Electrical Engineering Weekly Newsletter - Monday, June 29, 2015

Top new questions this week: Why is my circuit so incredibly sensitive to electric fluctuation? I recently finished building a circuit showcased in a beginner's electronics book. I have included the picture of my creation below because I think it may become relevant to the question. At the ... power-supply integrated-circuit stability   asked by T555 52 votes answered by Asmyldof 47 votes How to Transition from "Basic" Microcontrollers to ARM Cortex? I have many years of experience with 8-bit cores from various manufacturers - namely 8051, PIC, and AVR - and I now have a Cortex M0 to figure out. Specifically this one, but I hope we can be more ... microcontroller arm datasheet documentation cortex-m0   asked by AaronD 14 votes answered by Adam Haun 29 votes Why are vias bad? I am designing a PCB with EAGLE and saw that it was trying to limit the amount of vias through the PCB. Why do you want less vias? Why are they bad? Do they bring extra manufacturing cost or is it ... pcb pcb-design low-power pcb-fabrication via   asked by rhbvkleef 14 votes answered by Bence Kaulics 10 votes Is it proper to use an internal layer as a heat bed if I want to warm my multilayer PCB? I need to design a circuit to warm my PCB. There are many ways to build up such circuit. But I learned from a post "Warming PCB in a low temperature environment" that maybe I can use traces as heater. ... pcb temperature heat trace pcb-layers   asked by billyzhao 12 votes answered by Spehro Pefhany 5 votes 1.5V-rated MOSFET doesn't react to a gate input of 1.8V I am not really an electronics specialist, but a software engineer (so excuses if I 'm asking stupid questions). I am trying to use a microcontroller GPIO output rated at 1.8V. When this pin becomes ... mosfet gpio   asked by user2796104 9 votes answered by Lorenzo Donati 15 votes Inbuilt flash memory size not enough I am using TM4C1230C3PMI controller from Texas instrument in one of my project. It has 32KB of internal flash, which is not sufficient for my application. Higher flash sized micro-controller are ... microcontroller programming memory flash eeprom   asked by Sanjeev Kumar 9 votes answered by corecode 16 votes Why do we use 32.768 kHz crystals in most circuits? Why do we use 32.768 kHz crystals in most circuits, for example in RTC circuits? What will happen if I use a 35 or 25 kHz crystal? I assume because the IC internal Xin, Xout pin circuitry should be ... oscillator crystal   asked by FEB1115 8 votes answered by WedaPashi 15 votes Greatest hits from previous weeks: Why use PLC instead of microcontroller? Why does everyone use PLCs in industrial environments, instead of a microcontroller based solution? For a longer task, the PLC program is as complicated as a microcontroller program. A ... microcontroller plc   asked by Saneesh A T 32 votes answered by daniel 21 votes What is input and output impedance of an opamp? I have never understood input and output impedances of an op-amp. If anyone can explain what these two terms mean in an op-amp I'd highly appreciate it. Thank you! ... op-amp impedance   asked by user734861 15 votes answered by Phil Frost 22 votes Can you answer these? ESP8266 Connecting slowly and hanging I was trying to send GET request from a webpage to ESP8266. Everything works fine in the first connection and closes successfully, but during the second connection when I am trying to close it with ... esp8266 networking   asked by Jem 1 vote Fpga Crossing signals between related clock domains I have an fpga design with two clocks, one is 54MHz and the other is a divide-by-4 clock of the 54MHz, this is 13.5MHz clock. The 13.5MHz clock is generated by dividing the 54MHz clock in vhdl, and ... fpga vhdl   asked by JakobJ 2 votes Quasi-peak detector This is the circuit of a quasi-peak detector: simulate this circuit – Schematic created using CircuitLab where \$ V_{sig}\$ is the input signal. When the diode is open-circuited, the ... capacitor emc charging discharge detection   asked by BowPark 2 votes

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