13,366 questions with no upvoted or accepted answers
308 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 ...
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 ...
442 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, ...
416 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 ...
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 ...
566 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 ...
158 views

### Failure of LEDs in the wet — what's going on at the semiconductor level?

Recently I've come across two very different LEDs that have failed due to a soaking, but with interesting and almost identical failure behaviour. I'd like to understand what's going on inside. Once ...
287 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 ...
429 views

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 ...
652 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 ...
720 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 ...
381 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 ...
403 views

### Simulate Earthing in LTSpice

I wan to simulate earthing or frame ground which is separate from circuit GND in LTSpice. I want to simulate line filter using Y capacitors C2 and C3 in the below image. See below image for clarity. ...