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H: Simple, efficient "breathing" LED circuit
I'm currently working on a small circuit, which I intend on running off a CR2032. The intent is to have the circuit last at least 2 weeks (the longer the better), pulsing a green LED every 3 seconds, with a DIP switch to toggle power. I'm planning to use a 555 timer with ... |
H: LED-lighting problem
I'm trying to explain some LED-lighting phenomena, that we (me and my family) have observed, while changing light bulbs into LEDs. I've had some courses in semiconductor physics, and I've had a basic course in electronics, but I still have some difficulties in explaining these phenomena.
In our... |
H: How is this simple counter implemented on an FPGA without a clock?
As part of an assignment, I must create these blocks that tie in to a larger top level module. (there are more blocks not pictured). I have everything working fine, except this UP/DOWN counter because I can't really work out how this can possibly... |
H: What's the best way to add USB support to a project
It just so happened that I need to add a usb communication for my next project that I am working on.What's the best/cheapest way to do this.
Should I be using a microcontroller with USB support like maybe the ATMEGA32U2 or use a ftdi chip,or maybe something else.
... |
H: real time online push button based counting system
I am doing this project:
I have 4 inputs. These are push buttons, connected to a microcontroller.
Each time a push button is pressed, say for example pushbutton_1 is pressed, the press of a switch button should be recognised as a HIGH.
In its normal unpressed state... |
H: User power supply current limit to avoid current limiting resistors for LED
everyone!
I would like to know if I can avoid to use current limiting resistors by pushing my power supply to its limits (it already sounds not like a good idea... btw...).
Say I have a 3.3V power supply with 200mA current limit.
Question ... |
H: Identifying the "Preset" Component in this 555 Monostable Timer PCB
I have a PCB for a 555 monostable timer circuit as shown below:
For the most part, the components are clearly labeled (I think the round circle with a + inside denotes a capacitor, but please correct me if I'm wrong). The only component I can't q... |
H: Lower Voltage With A Zener Diode
I am trying to lower the voltage from a 9V battery to 5V for use on an Arduino pin. I bought a 5.1V zener diode from RadioShack. Will this do what I want? Do I have to lower the amps as well? It looks like the battery delivers 9V and 1A. Should I first use a resistor to lower the am... |
H: 74HC595 Shift register - output pin polarity
Most shift register tutorials I've seen have the output pins connected to ground (for instance: http://www.arduino.cc/en/Tutorial/ShiftOut), however I've seen at least one circuit that connects them to VCC instead (https://learn.adafruit.com/assets/7766).
These circuits ... |
H: Forces, on a wire in motion in a magnetic field?
When a wire is placed inside a magnetic field, and current starts to flow in that wire, and that wire experiences the Lorentz force = \$ I\ell\times B \$, and begins to move, aside from Induced motional-EMF = \$-vB\ell\$, isn't there another force of repulsion/attrac... |
H: How to apply temporary pins to PCB
I want to temporarily solder a pin on my pcb where I know for a fact that it's going to be moved soon. Is there a better way? Is there like a plastic piece I can attach to the other side of the exposed wire that will allow me to temporarily attach this wire there?
I realize that's... |
H: ATtiny85 to control a relay, which will turn on and off a motor
I am trying trying to control a 5V relay (SRD-05VDC-SL-C) with the ATtiny85. I have a simple sketch uploaded (Blink without Delay example):
const int ledPin = 0; // the number of the LED pin
int ledState = LOW; // ledState used to set... |
H: Determine best capacitor for inductive load
If I know the Watts, the Power factor, the VA, or anything the standard Kill-A-Watt meter can measure, how can I determine the best capacitor to use for a heavily inductive load?
I have some Microwave Oven transformers I am using and I am hoping to make the power factor b... |
H: Circuits problem
simulate this circuit – Schematic created using CircuitLab
My question is what's the voltage between C and D?
R7=1kΩ
Vc-Vd = (Vc-Vb)/1000 + (Vb-Va)/1000 + (Va-Vd)/1000 = ¿Vc-Vd/1000? I'm in a loop.
So Vba = Vb-Va/1000 because its a open circuit, is that right?
AI: The answer is 3001V.
