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H: Step down transformer without coil?
Isn't it possible today to make a down-transformer without coils, without the idea of induction? After all, the AC reaches every voltage in-between, so all we have to do is keep cutting the power flow and only letting current pass when the wave is at the desired voltage. Of cours... |
H: Diagram symbol for an inductance with a neodymium magnet as a core
I want to know if there is such a symbol (i.e. an electrical diagram symbol for an inductance with a magnet as a core). If such is the case how is it specified the orientation of the poles of the magnet?
Thanks in advance
AI: Schematics are Logic ... |
H: How to detect a heat emitting object in a distance from 10 - 50cm?
If I have a heat emitting object like a heater, radiator or hot cup of coffee, what sensor can I use to detect it by the fact that it is emitting heat?
I have hc-sr04 sensors but they use ultrasound and so are not suited to this. I have found this i... |
H: Fight inrush current with PTC, good go or not?
To power an amplifier, I use a lipo battery 3.7v (4000mah) or two 18650 batteries 3.7v (4000mah) in parallel with a DC/DC boost converter that boost the voltage to 24.2 volts. The circuit performs pretty well.
On the load side (output) of the DC/DC converter I use a 25... |
H: Op-Amp Voltage Regulator
I'm building a linear voltage regulator using the LM 741 (part of school project) but everytime I connect a load than draws more than 1A the output voltage drops down. I'm not sure why this happens and what can I do to solve this ?
AI: The TIP31C gain is not very high. In the ST datasheet, ... |
H: Reflow oven vs even hot plate
I've recently been searching for a simple, easy yet cheap way to reflow SMDs on a PCB board as I have never tried it before and always wanted to create a small and compact circuit. I then found a crowd funding campaign (whom I will not currently name because my point isn't to advertise... |
H: How do you determine the approximate frequency where the magnitude starts decreasing -40dB/dec for complex pole?
I am stuck at drawing the approximate Bode plot for the complex pole transfer function as below.
Please see the question and problem in the picture.
How do you determine the approximate frequency where ... |
H: RTC Alarm deepSleep STM32L073RZ
I'm trying to configure 2 differents Alarms on my STM32L073RZ to leave the deepSleep mode but unfortunately after the first wakeUp the memory is reset and the second alarm never wakeUp the STM32. My first alarm is 30seconds after the power On of the board and the second 2 minutes aft... |
H: 12V LED dimmer burning out after several weeks of usage
We have changed the lighting in our room, but after several weeks the dimmer just puffs in smoke and stops working. This already happened twice.
Basic setup is like this -> 2 way switch goes to 220->12V transformer (meanwell 12V 5A) -> to dimmer that burns out... |
H: Differences between Interrupts and sampling for hardware button?
I have a hardware button I connected to an interrupt, but my problem is it bounces a bit, making the button press unreliable. I think a good deal of these issues would be solved by sampling in the main loop, but that just feels technically wrong.
Are ... |
H: What is the difference between electrical engineering and electrical engineering technology?
I have recently found that someone can get a BS. in Electrical Engineering and a BS. in Electrical Engineering Technology. I'm trying to find the fundamental difference between the two, but the only thing I can find is that... |
H: Resistor placement in filter circuits
Why does the placement of the resistor in a filter circuit matter? I've heard if you switch an inductor and a resistor in a series circuit it could change the type of filter you get. Ex: From a low pass filter to a high pass filter.
AI: Some things in nature simply aren't commu... |
H: What type of battery does a small gray Mastercraft Pocket Digital Multimeter (model 52-0051-4) require?
Canadian Tire is a retail chain which operates only in Canada. They're probably one of the biggest retailers of hardware and tools in the country.
One of their store brands is Mastercraft. About ten years ago, t... |
H: When and why use triangle solder joints
I found these triangular solder joints in a 24v power supply. Why are they made as triangles? This is the first time I have seen it and I was unable to google anything about it.
AI: Please note a little notch (adjacent to "R7"), a narrow slot in the thick trace. These special... |
H: Extending signal cable
I have a signal cable (also transmits power) that is extremely short (see attached picture).
