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H: Program FPGA without JTAG?
I write embedded software that runs on a single board computer running Linux and talking to FPGAs. I do not do FPGA design, so I'm at the edge of my knowledge with this question: how do I program an FPGA without JTAG?
Background
At my previous employer, we had what folks called "chain fla... |
H: Full-Bridge Mosfet Vds Waveform Problem
I'm trying to build a full-bridge dc-dc converter, PWM signals are ok but drain-source waveform has some problems. Here is drain-source waveform with a proper pwm signal on gate.
Then I decided to add a C snubber(100nF) across drain-source and waveform turned into this:
Is ... |
H: How to match two impedances which both have an imaginary component?
I am designing a matching network for an inverted F antenna, the source RF pin impedance is 30 Ω + j10 Ω (source IC is an ESP32-D0WDQ6, datasheet here, RF pin impedance in section 2.5 on page 7). I will be designing the antenna using the openEMS si... |
H: Phase shift in AC Circuit power calculation
I have the below question. I am not trying to ask the answer for the problem.
But my question is that, we can see that 60deg is the phase shift.
But both the voltage and current across the passive element is 60deg. With respect to what is the phase shift 60deg.
Is the ph... |
H: Calculate the finger position on a Capacitive touch slider
When building a Capacitive touch slider like the picture shows, I know when finger tip touches the metal slider it would create a apparent sensor capacitance is increased by the introduction of a parallel path
to earth through human body.
But how could the... |
H: Is my battery really fully charged? Should I use the "pulse repair" button of my charger?
I have a 12V lead-acid battery that is detected at 0.8V when I use a multimeter:
When I plug my charger it says "fully charged":
Should I use the "repair" button of my charger (I don't know what it does)?
Is my battery dea... |
H: +-33V Overvoltage and reverse polarity protection
I found on this forum a schematic (Zener + MOSFET overvoltage protection).
But It does not work and I can't figure out why. this is the schematic:
I want to protect the power supply of an opAmp form voltage above 33V (and symetric -33V). It's maximum votlage is +-4... |
H: Connecting analog GND and power GND
I need to connect a power ground and an analog ground. The power ground is a SMPS output. The analog side consists of 8 opamps and their resistors and capacitors.
What's the best way to connect these two ground? With some ferrite beads? Resistors? Or directly connect them withou... |
H: What is this electrical component on a Time Crisis II I/O PCB?
I have a Nanco Time Crisis II That has a bad I/O board. Power is getting to the board, but not making it to the chip on the board (activity LEDs not flashing). I’m trying to trace where there may be a problem but there are components on the board I don... |
H: Adding harmonics to the square wave means
I have generated two imperfect square waves by:
Adding fundamental frequency with 10 odd harmonics.
Adding fundamental with 20 odd harmonics.
What difference should I observe between two imperfect square waves by increasing the number of harmonics?
AI: A practical answer
... |
H: Help with LTSpice full-wave rectifier simulation
I'm fairly new to LTSpice and its function. Our professor asked us to construct this specific circuit (in the photo). I tried doing it on my own, but I am not that confident if my LTSpice circuit is the same as the one that is instructed.
Note: Our professor only tau... |
H: What have I done wrong in determining the transfer function for this RCL circuit
What have I done wrong in determining the transfer function for this RCL circuit?
(1) $$\dfrac{Eo(s)}{Ei(s)}=\dfrac{s^2R_2CL+sL}{s^2CL(R_1+R_2)+s(R_1R_2C+L)+R_1} $$
Regardless, of how many times that I try, I get the same result. Howe... |
H: Asynchronous FIFO design with PULSE synchronizer
I'm trying to understand various implementations of asynchronous FIFO from the following link
https://inst.eecs.berkeley.edu/~cs150/sp10/Collections/Discussion/Honors/Honors14_1PP.pdf
In the slide 7 there's a proposal where pulse synchronizers are used for read and w... |
H: Question about PID control loop timing
For my project I am creating a RISC processing architecture on an FPGA that can perform various basic instructions like adding, multiplying, subtracting, storing and fetching from memory etc. To prove my architecture I am using these instructions to control the speed of a moto... |
H: Why is the arrow on this MOS transistor IC common?
The schematic below is of a CD4007 MOS transistor chip.