Here is m... |
H: Matching an amplifier to speakers and subwoofer
I've got a couple of old Bose speakers and bass and I'm looking to wire them with an amplifier so I can use them with a computers sound card.
The speakers' manual can be found here.
For the speakers:
they are rated 4-8 ohms and 10-200 watts per channel. I was wonderin... |
H: Identify flash IC by ID
I read flash device ID as following:
Manufacturer: c8
Device: 4013
Is this enough information in order to uniquely identify the IC?
Is there some web repository where I can check which device I have in hand, based on that ID?
Update:
Thanks to @RespawnedFluff answer below I found out th... |
H: (Beginner) Type of (NPN?) transistor to use for RasPi
I'm new to EE. I burned out a Raspberry Pi by running an electric motor directly from its GPIO pins, and then I learned about transistors. I now have another RasPi, but I'm not sure what transistors to buy. I plan on using the RasPi's 3.3v GPIO pins for the base... |
H: Is it mandatory to use thermals in hand soldered PCBs?
I understand thermals are used to prevent tombstoning during oven soldering by allowing all pads to heat up more evenly, but are they necessary when the PCB is going to be soldered by hand?
Consider that I have experience soldering SMDs and that I have a good s... |
H: Leaving the heater of a vacuum tube on all the time vs cycling it
I want to build a tube amplifier that will be on for ~7 hours/day. I was wondering whether the life expectancy of the tube would be higher if I left the heater on all the time and just turned the plate supply on and off.
The tube will most likely be ... |
H: What's the difference between EMSE vs. IMSE when buying components? (Linear Technology parts?)
For example, see this page for buying a LTC3388 step-down regulator, and note the difference between the LTC3388EMSE-1#PBF and LTC3388IMSE-1#PBF.
What's the difference? Is this notation specific just to components from L... |
H: What does "+:" mean in Verilog?
When I was looking at someone's Verilog code, I found "+:" in Verilog.
It looks like an arithmetic function but I'm not sure. I never seen before. Does anyone know this usage?
Update:
csum= csum + one_cnt[i* ('DPC_shift +1) +: ('DPC_shift +1)];
I have a query, is this synthesiable?
... |
H: Using Arduino Mega With lots of strain gauges
I was looking for a strain gauge shield for an Arduino Mega. I found this link which I found really useful:
http://www.osengr.org/Projects/Load-Cell-Shield/Load-Cell-Shield.html
At the bottom of the web page linked above, the details regarding the circuitry have been ma... |
H: Using an External interrupt from any pin PIC16F873A
I'm trying to use an interrupt, which will occur on a rising edge of a signal coming from my LSM303DLHC accelerometer. The accelerometer has a Data Ready (DRDY) signal that fires every time new data is added to the registers I've read from and I want to use this s... |
H: LED Voltage Drop Confusion
Please take a moment to checkout the simple circuit below:
simulate this circuit – Schematic created using CircuitLab
As you can see, this is a simple circuit consisting of three LEDs in series driven by one 6 volt DC power supply. The LEDs are white LEDs with a forward voltage drop or a... |
H: Series vs parallel for microphones (electric guitars)
I want to create a passive "mixer", with which I can connect two of my guitars to one amplifier, so basically one with two 6,3" input jacks and one for output.
For passives without a transformer as far as I know I have two options:
Connecting them parallel or se... |
H: Why does a large filter capacitor draw large (peak) current?
In my book it says that in a diode rectifier the capacitor gets charged close to the peak of the ac voltage.
Is it true the larger the (filter) capacitor the larger the peak current drawn and if so why?
And why is it that when the capacitor gets charged... |
H: ATTINY85 measuring internal voltage
I'm using an ATTINY85 for a portable application that uses a Lithium-ion battery; therefor I need to monitor the battery voltage so I don't kill the battery. Is there a way to go about this without using another pin? or using the reset pin? **NOTE: assume that there will be no re... |
H: Calculating voltage in diode circiut
Could you explain to me why U_out is -4,4V and only 3rd diode is open in the following example? Given that R is 10kOhm.
