Unanswered Questions

9
votes
1answer
212 views

Yields in DRAM and other Massively Redundant Processes

I'm right now combing the electrical engineering literature on the sorts of strategies employed to reliably produce highly complex but also extremely fragile systems such as DRAM, where you have an ...
8
votes
0answers
182 views

AT Commands to transmit data through TCP/IP stack with LTE network

I need to design an embedded sotfware that will drive a LTE cellular device (like u-Blox TOBY L2 Series) and its TCP/IP stack to transmit some data toward a distant server. I'm waiting for the device ...
6
votes
1answer
195 views

Trouble getting 555 timer IC circuit to work properly (Make Electronics Book Experiment 18)

I am currently reading a book titled “Make: Electronics”. This is an electronics book whose target audience is supposed to be complete beginners. One of the book exercises (Experiment 18) includes a ...
6
votes
2answers
445 views

Unable to read file greater than 2K in FatFS

I am reading a file from the SPI Flash with FATFS file system, on STM32F103 platform running FreeRTOS. I can successfully read File of size less the 2048, but if read a file file of size greater than ...
6
votes
3answers
463 views

Lithium battery consuming more power on Sleep Mode

I am trying to reduce the power consumption for PIC18F87J11 on sleep mode. The PIC is drawing about .01 mA (6 uA) on sleep mode with Alkaline AAA batteries and other power source, but when I use ...
5
votes
2answers
613 views

How to implement critical sections on ARM Cortex A9

I am porting some legacy code from an ARM926 core to CortexA9. This code is baremetal and does not include an OS or standard libraries, all custom. I am having a failure that appears to be related ...
5
votes
0answers
65 views

Wireless communication under water

I am looking for a under water wireless communication, distance up to 3000 meters. For this I quickly did some research on it and found out that Acoustic communication would be the best solution since ...
5
votes
0answers
79 views

Does the Y-Δ transform suffice for every resistor network?

Suppose I have a (finite of course!) network of resistors only. Is it always possible to calculate the equivalent resistance between any two points using only parallel, series, Y-Δ and Δ-Y (wye-delta ...
5
votes
2answers
156 views

SMPS transformer orientation with respect to PCB: what's best for EMC?

I have the option of either using a vertical or horizontal bobbin for a flyback SMPS transformer, and I can't conclusively decide which would be best for minimal radiated interference to be picked up ...
5
votes
1answer
132 views

converting induction motor winding to reluctance motor winding

I want to build simple reluctance motor for education purpose. I have couple of small 3 Phase AC Induction motor with 24 slot stator lap winded for 4 pole design. I want to convert it to reluctance ...
5
votes
1answer
668 views

Trouble with first part of Experiment 11 (Make: Electronics)

Experiment 11 from Make: Electronics Hi, this'd be my first forum post. I'm really out of options here. Let me get straight to the point. I bought the book "Make: Electronics by Charles Platt" a ...
5
votes
0answers
543 views

Trifilar Transformer Common-Mode Rejection Circuit (Signal Recovery, Hybrid Combiner, RF)

I'm trying to develop a circuit that allows me to effectively subtract two different sources of RF noise from a single signal at the same time. I am planning to use something called a "trifilar" ...
5
votes
5answers
450 views

Determining Capacitor Discharge Rate

First time poster, apologize if I accidentally missed any rules. I've built a circuit that keeps a relay closed that is attached to battery power for a specific amount of time so my Raspberry Pi has ...
5
votes
1answer
267 views

Implementation of AES algorithm using Systolic architecture

I need to generate a VLSI Systolic array to implement the AES encryption algorithm with key length of 128 bits. Following are the possible ways : Systolic for Key expansion Systolic in MixColumn ...
4
votes
0answers
69 views

Nixie tube has strange blue lights

I'm using a PCB with some nixies on it. They are driven by the KD155IC, which is a clone of the SN7441. I run them on 175V with a 10k Resistor, should give them a working voltage of 145V, 3mA. ...

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