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H: ADC Resolution vs ENOB
We know that ADC 1LSB=Vref/(2^N) where N is the resolution of the ADC.
We know that ADC Effective number of bits (ENOB) is always less than the resolution "N".
When calculating 1LSB do I need to take 1LSB = Vref/(2^ENOB) or I need to take 1LSB=Vref/(2^N)
AI: The LSB {not to be confused with... |
H: Why real part of load change as we look through transmission line?
As we move from an imaginary load towards generator through a transmission line, we can see that real and imaginary part of that impedance changes. In fact, an ideal transmission line is comprised of inductors and capacitors. It can alter only the i... |
H: Step Down Switching Regulator irregularity with ripple on output
Using the L5973D- I have followed the Schematic as the datasheet instructs, but I have tried two different inductors. I have found problems with other systems on the board with the one inductor (744 561 15), such as Microchip while running in debug mo... |
H: How can I use two TP4056 with four Li-ion batteries, but single load?
Need to connect and charge two Li-ion batteries in series.
I'm not sure if it is possible to connect and use two Li-ion batteries and TP4056 like this. Are they going to be balanced? Do they need to?
AI: Thus your problem now looks like this.
"N... |
H: Component searching
I'm not sure this is the right way to ask this, but I'm giving it a try anyways. I'm essentially looking for a component that using a clock signal can open and close 4 other channels.
Clock | 0 1 0 1 0 1 0 1
S0 | 0 1 0 0 0 0 0 0
S1 | 0 0 0 1 0 0 0 0
S2 | 0 0 0 0 0 1 0 0
S3 | 0 0 0 0 ... |
H: Current source with a grounded load and floating power supply
The following circuit represents a basic op-amp current source and can be found in the Art of Electronics 3rd edition on page 228.
Figure 4.10. Basic op-amp current source (floating load). in might come from a voltage divider, or it could be a signal ... |
H: How can I tell if a MOSFET is enhancement-mode or depletion-mode?
Today, from ignorance I have fallen head-first into the world of MOSFET transistors. In my scramble to find some information on the MOSFET I will be using as a switch (HEXFET actually), I learned that MOSFETs in general come in two modes, enhancement... |
H: Using Diodes instead of a Relay
While working on a switching setup for a automotive cooling fan, I came up with a question. Can diodes be used instead of a relay when dealing with two switching sources? The main source would be the cars accessory line that is on when the key is turned on. The other source is a dash... |
H: Having trouble with a frequency to voltage converter for universal frequency input
I'm having trouble with a frequency converter. The data sheet is given here.
I set the converter for universal frequency input and voltage output. These can be configured by DIP switches. The diagram from the data sheet is given as b... |
H: How can guitar pickups hot leads be wired in parallel without causing current problems?
I am looking up wiring diagrams for electric guitar pickups and noticing that the common method for combining two pickup signals is just to have a switch that can optionally have both the hot leads shorted together and routed to... |
H: Small signal equivalent circuit - MOSFET
Let's consider the following amplifier circuit:
Now, if we would analyze small signal operation, we could represent the circuit with small signal equivalent:
The part that bothers me is the PMOS representation in my workbook. Shouldn't the voltage controlled current source... |
H: Do resistors consume reactive power?
I encountered this problem in one of my books where the problem asked to find the power loss in the core of an induction motor. I worked through the problem and I found the current as in the picture, but it came to my notice that if I find the power across this load and then fi... |
H: Low-pass Filter with zero drift amplifier
Can an auto-zero or chopper amplifier be used in a low-pass filter to remove a high frequency carrier? I am trying to design an active low-pass filter with a 1kHz cutoff and very low DC drift, offset, 1/f noise. The noise needs to be less than 20μVrms in 1kHz BW and -80dB a... |
H: Is there any problems with driving a single 5mm LEDs off of a single or parallel 18650 batteries?
I want to drive one or two small (5 or 10 mm) white LEDs in parallel using one or multiple 18650 3.7vV Li-ion cells. The main reason I want to use the 18650's is, I already have them, they are rechargeable and have a p... |
H: how to adjust drain bias to keep power dissipation constant (HEMT)
I am reading a chapter in a thesis about using HEMT (high electron mobility transistor) as a cryogenic amplifier. The measurement scheme is to use the gate voltage fluctuation's influence on the drain source current.