My physics resistant brain tell me that voltage at each anode is is 10,15 and 20(I know it's now just teasing you) shouldn't all diodes be open if cut-in volt... |
H: Wifi Channel vs a Sub 1 GHz channel of same width
If the same channel-width is allocated for a WiFi channel and also for a Sub-1 GHz channel, would the maximum allowable speed be the same for both channels theoretically?
If they differ, what is the theory behind the same?
AI: If the channel width and SNR are the sa... |
H: Can i change 5 pins tact switch to 4 pins tact switch?
I have AOC brand monitor with a manuall buttons which operate the menu OSD.
I would like to change the original tact switches(there are 5 tact switches) buttons in the circuit board.The problem is that the tact switches have 5 pins while i have only the 4 pins ... |
H: install a dimmer to a non dimmable led strip
I have a led strip installed. the type is 5050 14.4 watts/meter. I do not know if it is dimmable or not. What happens if i install a dimmer to the strip and it is not dimmable?
AI: 5050 SMD leds, are plain RGB leds. In these strips you have, they just add some current l... |
H: pic16f877A timer not working
i wrote a code in mikroc for pic16f877A in which i have used a timer0 and timer1. i debug my code and found that timer0 is not working but i am not able to understand the reason behind it. I even checked datasheet for the OPTION_REG but couldn't figure out the problem plz help. i am new... |
H: connect series of batteries in parallel?
I have eight sealed lead–acid batteries connected to my photovoltaic array in the way you can see in the image below.
A friend told me, that it was a bad idea to put those light-green cables in the middle. I put those, because I thought that this would equalize voltages when... |
H: Lower Voltage Methods Other Than Voltage Dividing
I have recently learned that voltage can be lowered using resistors to divide the voltage. This seems simple and easy. Before this I thought I had to use a voltage regulator or a zener diode to lower voltage. Is there any reason not to just use resistors? What is th... |
H: Phototransistor resistor value help
I have a rowing machine that I'm trying to replace the computer on. It uses a phototransistor switch to detect flywheel rotation speed. The phototransistor is an Optek OPB365T55.
Here is the datasheet.
TT electronics provides an App Bulletin showing a sample circuit and formula... |
H: Powering 100W amplifier with 12V rails from ATX power supply
I've got some old speakers that I'm planning to power using this 2x50W amplifier(link)(I'm open to suggestions of a better quality to price amp). To power the amp I was thinking of using an old ATX 400W Power supply(link) and connecting the four 12V wires... |
H: Theory for 3-bit full adder and calculations with un-/signed integers
With the following scheme, I built myself a 3-bit full adder. What I'm wondering is, and I couldn't figure this out myself, does the adder calculate with signed or unsigned values?
Is the range for the 3-bit adder between (-4) and 3, or is it be... |
H: How does a bridge rectifier work exactly?
If this question was posted before, please let me know. I searched for "how does a bridge rectifier work" and did not find an answer.
The part that I especially find confusing is when I have the four diodes in such a way and how each reacts to the incoming AC.
AI: A simple... |
H: Non tinted text on pcb altium
I added a string in PCB Editor and it is on Top Layer, which is good. But when viewing in 3D, its tinted. Its behind the color layer and not appearing clearly as it should like pads(the carbon part).
I couldn't find any setting to remove its region from color layer. How can I make it a... |
H: Finding component values of bandpass filter with load?
I have to find the components of a bandpass filter given only the two corner frequencies. The only components are \$C_1\$ and \$R_1\$ for the high pass, and \$R_2\$, \$C_2\$, and Load resistance (\$5\$M\$\Omega\$) on the low pass.
I set \$R_1\$ to \$10\$k\$\Om... |
H: Implementing a boolean function using a decoder
I am taking a course in computer organization, and currently struggling with circuits. I was stumped by the question below.
I drew the K-map for the boolean function and managed to obtain a simplified SoP expression:
W'Y' + XY + WX' (here ' refers to the complement).... |
H: Charge controller same volts "input" as "output"
I have bought a Steca Solsum 10.10F and I am having some problems with it.
I would like to ask you guys and gals some advice to figure out if it's a problem from my side or if it a problem with the charger control.
I have 2x40Watts solar panels connected to the charg... |
H: Solenoid Valve - Transistor or Relay?
bit of an amateur looking for some advice. I looked at the other question concerning my problem but i didn't find what i was looking for.