I would like to extend the cable with one meter (3ft), and I was thinking of cutting it in two (again see picture), and then attaching it to either a phone cable or a flat console (serial) cable, but ... |
H: Amp Draw On Battery Over Time & Battery Run Time
Can someone post a formula / help me figure out how to figure out the battery run time for the following scenario?
I have a single 12v led light bulb with a draw of 510mA @ 12v and 1400mA @ 8v. If I start with a AGM 12v 80Ah battery and let it run for say 10 hours ho... |
H: Does metal toggle switch in simple AC lamp circuit need to be grounded
I am getting into woodworking and would like to build a simple lamp like the one in this video on Youtube: https://youtu.be/BY5FzfxvZrg In the video, the lamp body/enclosure is built out of wood. The switch used to turn the lamp on and off is a... |
H: Trouble analyzing transistor's circuit
simulate this circuit – Schematic created using CircuitLab
\$V_{cc}=20V\\V_{BE1}=V_{BE2}=0.5V\\V_{BE3}=0.6V\\\beta_1=\beta_2=100\\\beta_3=50\$
I need to find V in this circuit. I tried to use the path for KVL with the least unknowns but a lot of times I end up with linear de... |
H: Is my schematics correct? (Atmega328p for solenoids control)
Finally I finished the second version of my circuit which should control different solenoids.
You can view the large version here.
In particular, this circuit should control 2 proportional solenoids and 7 ON/OFF solenoids.
The solenoids parameters are: ... |
H: What do these Battery Specifications mean?
I have a sealed lead acid battery with the spec as below:
6V 4.5Ah/20HR
Constant voltage charge
Cycle use : 7.25V-7.45V
Initial current : less than 1.8A
Standby use: 6.8V - 8.9V
What do these data mean?
Thanks for your help.
AI: "Standby use: 6.8V - 8.9V "
It means... |
H: Understanding and measuring voltage output of chime transformer
I am interested in replacing my doorbell chime with a new one. The existing button and transformer work, but I want to make sure that the chime I get is compatible with the output of the transformer. I'm not sure where the transformer is actually loc... |
H: What kind of LED do I need?
I want to learn about analogue circuit design and thought I'd start of reeeaaally simple, with a circuit where you connect the battery and the LED turns on. I've been looking on digikey.nz for the right components but they don't seem to offer the kind of LED I'm looking for.
I want a sma... |
H: How to simulate a d-flip flop counter/divider?
I would like to simulate a simple one-bit counter (or frequency divider) using the D-flip flop.
However, I don't want to use the abstracted D-flip flop above. Rather, I want to simulate this using primitive NOR/AND gates directly. I rigged up a D-flip flop based on ... |
H: Would this isolated boost topology work?
I've been trying to create an isolated DC/DC converter for cell balancing but I can't seem to get the topology quite right.
In the topology shown in the picture, the cell is on the left and the battery on the right.
The MOSFET with the tag "C1" shorts the inductor, increasi... |
H: Audio AMP Datasheet help
Disclaimer: I know you aren't supposed to ask about specific IC's as it is not helpful to the community in general, but I am at my wit's end here so I will try to make this as relevant as possible.
I would like to add audio to a good ol' Raspberry Pi Zero. Specifically I would like to take... |
H: Unable to enter in Programming mode (AT_Studio)
I've a board with the SAML21E17B uC, when I want to connect/ program it using JLink(edu) and Atmel Studio I get and error message, that the IDE is unable to enter the programming mode
any idea what's the problem and how may I solve it ?
UPDATE
after Wossname answer... |
H: Superconductivity and LR Time Constant
It takes a certain time for current to reach it's maximum value(i.e steady state at 99% or 100%), and that times is(to my knowledge) determined by the value of inductance(L) and resistance(R) of a conductor. If a superconductor is used instead of a normal conductor(like copper... |
H: Are these two circuit equivelent (the same)?
Question: Are these two circuit equivelent (the same)?
AI: Look good and you see that only C3 and L3 have changed position. Connecting wires do not change a circuit.
Now if you need to calculate voltages and currents in such a system then all loop currents are the same ... |
H: Why are car batteries still so heavy?