In order to use a HEMT as an am... |
H: Battery saving self-poweroff circuit
I'm designing a battery powered device, which must be turned on by an external 3.3V impulse from a comparator output (TLV3201), and for the sake of power efficiency I want the MCU to power itself off when it has finished processing the event. For the self-poweroff circuit I've f... |
H: The best way to attach a heatsink to a SMD component?
There's a SoC I want to throw a heatsink on. What's the best way to do this for maximum heat transfer and longevity?
I know of thermal pads, thermal adhesive, and thermal paste -- but when it comes to the standard black plastic packages, I have no clue which of... |
H: GPIO state of MCU (AVR) with no supply voltage
In general:
what state do the GPIOs of a MCU (an AVR in my case) have when there is no supply voltage and the MCU is "off". Am I right that the pins are floating as there isn't any "reference" for the logic level at all.
In special:
I have a bilateral switch (BS) shift... |
H: How does an ATX power supply turn off?
It's well-known that for powering up a standard PC power supply, its PS_ON# line must be momentarily pulled low (i.e. connected to GND).
But how does the motherboard actually turn it off?
AI: The motherboard doesn't turn the power supply on and off. It controls it between a lo... |
H: common mode choke and derating vs current
I have a CMC that has is rated at about 1kR at 100Mhz at 3A
However my circuit uses only 1A. Do I need to derate my inductance since there is less current flowing through it ?
AI: If your common mode choke is passing a regular circuit current of 1 amp then that will be a di... |
H: What is the meaning of this line? "Memory-mapped, cached view of external QSPI flash. The cache is specified as 32 KB with 4-way associativity."
Memory-mapped, cached view of external QSPI flash. The cache is specified as 32 KB with
4-way associativity.
Does it mean that my external QSPI Flash is only 32Kb or i... |
H: Compare two numbers of four bits
I have two numbers both with four bits (a3 to a0 and b3 to b0 reading from left to right) and I would like to find out if a is bigger than b.
I have drawn a solution of mine and a short mathematical explanation of it, it would be amazing if somebody can tell me if this is correct.
S... |
H: Analysis of BJT transistor - is a linear analysis possible?
Since semiconductors aren't passive components, can I realistically derive analytic solutions for a circuit with BJTs? I know this may seem like a very naive question, but am I on the right track with this sort of analysis, or do I need more powerful numer... |
H: Pipelined vs Low Latency implementation of cube of a number in Verilog
I was studying about FPGA design and then came across this terms Throughput and Latency. So the author provided an example of a highly pipelined implementation of finding the cube root of a number:
which apparently has the following logic diagr... |
H: AVR bitwise operation: making a NOT with a microcontroller
I'm programming an ATtiny10, i have two spare pins, one of which is the external interrupt pin on PB2, and i want to write the inverse of that signal to PB1. I want to spare a component, since i have already the uC and some pins.
So far, the best option i c... |
H: Safety of Lipo batteries
I help organize a robotics competition in my home town. For the past 16 years, we provided each team with two 12v battery powered drill. They were cheap, easy to find and provided us with 4 batteries, two chargers and two motors. The battery chemistry was NiCd and provided us with two easy ... |
H: Why Flash memories have less P/E (Program / Erase) cycles (e.g. 100K) compared to EEPROM (e.g. 1000K)?
As per datasheet of EEPROM: CAT24C02 (On Semiconductors) - P/E Cycle count is > 1000k whereas as per datasheet of NAND Flash: MX30LF2G18AC-TI (MXIC) - P/E Cycle count is > 100k
I would like to know why there is su... |
H: Official GPS protocol documentation?
Searching for "GPS protocol" reveals many sources for processed GPS data, e.g. NMEA or binary outputs of GPS units.
Where is the official documentation for the GPS satellite - receiver protocol? Or any interesting supplemental material that might explain it?
Context: I'm especia... |
H: Is it appropriate to use a 300V RMS CAT I rated oscilloscope to measure 230V RMS of a power inverter?