I need to switch ON and OFF a solenoid valve using my RPI. I found quite a lot of design.
But i can't decide on using a transistor like this... |
H: GSM regulations for 850/900 MHz band and 1800/1900MHz
I understand that GSM regulations establish that transmissions power for two bands must be as follows,
-Class 4 (2 W @ 850/900 MHz)
-Class 1 (1 W @ 1800/1900MHz)
But I also know that lower the frequency higher the range for equal transmission power. In that cas... |
H: Unpowered MAX232 - input 'leaking' into Vcc
My PC is connected to a MAX232 through a USB-to-serial cable. When everything is powered, there are no issues. However, when I turn off the power, the MAX232's \$V_{cc}\$ has a voltage of -0.5 V (presumably from the -9V input). This scares me because I have several other ... |
H: Phase shift and its importance in audio amplifiers
I've just begun building a bass (20-200Hz) class D amplifier and already ran into some problems.
The audio source is a car radio with 1V p-p signal. I firstly feed that sigal through a band-pass filter with corner frequencies at about 20Hz and 200Hz. This is how i... |
H: Solar Charge Controller Function Details
I am planning to make this Solar Charge Controller:
I would like to understand the way the components work to switch from charging to dumping and vice versa at set points. Note that the 555 timer is not being used as a timer, but is being used for its internal components.
A... |
H: old ibm trackpoint pin scheme
I have a trackpoint from a thinkpad keyboard with a trackpoint mounting a PTPM754DR microcontroller, what I'm trying to do is to find the usage of various pin on the trackpoint board and connect them to a teensy 2.0 that already controls a keyboard (I'm using this firmware https://gith... |
H: Why do wifi channels overlap?
In the United States and Canada there are 11 channels available for use in the 802.11b 2.4GHz WiFi Frequency range defined by the IEEE.
But there are only 3 non-overlapping channels available in the 802.11b standard.These are Channels 1,6, and 11. Why is it that we couldn't define a l... |
H: CAN Bus - Is bit stuffing required at EOF and INT?
In a CAN Bus, to ensure enough transitions to maintain synchronization, bit stuffing is used after five consecutive bits of the same polarity.
But we see that the End of Frame EOF (7 consecutive high bits) and the Intermission Int (3 consecutive high bits) make a t... |
H: Question about Audio signal trace layout (TLV320AIC3204)
I am using the TLV320AIC3204 in an audio project. The part is a stereo audio codec from TI. I'm curious about how the traces are to be laid out.
With other chips such as the AD1939, you need to lay the ADC and DAC lines out as differential traces since the... |
H: Customizing Digital Thumbwheel Switches
Has anyone used a Thumbwheel Switch such as these: http://www.digikey.com/product-search/en?mpart=A7D-106-1&vendor=39
I am interested in changing the internal number strip. For examples I have only found Digit based switches from 0-9, I personally would like to put my own set... |
H: The path of least resistance
I always knew that current will take all paths, even the other posts on this site say so; but I was doing this RC circuit today where the resistor and the capacitor are wired in parallel, I was told that the capacitor charges quickly because the current "will the take the path of least ... |
H: BJT Switch with a Diode from Base to Emitter
In this circuit, the diode is supposed to force a higher input voltage to turn the LED on, however when I created it on a breadboard I measured about the same input voltage (without the diode) to turn the LED on. My lab assignment then provides the second circuit with th... |
H: Finding inverse of a signal using analog circuits
How do I use an op amp to find inverse of a voltage signal? In other words, my output signal has an amplitude inverse of amplitude of input signal.
My solution was to convert the signal to digital form, find inverse digitally and then convert back to analog form.
Is... |
H: Calculate op-amp output voltage
I am trying to calculate the output voltage of the circuit. I know that this is a voltage follower, but I am trying to understand how it works.
simulate this circuit – Schematic created using CircuitLab
The first "golden rule" implies that
$$
V_a = V_b = V_{in}
$$
Now, the opamp has... |
H: dual vs single rail speaker excrusion
Is there a difference in speaker total excrusion if i using single and dual? Like if single it's just excrused from 0mm to like says, 5mm. and if it was dual rail i'll go from -5mm to 5mm? If yes then the single rail is actually less useful somehow? (Because inability to reach... |
H: Op Amp Integrator not working with DC Source
I am creating an Op-Amp Integrator circuit in Multisim. It seems to work for sinusoidal voltage inputs, square wave inputs, etc but when I connect it to a DC source the output voltage (channel A in the diagram below) just immediately goes to -11V. Based on the integrator... |
H: How can I view, debug, or analyze data being input to my FPGA?
