0
votes
0answers
5 views

Replacment ceiling fan capacitor

I have a ceiling fan that only operates on low speed. I am fairly positive that it is a bad capacitor. It is a five wire capacitor that has 2.5uF/250V, 4uF/250V, and 4uf/300V. I can't seem to find ...
0
votes
0answers
10 views

Surge protect RS-232

We are designing a circuit for Connecting our uC to an RFID reader via RS232 Interface. On searching for best installation practices online I found out that a surge protector is recommended as shown ...
0
votes
2answers
30 views

Need understanding of the concept of word (memory)

I've been reading how memory works from a book. The problem is my weak english so I can't catch the meaning correctly. The text from the book : A computer with a 32-bit word has 4 bytes/word, ...
0
votes
2answers
40 views

Super capacitor vs. battery

I've made a turn signal system for my bicycle that uses power generated from the wheel. The wheel puts out 0-9v and is irregular depending on the speed. My lights take 3v, originally from two 1.5v ...
-2
votes
1answer
31 views

How can you isolate a HIGH input from two HIGH and LOW inputs?

In the circuit, only ONE value from N0-N9 will be high. So, only one of the OR gates will have a HIGH value. I need to use only the HIGH output from the OR gates output. I tried using a multiplexer ...
0
votes
0answers
17 views

DPS298CPA capacitor in 37 pfl 9604h phillips (tv) burnt. What might be a reason?

First of all I have to say that I am a rookie at this, but I know how to solder, and I have a tester. Now, the problem occured this way, TV was working, then I smelled burnt plastic, so I turned it ...
1
vote
1answer
29 views

How accurate is a single GPS at detecting distance traveled?

I read that consumer grade GPS is accurate 5-10 meters at resolving global positioning coordinates. However, my question is how accurate is consumer grade GPS at detecting distance traveled. For ...
0
votes
0answers
13 views

Mod bus PC software

I would like to talk to an electricity meter I have which has a mod bus port and looking for some either relatively cheap or free PC software that provides the following functionality. Can talk to ...
1
vote
1answer
20 views

SPI data storage devices: (micro)SD card, DataFlash, or serial EEPROM?

I am revisiting some of my design habits, and one of them is under serious scrutiny: the go-to SPI-based storage device is (micro)SD cards, for their price-to-capacity ratio and generally higher ...
0
votes
2answers
42 views

Aluminum sheet as an underlay for electonic equipment

I am planning to build a NAS into a (sufficiently ventilated) closet. For flame protection and heat spreading, I mean to put a 2x700x550mm aluminum sheet under the equipment. Is this a good idea? ...
0
votes
1answer
14 views

frequency characteristic of activ high pass filter

How can i see the characteristic(frequency response) of an active high pass filter?I attached the circuit and the value of resitence .Can i see it on the computer without an osciloscope ?How can i ...
0
votes
1answer
17 views

Generate +2V Offset on a +12VCD Supply line

I have a 12VDC @50mA_Max supply line. I need to inject a +2V 50us offset pulse to the +12VDC line, having an effective +14V for 50us. I have access to an external power supply, where I can have ...
1
vote
0answers
13 views

HC05 Bluetooth Module - Certification - Commercial Usage

I'm interested to find out if this bluetooth module can be used in commercial products in Canada? Some of you will say "you can use whatever you want" but I'm not sure, because there's regulations ...
0
votes
0answers
19 views

Power Supply Conversion Pinout Confusion

I'm trying to convert a regular atx pinout to this pinout, but to wire it up I need to know all of the pin definitions for sure, so can yall help answer these questions? The target pinout is one for a ...
1
vote
0answers
28 views

Micro controllers with high speed switching capabilities

I am planning a ESC for use with a 5500KV brushless motor, running on duel 4 cell Lithium Polymer batteries, I have noticed that in most speed controllers they use an Atmega to control the switching ...
0
votes
1answer
18 views

How can I fix Atmel Studio 7 install which is stuck on “initializing environment”? [on hold]

Atmel Studio 7 Install Is Stuck I'm attempting to install Atmel Studio 7. I've tried both the online install and the download then install option and the installer becomes stuck (shown in the image)....
4
votes
3answers
41 views

When can Self Resonance of a capacitor be a bad thing in bypass and decoupling applications?

