All Questions
192,748
questions
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5
answers
117
views
How can I make a crystal oscilate?
I have a 25 Mhz crystal oscillator, and I'm trying to make it oscillate and generate a radio frequency, which then I could view on my SDR waterfall.
I have read about crystals, but I still don't get ...
- 4,132
0
votes
0
answers
34
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LCD 16x2 Interfacing with STM32 (4Bit Mode)
I am trying to interface LCD 16x2 with STM32 for learning purpose. I already interfaced with AVR, PIC etc. that code ported some of. But its not working. What am I doing wrong?
...
- 19
0
votes
1
answer
25
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Thermostat Relays Feedback
We are currently developing a thermostat design for the precise control of Electric and heat-pump HVAC systems. In this project, we have opted to use latching relays manufactured by Omron. These ...
- 4,132
0
votes
1
answer
24
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Do Isolation Transformers work within a voltage range?
If I have an isolation (1:1) transformer rated for 240VAC at 20 Amps and then I apply 120VAC at 20 Amps will the out put over the load still be 120VAC at 20 Amps?
0
votes
0
answers
19
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LTC 2065 is not working between 2 V - 4 V power supply
I'm having a problem with the LTC2065 operational amplifier design. I use a 3.3V supply as I show in the picture, and after boosting my input signal I make it oscillate at 1.8V using a 1.8V virtual ...
- 13
0
votes
0
answers
32
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NiMH battery charger of hair trimmer
Can you please help me to understand the working principle of this circuit? It's a simple circuit for charging of NiMH 1.2 V battery and driving of DC motor of hair trimmer. I'm confused because the ...
0
votes
0
answers
7
views
How to burn bootloader for 3D Printer Mainboard with GD32F103 without ICSP connector
The bootloader of a Sovol SV06 mainboard, equipped with a GD32F103 processor seems to be corrupt (the board is not detected when connected to a pc and updating via SD card does not work). There is no ...
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1
vote
2
answers
365
views
Stepper motor controlled by turning only in one direction and stalling in opposite direction
I am controlling a high-torque stepper motor (23Y204S from Anaheim Automation with 8 lead-wire) using a microstepping driver (MBC15081) and Arduino.
The winding wiring is connected as bipolar series ...
CommunityBot
- 1
0
votes
0
answers
22
views
Voltage Sag in Li-ion batteries, And how to reduce them
I have 3 18650 Li-ion cells connected in series. Each have a capacity of 2200mAH and can discharge at 10C. First of all , tell the maximum amps I can draw from them. If I am not wrong, I can draw 22A. ...
- 16k
0
votes
1
answer
26
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What is a good way to turn off/mute antenna while keeping the aperture unchanged?
I have an 2D array of 64 antenna element. Lets say each antenna is connected to one RF chain. with this array total 64 parallel data streams can be transmitted with some pre-processing. When the load ...
- 9,727
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votes
0
answers
7
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Can't debug a PIC24F04KA200 using a MPLAB Snap debugger
I'm working with a PIC24F04KA200 in MPLAB X IDE v6.05 and debugging using a MPLab Snap debugger. Programming in C. I can program the device perfectly fine. When I want to debug the program I need to ...
1
vote
2
answers
325
views
What determines the maximum number of devices that can be connected through a single port of a USB 3.0 switch?
I need to connect about 10 different electronic devices (lasers, cameras, motorized stages etc.) to two PCs, such that you can choose to control the whole setup from either one of those PCs.
My first ...
CommunityBot
- 1
0
votes
0
answers
18
views
DC-DC current mode control frequency behavior
On a buck converter in average current control mode, for example, the inner current loop sees and manages the double pole created by the LC filter, and thanks to this the outer voltage loop is blind ...
- 144
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votes
1
answer
54
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Is there a sequence of thought I can do to solve complex circuits using only KVL and KCL?
This question took me a good 20-30mins of solving, and this just feels like a long time especially when I take my midterm exam it will only be 2 circuits in 1 hour only, so I need to make sure I find ...
- 4,429
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votes
0
answers
23
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JFET + Bipolar source follower: with VGS constant, how Vout can be an AC signal?
Id is the sum of IB and IR1 with IB small. We can approximatively say Id equals IR1.
BJT give an voltage across R1 equals to VBE.
VR1 = VBE which is limiting the current flowing across R1. In ...
- 5,938
0
votes
1
answer
214
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Powering a max 360 W Ender 3 Pro with a 300 W inverter
I’m planning on powering the Ender 3 with a 200 W solar panel with a 300 W inverter. I saw on some posts that the Ender 3 draws 500-ish watts whilst starting up but then drops to an average of 150 - ...
- 111
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votes
2
answers
89
views
What does the frequency of a microcontroller mean?