From the schematic it can be seen that on either side, PMOS or NMOS, the arrows indicating what type of MOS transistor it is are all connected to a single pin - pin 7 for the NMOS side, and pin 14 on the PMOS ... |
H: How can a diode parallel to the source can't take the source value but take about 0.7V?
I was practicing diode circuits and this question stucked in my mind. When a diode connected parallel to a DC voltage source, doesn't it have to take the value of the source rather than 0.7V according to Kirchoff laws ? ( the di... |
H: Oscilloscope bandwidth and PWM pulse width
I've been working on a project which involves a PWM signal that operates at 30khz with a 10 bit resolution. I am generating the signal with a Teensy 4.0, which has a 600mhz processor, well above the ~31mhz required to generate the PWM frequency and resolution I need. I was... |
H: What kind of gps battery can I use for uBlox NEO-M8N GPS module?
What kind of gps battery can I use for uBlox NEO-M8N GPS module? Would you please recommend gps battery? and Which can I use 5.5mAh or 11mAh?For example;
MS621FE-FL11E - BATTERY LITTIUM 3V 5.5MAH (https://ozdisan.com/bataryalar/sarj-edilebilir-pille... |
H: Is this diagram wrong as the congruent circuit?
Given the below diagram.
The 2 identities are given.
$$
V_{1}=AV_{2}+BI_{2}
$$
$$
I_{1}=CV_{2}+DI_{2}
$$
$$
A,B,C,D~\text{are constant coefficients.}
$$
As \$V_{2}=0~\$
\$V_{1}=BI_{2}\$
\$I_{1}=DI_{2}\$
the above circuit is congruent with the below diagram.
Hence,
\... |
H: Decay Modes - Stepper Motor related Query
I'm trying to understand something fundamental about Decay Modes.It is widely accepted on the internet that a slow decay mode shorts the Back-EMF of the motor and in essence stops the motor instantaneously. Hence the torque generated is higher when slow decay mode is used i... |
H: Help in assessing the input mains circuit integrity
I've been working on designing a (220-380 VAC) 3/4 wire phase energy meter and in terms of metrology operation, things were working very well quite similar in terms of metrology if compared to a commercial unit. Now I'm no expert in mains power electronics circu... |
H: Components in the circuit based on admittance (in complex form)
My Question
I have an admittance in complex form for a circuit.
Is it possible to know what components are in the circuit based on the admittance?
How do I calculate it?
AI: Is it possible to know what components are in the circuit based on the
admitta... |
H: Can USB 3.0 tracks be closer together than 5W if they're quite short?
I am currently laying out a space constrained PCB which contains some USB 3.0 Superspeed differential pairs. These USB signals are confined to the PCB, going from a Cypress CX3 chip to a USB 3.0 Hub chip. They do not go to or come from a connecto... |
H: How do I know which is the correct AI to connect to a system's "Synch Out" pin?
I am trying to measure a square signal that I should be obtaining from the "Trigger In" (Trigger Input) and the "Ground" pins being connected to the oscilloscope.
The signal we ought to be getting is not the one shown, so I was advised... |
H: Is it possible to generate light with an antenna?
An antenna (e.g. a dipole) is able to radiate at a certain frequency thanks to the EM field generated by a current provided by a signal generator at such a frequency.
So, for instance:
Voltage source at frequency f (representing an amplifier) + Antenna made of condu... |
H: LED driver operation vs boost converter operation
I am having this A80604 - LED Driver IC for driving a string of 9 LEDs. Each LED has a forward voltage drop of 3.1V and a forward current of 300mA through each LED. So, I need to generate a maximum of 30V for this LED string with forward current of 300mA. My input v... |
H: Add downloaded components to existing library in Altium?
I have just started using Altium as a student after using Eagle for a lot of years.
I download part libraries from sites like Ultra Librarian and can use the supplied script to generate a library with symbol, footprint and 3D body, I can then compile so I can... |
H: Not visualizing signal in oscilloscope when a speaker is connected
Hope you can help me with this, because I really don't understand what is happening.
I have the following electronic circuit.
The Arduino is generating a tone and I am changing the volume with a digital potentiometer.
The problem I found is when I ... |
H: Why is this buffered rail splitter oscillating and how can I compensate it?