Specifically in decoupling and bypass applications, can the Self Resonance frequency cause problems (compared to ideal)? If so, what kind of problems can it cause?
1
vote
2answers
63 views

Indecipherable Data on Serial Monitor

I have ready made working electronic product. I am applying reverse engineering on it. The WiFi module is connected to micro-controller via UART( RX & TX). The android app sends command to WiFi ...
1
vote
2answers
26 views

12 Vdc Intel fan tachometer output to 24 Vdc PLC input

I'm working on a cooling fan rotation supervision system, and I'm planning to use my old 4-wire Intel E18764 12 Vdc cooling fan to test it (as I don't have access to the 24 Vdc actual fan I'm going to ...
0
votes
1answer
55 views

LM358 Operational amplifier Ouput voltage rising with stable inputs

I'm modifying a step-up circuit based on UC3843 SMPS Controller to add a current limiting feedback to it. I'm using a low-side sense resistor (Rsense) amplified by an LM358: simulate this ...
0
votes
1answer
27 views

Which side of SPI link harness to locate SDO pull-up?

I'm looking for some help/insight into a decision I am making about whether to change a circuit I have built. My slave device requires a pull-up on its SDO (MISO) pin which is open collector. When ...
1
vote
0answers
22 views

Pickit3 overcurrent protection

The reason for these questions is I'm using these programmers to test a circuit boards with test firmware so I'm trusting the pickit3 to report programming failures without damage to the USB port and ...
3
votes
7answers
211 views

Why is the inductive reactance or capacitive reactance phasor on the imaginary axis?

As you can see there are electrical circuits of power supply, resistance, inductive reactance combination in one case and power supply resistance and capacitive reactance combination in another case ...
0
votes
0answers
5 views

Altera DE2 - LCD (CFAH1602B-TMC-JP) Initialization Sequence

I have a Terrasic DE2 and am trying to initialize the LCD and then turn on the backlight for confirmation. I've modeled the sequence all the way up to the final point described in the datasheet (link ...
0
votes
2answers
31 views

LTspice 101: Strange values with DC operating point

Just started using LTspice and I'm struggling with what is probably a total newbie mistake on a DC operating point test. Created a basic circuit, 10V voltage source and 1k resistor in series, and I'm ...
-2
votes
3answers
58 views

Logic gate summary / explanation

Is there any place (or book) where all the basic logic gates and their applications (including adders, half adders, multiplexers, demultiplexers, bit counters, flip flops, etc) are fully explained? ...
0
votes
0answers
16 views

PCI Clock from the PCIe to PCI bridge

I have designed PCI interface using PCIe to PCI in forward Bridge mode at 33MHz PCI clock. I have interfaced 4 identical PCI devices to bridge directly. The interface design seems correct as per PCI ...
0
votes
1answer
43 views

How do we balance an FIR around its center?

How do we balance an FIR around its center? I was asked this question in an interview. What does this mean? Is the center point the point corresponding to the peak of impulse response?
2
votes
2answers
45 views

Negative base current in NPN BJT

What happens if the base current goes out of the base of an NPN BJT?
4
votes
3answers
102 views

With limited components, how do I emulate a reverse-biased zener diode?

I understand that reverse-biased zener diodes don't conduct at all until they've reached a certain breakdown voltage, after which their voltage drop remains constant. I want to use this property in a ...
0
votes
0answers
3 views

Can I use a Revolectrix Power Lab Cell Pro 6 to power XB1?

I had a quick question, wondering if it would be possible to use my Power Lab Cell Pro 6 battery workstation to rig up a power source for a MS Xbox 1? Similar to this question, but different power ...
1
vote
1answer
17 views

KiCad PCBNew Change or Customize Color of Rats Nest

Is there a way to change the color of the rats nest that PCBNew uses? Ideally I'd like to be able to set the color of a specified net; specifically the GND net.
4
votes
1answer
49 views

Eagle: polygon pour leaving funny blank areas

I am doing ground pours on both the top and bottom side of a two-sided board. The top side fill seems to work fine, but the pour on the bottom layer is leaving a bunch of odd shaped blank areas (see ...
0
votes
0answers
14 views

Simple CameraLink frame grabber with standard embedded systems interface

My team and I are currently in the design phase for a cubesat mission, and cannot locate any product that suits our needs. Does there exist a simple frame grabber that can be interfaced with over a ...
1
vote
1answer
34 views

When do I need separate MLCC (input) and AL-ELEC (bulk) capacitors on my SMPS design?

