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I'm evaluating the MTBF for a relatively new smd electronic design. It's not something I've really done before myself.
So I've been going through the MIL-217 reliability spec, and evaluating some software and online calculators.
I thought I'd start with the component 'count' type then...
I'm wondering if I can get some help interpreting a part of the ATEX standard (IEC 60079-18)?
I am designing a PCB for ATEX certifcation, encapsulated type 'mb'.
Under 18.104.22.168 'minimum distances' (page 23-24) there is a table (5) and diagram (figure 2) of the PCB stack-up.
In my case, from...
Could someone please help me with a problem.
I have a PCB that fits in an ABS box and is to be completely potted, top and bottom.
I am investigating device failure modes, as I need to ensure that the outside surface temperature does not reach 135C.
I've worked out that one SOT23 device may...
I'm relatively new to VHDL and I wonder if someone could have a look through this bit of vhdl code. The FPGA is a A42MX09, the IDE is libero.
I have simulated the code, before and after synthesis and it appears fine. Synthesis does not show any errors.
Basically it's a serial data stream...
I am working on a PCB which is going to work at 240Vac mains. I am struggling with creepage and clearance distances, so
the only answer I can see is to put the mains Live and neutral on inner layers.
I have looked at the spec and see that the clearances for an inner layer will be >0.25mm...
I wonder if someone could help with this question.
What is the breakdown voltage of solder resist. I have seen a value of 500V-1000V/mil.
So can solder resist be relied on to reduce the track distance between 240V mains live, neutral and earth.
If so what would be the minimum track...
Could someone help me with a problem I am looking into regarding a lossy transmission line (again)
I want to manually calculate what the attenuation and output voltage I should expect for an lossy unmatch cable. I have been using Multisim simulate it, (I have attached a screen dump), but I...
I wonder if someone could tell me if there is a formula I can use to work out what the DC voltage / average voltage will be in the circuit.
(A half way rectifier connected to resistor divider, and a smoothing capacitor on the output of a divider)
I think I should be able to work it out, or...
I have another simple question, I hope someone might be able to help me with.
When cable manufacturers specify the cable inductance per Metre, (specifically for single pair or multi-pair type, i.e NOT coxial) are they generally specifying a complete loop inductance (i.e for 1 pair shorted...
I wonder if someone could answer this question. It's probably quite simple but I just want to check.
I am working on send some AC communication signals down long cables.
One particular type of cable has a parameters that specifies an 'L/R ratio' (60 uH/ohms) instead of giving a...
I wonder if someone could help with a question I have.
I am investigating standing waves on signal (100KHz-200Khz) sent over on long cables, over 1km -3Km.
Ultimately with a known load and source impedance and the details of the cable, I need to be able to predict what the signal level...
I would really appreciate it if someone could help me. (Sort out some confusion :-))
I am intending to use the 74hc4046 to demodulate a FSK signal. The carrier centre frequency is around 165Khz and the deviation is around +/-2.5%. So I am using a frequency offset. (I am not using any...
I am wondering if anyone has come across a device that is similar to the power line transceiver LM1893 /
LM2983 from TI which is now absolete.
I realise that has been partly answered before. Unfortunately as far as I can see, I can't really use the other devices that were suggested. Most...
I have a general question about the standard model used for cable lossy transmission lines.
I am looking redesigning a product that drives a signals down very long cables, ie could be well over a kilometre and various configurations. (Ultimately this is due to IC obsolecence). The...
I hope I have posted this is in the correct forum as I believe it is a hardware problem with a device that I need help with.
I am investigating an intermittent problem that has baffled me. The specific device, 28SF040 512K x 8bit flash memory device, is manfactured by SST. Though someone may...