Unanswered Questions

3
votes
1answer
76 views

How to measure self resonance frequency of coil using CRO?

I have antenna coil for tuning an antenna. I want to measure self resonant frequency of the antenna coil. Can anyone tell me how to measure it with an oscilloscope? What will be the experimental ...
2
votes
2answers
132 views

Buffering/matching large signal to drive 5 ohm capacitive load at 13MHz (RF)

I built a Pierce oscillator that generates 13.5MHz @ 7Vpp signal from a V_cc=12V. But I need to drive a capacitive load of 5 ohms @ 6Vpp. I'm not sure how to do this. First I need a buffer to prevent ...
2
votes
2answers
257 views

How should Ground vias be placed?

I am using vias to filter the input power. The following to pictures show two ways of placing vias. I think both of them are inappropriate since the vias are not "fully" connected with ground through ...
1
vote
0answers
21 views

Controlled supercapacitor charging with buck converter

I'm building a charging circuit for two supercaps (2.7V, 3000F each) in series. I've got a 12V supply and a buck converter rated to 15A, which I've set to provide 4.8V. I'm using balance resistors to ...
1
vote
1answer
21 views

Assigning mechanical layers in Altium

I've just recently started designing my first PCB using Altium but am confused with the mechanical layers. I have a 4-layer board, and am placing components on both the top and bottom side (Through ...
1
vote
1answer
23 views

“Buffering” spikes between switch positions

I'm using a 6 position 2 pole rotational switch to change the resistance of two input voltages. Each position adds a resistor on each input, thus increasing the overall resistance and lowering the ...
1
vote
2answers
2k views

How can I tell that USBasp is working?

I have the USBasp programer and I'm trying to burn bootloader on Atmega328 so that it can be used as a replacement chip in Arduino board (replacement chips with the bootloader installed are quite ...
1
vote
0answers
463 views

How can I stop MPLAB X from hanging between build and program?

I've been using MPLAB X and XC16 to build and program projects for a dsPIC 33EP128MC506 for about a year now. For the last two months, I've seen some new and unusual behavior on two separate machines. ...
0
votes
0answers
4 views

Connect a bipolar stepper motor to a breadboard

I would like to connect a bipolar stepper motor, with a connector as the one in the picture, to a breadboard. Is there any adapter I can use?
0
votes
0answers
9 views

Read data from Parallel Port (LPT) with Arduino

I am newbie to Embedded... Short Question : I just want to know is there is any way to read data from LPT port (ie: DB25) with Arduino ? Long: I have an requirement to transfer M/c printing data ...
0
votes
1answer
9 views

MX-FS-03V one transmitter to many recivers

I want to use MX-FS-03V RF module as single transmitter to many receivers. As this module sold as pairs i dont know if this works or not or any trick to do this. i think the screw on the module ...
0
votes
1answer
12 views

Interfacing with a graphic lcd

I am ordering a graphic lcd NHD‐12864AZ‐FL‐YBW and most of the interface code seems pretty simple. On the datasheet it has the following list of commands I don't understand what is put in the write ...
0
votes
0answers
11 views

Motor noise interfering with I2C

I built a robot using the Arduino Due with all the sensors running at 5V over I2C. There is a level shifter on both I2C lines. The motors are controlled using a VNH5019 motor driver carrier from ...
0
votes
0answers
15 views

Porting Contiki to LPC1347 microcontroller

I am working on creating a port for Contiki-OS on LPC1347. These are the problems i am having. There is no gcc compiler for lpc1347. I have tested the board using lpcXpresso only. Any idea where i ...
0
votes
1answer
6 views

How to view voltage graph in simulink

I am trying to simulate Synchronous Buck DC DC converter I have created the circuit now i want to test it to check whether it is giving me the correct output or not , I have tried the same circuit in ...

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