Back when I was a kid, car batteries used to be huge heavy lumps of plastic filled with lead and acid. They used to weigh almost as much as a mobile phone (slight exaggeration there, sorry).
45 years later, car batteries still look the same and weigh the same.
So, in this moder... |
H: Windings of BLDC motor
I learned an algorithm for winding a BLDC motor. This algoithm has the windings crossing several stator teeth similar to this image:
When I google BLDC stator, I see way more images like this :
In this image, the windings mostly go around a single tooth. They do not span multiple teeth aw... |
H: small audio amplifier (voltage converter) output DC bias problem
Update
The circuit I used was wrong as answered, the output cap needs to be polarized in reverse from the drawing. It otherwises causes the DC bias!
Except that the cirucit is working fine, I am using it to power a raspberry PI audio from 1Vpp to 3Vpp... |
H: Address decoding
I'm currently working on a task where I'm supposed to find the memory address of the following external bus interface of a microcontroller (logical 0, CS-signal)
However, I am uncertain of how to solve the issue. I managed to find the the memory address of ROM and RAM 2.
ROM (HEX): 0000 - 00FF (00... |
H: Which flux type to use for SMD hobbyist (home-made) PCB?
"Short" question
Which flux type to use for SMD hobbyist (home-made) PCB?
How to know if a specific flux (e.g. F-SW-33) is no-clean or require cleaning.
How to know if a specific flux conduct electricity?
What is the impact of Halides?
Longer question, incl... |
H: There are multiple things to be discussed regarding LEDs and KVL
simulate this circuit – Schematic created using CircuitLab
I have 3 Red LEDs and a 3 volt cr2032 coin cell. All the LEDs are in series with the cell. Obviously, none works as the combined forward voltage is more than supply voltage. But voltage acros... |
H: Floating USART line cause uC reset
I am working on a project using Atmel SAMD20 microcontroller (anyway, my question is in a general aspect, so I think this should not affect the answer)
I use an USART to connect my board to the serial port for debugging purposes, TX and RX lines are directly connect to CP2102 RX a... |
H: How to eliminate noise from switched power supply
I have an isolated switching power supply (120v in, 12v out) that gives an output shown in Figure 1 when referenced to the output ground (I'm not TOO worried about that noise). The bigger issue I have is the noise I have when referencing the output voltage to the in... |
H: Driving IRF540N with darlington
I'm trying to drive MOSFETs with 3.3V PWM signal. Here is a (probably bad) circuit:
I know that a darlington is not the best thing to drive a mosfet with. But actually I need to drive many of them and the ULN2003A is very comfortable: 7 darlingtons in a single package, and it is che... |
H: Goral Oscillators
I am studying Colpitts oscillators with one single JFET. These circuits are well known. However, I experienced that I sometimes have start-up problems. I know this is related to the loop gain being too low. I the book 'Practical Oscillator Handbook' by Gottlieb I found the Goral oscillator. I modi... |
H: Is it possible that I fried an MCU pin by performing a continuity test
I have a microcontroller (dsPIC33EP64GS506, 64-pin, TQFP, link to its datasheet), which doesn't seem to work on 2 GPIO pins (pins 4:RC0 and 11:RC11), whereas all other pins are functional. The problem with these two pins is that they are directl... |
H: Relation between Resonant frequency and Resistance in series RLC circuit
simulate this circuit – Schematic created using CircuitLab
I have a series RLC circuit and I calculated the resonance frequency. Say its w (omega).
Now in second experiment, i use the resistor of half the value used in above ciruit. What effe... |
H: What's the purpose of the components shown in this circuits?
I have a question when studying a power switch circuits.
As shown in the picture below.
It's an switch to enable 12V and 5V to the system by EN signal.
My questions are:
What's the purpose of C2, C4, C5?
What's the purpose of D1, D2, R3, R4?
Thanks a l... |
H: Micro controller power up reset
I came across this circuit in pioneer brand vsx522 model amplifier circuit diagram. This supposed to initialize the microcontroller during AC power up.
