Posts by Elleanor Lopez
It was a firmware issue. SDS1xx4X-E Firmware Revision History And Update Instructions The hardware delay between ADC acquisitions was not accounted for. I flashed the scope with new firmware and ...
You have mentioned a few points yourself, so I will try to comment on those points and perhaps suggest some reasons to add or not to add a ground plane. You mentioned twisting (I suppose warping) ...
First I noticed that clock begins before chipselect gets pulled low on SPI. After eliminating potential sources I started to suspect the scope. I connected all 4 channels to function generator at d...
I was watching a video from EEVBLOG about bypass capacitors, and he presented a theory that randomly connecting different values of capacitors in parallel can create unexpected impedance spikes: ...
ADE7933 contains an isolated DC-DC converter (Page 82). The control uses ~1MHz PWM signal with unknown rise time, but assuming something like 10ns, most of the energy would be contained in the 35MH...
In the AM2224-1000 datasheet for the '1000' model the following parameters are given: Nominal voltage per phase: 1.4V Back-EMF amplitude: 3.8V/k step/s There is also torque/speed gra...
Hi, I am designing a system using STM32WB55CEU6 and I want to use the RF functionality. Looking at evaluation board I see that there is a matching network for the output pin. The datasheet does no...
Do micro-RF connector mating crimp connectors are ever sold separately together with a crimp tool? For example this I have looked through a lot of pages, and can only find PCB connectors + cable a...
Hi, I was watching Many EMC Tips to Help You Design Better PCB Boards (with Keith Armstrong) and at 1:01:30 timestamp he talks about bonding reference plane to chassis and emphasizes that the conn...
Looking at Flex-Rigid PCB technology vs Flex PCB with added stiffeners under sections with components I struggle to see the advantage of Flex-Rigid for low layer counts, as it seems more complex to...
In many hobby and even commercial designs, people use generic wire-wound inductors or common-mode chokes that do not have a specified insulation or hipot voltage rating. Drum-core inductors are som...
The typical GPIO protection circuit can be seen here: In most articles online this type of protection just boils down to 'excess current is dumped into the VDD rail'. However, where does it actu...
I want to use ADG726 multiplexer for an application where the multiplexer inputs could have potential on them before ADG726 is powered up. Seeing that ADG726 is a CMOS device, it seems it might be ...
Looking at Texas Instruments opamp OPA2211it mentions GBW of 80MHz at a gain of 100, and 45MHz at gain of 1: Looking at the bandwidth graph from Figure 10 in datasheet: It looks like 80MHz is...
Rosenberger 23C25D-40ML5 specifies 500V RMS rating: Looking at the recommended landing pattern you can see that the distance between the signal landing pad and housing of the connector is 0....
Some gentlemen decided to throw a hook with wire over 750kV lines in Belarus. They survived, however, I find in interesting to find out why. Assuming the connection to Earth was solid, there would...
I was looking for guidelines of how to select appropriate cables for applications (I am interested in DC), I found IEC 183 standard which talks about high voltage cable selection for AC. Also, the ...
Olin's answer lead me to look for illustrations and I found a reference around creepage definition in IEC 62368 to another IEC norm, namely IEC 60664-1: "Insulation coordination for equipment withi...
I got an answer regarding the back-EMF number in the datasheet. The back-EMF voltage waveform is a sine and the listed value is the peak value. What this means in practice is that energy can still ...
The submarine built by OceanGate went missing on 18th June 2023. A lot of online criticism was directed towards the control hardware of the submarine - Logitech F710 controller. However, why i...
The TESATRONIC TTD20 is a precision length measuring instrument used in various industrial and laboratory settings. On the backside it provides a 15 pin interface for reading out signals: I want...
From IEC-62368 for signals below 30kHz the creepage distance for pollution degree 2 and material group IIIa,IIIb (FR-4 boards are IIIa) at 40V is specified to be 1.1mm. We have a connector that has...
I am looking at this RF connector. I see that insulation resistance and breakdown voltage are specified, but no voltage rating: I have two questions, one functional and one safety. Functionally...
For my own understanding I tried modelling switching off an inductive load without a freewheeling diode to observe ringing. This is the model I used: 1.) Are the two main components of the reson...
Noise can be coupled between signal lines through parasitic capacitance formed between these signal lines, as $i = C\frac{dv}{dt}$ where C is the capacitance between the signal lines. Another wa...
