• Recent
  • Compose
  • Select the "Compose" tab to start a new discussion

TUTORIAL - Example 1, Using Femm to Calculate Component Values of Simple Microstrip to use in LTspice/PSpice

Started by RobertMacy in sci.electronics.design41 minutes ago 23 replies

I offer to share with you a TUTORIAL but don't know how to get it into your hands. The TUTORIAL is about 15kB, zipped, and describes the...

I offer to share with you a TUTORIAL but don't know how to get it into your hands. The TUTORIAL is about 15kB, zipped, and describes the step-by-step process of using FREE femm 4.2 to analyze a simple PCB structure to calculate values to then use in circuit simulation, LTspice/PSpice. The sequence can be modified for use in analyzing really complex structures, structures where th...


So, finally got the GPS and sensors working as webserver on Raspberry

Started by Jan Panteltje in sci.electronics.design53 minutes ago 4 replies

So, finally got the GPS and sensors working as webserver on Raspberry http://217.120.43.67:8073/view_sensors.php As usual I removed the lat...

So, finally got the GPS and sensors working as webserver on Raspberry http://217.120.43.67:8073/view_sensors.php As usual I removed the lat lon, against drones. The sensors are now sitting on the table, waiting for an ebay connector so it can go in the green box. http://panteltje.com/pub/rgpspc_sensors_IMG_4810.JPG The link may or may not be up in the future as I am programming and te...


1e6 = 1e9

Started by John Larkin in sci.electronics.design57 minutes ago 70 replies

Why is it that journalists feel free to exchange "million" and "billion" ? I was just reading that two 40 foot diameter pipelines in...

Why is it that journalists feel free to exchange "million" and "billion" ? I was just reading that two 40 foot diameter pipelines in California, that will carry water from the Sacramento River to as far south as San Diego, will cost 15 million dollars. -- John Larkin Highland Technology, Inc picosecond timing laser drivers and controllers jlarkin att highlandtechno...


AoE 3 (power MOSFETs in parallel)

Started by RBlack in sci.electronics.design58 minutes ago 26 replies

I'm slowly working my way through AoE 3, lots of excellent stuff so far, and came across 3.6.3, running power MOSFETs in parallel in linear...

I'm slowly working my way through AoE 3, lots of excellent stuff so far, and came across 3.6.3, running power MOSFETs in parallel in linear mode. I know this has been discussed here in the past and the consensus was that it can't be safely done with regular vertical MOS devices without ballast resistors or some form of active current sharing. Fig 3.117B looks like a neat trick, whic...


little pcb-mount CTs

Started by John Larkin in sci.electronics.design2 hours ago 57 replies

Anybody know of a source for a small (1 amp range) PCB mount current transformer? Frequency will be around 400 Hz. There are switcher...

Anybody know of a source for a small (1 amp range) PCB mount current transformer? Frequency will be around 400 Hz. There are switcher current sense CTs, but I don't know if they will work that low. Or maybe I could use a shunt and a voltage-mode (audio) transformer. -- John Larkin Highland Technology, Inc picosecond timing precision measurement jlarkin att highlan...


I'm thinking about letting the taxpayers subsidize me.

Started by amdx in sci.electronics.design2 hours ago 14 replies

I just got the latest notice of increase on my non Obamacare healthcare policy. It is only 9% this year versus previous increases of 18.8%,...

I just got the latest notice of increase on my non Obamacare healthcare policy. It is only 9% this year versus previous increases of 18.8%, 21% and 19.4%. I have a good policy, with a $10k deductible, if it wasn't good,I would have already been forced onto Obamamcare. The new premium is $8448 a year for a family of three. Comparing a similar Obamacare policy, the premium is $17,508. ...


wierd opamps

Started by John Devereux in sci.electronics.design6 hours ago 21 replies

Linear seem to have some new "interesting" high impedance, high-speed, low capacitance opamps LTC6268 and LTC6268-10. "500MHz"...

Linear seem to have some new "interesting" high impedance, high-speed, low capacitance opamps LTC6268 and LTC6268-10. "500MHz" http://www.linear.com/product/LTC6268 "4GHz" http://www.linear.com/product/LTC6268-10 (but what's with the current noise plots?) -- John Devereux


CMOS checksum fails

Started by Skybuck Flying in sci.electronics.design6 hours ago 27 replies

Not sure what could be causing it. Seems to happen after power loss... and hard reset... also after weird electrical problem which happens...

Not sure what could be causing it. Seems to happen after power loss... and hard reset... also after weird electrical problem which happens rarely, which is solved by full power down, disconnect of cables etc. After saving settings and exiting bios, PC works as normal. Checksum error indicates some bits flipped ? What exactly is checksummed for CMOS ? Bye, Skybuck.


Damnit, Joerg.. :)

Started by Tim Williams in sci.electronics.design6 hours ago 15 replies

You recommending pizza on the grill so highly, I tried it today. Works fine, except the bottom is burnt to blackness! At least it's...

You recommending pizza on the grill so highly, I tried it today. Works fine, except the bottom is burnt to blackness! At least it's salvageable after scraping it off... I guess the lesson is, thin crust only. I usually make normal crust (take a blob of soft, risen dough, smoosh it out, add toppings), which takes the better part of an hour in the oven. Tim -- Seven Transistor ...


Paper on reducing 1/f noise in amplifiers

Started by Phil Hobbs in sci.electronics.design8 hours ago 3 replies

AoE 3 P. 485 (footnote 22) references a paper by Broderson, Chenette & Jaeger, entitled "A Superior Low Noise Amplifier", 1970 ISSC, P. 164....

AoE 3 P. 485 (footnote 22) references a paper by Broderson, Chenette & Jaeger, entitled "A Superior Low Noise Amplifier", 1970 ISSC, P. 164. Before I feed yet another $31 into the voracious maw of the IEEE, does anybody have a copy handy? Thanks Phil Hobbs


Sign up
or Sign in
?>