Inspired by the question Op amp Power supply splitter with totem pole I played with the buffered rail splitter in LTspice. I placed a current sink as load on the output to simulate the current sourcing and sinking of a connected amplifier w... |
H: Decoupling caps not near IC pins - global decoupling
It is common wisdom that decoupling caps should be near the IC drawing power, minimizing loop inductance.
For some time, I have seen that Todd Hubing advocates what he calls global decoupling in some of the youtube examples they have for LearnEMC, if the board ha... |
H: Why does the current enter the negative terminal of this element and it is still absorbing power?
Hi there, I am learning the kirchhoffs-laws, according to the passive sign convention if a positive current enter through the positive terminal of an element and exits out of its negative terminal, then the element is... |
H: Dithering Modulation Frequency and Dithering Rate
I have a question regarding dithering.
I was reading this Application note and under section 4.1 page 5,they have given below,
I understand that we perform dithering in the DC-DC Switching converters to reduce the emission magnitude at the switching frequency and s... |
H: Device RF input calibration setup
A device requires RF input calibration. The input signal specification is: CW, 60MHz, 0.0 dBm.
The user manual recommends setup 1 (fig below).
Provided that the Signal Generator is capable of outputting the specified signal, what would be the advantage of using setup 1 instead of 2... |
H: No response from 2 working spi devices when they are stacked
I have two identical SPI devices but each off them is on a separate board, they are connected via a header that allows the board to be "stacked" on top of the master controller. the signal will pass through two ICs before it reaches the slave device, a si... |
H: Optocoupler design - why does this circuit work?
I am busy with some calculations regarding the components around the optocoupler and I am now finding myself in a bit of a mental struggle. I have done quite a lot of reading (at least here, here, here, this Vishay guide, this Toshiba guide and this Avago guide to na... |
H: PNP and NPN H-Bridge - Drive PNP from opposite output
To drive the PNP transistors on an H-bridge circuit, the control voltage needs to be at least the input voltage, or a secondary stage is driving the high-side PNPs.
I have come across a circuit that uses the output of the opposite switch to drive the PNP transis... |
H: Dithering Circuit using an Op-amp
I am reading and trying to understand this Application note from TI on how the dithering circuit works.
I can deduce that the Op-amp acts as a schmitt trigger but there's no details on how the frequency change is effected. Can someone help me with the working of the circuit on how ... |
H: What is the difference between "Storage Temp", "Ambient Temp" and "Operating Temp" mean?
To my understanding, ambient temperature is the temperature of the surrounding area while the unit being worked on is powered. While operating temperature is the temperature of the unit itself under heat and power.
I have seen ... |
H: Connecting a single end stop to two circuits
I currently have a garage door opener that has its own controller. One of its inputs supports a mechanical end stop, so it can know when it's done opening.
I'm in the process of adding a very simple circuit (based on a Sonoff, en ESP8266) to be able to control the garage... |
H: Does different bulbs in one circuit lead to shorter lifespan?
I had a conversation with my family regarding lifespans of bulbs. They claimed that they had observed that when different wattage bulbs are plugged in the same hanging light, the bulbs would die sooner. Specifically, they noticed that in a 3-way arrangem... |
H: Are fluorescent tubes dangerous?
I'm disassembling a Sega GameGear.
The capacitors inside are all rated 50v or lower, so it shouldn't be hazardous in that regard (I will discharge them anyway just to be sure).
However, the metal plate that covers the fluorescent tube of the screen, has a big "CAUTION: HIGH VOLTAG... |
H: Problem or misunderstand of ADATE bit on ATTiny45
I have 2 buttons connected to pulled-down ADC input.
I want to trigger ISR(SIG_ADC) when ADC finishes conversion - this is working.
If I start ADC using ADCSRA |= _BV(ADSC), this works OK;
I want ADC to start conversion automatically when there is HIGH edge on PB3.
... |
H: Using VBUS instead of the USB port to power a MCU
I'm using an EK-TMC123GXL, for now powering it from the PC. I have found some problems with some pins (ADC, PWM) that doesn't arise if I power it up applying 3.3V to its VBUS pin instead of connecting it to my PC.
However, in its user manual (part 1.5) I have read t... |
H: Do pads 6,7,8 have to be connected with pad 12 in this layout?
