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Unanswered Questions

12,762 questions with no upvoted or accepted answers
14
votes
2answers
5k 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 ...
14
votes
1answer
226 views

Trying to identify threaded round 2-way power connector on a radio

I'm trying to find a power connector for a Maxon DM200 Mobitex radio terminal. As far as I'm aware, the part of he manufacturer who made this radio closed down some years ago, and there's no support ...
11
votes
2answers
2k views

DRC tool for Gerber files

Do you know any tools which perform design rule checking for Gerber files of PCB and are suitable for using in batch mode on a remote server? Something similar to what BatchPCB or FreeDFM uses (I ...
9
votes
1answer
369 views

Increasing the compliance voltage range for a variable, two-quadrant constant current pin-driver circuit

The following is for hobbyist work and I have no commercial intentions at all. Only a handful (two?) will be built. (I use these for part testing and curve generation, though with the higher voltage ...
8
votes
0answers
229 views

Old equipment to identify

I volunteer at the Dauphin Railway Museum in Manitoba, where we recently received a donation of equipment collected by CNCP Telecommunications in the 1970s and earlier. Most has been identified, ...
8
votes
2answers
211 views

The use of redundant I2C in spacecraft avionics

I recently read this report about the JPL x2000 avionics development project, which developed more modular avionics platform using commercial silicon, to cut cost and power. They opted for an ...
8
votes
7answers
443 views

Practical ways to obtain Bode plots for an unknown circuit

I want to use a practical method/way where I can obtain roughly the Bode plot of a system especially a filter. This of course can be done by using complex math or implementing the circuit in a SPICE ...
8
votes
1answer
417 views

FSInit() - “CE_BAD_PARTITION”

I am using a PIC18F26K80 and an XC8 compiler. I am trying to initialise an SD card and create a file. I have simply formatted the SD card on Windows to have a "FAT32" file system and an "Allocation ...
7
votes
2answers
610 views

Is it really necessary to manually clear the XMEGA timer overflow interrupt flag?

As some of you may know, Atmel provides a software framework (mainly as part of Atmel Studio) that provides drivers and examples and is updated on a more or less regular basis. In a recent update ...
7
votes
2answers
611 views

Flash memory data retention time

I'd like to buy one of those after market Android car head/infotainment units. But I don't think there's a way to reinstall the system software if it gets corrupted, so I'm concerned about how long ...
6
votes
0answers
98 views

Limited blind via pairs - Use for power or for signal?

I'm working on a PCB with 0.4mm WLCSP's and 0201 discretes. It will have components on both sides. The routing is very tight; I can't use a simple plated through hole ("PTH") design. I'd like to ...
6
votes
1answer
299 views

Minimizing(optimizing) digital logic circuit with multiplexer(s)

(this by the way was an exam question) For \$F = \sum m(2, 3, 5, 7, 11, 13)\$, I am trying to implement a digital logic circuit using only the following: 2:1 MUX (cost: 12, and must use at least one ...
6
votes
1answer
231 views

How are these “Programmable Oscillators” programmed?

I came across the SiTIME SiT8008B field programmable oscillators and their programming device. What I can't seem to find is an explanation of what the programmer is doing to the "blanks" to set them. ...
5
votes
1answer
143 views

Why does the op amp output in this circuit have low slew rate?

I have the following circuit on a bread board (with the exception of using AD820 instead of AD822 - the main difference based on the datasheets seemed to be one versus two op amps in one package). ...
5
votes
1answer
105 views

Routing large RF trace to small SMD pad

I am designing an RF board in Altium where due to the dielectric selected and its thickness, the trace width for a 50 ohm characteristic impedance is thicker than some of the SMD component pads. What ...

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