Yesterday I decided to look at the waveform of my portable power inverter. The inverter specs are the following:
Input: 12 V DC
Output: 230 V RMS
Rated power: 300 W
I powered my inverter from a bench power supply... |
H: How to avoid this voltage when I turn on the circuit?
What I want to do is an Delay ON, but when I press the switch this voltage pass for a brief moment and turns the led on for a moment.
How can I avoid this?
Should I put the switch somewhere else?
If you can make another suggestion for a circuit I wold be happ... |
H: AD4610 - Is it possible to eleminate this single overshoot
I am trying to compensate input capacitance of the AD4610. It does not matter if it is actually over- or undershooting - there is always a spike:
I do not have this problem with the OPA4141 for example:
Is it possible to eliminate this single spike?
AI:... |
H: Why the earth attracts charge and where does the charge go when it goes into ground?
Self-explanatory question but to add what I know, by this I will also know if I am right or wrong.
I read somewhere that Earth is positively charged, but is not the state (whether positive/negative) of a body relative to the near b... |
H: How can I use a comparator in a circuit?
I am learning about how to use Operational Amplifiers as comparators. I understand that comparators are used to compare an input signal to a reference voltage. However, I am having a hard time visualizing this.
Say that I wanted a comparator with a reference voltage of 0 V ... |
H: Soldering 0.4mm pitch QFN 48 chip
I have this QFN 48 chip which has the following design :
As it can be observed, the pitch is 0.4mm. It seems like the conventional QFN adapters won't fit because the conventional ones has the pitch of 0.5mm.
I should have read thoroughly before buying it. Do you have any suggestio... |
H: 10 MHz reference distribution (daisy chaining vs. BNC tees vs something else)
10 MHz is the quasi-standard for reference clock in measurement equipment. Most boxes have "REF in" and "REF out" or "10 MHz in"/"10 MHz out".
In my case, I have a measurement setup consisting of an FSW, SMW200A and SMF100A (all top notch... |
H: Can a photodiode tolerate a reverse bias beyond its specification
While searching a literature related to my experiment I come across this paper https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4424026/pdf/PP_PP201500119.pdf . On the page 27 under the section SRS microscopy they have described the set up. The detector ... |
H: Finding Transformer Leakage Impedance from S/C, O/C and Winding resistance tests
I've recently done an experiment on a 415/100 V transformer. Performing the S/C test on the HV side and the Open Circuit test on the LV side and finding winding resistance from applied DC voltage and current.
Therefore I now have resul... |
H: How can a pringles can act as WiFi booster?
How does a wifi transciever placed inside a Pringles can act as a wifi signal booster. I saw this trick on Mr robot TV series.
Do WiFi routers emit less power than GSM or LTE. I know for :
GSM - 2W (33dbm)
LTE - 200mW (23dbm)
AI: As PlasmaHH says, it doesn't boost the tot... |
H: Heating a box (as a thermodynamics dummy)
I expect to build a dehydrator and am knowledgeable enough for most of it (fan, timer, power supply and so on), bar the most important part: the heating element.
If you're not familiar with electric dehydrators: you usually seek a 30-70°C (most of the time ~40°C) temperatur... |
H: LM2776 is it normal to have the oscillations in "bursts"
Is it normal LM2776 to oscillate in "bursts":
The frequency of the oscillation is OK, but they come in the 8 oscillation bursts every ~9us.
Is it normal? The board design and the schematic is exactly the same as in the DS.
The LM2776 is giving me the corre... |
H: Are these two ways of doing equivalent?
I have two signals sampled at, say, 256 Hz. I want to make the difference between these two signals and downsample them, say until 32 Hz.
Is it rigourously the same (in term of final result) to make first the difference between the two original signals and then downsample OR ... |
H: Stack overflow results
I have been forcing a problem regarding to corruption of the MCU flash memory content during software running. This corruption occurs randomly and I have got an idea whether the flash memory corruption could be result of stack overflow event. Is it ever possible? After all stack is in the RAM... |
H: In USB 2.0, what's the maximum delay between SETUP and DATA0 packets?
