Unanswered Questions

15
votes
0answers
452 views

Analyze My Homebrew Diplexer

I'm in need of a diplexer that'll separate RF signals from a single feedline to two antennas. What I designed and built was a diplexer that would allow ~38 Mhz and below out port 1, with ~38 MHz and ...
12
votes
1answer
260 views

All conductors exhibit capacitance, inductance, and resistance; does the same apply to memristance?

All conductors exhibit capacitance, inductance, and (excepting superconductors) resistance. Does the same apply to memristance? Do all conductors exhibit memristance to some degree? Or is the value of ...
8
votes
4answers
513 views

Selecting communication between microcontrollers at high temperature

I have been assigned to a project to find the best possible communication between several PCB boards which have microcontrollers for a specific function. I need to have all microcontrollers ...
8
votes
1answer
371 views

SDRAM initialization issue (Freescale iMX31)

I'm trying to modify an existing init sequence (low level init of SDRAM) to accommodate a change in hardware configuration: an existing SDRAM on my iMX31 was replaced with a different size, otherwise ...
7
votes
1answer
289 views

What PCB wire termination should I use for high-vibration environments?

I'm designing a system for a high-vibration application. I need to land wires on circuit boards. Someone suggested that I use a Wago cage clamp, and that there might be similar things from other ...
7
votes
0answers
852 views

SPI Seems garbled on MSP430

I'm trying to get sensible bits out of a Bus Pirate hooked up to a Launchpad board (Using the Sparkfun cable: Orange goes to P1.6, Yellow to P1.5. This should be correct, unless I have MOSI and MISO ...
6
votes
2answers
152 views

Anti-static vs. conductive vs. dissipative foam?

UPDATE: I have included some basic answers inline that I received after talking in depth with an application engineer at a foam company. I think it would still really help for someone to help flush ...
5
votes
0answers
70 views

Unable to get bootloader working on custom PCB with AT32UC3L

I have designed a PCB for a client recently, everything is fine with the hardware and software (application is working as it is supposed to). Now we are facing the need to update the program inside ...
5
votes
1answer
333 views

EMI Filtering on LVDS lines

This question is slightly related to: What's radiating on my PCB? These are Beckhoff's EtherCAT industrial IO modules. Each module is connected to its neighbours by 100mbps LVDS. Each module contains ...
5
votes
4answers
684 views

Determining phase sequence in software

We have 3-phase electric network. How to determine phase sequence (L123 or L132) from 2 line-to-line voltages U12 and U32? I prefer computationally simple solutions. Is it possible to determine phase ...
5
votes
1answer
330 views

Serial data transfer from Omega DP80 legacy hardware to computer

Can anyone provide me with some guidance on setting up a legacy serial connection on an Omega (brand) thermocouple display? I would like to use the serial data interface (Omega DP80-Ser) to reliably ...
4
votes
1answer
71 views

Wheatstone bridge sensitivity and accuracy

From my earlier question I was able to wire up 2 SEN-10245 weight sensors (each forming one half of a wheatstone bridge) with an AD620 InAmp & 47 Ohm resistor (to set the gain to ~1000). I then ...
4
votes
2answers
53 views

Simple RFID reader - AM demodulator not working

I'm currently working on building my own simple RFID reader. I've already build a small circuit in which my coil is fed from 5V current source or is connected to ground dewpending on the 125kHz square ...
4
votes
1answer
85 views

Which photo sensor should I use in dust prone areas?

I am trying to automate the street lights near my house by using a photo sensor. But before even starting I thought of asking if there is any way of sensing light in dust prone areas, since I don't ...
4
votes
0answers
128 views

Optimal Placement of LED's

Not necessarily electrical, more engineering; I'm trying to build a UV LED exposure box to aid in the PCB etching process. There are plenty of guides around, but they all seem to involve haphazardly ...

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