But it looks like wrongly drawn. The resistor on the left is directly connected to the 3.3V linear regulator which is powered by a ... |
H: Weird Temperature Reading Fluctuations, LabVIEW
Click the "edit" link below the image in the preview instead. -->
simulate this circuit – Schematic created using CircuitLab
First I apologize for the crappy drawing, but I wanted to give a basic overview of what it looks like. It doesn't show my breadboard tho... |
H: Is there a pin header with 3mm pitch similar to the 0.1" pitch headers?
Is there a standard pin header with a 3mm pitch that is similar to the common 0.1" pitch pin headers (shown in photo below)? I'm not even sure what the correct name for these are. What is the best way to search for a part like this on Mouser or... |
H: Red wire 12V or 5V... How to tell?
This is my first post on Electrical engineering, so bear with me.
I'm making a project for school that is supposed to mimic a wind turbine. So, it will use a case fan for a computer as the "turbine". When looking at diagrams on Google, I see that there are usually only 4 wires:
... |
H: Phase shifting DC+AC audio signal without affecting its DC content
I have a strongly and asymmetrically clipped audio signal (green signal on attached picture), with DC bias content (blue signal).
In order to obtain the exact DC bias level of this composite signal later, first I would like to phase shift the signa... |
H: Reading from ROM and Generate a VGA Signal in FPGA
I have generated a VGA signal, and succeeded to draw a rectangle. I have also code for ROM designed using VHDL, and initialized with a file that has patterns. I'm beginner in VHDL and FPGA. I would like to read the contents of the ROM and use the VGA generator to d... |
H: How to choose electric motor for a linear actuator?
First of all, I'm an undergrad student of Mechanical Engineering, and I'm working on a project where the main component is a type of linear actuator which I'm going to design. I will use a roller screw mechanism for the actuator, and it's main job will be to compr... |
H: What am I misunderstanding in electrical circuits regarding voltage/current/resistance
I thought I understand electricity but some thing don't add up so I'm hoping someone can tell me what I am doing wrong. So, to me, voltage represents a potential ability/energy of a charge to do some work/to transfer energy. Resi... |
H: Difference between positive and negative LCD drive
I have a positive type custom ordered LCD with 60 segments.
Display type: Reflective
Duty: 1/4
Bias: 1/3
Now, i want to replace the positive LCD with negative type.
The LCD is presently driven directly by the micro controller. (MCU has dedicated LCD driver, SEG... |
H: Difference between select lines and control lines in Digital circuits?
I want to know about the conceptual difference, not a specific case.
AI: A select line selects something, like a specific chip. A control line is a line that controls something. A select line is a form of control line, along with such things as ... |
H: Refreshing flash memories. Does it work?
We all know that the flash memories have data retention time of around 10..20 years.
But what if we need to design a device that has to work for 1000 years?
The obvious solution is to make a flash reprogramming once every 5..10 years, refreshing the charges in the memory c... |
H: Picking correct level of resistance for a voltage divider
I want to measure my DC voltage source (aka batteries), vs my known Dc voltage from my DC-DC regulator. To do this I'll need a voltage divider. I can calculate the resistances I need - but what I'm not sure about is the over all level of resistance I shoul... |
H: Are AVR multi-cycle instructions pipelined?
Since AVR is a RISC architecture, most instructions only take a single cycle to execute. Still some need two or more cycles, e.g. adiw, which performs 16-bit addition, or ld to load data from SRAM.
Do these execution times denote only the latency of these instructions, or... |
H: How to verify the contents of ROM in FPGA
I'm new to FPGA and VHDL. I'm using Xilinx Spartan 3A.
I have wrote a custom ROM with initalization file .hex. I would like to verify that the rom is initalized with the values in the .hex value. Is there a method to verify the contants that is loaded from the file.
here ... |
H: How to calculate output resistance impadence with using small signal analyse?
Hello I am trying to understand calculating impadence of a transistor using small signal analysis. In the book I came across with following exmaple.
It tries to calculate Rout.
So I didn't understand how circuit at the left side have equi... |
H: Draw power from a portable mobile charger to power circuits
I usually power my beginner prototype circuits using mb102 power supply board, but it needs an external elimeter to draw power and then regulate it.