In eagle there is a line that says these have to be connected but the data sheet doesn't mention it.
Here is the data sheet in case it helps https://www.mouser.com/datasheet/2/468/RPX_1_0-1903909.pdf
AI: 12 is electrically connected to 6 7 8 internall... |
H: Calculating BJT Base Resistor Value
The circuit below supplies 3.3V to an antenna (3.3VGreen), which then gives GNSS info to a control module (ANT_GNSS). The attached antenna is datasheet and only consumes about 10mA
I'd like to be able to switch the antenna on and off to preserve power, as this application uses a... |
H: Why have both a Schottky Diode and a MOSFET for reverse voltage protection?
I was looking at this open-source power supply circuit for an automotive CANBus device. I am wondering it would include both a Schottky Diode (D1) and a MOSFET (Q1) on the power supply line. My understanding is that both of these are to pro... |
H: Full bridge rectifier - in depth explanation
Most explanations of full wave bridge rectifiers start off with a diagram like the one below, and
then go on about what will happen on the positive and negative cycle of the AC input voltage. This is all fine and well, but I would like to understand what goes on at a dee... |
H: Why place a "Polygon Pour Cutout" area in PCB?
This is a front end circuit for capture signal. The signal's highest frenquency is 20 MHz.
Why place a "Polygon Pour Cutout" area in PCB?
AI: Less capacitance. A ground plane underneath traces adds capacitance to those traces. It can mess with sensitive circuits. Note... |
H: Why does two-BJT transistor-based capacitance multiplier show bad performance
I'm trying to understand why two-BJT transistor-based capacitance multiplier shows bad performance.
The circuit (note that capacitance multipliers are bi-polar):
Below are time output for usual RC circuit (in green), same RC parameters p... |
H: Help! Why don't my connections show up on my pcb gerber files? But they show up on the Eagle layout?
Below is a screenshot of my Eagle pcb layout. and below that is a screenshot of my gerber file extracted from pcbway.com
As you can see none of the connections show up but they do show up if I take off the red polyg... |
H: Is there a way to increase space between connections and ground planes in eagle?
The below picture is a screen shot from eagle. The red shade means gnd.
Is there a way to increase the space between where the connection goes and the red, gnd, plane?
I'm paranoid I'm going to solder over the small gaps shown and caus... |
H: Cleaning a PCB w/ w/ Isopropyl Alcohol - What Type of Deionized Water Should I Use?
I read a post on this sub-stack from seven years ago, which detailed exactly what I need to do. I will be soldering some components on a laptop PCB, and I'll be using rosin flux. Therefore, I'll be cleaning it w/ 99 percent isopro... |
H: How to control the output current in when using a transistor as a switch?
Assuming that I have the following circuit where I use a transistor as a switch:
When the transistor is not active Vout will be equal to the Vcc and the current will become very high right? So if I want to add a combinatorial circuit or any ... |
H: Boost converter inductor selection - inductor ripple current calculation based on input current or output current?
I've a question regarding the inductor selection in a boost converter.
In this TI App note under Inductor Selection on page 3, it is asking to assume the inductor ripple current as a percentage of OUTP... |
H: Constant Gain-Bandwidth product in amplifiers
Can somebody explain to me how the gain-bandwidth product is constant in an amplifier or op-amp? I want to know the mathematical expression behind it if possible.
As said here: https://en.wikipedia.org/wiki/Gain%E2%80%93bandwidth_product
AI: can somebody explain to me h... |
H: Voltage ramp with split power supply
I want to create an controllable output voltage from -2.5 to +2.5 on the R8 resistor.
My circuit is:
simulate this circuit – Schematic created using CircuitLab
So my microcontroller controls the DAC, which outputs from 5V to 0V. This output goes to Differential amplifier (AMP2)... |
H: What is the "collector light current" of a phototransistor and how does it relate to the collector current?
I found the "collector light current" term in this datasheet (Vishay TEFT4300) but I can't find a definition for it on the internet nor figure out how it relates to the collector current.
I am particularly in... |
H: CCM, DCM and BCM - Inductor
In a boost converter, what is the factor that determines whether the power supply (dc-dc converter) will be in the CCM, BCM or DCM mode?
Because, I have an LED Driver A80604. And I am trying to calculate the inductor value for it.