In the setup stage of a USB control transfer, the host sends both the SETUP and the DATA0 packets. Assuming that the device has received the SETUP packet, how long should it wait for the DATA0 packet? I wasn't successful at finding that informati... |
H: How to stack protoboards solidly?
I have an enclosure and want to add some protoboards inside it. I can place two next to each other, but since I'm a bit out of space I think it's best to stack 3 of them with PCB spacers.
However, I will have some (not many) connections from one board to another (and second to thir... |
H: Audio amplifier alignment procedure questions
I have a couple of questions related to the alignment procedure for the amplifier of Klipsch SW-12, a powered subwoofer.
Its service manual (link below) says the following:
(page 3)
COMPRESSION
The compression circuit consists of U5, U6, and Q28 and is adjusted via R30.... |
H: Inductive load shorts power supply
I had a hair-brained idea the other day and put together the attached circuit.
The problem: the instant I push the switch to place a voltage across the inductor, the power supply shuts down. Clearly this is some sort of emergency power-down because I can start it right back up, bu... |
H: Are civilian GPS signals cryptographically signed?
As far as I understand, receiving enough GPS signals at the same time enables to deduce the position and the time.
I guess it is possible to use an offline receiver as a very precise clock.
If so, is it possible to flood this offline receiver with fake signals to m... |
H: Input impedance of a one stage voltage amplifier?
This is not a school/university assignment; I'm a physicist trying to learn some electronics. I'd like to calculate the input impedance of the following circuit.
simulate this circuit – Schematic created using CircuitLab
We know that C1 has a reactance of \$X_{C1}=... |
H: is it true that whether a POS can read an NFC card, that POS is compatible with HCE?
I was wondering if the host card emulation would produce the same result as an physical contactless card is producing.
AI: That's the general idea. HCE requires being able to emulate the same radio and data standards that the card ... |
H: Do I need to consider RF power splitters for signal <1kHz?
I need to tap a signal on a BNC cord to record it with a Labjack ADC. The signal is very low frequency, as the FFT shows. I was planning on using an RF power splitter to add a line to the Labjack. Would an RF power splitter even be necessary for this app... |
H: An Audio Module heating up
I am using an Audio Module. The schematics of the module can be found below. The module uses a audio amplifier (TS4990IST) and STM32F0 MCU.
I found out when powering up the module, the module start heating up. In my module, capacitor C10 is not soldered. Can someone help me to rectify the... |
H: Legal to use non FCC-approved radio devices purchased locally?
Does anyone know if it's legal to use non FCC-approved radio devices which are purchased locally? For instance, if the device is purchased from a local eBay seller, is it still legal to use it in any setting (commercial or otherwise)? AFAIK it is the im... |
H: Is there such 555 timer circuit?
I was wondering if there is a simple 555 Timer circuit, or even simple transistors circuit, that has a HIGH output for 1sec, 2sec, or more seconds when I trigger the input switch and will remain HIGH till the specific time is done then it will go LOW. Knowing that when I trigger the... |
H: Selecting the equipment with the optimal 10 MHz reference
In a larger testbench I have 5 synchronized instruments (signal generators, ARBs, VSAs etc). I am trying to decide which instrument to take as "master". I rule out the older/cheaper parts (Tektronix AFG3253 and HP 8648C) and select between the following high... |
H: How i fix this PSPICE orCAD problem? - Model D1N747 used by D_D1 is undefined
From [PSPICE NETLIST] section of C:\SPB_DATA\cdssetup\OrCAD_PSpice\17.0.0\PSpice.ini file:
.lib "nomd.lib"
Analysis directives:
.TRAN 0 500ms 0
.OPTIONS ADVCONV
.PROBE64 V(alias()) I(alias()) W(alias()) D(alias()) NOISE(alias())
.I... |
H: LDO in split supply behaving incorrectly when power supply sequence is "wrong"
I'm powering an op-amp (OPA657) in transimpedance configuration. I externally supply ±15V, with LDOs to drop to ±5V; here I omit the feedback loop for simplicity:
When I turn on the negative rail (-15V) first, my positive-regulating LD... |
H: Can I connect DC12v on VAC output (2A 100-240V) relay?