I'm working with a Xilinx Spartan6 on Digilent's Nexys3 board.
I've also purchased their PmodMIC so I can try to get some audio data onto my board to perform some signal processing.
The PmodMIC has a simple SPI connection, and is supposed to seriall... |
H: NMOS Channel Type
I've seen some conflicting information about the inversion channel for an NMOS device. Is NMOS n-channel or p-channel? And is the substrate n or p? I know PMOS is just the opposite for both and the channel is opposite the substrate.
AI: N-MOS transistor looks Like this.
They are often called N-Ch... |
H: volt management for a big circuits (mother board if you will)
I've to have a 2 Ardunio and 1 Netduino in a board, they are connected to +100 component. All I need is less than 5A so I bought a 12v 6A power supply and need to ask some questions so I avoid doing anything stupid.
Is it safe to take a 5V (after passin... |
H: NIMH Battery excedes charge limit when plugged into Tenergy Charger?
I recently purchased a NIMH Battery (5000MAH, 7.2V) and when I plugged it into my Tenergy Battery Charger I set the charge rate to 5amps. After watching it for several minutes the "voltage" jumped to around 8volts. Did I set it to the correct amps... |
H: How to prevent DC motor from dropping voltage of supply when switching on
I have a circuit which uses an ATtiny85 output to a transistor (S9013), which will trigger a relay that controls a motor.
The reason for the transistor to relay is because I do not have a transistor that can take the current of the motor, so ... |
H: CAN Bus Physical Layer Twisted pair or not
CAN bus is very common in automotive or vehicular applications. In our case, we are using aerial platforms with have CAN bus links between operator remote and ground control box.
As is very typical of such products, the cables carrying the CAN bus around are neither shield... |
H: home audio: How much current flows through my speaker amplifier's output?
In a recent project I used relays to electronically control a multi-room speaker selector. I wired these relays in parallel with the physical switches in the box.
When I was designing it, I wasn't sure how to analyze how much current could be... |
H: multiband antenna for RF
I'd like to make a small chip using either the Texas Instruments CC1101 or the Nordic nrf9e5 that provides a range of different frequencies. This is mostly meant to be a tool for playing around at my local hackspace and doesn't need to have perfect signal characteristics, just "good enough"... |
H: Finding the voltage of a capacitor
I was given this problem by my prof and his answer is simply that it is a parallel RLC circuit and he uses $$s^2 +\frac{1}{RC}s+\frac{1}{LC} = 0$$ for the characteristic equation. It seems to me that it is invalid and when I try to find the solution using differential equations a... |
H: Is cyanoacrylate conductive?
Is cyanoacrylate adhesive ("superglue") conductive?
I need to repair some USB housings and I want to be sure any "overdrip" won't short the connection.
AI: No, CA glues are not conductive. They're really just a polymer just like any other plastic.
The bigger concern would be getting glu... |
H: Control Power Resistor with MOSFET
I am making a temperature control system using an Arduino. However, I have a problem with controlling a power resistor (which is used as a heater). I was suggested to use a MOSFET to control it. Unfortunately, my lack of knowledge about MOSFETs makes it difficult to do this.
As fa... |
H: bulbs in series with individual power
Three lamps (with individual power of 30W , 40W and 50W ) are connected in series to a source of 100V .
What is the voltage to the terminals of the 40W lamp ?
AI: Note: You may notice that I'm making a different assumption from some other answers, just because it leads to an an... |
H: How to read Slide Switch schematics?
I can't understand the schematics of the 20pin slide switch SS44D04.
The schematics are in this pdf: http://www.lightcountry.com/download/slide/Slide%20Switch%20SS%20Series-11.pdf
It is the first one in the pdf.
Can anyone help me?
AI: Those parts in the middle are rigid and are... |
H: 4 port 12 bit mux is consuming 48 macrocells!