Input Voltage = 9.5V to 16V
LED string = 9 LEDs (each Vf ... |
H: EV controller output signals
I am designing an electric vehicle controller for a university project. The motor driver varies the speed according to an analog voltage (0V-12V).
My queston is, should I use a digital potentiometer followed by a buffer or a DAC to change the digital signal output from the microcontroll... |
H: Does a radio antenna need to form a closed loop to function?
In either a radio transmitter or antenna, is the antenna and open end or a closed loop?
In electrical theory it seems that no open loop could achieve anything. But in physics a piece of metal exposed to radio frequencies might be expected to vary in elect... |
H: Convert 15 minute kW readings to a monthly kWh total
I have metering data (kW) in 15 minute intervals that I am trying to get a monthly kWh total for...
I simply summed the entire kW range, then multiplied it by hours in the month 745 (total number of readings 2,981/4). This seemed too simple though and now I'm jus... |
H: Piezoelectricity question
If I have a piezoelectric crystal and apply pressure to it , it will be deformed and a voltage between its 2 ends will be generated.
Is the voltage generated due to its deformation or due to the pressure?
If I continue to apply the same pressure and it doesn't get anymore deformed will th... |
H: Vestax PMC-07 Mixer PSU
I'm trying to fix a Vestax PMC-07 Mixer and I'm puzzled by the schematics.
It is fed by a single +12V wall-wart switching adapter through a DC Jack.
Can this configuration really produce a negative 10V rail using this combination of a NJM-7910 for the negative and a NJM-7810 for the positive... |
H: Right way of wiring discrete LEDs to make a high power LED panel
I want to make an LED panel as shown below:
I need some help understanding the wiring of discrete LEDs. Typically discrete LEDs are rated for 185 mA at 2.7 V. Calculated wattage will be roughly 0.5 watts.
I want to make a 100 W panel which means 200 ... |
H: Bandwidth and frequency confusion
This picture is taken from this answer. As far as I know, the bandwidth is the range of frequencies at which the gain does not go below 70.7% of its maximum gain. As we can see the author said when gain is 100 the "bandwidth" is 10,000. How? the graph simply says at frequency 10,0... |
H: Controlling MG946R servo with 3.3v PWM signal
For a project we're building a robot arm, using three MG946R servos and one MG90S servo. Now I was wondering how to control those since I've been tasked with acquiring the hardware.
I think the MG90S takes a 3.3v PWM signal since I've worked with its 'brother', the SG90... |
H: DSLR Hotshoe wiring to Arduino revisited - I'm getting false triggering. How can I overcome that?
I read this post of 7 years ago:DLSR Hotshoe wiring to Arduino
I built the exact circuit described in the answer, shown below, to detect when my canon DLSR hotshoe would send a "trigger" order to the flash. This trigge... |
H: Switch negative pulse
The following image shows a switch that, when activated, feeds a load with -10 volts. I have a microcontroller and I need to switch this, what can I use instead of the key? Npn transistor already tried but I couldn't, how to do it?!
(https://i.stack.imgur.com/q3dTK.png)
AI: Based on very littl... |
H: Why is the voltage drop over my MOSFET so large?
I am trying to use an NCV8403B N-channel power MOSFET to control the power for my circuit.
The schematic itself is quite simple:
The MOSFET is controlled by an SPST switch. When in the ON position, Vds and Vgs will be between 7V and 8.4V, depending on how charged th... |
H: Why should BJTs be saturated in switching circuits?
Assume that I'm going to drive an LED with a bipolar transistor as a switch. According to books, when the LED is on, the transistor should be saturated, i.e. V_CE should be close to zero. But why do authors emphasize on saturation? I mean, in plots of collector cu... |
H: As a general rule, should input pins be protected with a series resistor?
I have read this article about why and how protect input pins. The article mentions the specific scenario of industrial electronics, with the input pin conneted to a long wire.
However, if the input pin is connected through a short wire to a ... |
H: What are the final steps to arrive at the transfer function for this RCL circuit?
What are the final steps to arrive at the transfer function for this RCL circuit?