Solid State Relay G3MB
This relay's output says "2 A at 100 to 240 VAC". If I wanted to connect something like DC12v 2A to this relay output,
It is not going work?
It might work, but it will damage the relay circuit?
I know this is a very stupid question, ... |
H: I need a potentiometer controlled by only a 0-10v signal
I have a PWM control box made for standard 4 pin PC type fans (12v). It has a potentiometer to control the fan speed via PWM. It is powered by its own 12v supply. I would like to exchange this manual potentiometer with one that is controlled by a 0-10V sig... |
H: Why does a classic envelope detector produce a negative voltage for some periods, when high frequencies are put in?
I'm playing around in ngspice & trying to understand envelope detectors for ham radio.
I'm pumping 150Mhz into the circuit described below - I'm expecting it to go positive in proportion to amplitude ... |
H: Icarus verilog syntax error in a generate block
In the top level of a module, I have the following block:
genvar i;
generate
for (i = 0; i < DEPTH; i++) begin
fifo_element #(WIDTH) element (.clk(clk),
.d_in(e_qd[i]),
.d_in_strobe(e_in_strobe[i]),
... |
H: Connecting Led in Series with Parallel Switches
I created a diagram for a circuit that i am trying to implement. I have attached my circuit diagram and have been trying to implement it but still have not got it to work. I've checked all the wiring and they are all connected correctly and I am getting a Voltage ... |
H: Safety design on mains detector
I've designed a simple mains detector which I have drawn below. The theory of operation is pretty simple. A capacitor is used to reduce the current so that my optocoupler can operate (represented by the LED below). With LTSpice, I get a nice sine wave @60Hz with ~3.5mA. I have omi... |
H: Correct wiring of a variable resistor
I built the following schematic and I made a mistake. I wired the 4.7M preset reversed.
This is the original schematic:
And this is the schematic that I drew in Kicad:
I already built the PCB but I am wondering what can happen if I wired the 4.7M multi turn preset reversed... |
H: How is the voltage regulator functioning in this vintage charging circuit?
Attached is a simplified diagram of my motorcycle's charging circuit. It has a standard 3-phase bridge rectifier circuit--simple enough.
I'm confused about two things:
How is the voltage regulator regulating the voltage here? Only one phase... |
H: Is "humming" normal in an AC relay?
I have a 240V relay that uses a 120VAC coil. When I switch power to the coil, the relay makes a faint humming sound. It isn't very loud, and sounds like a transformer almost. A normal speaking voice or small fan in the room is enough to drown it out, to give you an idea of the... |
H: STM32 Logic level high and low thresholds
I am scratching my head to find what are the minimum voltage for registering a low digital signal and maximum voltage for registering a high digital signal when I configure GPIO pins of STM32 (I am using STM32L476) as Input Capture mode (I want to measure some frequencies).... |
H: Practices for using a scope, scope probe and termination resistor for a proper measurement setup
In a setup, assuming a function generator has 50 Ohm output impedance and a coaxial cable has 50 Ohm characteristic impedance. Therefore to prevent reflection of a signal a 50 Ohm termination is used. But for many peopl... |
H: Proper convention for schematic component pin input/output arrows
In a schematic, if a designer chooses to use arrows on pins of a component, should they always point in the direction of current, or in the "perceived direction" of the signal? Or this a made-up designation with no real integrity?
I'm using Altium De... |
H: Airport radar is interfering with my circuitry
I am using an arduino, but this is not an arduino question. And unfortunately, I cannot share my schematic. I can tell you though that I have a stack of three arduino-sized boards which create two ground loops, each about the size of an arduino. I also have an RFID rea... |
H: How to calculate Junction to Ambient temperature of LED?
I'm trying to calculate the Junction to Ambient temperature for this Cree LED:
https://www.mouser.ca/datasheet/2/90/ds--XHP502-1093532.pdf
I know how to calculate this:
Junction Temp = Junction to case + Case to Heat Sink + Heat sink to Ambient + Ambient
Howe... |
H: Derive terminal voltages for a BJT
Question: A BJT for which \$BV_{CBO}\$ is 30 V is connected as shown in the figure below. What voltages would you measure on the collector, base and emitter?
simulate this circuit – Schematic created using CircuitLab
Answer: \$V_B = 13.3 V\$
\$V_C = 43.3 V\$
\$V_E = 12.6 V\$
I ha... |
H: SMDs on bottom side of board with THT components?