I was looking for a portable solution for my 5 volt and 3.3 volt circuit needs and came up with using a por... |
H: High efficiency mosfet driver
This is a follow up from Driving IRF540N with darlington
I came up with a different circuit that uses jfet op amps and smaller fets instead of gate pull up resistor:
The basic idea is that the opamps create a normal and an inverted 12V pwm signal. They open and close the 2N7000 fets.... |
H: When eqvivalent transfer function of two systems in series is a product of two transfer functions that describe these systems?
In control systems theory when two systems with transfer functions \$ H_1(s)\$ and \$H_2(s)\$ are in series, equivalent transfer function is given as \$H(s)=H_1(s)H_2(s)\$. However if we ha... |
H: What are the low level programming waveforms for the Atmel ATF16V8B?
I want to program some ATF16V8B chips for a project. Naturally I don't have a programmer. No problem, I'll homebrew it with a Raspberry Pi. It will be fun.
I only need one thing - I need the programming waveforms. Specific sequence enter program... |
H: what does reactive power mean here?
simulate this circuit – Schematic created using CircuitLab
assuming this circuit is run for 5 seconds period, the switch is closed for 1 second starting at t=3s
we can calculate average power as average = 1.8 W
but apparent power S = Vrms * Irms = 4.023 VA
and the difference wi... |
H: Stopping DC motor when motion being blocked without a limiting switch
Is there a way to stop a DC motor when its motion be blocked ? For example if it rotates in a free motion raising a load and the load reached a blocking part making the shaft not rotating while the current is on, ( without using a micro limiting ... |
H: AC measurement in a circuit
I used the spice language to build an integrator op-amp, and one of the questions I had to address is to run an AC analysis on it.
long story short- by looking at the transfer function of an integrator, I imagined I would get a negative voltage, but I got a positive one. Someone explaine... |
H: Arduino - Calculating Resistor's Power and Resistance
My Question
I know, for example, that using a LED in Arduino without a resistor would cause damages to the Arduino's I/O (damages the LED too?), right? Resistors as far as I know have the two main properties resistance and power, so if I needed to calculate the ... |
H: how to identify no of states?
If a sequential circuit will produce output as high if both present and previous inputs represent even number with present input being LSB. How many states are required to analyze this? how to identify and choose a parameter as state?
AI: If you are using a a mealy maching, you need tw... |
H: What could this signal be?
I'm attempting to use an oscilloscope to measure the power draw of a Raspberry Pi 2. I've got a circuit set up that looks something like this:
simulate this circuit – Schematic created using CircuitLab
I'm measuring on either side of R (I know that to determine the actual power consumpti... |
H: Question about the 3-transistor current mirror
This is a basic 3-transistor current mirror:
I see some circuits add an extra resistor from emitter of Q3 to \$V^{-}\$. Just like this:
What's the purpose of this resistor?
AI: I'll draw up the schematic you are talking about:
simulate this circuit – Schematic creat... |
H: How to model devices external to FPGA in a testbench?
FPGA could connect to lot of devices like memory devices (SRAM, SDRAM, DDR RAMs), data converters and various other complex ICs. Is it a normal practice to model them in a testbench to make verification "complete"? I assume that doing so will atleast require a c... |
H: Current in Transformer Primary (Forward Converter)
I currently read an application note from ON Semiconductor concerning forward converters. Latter explains why one needs core reset in case of the "single-switch" forward converter.
Consider the following slide, especially the graph of the current in the primary sid... |
H: Why is DC component ignored and AC analysis is used when obtaining input output impedance of a BJT transistor amplifier?
What I understand is: in discrete amplifier circuits, the aim of the DC analysis is to find the DC operating point. (I get this part)
And the texts I read so far mentions that AC analysis is done... |
H: How to prototype 9-VFQFN?
I am working on a project that will boost my Lipo voltage to 5V. I am looking at trying to use a boost converter like the TPS61235P from TI. Is there a good way to prototype this IC package (9-VFQFN) without having to create a custom breakout board just for this IC?
AI: TI is usually goo... |
H: Confusion in the difference between DC current gain and AC current gain in common emitter amplifier
Here is a definition:
It is easy to understand what DC current gain means here. The base current is constant, the collector current is also constant. An their ratio βdc = Ic/Ib. This is the DC current gain.