I am attempting to arrive at this transfer function $$\dfrac{V_o(s)}{V_i(s)}=\dfrac{sL}{CL(R_1+R_2)s^2+(R_1R_2C+L)s+R_1}$$ for the following RCL circuit... |
H: Friendly target identification in radar
Crossposted from Signal Processing stack exchange,
How do radar systems identify friendly targets to avoid AA locks during combat scenarios?
Do friendly planes broadcast a known signal or is something else going on?
AI: They use IFF (Identification Friend or Foe) for the Rada... |
H: Will the Boolean equation change when we reduce the CMOS transistors in a static CMOS logic?
We are doing a project about a multiplier. Two of my teammates are assigned to make the transistor level designs of the adders, subtractors and few barrel shifters. My prof has told me to make a structural level Verilog mod... |
H: Help decode/identify/guess this blown ceramic capacitor?
My monitor's backlight died (can still see screen with torch).
Found a blown ceramic disc capacitor. The problem is it's partly exploded over the values. I'm hoping people here might have a better guess.
The monitor is the Philips BDM4065UC.
The capacitor is ... |
H: Offsetting Op-Amp output offset in combination with charge pump
I want to have a +-12.0V square wave output from an opamp fed from a 3.3 and 5V power supply. The signal is 2.5kHz with a low duty cycle of 3-10% generated by an MCU. Peak voltage at both ends need to be within 0.1V from +-12V. The load I am driving is... |
H: Choosing the right voltage regulation - 12/24V to 5V
for my projects I always come across the power part which kinda bugs me. Usually i just open the TI webbench, put my parameters into and take whatever he gives me. But is that the right/good way?
Why and where do I choose linear vs step regulation? low heat low n... |
H: How can I carry DC component to negative side?
I made a sine wave with stm32f407VG DAC periphal. But my sine wave has DC component 1.32V. I designed high pass filter but DC component was gone. But I don't want it to be gone. How can I carry it to negative side?
AI: How can I carry it to negative side?
Assuming tha... |
H: Dc to DC converter: "split" one power supply (24V, 5A) into four power sources 5V, max 3A
I have one DC input 24V, 5A.
I have designed a 4 channel led driver using the PAM2804 for Cree RGBW leds.
I am using 3 of them. So, 3 Rgbw leds, and 3 led drivers.
I need to be able to control individual r,g,b,w channels, and ... |
H: What is this yellow component in my Samsung mains charger and what is its purpose?
What is this yellow component in my Samsung mains charger? On the top is written "DT0506C" and on the side is written "ETAOU81EBE BE 1218".
Similar looking components I've found were transformers. In my opinion it is way too far away... |
H: BJT in saturation mode equations
Suppose we have this circuit:
simulate this circuit – Schematic created using CircuitLab
The BJT transistor is in saturation mode.Which are the equations which help us find the different currents(Emitter , Base and Collector current)?
I only know how to solve BJT transistors in for... |
H: Why does this transistor limit the current so much?
I have been trying to understand how a transistor works. I bought a simulator to be able to understand it better.
Below is a small circuit I designed. The load is a lamp. The characteristics of the lamp are 5 V, 50 W, so it should draw 10 A.
When I design the sche... |
H: Matched pair PNP usage
I am asking help to understand the circuit in the black rectangle below.
It’s using a matched pair of PNP, with common Base. I was thinking to a kind of current mirror, but R2 and R3 are different. I have looked in usage of matched pairs and I understand its main properties are equally matche... |
H: ESP32/ESP8266 external programmer two way design question
When I design a PCB that has a ESP32/ESP8266, I usually integrate a USB-UART bridge in the design as well. However, I am now working on a board that will likely have more than just a few copies.
The USB-UART bridge isn't necessary in this particular applicat... |
H: Expected behavior for damaged transistor
The generic question I have is what's the "expected" behavior for a damaged BJT. Let me add more color..
I was trying to fix my kid's toy where a motor would run even when it wasn't supposed to (no matter if the switch was on or off, it would always run). I tried to reverse-... |
H: ESP12F (ESP8266): every program runs okay but it's warm/hot
I have an ESP12F that I programmed with USB-TTL from the Arduino IDE.
The wire setup when a program is running:
USB->ESP12F
RX->TX
TX->RX
3V3->VCC
GND->GND
While on GPIOs of ESP12F:
RST->VCC
CH_PD->VCC
GPIO 0->VCC
GPIO 15->GND
When I touch the ESP12F, I fe... |
H: Why there was no power to an electric cloth dryer?