I'm programming on the coolrunner II cpld. It is running out of resources so I decided to implement my own 4 port, 12 bit mux. After implementation I find that it's using over 40 macrocells. Any way to reduce this number? I've already tried using the optimization techni... |
H: Help with sensor output and data sheet
Here is all the circuitry I have.
I only found thisdata sheet which may be for this anemometer: http://www.synchrodan.hu/letoltes/kriwan/kulsoerzekelok/szel/N292_INT10K_69000248_e.pdf
What I don't get is is it pulse output or current output? There is current source sign and ... |
H: Use one or two transistors to switch an LED from PIC
I'm fairly new to electronics - I've had a reasonable amount of success with getting PCBs made using Eagle, but it was mostly wiring together breakouts and fairly simple stuff. I've spend the last two days learning about mosfets, resistors and transistors though,... |
H: Implementing Integer Division in hardware
I am trying to figure out how to create an efficient way to divide 5 bit numbers in hardware (using registers, Shift Registers, Comparators, Muxes, basic logic
gates, bit shifters, bit extenders, and Subtractors).
I know i can just iteratively subtract the divisor from the ... |
H: Puzzling behavior of op amp circuit
I'm trying to build a circuit that can amplify 5-20 mV DC voltage to around 3-5V. To achieve this, I'm using a standard non-inverting op-amp circuit, with gain
$$\frac{V_\text{out}}{V_\text{in}}=1+\frac{R_f}{R_g}$$
The problem is that the above formula is useless in predicting th... |
H: Using a 1.5V battery to increase the voltage from a headphone jack so it can switch a transistor at lower volumes
I recently built a circuit using a 2N3904 BJT transistor with the hopes that when connected to a headphone jack, it would light a LED whenever an audio signal was passed through. However, I found that ... |
H: Bypassing input capacitor with a microcontroller
I am designing an amplifier stage and I would like to be able to switch between AC or DC input coupling. How do I achieve this with a microcontroller?
I was thinking about using a relay, but it seems like an overkill for such an easy task.
AI: If you can solve this ... |
H: Connect ground of system A to 1v6 of system B?
I have an embedded system powered by a 3.7V LiPo battery that will be connected to an iPod's headphone out cable. The embedded system will perform some DSP on the iPod's audio out signal and use OpAmps to mix it with a second signal.
Through some of my own measurement... |
H: ATSAM functionality
I checked the datasheets and the overview pages on Atmel's site for these ARM cores, and I think they are amazing. Especially looking at the ATSAMA5D41, this would go well with a project I am working on. The only problem is, is I have no idea how the "pins" work. I cannot distinguish any individ... |
H: What is race condition in flip-flops?
I've gone through two of my text books and consulted my teacher but nothing seems to clarify my doubts.
The two versions of race which I've been taught are -
When the S and R inputs of an SR flipflop is at logical 1, then the output becomes unstable and it is known as race c... |
H: Altium Designer, change decimal separator
I'm wondering if it is possible to change the decimal separator in Altium Designer from a "." to a ","? I have looked for it and Googled it but I can't find anything.
AI: As far as I know it is not possible. But you can change the "comma" on your numeric keyboard to make a ... |
H: How do I specify 3 interrupt transfers per microframe in high-speed USB?
I am sending interrupt transfers over USB 2.0 and trying to get the maximum bandwidth possible. According to various documents, they indicate that "the endpoint descriptor may specify up to 3 interrupt transactions per microframe". I can't f... |
H: baudrate calculation from frame timings
I'm working to interface with an old serial protocol.
All I have actually is the frame format and various timings.
I need the baudrate to sync correctly and use the data properly.
My frame is 15 bits (one start, 12 data, one parity, one stop)
One bit is held for 10ms
One fra... |
H: How much shielding does an ungrounded metal box provide?
How much shielding does an ungrounded metal box provide? That is, a circuit is in a metal box but the box is not connected to either circuit ground nor externally earthed
AI: Shielding generally works like this:
If you apply an electric field from outside, el... |
H: Which is the "write enable" pin of flash memory in Stratix IV GX?