I've been studying the specification of input capacitance for switching converters. I have a related question here that provides more background. In my research into the topic I came across TI ...
0
votes
0answers
41 views

BER vs distance

I have two USRP radios that I am using for estimating the BER for various modulation schemes. The factor I am taking into consideration is the distance vs BER plot . I wanted to get an overall result ...
-1
votes
1answer
29 views

Drawing Smith Chart from Network Analyzer file

I have a file as a .dat format taking from network analyzer. I want to plot Smith chart graph. The file has 3 columns which are frequency, S11(linear value), S11 (ang value) respectively. How can draw ...
0
votes
0answers
20 views

Flow of current in voltage stabilizer(Through its Enclosure/Body)

Please help me i learnt a lot from this platform I have a Made a Ac Voltage Stabilizer,with auto transformer on EI core laminates,my problem is that when i connect it i feel heavy Electrical current/...
1
vote
2answers
64 views

Question regarding 74HC574 (question very difficult to word)

Basically, I have a question regarding the timing of the 74HC574 octal latch. According to the timing diagram, the data pins must be set for so many nanoseconds before the latch pin (rising edge ...
1
vote
1answer
41 views

Problem with pic24f code

I'm trying to write some code that waits for a pin to change before continuing but it doesn't work. The code that I already have is: ...
0
votes
1answer
36 views

Battery powered, wearable, non line of sight, short range metal detector?

I want to build a circuit to detect when people bring their hands close to their mouth. This could be used to warn chronic nail biters of impending nail biting for example :) The idea I have is that ...
1
vote
1answer
54 views

Passive RC network with voltage gain greater than unity?

I'm a EE student who recently purchased the classic Art of Electronics (new 3e). I was reading the first few chapters when I was referred to appendix J in the book depicting a SPICE tutorial but also ...
2
votes
1answer
29 views

Eagle Can't back annotate

When trying to delete a via that I placed in the board manually I get this error. The via (yellow error) was placed to stitch the ground planes together and has nothing to do with the schematic. Why ...
0
votes
2answers
82 views

Do longer wires consume more power?

In DC, for example at 12V, will a longer power wire (lets say 10 meters vs 10 centimeters) cause a high current consumption?
0
votes
0answers
23 views

Make a Bipolar Driver Circuit using Transistors

I've been looking for a good tutorial explaining how to make an H Bridge, using transistors, to drive a Bipolar stepper motor. I know there are modules that accomplish this but I want to know what's ...
2
votes
1answer
46 views

Is it useful to think of SMPS input capacitance as part of an LC filter?

I'm at the stage of learning about switched-mode power supplies that I'm focused on understanding the role of input capacitance. Just for background, I'm working with a buck topology for this ...
0
votes
0answers
47 views

Unable to assign value in an always-block

NO IDEA that the value of register just never changes whatever the clock and the cases are. but no problem while compiling. WHAT is happenning? It is really confusing... ...
0
votes
0answers
19 views

SystemVerilog Memory Addressing

Just to preface this I am new to HDL. I had a semester long course on it last year but we didn't cover buses or memory in enough detail. I have been modifying some System Verilog code I was give as a ...
0
votes
0answers
48 views

Make DE0 Nano board to be Bootable and use SDRAM to store hardware and software

I have been stuck with this problem for MONTHS, please help me. I am currently working on a Nios II based design using the DE0-Nano board and the on board 32Mb sdram. My system is as follows: ...
0
votes
2answers
36 views

truth table in programmable logic array in digital electronics

While studying programmable logic array ,i came across this truth table but couldn't understand the logic how z1 and z0 are filled here ? ...

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