay=1.4 ns) by a HV (1-1000 V, 600 mA) power supply through a 1700 V rated IGBT (S1). The charged transmission line gets ...
-2
votes
0answers
26 views

Matebook X Pro, no display, auto shutdown after 20 seconds [on hold]

I've got a huawei matebook x pro which was handed over by a friend that asks me to check and test if everything still working except for the screen, he said he dropped the laptop and there's no ...
0
votes
2answers
101 views

Sawtooth signal

I'm trying to create a sawtooth signal using low cost pasive and active components. This will allow me to compare it to an analog signal to output a PWM signal. My sawtooth signal have to be at least ...
-6
votes
0answers
34 views

Implementation of function using NAND gate [on hold]

Implement the following fuction using NAND gate F(x,y)=sumation(1,2)
0
votes
2answers
55 views

What is meant by “doppler extent”?

A google search of "doppler extent", Where I found the term: Extracting Target Features from Angle-Angle and Range-Doppler Images 1993 - ‎Cited by 5 - ‎Related articles Doppler extents (as for ...
0
votes
2answers
48 views

What is the difference between IQRn 0 and IRQn 1?

I am using STM32CubeMX to program my chip. Essentially I have a timer that i am trying to set to one ms, and every time that timer reaches a ms I want to toggle a pin. My question is that does it ...
-1
votes
1answer
42 views

Asynchronous Sequencial circuit homework problem

i have some problem with this homework, i cant figure out how to continue the project. I would be grateful if you could help me (Sorry for my bad english) "Given the table in the figure, continue the ...
0
votes
2answers
117 views

AD725: is it dot crawl - and what to do about it?

Device's datasheet says One well known distortion of composite video images is called dot crawl. It shows up as a moving dot pattern at the interface between two areas of different color. It is ...
1
vote
0answers
15 views

Determine the output power vs output capacitor characteristic of buck converter [on hold]

In a buck converter with a resistive load, I need to find the characteristics of power across load VS output capacitance. Is it possible to obtain a function?
0
votes
2answers
49 views

Level shifter for WS2811 led strip

I'm trying to control a WS2811 Led strip with an ESP32. I'm using a logic level shifter to convert the 3.3V output of the ESP32 to 5V. I bought this level shifter (txs0108e) https://fr.aliexpress.com/...
0
votes
0answers
23 views

termination of a parallel wire differential transmission line as delay line on variable dielectric constant medium

Well this has quite a long title, lets explain the situation I'm currently working on the design of a sensor to measure the dielectric permittivity of a liquid medium, the idea is to use a ring ...
0
votes
2answers
147 views

Why 2 electrolytic capacitors and Schottky rectifier at power supply?

I am trying to design and improve the power input part of my circuit to supply power to a motor driver that controls 2 DC motors. I did some research and i found this circuit but i cannot fully ...
1
vote
1answer
49 views

Foster's Reactance Theorem - Reactance Increasing with Frequency?

I'm currently reading a text on analog filters (Zverev) that discusses Foster's Reactance Theorem in relation to passive circuits and I was thrown a little by the text that says: "Physically, this ...

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