I am trying to use flash memory in Stratix IV GX fpga kit. For that I went through the pin details of the same. But the I was expecting "write enable" which will determine data is to be written to or read from the memory.
Is it the printing mistake ... |
H: Most energy efficient and very small volume way to produce motion
I'm looking to make motion (may be 100g) using very small, and very energy efficient component, and prefereably very cheap, i've found some nano servomotors which satisfy my criteria, but i wonder if there is any simple piece of hardware that acts li... |
H: Power Dissipation Issues
I built a circuit with a 5V power supply and a 300-ohm resistor. With a multimeter I did the measurements of resistance, voltage, and current across the resistor. The values were:
\$R = 298 \mathrm{\Omega} \$
\$E = 4.94 \mathrm{V}\$
\$I = 16 \mathrm{mA}\$
So I made the calcs to obtain the ... |
H: Design a full adder of two 1-bit numbers using multiplexers 4/1
How can i implement the full adder of two 1-bit numbers using only multiplexers 4/1? I created a truth table for a one-bit full adder, which looks like this:
A = first bit
B = second bit
Pu = bit from lower position (used to create an adder for mult... |
H: Reshaping the board in eagle
I want to change the shape of my board in eagle, e.g. I want to create a hexagon instead of the square. Unfortunately I only found the possibility to move the square-edges around and increasing or decreasing the size of the board, but I could not find a possibility to add or remove edge... |
H: Very long distance Ethernet connection for internet and other data (2000 feet)
I am building a house. It's located about 2000 feet away from the nearest internet cable. I had to run our electrical service underground the whole way, and have already installed a conduit for internet/phone cables from end to end with... |
H: How to maintain equal discharging on batteries
I am currently building a robot that has one 12V battery for each drive motor. The system was originally setup so that the two motor/motorcontroller/battery systems were completely separate. After testing, I discovered that one motor is used significantly more result... |
H: Understanding decoders and comparators
How can I implement the comparator of two 2-bit numbers using decoders DEC 2/4 and required logic gates? That comparator will be used to compare two 4-bit numbers. The comparator only has one output to show if the first number is bigger than the second. I created the truth tab... |
H: Why would any smartphone need an ambient light sensor if it already has a front-facing camera?
Why would any smartphone (e.g. the Samsung Galaxy S5) need an ambient light sensor if it already has a front-facing camera?
Surely it requires time and money for the engineers to design an ambient light sensors into a pho... |
H: Mesh current method question here?Is this correct?
We have the circuit in the figure.I have to find Vo in terms of Vi.
So I have the system of equations
{-Vi+ (1k+1k)I1- 1kI2-5=0
5+1k*I2+I2*1k-I1*1k=0
and Vo=1k*I2
We have 5-Vi=2kI1-I2 and 5=I1-2kI2 and Vo =1k*I2.I know that I should find I2 in terms of Vi from th... |
H: Why can't you divide a series + parallel circuit into branches to get total current?
Suppose we have a circuit like this where \$R_1 = R_2 = R_3 = 1\$
simulate this circuit – Schematic created using CircuitLab
Why can we not divide this into two branches, \$ B_1, B_2 \$ and then do the following to find total curr... |
H: Stepping-down DC voltage (at low current) in the presence of an audio circuit
I'm trying to add a bluetooth audio receiver to an old 12V battery-powered boombox. The receiver board takes 5V and shouldn't draw much current, but I'm trying to understand which type of DC-DC converter would introduce the least amount ... |
H: Are solder bridges on chips always bad?
I just bought my Arduino Ethernet shield – a knock-off one for $10 instead of $60. I connected it up, but it doesn’t work – LEDs light up but do not blink, and no ethernet link is established (ethernet switch doesn't light up, can’t ping, etc.). It’s as if the Arduino cannot ... |
H: Passive network with more than unity gain
Can a passive network have a transfer function of more than unity gain for some frequencies? Can you give an example?
AI: When you speak of "gain", you are usually referring to either voltage or current. It is not possible for a fully-passive circuit to have an over-unity ... |
H: Consume 12v to 5v converter
I am not a genius in eletronics but I know some information about converting 12v to 5v. There are different devices that can do these stuff like linear or switching converter, and I read that switching converter is the best one.
Now, my problem is to understand what is my relation betwee... |
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