The other day I stumbled on something very puzzling to me.
I installed a 3 prong dryer cord on a previously working dryer and as I plugged it in the wall outlet the dryer would not turn on.
I was aware that the outlet was good. I unplugged the cord and checked it ... |
H: Resonance Frequency of system with two inductors
I am trying to derive a formula for the resonance frequency of the following circuit:
The piece that is giving me trouble are the two inductors, that (although I might be wrong) cannot be further simplified. Therefore, it is not possible to use the known/basic formu... |
H: Is this a Depletion MOSFET?
I am confused on whether this is a depletion or enchantment MOSFET and I am wondering if anyone could figure it out. I need a depletion MOSFET for my circuit and can't figure out if this MOSFET is one.
Here is the link to the MOSFET:
https://lcsc.com/product-detail/MOSFET_ROHM-Semicon-RT... |
H: Changing board shape in Altium: sliding the edge does not work
How can I slide this edge?
According to Altium documentation, I should:"Click anywhere along an edge, away from editing handles, and drag to slide that edge" but it does not work for me. What am I missing?
AI: To change board shape in Altium,
Go to y... |
H: Connect load cell to hx711
I have a 50 kg load cell and an HX711 sensor (as in the image below), my problem is that in all the tutorials I've seen people use load cells with 4 output wires or 2 cells with 3 output cables, I just need to connect only one, so I can weigh objects. I do not know if I really need 2 load... |
H: Increase number of practical microcontroller outputs (x when pin 1 is powered, y when pin 2 is powered, and z when both are)?
Is there any way to make a circuit that powers (only) x part of it when pin 1 is powered, (only) y part of it when pin 2 is powered, and only z part of it when both are?
I am new at electron... |
H: LED and the resistors
I am a beginner in Electronics. I would like to clarify if my understanding regarding LEDs is correct.
Suppose that we have an imaginary battery with no internal resistor that provides 2 volts. Assuming that we have a LED with forward voltage and current 2 volts and 10mA respectively. The ques... |
H: Is this negative regulator really meant to be an inverted positive regulator?
Project: make a power supply that can replace the 240V AC supply shown, so that I don't die when messing with the board that this connects to.
I'm only interested in the part inside the yellow box; the +40V output goes to the power amp se... |
H: No PSB pin on LCD?
I bought a Winstar 144x32 LCD (WG14432D) because it was cheap and it would be nice to do some experiments with it. The main problem with this LCD is that it has no (working) library for it.
I already searched the whole Internet with Google, but my results were unimpressive:
https://forum.crystalf... |
H: IR Barrier with a 555
I'm trying to build an IR Barrier with an 555, a sfh4547 and a tssp58038. Here are the datasheets:
http://www.ti.com/lit/ds/symlink/ne555.pdf
https://www.osram-os.com/Graphics/XPic0/00209793_0.pdf/SFH%204547.pdf
http://www.vishay.com/docs/82479/tssp58038.pdf
This is the schematic of the emitte... |
H: Can single-sideband (SSB) be used with PSK, QAM or APSK?
I got this question while considering the Nyquist no-ISI criterion, the consequence of which is that if we send one baseband symbol every T (time) then unless the bandwidth B of the channel is at least 1/2T it is inevitable that there will be inter-symbol int... |
H: Using triac as a tripping device
Can i use DC Voltage (5DCV or more?) to trip the Gate of a Triac BTA series Transistor to connect Terminal 1 and Terminal 2 completing the circuit?
AI: Yes, but you need a resistor in series with the gate to limit the current. Read the data sheet to find the gate voltage at the desi... |
H: Dual Feedback Transistor Biasing a Common Emitter Amplifier
I was reviewing/following a tutorial describing the pros/cons of various transistor base biasing configurations. Configuration #4 is shown above. Resistor Rb2 was added to what was previously Configuration #3. The circuit with the text is shown below (... |
H: Can a vacuum tube Triode increase the voltage in a circuit above the voltage rating of the batteries in the circuit?
I guess this will take a little explanation. I have not mastered the "sketching" used on this website yet. The triode in question has one plate circuit connected to a 90 volt battery and the filament... |
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