Unanswered Questions
29,154 questions with no upvoted or accepted answers
6
votes
0
answers
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Understanding EGSM-900 (LTE 8 band) electromagnetic spectrum
I am trying to fully understand the physical layer of the GSM standard. For doing that I am looking at the E-GSM-900 band (mostly used in Europe). In my country these frequencies has been assigned to ...
- 185
6
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How to protect single cell Ni-MH battery (overcurrent, undervoltage, overtemperature, etc.) during discharge?
Story
I am designing a boost converter for a battery powered board. I am planning to use single Ni-MH battery. The needed output voltage is 3V3. The device will be in deep sleep mode (drawing few ...
CommunityBot
- 1
6
votes
1
answer
7k
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RGBHV (VGA) to YPbPr Converter and Waveforms?
Purely for hobby, I am working on an RGBHV (VGA) to YPbPr (Component) converter circuit for old games consoles modified to output RGBHV on a VGA cable. From the game consoles, the RGB signal is taken ...
CommunityBot
- 1
6
votes
1
answer
1k
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Ethernet magnetics, discrete vs integrated: inductance value
I recently made a change to an EtherCAT-over-Ethernet design, where I moved from using an RJ45 with integrated magnetics to a low-profile connector with discrete magnetics because of size constraints.
...
CommunityBot
- 1
6
votes
1
answer
6k
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Run IAR Program without Debugging
I'm having a simple problem with IAR Embedded Workbench, programming an STM32 using an ST-LINK/V2 programmer. I'm trying to run a program that temporarily switches off the JTAG pins, so I can't run it ...
- 1,414
6
votes
1
answer
592
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Charge mode piezoelectric signal conditioning
I have a charge-mode piezoelectric dynamic pressure sensor (datasheet link) that I want to read a signal from. If you look at the datasheet it says the sensor outputs are in a balanced and floating ...
5
votes
0
answers
114
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What's wrong with my bread maker?
I'm not sure if that's a place I can ask this question. I've got a 10 years old bread maker, that I've used about 50 times.
2 weeks ago, upon turning it on, everything looked and sounded usual (screen ...
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5
votes
1
answer
185
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Measuring Ethernet Impedance
I have a PCB, which was not designed by me. The Ethernet works intermittently between multiple copies, except for on one, where it works just fine.
I want to start troubleshooting at layer 1, and when ...
- 84.8k
5
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118
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Why does output of this reverse bias noise source not have normal distribution?
I am trying to build a noise source based on reverse biased PN junction (i am trying to replicate this project https://altusmetrum.org/ChaosKey/ ). At this point i tried multiple iterations but so far ...
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5
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369
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How to match an edge launch SMA connector to a pcb with coplanar waveguide with ground?
I'm trying to develop a pcb that is capable of handling signals over 6GHz and created a test board to see how the pcb and connectors perform. The pcb is a relatively low-cost 4-layer FR-4 TG155 board ...
- 123
5
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101
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Circuit with resistance equal to input resistance
I want to use a digital potentiometer, however, the digital potentiometer has a power limit, which means I can't apply the voltage for my application.
I am looking for a circuit which functions as an &...
- 9,270
5
votes
1
answer
1k
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Is my understanding of DRAM memory array topology in relation to "rows" and "columns" correct?
Assume a x16 DDR SDRAM module with 2b banks, which are made of 2r rows, which are further composed of 2c columns, where each column is 2w bits "tall". Assume that the interface is burst-...
CommunityBot
- 1
5
votes
2
answers
518
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Help identifying Hall sensor (95B2h)
I am trying to identify a Hall-sensor located on a keyboard. There is one of these sensors underneath every key. One of them are broken and needs replacing. However, I cannot identify the component.
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5
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answers
336
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Bidirectional flyback converter design
I see a fair amount of questions on here about designing flyback converters, but I don't see any about designing a bidirectional DC/DC flyback converter, such that either side can be the primary and ...
- 9,270
5
votes
1
answer
101
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Do I need a clock crossing circuit for signals clocked by mirrored PLLs?
Assume that within an FPGA, I have two data streams that are being driven by two clocks. The two clocks are generated by 2 physically separated PLLs (still within the same FPGA), both of which have ...
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