I'm working with STM32 board which a microcontroller is embedded. This MCU seems to work within 72MHz max.
Now if I make a C code, does that mean each simple instructions would be done within 72MHz?
...
- 18.1k
0
votes
1
answer
190
views
Where to fuse high voltage batteries connected in series?
I have modules of cells in series each with 48V.
I wonder where is the right place to fuse the modules in series. (The current to trip the fuse is the same on every point).
Version 1:
simulate ...
CommunityBot
- 1
0
votes
0
answers
19
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what is the function of integrated Circuit 58723 25106? [closed]
I was going through the yu4711 cell phone board, i came across a ic numbered 58723 25106, looked up in google, couldn't find anything on it.
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votes
0
answers
19
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De Dietrich 300L water heater 3phase/single phase query
We have 3 phase electric supply in our rural home. I need to replace our 300l Water heater which is a De Dietrich 3 phase unit. I can't find a replacement 3 phase water heater so I am wondering can I ...
0
votes
0
answers
11
views
Parallel Battery Packs-Any concerns or considerations besides diodes for used non-rechargeable AA?
A project I am working which involves an Arduino controlling RGB LED strips. To avoid overloading the Arduino, I plan to use a 5v 3A supply for 2 strips near each other (they want 1A each) but for ...
- 199
4
votes
1
answer
179
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Proving that this JFET + Bipolar source follower give back a linear output
I was reading about this source follower and wondered how the bipolar transistor makes Vgs somewhat stable.
I believe that what happens here is that when Vin is high more current flows through the ...
- 1
0
votes
0
answers
35
views
What hardware issues can cause UART to only work with one device but not another?
I'm trying to get Waveshare SIMCOM7600G module and nRF5340DK talking to each other. The TXD/RXD from one is connected to RXD/TXD on the other. There is no flow control enabled on the SIMCOM7600 module....
- 126
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votes
1
answer
2k
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Syntax error verilog code token is 'module'
I am currently in training phase with verilog and I encountered an error near the 'module'. Basically what I did is that I want to assert the output q to be either '1' or '0' from my design, which is ...
CommunityBot
- 1
0
votes
0
answers
10
views
Create ports in Altium from (Excel) list
Related, but does not answer my question: Is there a way to batch copy port names over to net names
I'm porting and updating a design into Altium. There are about 400 port names which needs to be ...
- 13.4k
0
votes
1
answer
25
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Optimizing Solenoid Control Circuit with FETs: Minimizing Inrush Current and Hold Current Precision
I'm creating a circuit using two FETs. The first FET (U2A) is responsible for controlling the inrush current of the solenoid, and the second one (U2B) is used to maintain the predetermined hold ...
- 437k
0
votes
0
answers
15
views
How to get load capacitances from an FPGA design for third-party dynamic power analysis?
I would like to perform dynamic power analysis of an FPGA design outside the design tool environment. For this, I need the equivalent load capacitance of every net in the design. How can I get the ...
- 101
0
votes
0
answers
10
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UPS Chip for single Li-ion battery charger and power path IP5209 replacement
I am looking for chip that can do following things:
Charge single Li-ion cell while connected to USB and power off the system with it
Have power path (use USB power if available)
Small footprint (QFN ...
- 101
0
votes
0
answers
5
views
Data transfer between computer and Fieldfox N9917A using Python VXI-11 library
I accessed my Fieldfox device using the vx-11 library. But now I don't know which commands to access the data with. For example, with the CALC:FEED:MODE AVER command? I use Fieldfox programming guides ...
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-2
votes
1
answer
264
views
Is it possible to save data from a network analyzer?
Im using N9917A Network Analyzer for measuring s-parameter values. I have connected the VNA to PC via Ethernet cable, where I can view the resulting plots of s-parameter values. If i get 15 plots of s-...
- 1
1
vote
3
answers
185
views
What Communications Technology is used in Car Reverse Cameras?
What communications technology is typically used in car reverse cameras? Analogue or digital, and what protocol? How is the data typically read into the MCU/MPU - via CSI or some other protocol?
...
- 79
0
votes
0
answers
40
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Solution to Parallel Lithium Batteries with same VSUM but huge SOC difference
I have a query regarding charging lithium batteries in parallel. I have attached 3 batteries in parallel set dip switches correctly and connected the com wire to my solar inverter. I did not connect ...
- 13.4k
0
votes
1
answer
208
views
EAGLE. Differential pair routing. Width of the track changes after first change of direction
I try to route differential pair of tracks. When I click the mouse to change the direction it also changes the width
CommunityBot
- 1
0
votes
1
answer
43
views
Error voltage feedback problem
I am trying to build a servo which is needed to complete a project I am working on.