But I do... |
H: 2x10 amp = 20 amp?
I have a pretty simple setup, but i have a problem, that i what to solve the simple way.
I have buy a led bar supposed to be for truck but i will get it inside to light up a big wall here is the bar with the specs : Simplive® 42 inch 240w Led Work Light Bar Flood Spot Combo Beam Driving Lights Fo... |
H: What is this jelly like substance on electromagnetic shield of a LTE Modem?
I took apart a Huawei E3372 LTE Modem, and this is what I saw. A jelly like substance on the electromagnetic shield.
It is very soft and a bit sticky. I guess it is there to dissipate the heat from the modem, since it couple well to the ba... |
H: required wattage of chip resistors in audio opamp circuit?
I have the following DAC output stage in a design I'm working on, which takes the differential outputs of a DAC to create an unbalanced audio signal, 5.7Vpp.
For the R and C I would like to use 0402 chip capacitors and resistors. How do I figure out the re... |
H: Circuit analysis of graphic equalizer
I am having difficulty analyzing the following circuit:
Schematic from: eleccircuit.com - 5 Channels 2 Octave Graphic Equaliser by 4558 (copy from Wayback Machine)
I can see what the circuit does after running an AC sweep simulation. However, I would like to work out how the c... |
H: Pin functionality multiplexing in NXP p1010 processor
I am trying to make a small design using P1010 processor.
During power-up sequence processor fetches configuration through specific pins.
All of them are also used for other functionality.
The processor guide told us we have two options here.
First - use a PLD... |
H: Which Machine out of Induction machine, separately excited DC machine and permanent magnet DC machine will have the highest Torque to weight ratio?
Which factors affect this ratio. I am aware of the general statement that Induction machines are bulky and have seen DC machines that appear to be compact and light wei... |
H: Why Op-Amp Saturation voltage drop with increasing frequency?
i was Implementation of square and triangular wave generator using op-amps LF353.
I observed that when I choose different values of Resistor and Capacitor for different frequencies, with increasing frequency the amplitude of Square wave decreases and amp... |
H: lithium ion battery queries
I am currently looking at this battery: http://www.ebay.com/itm/DC-12V-1800mAh-Super-Rechargeable-Pack-Protable-Li-ion-Battery-EU-Plug-For-CCTV-/400940782911?hash=item5d59eed53f:g:mxwAAOSw5dNWj4Bn
I am going to use it for a slightly large robotics project where 12v is required for severa... |
H: What is the formula for charging a capacitor with constant current?
I read that the formula for calculating the time for a capacitor to charge with constant voltage is 5·τ = 5·(R·C) which is derived from the natural logarithm.
In another book I read that if you charged a capacitor with a constant current, the volta... |
H: PID Control Lithium-Ion Batteries
Please help in finding good literature/articles about PID Control for Li-Ion Batteries. I searched the internet but I heardly find anything. There are a lot of articles regarding motor control design, however no battery chargers.
The literature especially should handle control desi... |
H: Need help understanding IC Behavior
I built a circuit based on this IC.
Link: http://www.mouser.com/ds/2/256/MAX756-MAX757-92691.pdf
It says if you put the 2nd pin to Low, then it switches to 5 v out. That seems to be untrue. I found that if you float the pins and then touch a finger to the 1st pin, then it switch... |
H: Does the temperature of a processor influence its energy consumption?
I don't have a very strong background in physics and electrical engineering but just from knowing that the major or basically all energy consumption of a processor comes from switching its transistors and from the the electrical resistance, which... |
H: When you are designing a device with a CPU that only supports ddr3, is it possible to use ddr2 in that design instead?
Sitara™ AM57x Processors
I want to make a system and have access to ddr2 ram slot design files only. How can I re-route the controller to use ddr2 sodimm memory with a ddr3 interface. I am designin... |
H: Are diodes backwards?
So I've been learning about diodes (since I don't have an electrical background).
Technically, current flows from the negative side to the positive side (electron current flow).