I'm designing a PCB for factory production and I'm not sure if placing SMD components on the bottom side of the board, which also contains THT components (pin headers and buttons, they're all on the top side though), will make the board manufacturable without a spec... |
H: Using LED display
This is my current circuit. It's a 2 person colour guessing game. The first person will choose the colour code the other player has to try and guess using the registers on the left and then set the colour code by transferring it to the registers on the right by clicking the set code button down th... |
H: installing a DIP package with broken legs
I'm attempting to modify my NES (Nintendo entertainment system) for RGB output. This involves removing the PPU from the board and soldering it onto a board supplied in the mod kit. This installation is rather notorious for giving people trouble. In particular, desoldering t... |
H: Working of a Doubly-Fed Induction generator (DFIG) in wind turbines
I am unable to understand how a Doubly-Fed Induction generator works (in Wind Energy conversion system)? I do not understand how the reactive power fed into the stator interacts with the rotor so as to produce active power in the stator. It would b... |
H: Is a 2 Ampere power supply dangerous?
I'm sorry if this question seems extremly dumb or/and pathetic. I'm quite new to electronics.
For one of my electronics projects, I want to buy a power supply like this one, but it says Output: 12V 2A and I know that 2 amps is dangerous for the human body.
So what does it mean?... |
H: Can you use a 3ph BLDC controller without a potentiometer?
I'm attempting to build a 12v fan and I'm looking at controllers to drive the 3 phases of the motor. It seems every ESC i find has a potentiometer included. I want my fan to always run at full speed and be turned on by a simple relay.
Can I just short the ... |
H: How does flyback converter with two MOSFETs work?
This is the schematic.
Both switches are in phase (On and Off at the same times).
When both SW are On, current flows through primary transformer coil, entering from the top side of it, and leaving through the dotted side, finally going to the ground through the l... |
H: Would a parallel EEPROM ever output a value that it does not contain?
I understand that when the address input to a parallel EEPROM changes from A to B, the output may show results that aren't the contents of either A or B, for a few nanoseconds.
Are these spurious outputs constrained to be values stored somewhere ... |
H: Calculating the transfer function of this op-amp circuit
The first op-amp is a differential, second one is a follower and third one is a second order low pass filter. I've been struggling with the low pass and the final output of the circuit and I am not sure whether my calculations are correct or not, they are st... |
H: Charging a device with higher amperage, can somebody please clear up the confusion and contradictory statements?
I have a PS Vita I wish to charge with my Samsung Galaxy charger, its output is 9.0V = 1.57A which is for fast charging (correct me if I'm wrong) and thus won't handshake with the Vita so won't supply th... |
H: How could using an ungrounded appliance with a grounded extension cord be a fire hazard?
I came across a tweet recently:
Don’t even THINK about using a 2-prong plug in a 3-hole slot! Use
only the required number of slots in an outlet or power strip.
Below was a picture of a burned-out grounded extension cord.
I'... |
H: By replacing capacitor values with different ones in a circuit, will the circuit still work?
I'm fairly new to electronics and following this schematic for a "Truth Meter", which detects sweat from your fingertips and a lights up an LED depending on the resistance of the skin, as one of my first projects. Anyway, ... |
H: Instantaneous vector sum of three phases 120 apart is not zero?
Vector sum of equal 3 phases 120 degree apart is zero and serves as a neutral. However, while drawing instantaneous vectors of the three phases, they summed up all together to give a vector. I have attached the animation which shows: "An ordinary three... |
H: Is it normal/common to use this way of connecting point to point wire?
I want to make a circuit and am uncertain if the following is feasible/common and if there are better solution.