This simple servo has an input potentiometer and the positive output voltage from this
is to be compared to the ...
- 71
0
votes
1
answer
70
views
More voltage for radio carrier frequency, is that all? [closed]
I soldered one radio circuit for a wave transmission with ~107 MHz frequency and I got good results. I simulated this circuit in LTSpice, too. What I have seen was that the wave got AM modulated and ...
- 16.3k
1
vote
2
answers
48
views
Combinatorial circuit testing with Verilator
I have this very basic combinational logic in file tb_shift_right.v:
...
- 115
0
votes
2
answers
58
views
Am I configuring the IR2104 incorrectly?
I'm trying to make a buck converter using IR2104 and IRFZ44N. The buck converter is controlled using Arduino's PWM. I'll post my schematic below.
Based on the datasheet, the HO signal will be the same ...
- 1
1
vote
1
answer
963
views
Reading and interpreting output sensitivity of a load cell from data sheet
I'm given these ratings /spec for load cell / sensor:
Range: 0-200kg
Output sensitivity: 0.7 ± 0.15mV / V
Nonlinear: 0.05% F.S
Hysteresis: 0.05% F.S
Repeatability: 0.05% F.S
Creep: 0.05% F.S/3min
...
CommunityBot
- 1
1
vote
5
answers
234
views
Proper name for "a switch-over time-delay relay"
I have a joystick wired to a relay that spins a motor either one way or the other way.
The problem is that I need to enforce a small "dead-time" when the user pushes the joystick quickly from one ...
CommunityBot
- 1
0
votes
1
answer
39
views
Low Power Lithium-ion Charge Protection
I have ~100 mAh 6 V solar cell that I want to use to charge 18650 lithium-ion battery.
Purpose is to use a PIR sensor to turn on light when someone passes by,
I am not very confident about the ...
- 13.4k
0
votes
2
answers
51
views
RS485 Communication Issue: Garbage Values on OLED Display
Hello Stack Exchange community,
I am currently working on a project involving two Arduino Nano boards connected via RS485 communication using MAX485 chips. I have set up the connections between the ...
- 3
0
votes
1
answer
28
views
How is AFCI Powered?
With arc-fault circuit interrupters once there is overcurrent or arcs what is powering the electronics inside the AFCI that are doing the signal analysis? Won't the electronics get damaged if it's ...
- 130k
0
votes
1
answer
31
views
How to plot the FFT in Ltspice?
I'm new in Ltspice and I wonder how to plot the FFT of R1? I just failed to find such a tutorial and I'm sorry for such a stupid question. Thanks for your teaching!
- 1,595
0
votes
3
answers
346
views
Connect motor in 220 VAC single phase (Line - Neutral) or in 110VAC two phases (110VAC - 110VAC "180 degree out of phase")?
I need to connect A motor of 220VAC to single phase connection :Line - Neutral(220VAC - Neutral).
In my country that doesn't exist so in my country we have this : L1-L2-neutral (110VAC - 110VAC "...
CommunityBot
- 1
0
votes
1
answer
37
views
How to model this diode in spice?
How to model this BZX79C6V2 zener diode in spice(ltspice recommended )?
reference:-https://www.farnell.com/datasheets/2303921.pdf
These are the possible parameters
https://ltwiki.org/LTspiceHelp/...
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votes
1
answer
55
views
Is it okay using IRL520n without Resistor and Diode for DIY Brushed ESC/DC Motor
In this chance, I want to know further after doing some experiments related to Logical level MOSFET (IRL520N) as a speed controller for brushed 820 DC motor for micro Arduino Quadcopter.
I had done ...
- 13
0
votes
2
answers
513
views
Change waveform into binary in Saleae Logic Analyzer
I'm using this famous logic analyzer and I would like to know if I can change the waveform into binary, like I've done in this pic (white numbers).
CommunityBot
- 1
3
votes
4
answers
1k
views
What software can I use to draw circuit diagrams like this? [closed]
Look at this beautiful circuit simulation, it is in the digital design class document that I received from my teacher.
I want to draw many circuits like that.
What software can I use to draw circuit ...
- 135
0
votes
2
answers
619
views
How to correctly supply power to multiple 12 V devices wired in parallel?
I am an artist, building a functional miniature which contains multiple devices (3 12 V computer fans, 1 cooling pump, two LED strips totauling 14 segments of three or 42 individual lights, and 1 ...
CommunityBot
- 1
2
votes
2
answers
308
views
ATmega8515 - odd results when auto-detecting external SRAM
I'm using an ATmega8515 microcontroller for a one-off hobby project. This chip has an external memory interface which can directly address 64 kilobytes of external SRAM.
ATmega8515 datasheet.
For my ...
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