Another question for #electronics #hobbyist people from a complete noob: This box of electronic components is all presented in plastic boxes and bags, but they're all different components crammed together.
When considering storage solutions for these bits (like the box of drawers in the second picture), do I need to account for static build-up created by the plastic bits rubbing together? I mean static buildup in the box of drawers, from the drawers rubbing against the frame.
Thank you!
does anyone have a resource on how one would go about creating an IBIS model for a device that does not have published SPICE or IBIS models?
I'm looking for info on how I would go about performing the characterisation measurements, and how I would then transform that data into an IBIS model.
it doesn't need to be super accurate and I'm not measuring particularly challenging ICs. I mostly just care about having a ballpark-correct IBIS model for SI simulations in Altium.
Never ending documentation tasks... 
I'd say it's a full-time task comparable to engine programming. #electronics
![Time Domain Reflectometry
..........................
And now for something completely different: going from the frequency
domain back to the time domain. By an inverse Fourier transform on
the existing S-parameters (without running new FDTD simulations),
``scikit-rf`` can directly calculate the DUT's equivalent transient
impulse and step impedance by transforming :math:`S_{11}` to the
time domain. This enables capturing impedance discontinuities that
are difficult if not impossible to identify using the Smith chart
alone::
# TDR requires the DC component to be physical
network_dc = network.extrapolate_to_dc(kind='linear')
plt.figure()
plt.title("Time Domain Reflectometry - Step")
network_dc.s11.plot_z_time_step(window='hamming', label="impedance")
plt.xlim([-1, 2]) # look at the first two nanoseconds
plt.show()
plt.figure()
plt.title("Time Domain Reflectometry - Impulse")
network_dc.s11.plot_z_time_impulse(window='hamming', label="impedance")
plt.xlim([-1, 2]) # look at the first two nanoseconds
plt.show()
The calculated TDR plot with step excitation shows a strong reflection
at an instantaneous impedance of 140 Ω, followed by another reflection
of 70 Ω a few nanoseconds later (the impulse excitation TDR plot is also
included here for completeness).
.. image:: images/Parallel_Plate_Capacitor_Waveguide/tdr_step_sim.svg
:width: 49%
.. image:: images/Parallel_Plate_Capacitor_Waveguide/tdr_impulse_sim.svg
:width: 4](https://misskey-taube.s3.eu-central-1.wasabisys.com/files/ff99134d-5789-4cbe-beba-c9f6e4a498c3.webp "Time Domain Reflectometry
..........................
And now for something completely different: going from the frequency
domain back to the time domain. By an inverse Fourier transform on
the existing S-parameters (without running new FDTD simulations),
``scikit-rf`` can directly calculate the DUT's equivalent transient
impulse and step impedance by transforming :math:`S_{11}` to the
time domain. This enables capturing impedance discontinuities that
are difficult if not impossible to identify using the Smith chart
alone::
# TDR requires the DC component to be physical
network_dc = network.extrapolate_to_dc(kind='linear')
plt.figure()
plt.title(\"Time Domain Reflectometry - Step\")
network_dc.s11.plot_z_time_step(window='hamming', label=\"impedance\")
plt.xlim([-1, 2]) # look at the first two nanoseconds
plt.show()
plt.figure()
plt.title(\"Time Domain Reflectometry - Impulse\")
network_dc.s11.plot_z_time_impulse(window='hamming', label=\"impedance\")
plt.xlim([-1, 2]) # look at the first two nanoseconds
plt.show()
The calculated TDR plot with step excitation shows a strong reflection
at an instantaneous impedance of 140 Ω, followed by another reflection
of 70 Ω a few nanoseconds later (the impulse excitation TDR plot is also
included here for completeness).
.. image:: images/Parallel_Plate_Capacitor_Waveguide/tdr_step_sim.svg
:width: 49%
.. image:: images/Parallel_Plate_Capacitor_Waveguide/tdr_impulse_sim.svg
:width: 4")
Dear fediverse,
what is the best resource of do's and dont's for setting up a #repaircafe ?
I guess not what I do with my own repairs : 40 boxes with half broken stuff from other people, waiting to find that single crucial part, schematic, or plans to fix it with a 3d printed part (to be designed and printed), actually converting my place in a #dumpsterdive without divers.
Neither desoldering all weird parts because weird parts are difficult to get...
#electronics #ewaste (...)
Question to all the #ee or #electronics experts here: I have two TI chips here. the one in the background is from 1985 and has shiny legs. The one in the foreground I bought in the last 5 years new from Mouser. It came with those tarnished legs already from the factory. Why are the legs so tarnished? What coating does TI use that makes it so black looking. I understand that back in the 70s supposedly TI used a silver coating that turned black over the decades, but this is something different...?
#Electronics repair Fedi, anyone got any suggestions for troubleshooting this kind of pushbutton? The device is a first-gen Kindle Touch and it has become unresponsive to both of the two wake-up buttons (front and bottom) It still takes a charge and will talk to a computer over USB so I think it's not a software or main board failure.
Both buttons are on the same daughter circuit board (pictured) and I can feel them both go click when pushed. I can't get at where the daughter board connects up without taking the device farther apart.
ooops, I did it ah-gain
I bought four more SCOOOOPES….
I have, no.
Self control.
#tektronix #retroTech #electronics #testEquipment #1960s
Can someone explain why one would design a PSU to have a full bridge rectifier installed like this? The AC pins are purposely shorted. This was found in a TekPower switching power supply (two of them). #electronics
OH: "What connector do you use for 3.3V 1100A?"
#OH #electricity #electronics
Alright, let's get the #nakeddiefriday going.
Today's exhibit is AR9281 by Atheros, a very classic Wi-Fi chip found in many devices. Comes in very pink hues. A short thread with highlights follows.
SiPron page: https://siliconpr0n.org/archive/doku.php?id=infosecdj:atheros:ar9281-al1e
Hey #electronics nerds: Does anyone know the right part number / mouser number for the @adafruit StemmaQT i2c connector? I ordered what looked right but was wrong a few times and it's surprisingly hard to figure out.
Bought some cheap-ass temp/humidity Bluetooth sensors from Xiaomi, was very happy to discover that the hardware also supports Zigbee, proceeded to immediately flash the wrong firmware file and bricked the whole thing 
Time to break out the JTAG 
Replacing the battery in pre-Retina MacBooks is easier than you might think! No glue, no fuss, just a handful of screws and a sliding connector.
Check out our MacBook battery guides to replace your own: https://www.ifixit.com/Wiki/MacBook_Battery_Replacement
#repair #MacBook #electronics #iFixit
Want to try out European manufacturing for your PCBs?
Save 10€ off your next order using the coupon code EU-PCB .
See our PCB Design rules here: https://community.aisler.net/t/pcb-design-rules/41
(Existing users can also use this code, beware the code is case-sensitive)
I got some USB-C PD trigger boards in and did a revision of my solder fume extractor to use a 12V fan and to attach the lower electronics bay much more securely now that it has a hood to keep the top shrouds together.
The 12V fan does perform better but the improvement isn't as significant as I had thought it would be. The 5V fan does a pretty good job with the hood in place.
Libre license, Libre file formats.
https://www.printables.com/model/1211096-solder-fume-extractor-v2
And just like that we have a functioning clock! currently running on a propmaker RP2040 but I will probably have to move over to something WiFi enabled before long #pcb #electronics #maker #RP2040 #RaspberryPi #jlcpcb #circuitpython @adafruit
Great talk at @hackaday Europe 2025 by Rehana Al-Soltane about how she created a flexible PCB in the shape of a crown while at MIT, using a Javascript- and web-based open-source tool