From the pin headers (the light blue circles), e.g. GndIn (upper yellow circle), I want to use 24AWG stranded wire to three other pla... |
H: Calculate how much heat an IC produces
I'm building a device containing a large number of ICs. Now, I'm 99% certain heat won't be an issue. (Considering the volts and amps involved, I doubt you could accurately detect the amount of heat involved.) But, just for argument's sake, how would you go about calculating th... |
H: Protecting voltage sources against pushing or shorting into each other
I am designing a PCB where there is a load with peak power of 15 Watts to be powered from a user selectable voltage source.
There are a 35V and a 24V sources and it should be only one of the voltage sources to be active.
The user should be abl... |
H: Would a bridge rectifier allow to detect µs-scale pulses of either polarity
The incoming signal is ground-referenced and consists of short (a few µs each) pulses at >150V. The signal is at ground potential the rest of the time (the "duty cycle" is low), and is of low impedance (< 100 ohms).
To adapt this signal to ... |
H: Transmission Line Effects
My question has to do with the rule of thumb we generally use when dealing with transmission lines.
We say that if the length of the line is 10% or less of the wavelength, we could neglect the effects of the transmission lines—and that makes sense if we look at from the perspective of the ... |
H: How to charge a 48V battery (12V battery * 4 in series connection) with a 12V charger?
I found a question about charging the battery with a 12 volt charger. However I’m confused as to do this?
First method, unhooking and charging each battery individually?
But wouldn’t I be just shorting a battery out if I tried ... |
H: Can I sum up multiple, alternating series capacitors and resistors like this?
When the components are between each other, can I sum up multiple, alternating series capacitors and resistors like this? Thanks.
AI: Since they share the same current, the end-points cannot tell the difference in an equivalent circuit.
... |
H: Why we can't copy car remote patterns?
I have a set top box remote that I can use to control set top box as well as TV by using the set button on my stb remote.That remote can copy any remote IR pattern but when I tried it on a car remote it didn't worked.Do car remote uses different type of radiation?
AI: Do car r... |
H: What purpose is to place pins at bottom on STM32 discovery boards
What is purpose to have pins (pin header) on STM32 development board places at bottom? Arduino and similar have pins at top so you see the top of board and connect external peripherals by connectors that points up. But on the SMT32 Discovery (like ht... |
H: Electrical properties of a stack of strip board connected by through-hole pins/sockets
I'm aware that breadboards have a limit of 1-2MHz. I think this is because of capacitance.
Are there similar limits for a stack of stripboard connected by through-board sockets/pins? Would breaking all the tracks, to make them ... |
H: Line out cannot drive audio isolator
I have a cheap Bluetooth/FM radio module connected to a TDA7942. Unfortunately it passes all kinds of disturbances it picks up from the power supply to its line out.
I thought to connect an audio isolator to it, but it appears that the line out is not strong enough to drive thi... |
H: Confusion with understanding the fixed bias circuit
Below shows a bipolar transistor in fixed current bias configuration. A text says that this topology is independent of β:
What I understand is, since Vcc, Vbe and Rb is constant the base current becomes fixed as:
Ib = (Vcc-Vbe) / Rb
As we see in the above formula... |
H: THROUGH-HOLE PLATING problem
I'm making a stm32 board at home.
How can I plate through holes low cost at home?
Is there a low cost through hole plating kit?
AI: Olin Lathrop has mentioned the only likely solution. The pieces are essentially hollow copper rivets with very thin walls. The holes are drilled oversize,... |
H: How to make BJT/MOSFET work in RF?
I am trying to design an amplifier with a transistor model. I followed some basic tutorials online (http://microwave.eecs.utk.edu/ECE545_files/02_Lab_2.pdf) and designed a transistor model for BJT/MOSFET. I am stuck in making the amplifier work in RF frequencies. I guess either I ... |
H: Does the Si4731 / Si47xx provide the necessary info to fetch left/right demodulated audio levels?
I'm working on a project which uses an Si4731 broadcast radio receiver IC (Si47xx family) and which calls for left & right demodulated audio level meters based on a source FM broadcast signal. I expect this to be avai... |
H: Gate and routing delays as a function of voltage and temperature
As I understand from watching overclocking videos, the maximum operating frequency of a digital ASIC is a function of voltage and temperature. Specifically, it seems that the maximum operating frequency increases with higher voltages and lower tempera... |
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