Unanswered Questions

10
votes
2answers
2k views

How to implement critical sections on ARM Cortex A9

I am porting some legacy code from an ARM926 core to CortexA9. This code is baremetal and does not include an OS or standard libraries, all custom. I am having a failure that appears to be related ...
8
votes
0answers
171 views

GaN pulsed operation

Does anybody have experience biasing and pulsing a microwave GaN HEMT? I've just ordered a 10 Watt S-band transistor. I know all about bias sequencing. This application is pulsed. I've read about ...
8
votes
1answer
626 views

Typical zero sequence data for 80MVA transformer

I need to model a 80MVA transformer 132/33kV built in 1973. There is very little information on this transformer but I need to populate certain values in the model. Where can I find typical zero ...
7
votes
0answers
239 views

How can a USB-RS232 converter manually assert its TX pin?

I honestly don't know if this is a Electronics Stackexchange or Stackoverflow question, but I'm posting here because this is related to an electronics project of mine that has been giving me pain for ...
7
votes
1answer
178 views

TMS320 Floating Point (Texas Instruments DSP from '98)

Background Is there anybody here who is an EE with programming experience who has worked with the Texas Instruments TMS320 C3X-series DSP? I am currently doing some work with the C3X for a project. ...
6
votes
0answers
67 views

how to Design Rule Check an Eagle file in a git hook?

I can't find how to launch the ERC and DRC from the command line in Eagle. My hope is putting the command in a git pre-commit hook. I'm perfectly ok with using a third party program or library if ...
6
votes
1answer
65 views

Circuit feedback with mutual inductance on a toroid

I have been reviewing a circuit for the past few days and I am hoping to get some feedback to verify my thoughts as to how the circuit is working. This is a driving circuit for an ultrasonic cleaner ...
6
votes
1answer
451 views

Error interfacing GSM sim900 with atmega32

Hi all I am trying to interface GSM SIM900 with atmega32. I have a written a code in which if a user press a push button, a call will be made to a pre defined number. If we want to change the pre ...
6
votes
0answers
120 views

How reliable is a daisy-chained USB bus? What are the risks and how can they be minimised?

Introduction USB has been around for quite a long time now, used extensively even in the automotive, marine and space industries to some extent. However certain communication ways are more reliable ...
6
votes
0answers
1k views

ASIC timing constraints via SDC: How to correctly specify a multiplexed clock?

Introduction Having found multiple, sometimes conflicting or incomplete information on the internet and in some training classes about how to create timing constraints in SDC format correctly, I'd ...
6
votes
1answer
3k views

Msp430g2553 i2c communication library with itg3200 gyroscope

I've been creating an I2C library for communicating with ITG3200 gyroscope for MSP430g2553 experimental launchpad. I still have slight problems with sequential reading and the signed values but I'm ...
6
votes
1answer
3k views

USB CDC-ACM Class Driver on STM32F4

Simply my project is to connect a Huawi USB modem to my STM32F407 Discovery board, and start using AT commands to send text SMS. so here is what I've and what I want :) I've OTG USB capability on ...
6
votes
2answers
160 views

To pulse or not to pulse

It is accepted practice to maintain lead acid batteries at a float voltage of roughly 2.3 Volts per cell .The precise value depends on battery type and battery chemistry and ambient temperature .We ...
5
votes
0answers
61 views

Blasting copper off a substrate with a 808nm laser diode- viability

So, I'm working on a way to produce PCBs for small jobs, and I thought that lasers might be a good way to go, as etching seems to be very difficult from small traces, needed for many microcontrollers. ...
5
votes
0answers
101 views

Lack of color displaying composite video

I'm attempting to output video from a TMS9118 VDP to a television's composite video port. Right now the result I'm getting is grey scale (whereas the background should be green), and I have no idea ...

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