However, a diode allows a flow from the + to the - side (forward bias) and disallows a flow from the - side to the +... |
H: What are the disadvantages of using a laptop power supply (into an LM317) as a bench power supply?
I have a Dell laptop charger, which claims to output 19V, 1.58A .
Is there any value in re-purposing this for hobby electronics?
I'm tempted to do something quite crude, such as feed an LM317 from it, and use that as ... |
H: VQFN Footprint for PCB Design?
I am currently working with TI's TPS61235. I need to put this IC onto a custom PCB for a project, but I cannot find any libraries for PCB designing software for this VQFN-9 layout. Is there anywhere where I can find these weird layouts to design PCBs with?
AI: You do not know how to... |
H: How can I remove transformer windings from wooden template?
I usually wind my larger MOT transformers by using a 2x4 as a template, then I push the zip-tied winding off the 2x4 and into the E section of transformer. As I knew I would be fighting for the last turn on this specific winding, I REALLY wound it tight. I... |
H: Significance of Capacitor Attached to output
so I have a question about a circuit design for an earpiece.
It seems clear to me that the first op-amp functions as a high pass filter, and I think the second op-amp is a simple inverting loop, but I'm not sure what the function of C2 is. Basically I'm confused as to w... |
H: Is it safe to frequently restart an ATX power supply
I'm powering five Arduinos and four LED strips (600 LEDs total) from an ATX power supply (CoolerMaster B2 Series 700W). Four Arduinos drive the four LED strips, and the fifth Arduino periodically cycles the power supply to keep the LED strip animations in sync.
T... |
H: Is more fuel consumed immediately when spinning reserve is brought on-line?
Spinning reserve is additional capacity (reserve) that generators which are on-line (spinning) are able to apply to the grid quickly in response to a failure elsewhere on the grid, or a spike in demand.
It's my understanding that spinning r... |
H: No output from shift register
I'm trying to use a Teensy 3.2 to control a digital scoreboard display. I'm using 6 common anode 7-seg displays controlled by two 74HC595 shift registers daisy chained to control a transistor array. (Schematic attached).
I followed this tutorial to connect the shift registers to the bo... |
H: If I re-scale my input range for differential input to ADC, can I double resolution?
I'm just building my first separate ADC circuit, after deciding Arduino was limiting me too much / it is just time to start understanding how to do things properly.
I currently am using a LT1290 ADC with a LT1027 5V reference. I ha... |
H: MOSFET Safe Operating Area vs Maximum Ratings
I've been building a project using some Infineon IPA093N06N3 MOSFETs. I carefully picked the correct values for the MOSFET that I needed, and calculated an estimated Tj based on the thermal resistance of the package I was using.
I only just noticed today the Safe Operat... |
H: analog output from pic 18f4520
i am trying to generate analog signal using pic and dac circuit attached
when i simulate using Proteus the signal does not make a full cycle
i thought that pic make reset after 24ms so i make the timer0 interrupt 50u instead of 100u then the signal make like reset after 12us
can an... |
H: power and fusing for first mains-powered project (100x WS2811 (RGB LED))
I'm a software guy who's done simple Arduino projects powered by a computer but doing my first project which involves mains/"wall" power. Working backwards:
2x 50-LED chains of WS2811 addressable LED's will be controlled by a FadeCandy. (A t... |
H: Net names aren't shown in EAGLE PCB layout
I created a PCB in EAGLE Cadsoft but Net names are invisible in PCB layer though all layers are selected to be visible. Any suggestion?
(I need names to be shown like the "jp1" on top left corner of PCB layer as in below image)
AI: Net names on tracks is available on Eagl... |
H: Which OpAmp supports voltage supply greater than + - 36V
I'm looking OpAmp which could be powered from dual power supply greater than + - 36V.
Current transformer provides 36,9V. And LM358 on a single supply could work up to 36V. I'm looking something what could be work on dual supply up to 40V.
Any suggestions?
... |
H: How to add reset functionality to a master-slave D-type flip-flop?
I'm trying to implement a shift register and therefore need values to be stored on the downwards edge of the clock signal (otherwise the whole register just sets to the input), so I am using a master-slave D-type flip-flop to store each bit. The des... |
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