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H: Adaptability of DALI Click Board for DALI Power Supply 18V DC, 250mA
I am developing a DALI Control Device using STM32 board. I have already programmed the board and got some basic results, now I want to test my device with industry standard DALI Control Gear. For that, I need to connect my board to DALI Bus Power ... |
H: BJT Voltage Divider Bias Circuit problem
Let's say we have the following circuit:
The known values are: \$\beta=100\$, \$Vcc=2.5V\$, \$V_A=\infty\$ (meaning the Early effect is not taken into account), \$V_{BE}=0.7V\$, \$I_S=8\cdot10^{-16}A\$ (which is the reverse saturation current of the base–emitter junction), ... |
H: Can I use a threaded rod on a wimshurst machine
On my Wimshurst machine which is built similar but not the same as http://steampunkworkshop.com/how-build-wimshurst-influence-machine-part-1, I'm using a threaded rod that comes out of the Leyden jar where my collecting comb and spark gap rod connects to.
I'm worrie... |
H: How arrays work in assembly language
I am not able to understand how arrays work in assembly language. In Irvine's book on Assembly Language it's written:
*** A string can be divided between multiple lines without
having to supply a label for each line:
greeting1 BYTE "Welcome to the Encryption Demo program "
BYTE ... |
H: Qustion about subthreshold voltage and driving capability
Recently,i read some paper,and some of paper said :
To reduce the power consumption of VLSI,Supply voltage has decreased to the subthreshold voltage,and the subthreshold circuits consume a very low power,but suffer from the speed degradation due to the low c... |
H: Pump Automatic Pressure Control Electronic Switch
What is the name of this small part?
AI: It looks like a Reed Switch - a pair of contacts that open or close in the presence of a magnetic field.
You'll need to select one that is capable of handling the current requirements for your circuit, which is impossible to ... |
H: Why am I getting my result as a string of Zs in Quartus?
I am new to Quartus, and have been trying to test out my 32-bit ALU on Quartus 13.1. When I try the functional simulation, I get a string of Zs. The results for the individual components, like the fullAdder, display the results fine. What can I do to view th... |
H: Calculate transfer function H(w) of Schmitt trigger with RC at inverting input
I have got the following Schmitt trigger circuit implemented already on a breadboard. As seen, the input signal at the non-inverting and inverting terminals of the op amp is the same, but with the addition of a RC circuit in the invertin... |
H: Optical audio transmitter can't handle speech
This is a question relating to my project on an optical audio transmitter.
I wired up a very simple device in which I use an audio signal transformer (EI14) to modulate the intensity of a laser beam (a cheap 650nm, 5mW diode) according to the audio output of my phone. T... |
H: Opamp inverter with bias voltage on non-inverting input
I was reading the datasheet of TDC1000, an ultrasound front-end IC manufactured by Texas Instruments, and had a doubt regarding the biasing scheme (to VCOM) they use for the amplifiers in the Rx path. The power supply for this IC is +5V (VDD) referred to 0V (G... |
H: How to wire a dual output power converter
I am trying to wire a XP Power IZ series dual output power converter. What are the meaning of the pins? Is -V Input the ground from the power source? what about common?
AI: Is -V Input the ground from the power source? what about common?
-V is the negative side of the powe... |
H: Powering 12 V device from 5/9/12 V powerbank
I recently bought the Litionite Falcon powerbank that has one of its outs designed for 5/9/12 V. The 12 V is at 1.5 A which I thought would be enough for my 12 V/0.8 A camera. However, connecting the camera to the charger with a USB to 0.7 mm jack doesn't work. Indeed, I... |
H: ws2812b data resistor
I use an ESP32 with a 3.3v->5v level shifter to send the info to the data line of a 150 led-strip (WS2812b).
It is recommended to use a 300-500 ohm resistor between controller's output pin and the strip.
But the problem is, if I add it, leds doesn't turn on and if I remove it, the leds turns o... |
H: Charging Li-Ion 4S with TP4056 (DC isolation)
I want to power a "suitcase boombox" amp using 4 Li-Ion 18650's. To charge these batteries I'm thinking TP4056, because they're small cheap and have nice charging features.
From what I have read so far that even at first glance having multiple TP4056's with their own DC... |
H: Decoupling capacitors for 7400 type chips
I am currently designing a circuit involving several 7400 TTL series ICs that include SSI ans MSI chips, so I may need to include several decoupling capacitors for the circuit design.
Documentation for decoupling capacitors for a group of 7400 series chips is difficult to f... |
H: Push-pull amp in class A what it mean
I take next sample schematic.
This is only an output stage of any real power amplifier. It's clear when it's work in B-class the every BJT amplify only one half of input signal. But what it means if it works in class A. I know that the current always go through BJT if it work... |
H: DC voltage in collector after active load
I am trying to analyse the DC Q bias point of the following circuits with a current source/mirror involved. I do not know how to calculate by hand the Q2 and Q5/Q4 collector voltages. All the currents and the remaining voltages are easy to get.
Just some thoughts:
Are Q5 a... |
H: Can we form any circuit using half adders only? (assuming we have as many half adders as we want)
Using various combinations on half adders I get these outputs:
{0,1,1,0},{0,0,0,1},{0,0,0,0},{0,1,1,1}
And I also know that we can form any gets using NAND gates or AND and NOT gates but I am not getting any output o... |
H: Project development: control of a DC motor
Is it feasible to control a DC motor as it is described in the following picture?
What would be a possible application of this circuit? It is kind of tricky because the operational amplifier's current is feeding this machine, so I will either need a high power OpAmp or a ... |
H: Is the Diode RMS Reverse Voltage spec important in a DC circuit?
Consider a 12Vdc automotive power supply design where +12V power connects first to a Vc=49.9V bidirectional TVS diode (e.g., TPSMB36CA) and subsequently connects to an SB370 Schottky diode. The SB370 is used for reverse polarity protection and was ch... |
H: Mosfet as a switch for DC motor
The below image shows the circuit schematic:
simulate this circuit – Schematic created using CircuitLab
I wanted to check the turn off time for the mosfet switch varying the pulldown resistance.
resistance=2ohm
Resistance=100kohm
But in both cases there wasn't any noticeable diffe... |
H: High Frequency Transformer Configuration for an Electronic Circuit Voltage Supply
simulate this circuit – Schematic created using CircuitLab
Dear Members,
I could not find this question on this forum and want to have few opinions in this regard.
I want to choose a transformer for boosting around 10V to 30V in a Fl... |
H: Experimental mounting for high power LED
I have bought this UV LED for experimental purposes. I do not want to go to the expense of creating a miniature PCB to mount it, but I obviously need to heatsink it. It is tiny - 3.3mm x 3.3mm and can dissipate up to 3W (when properly mounted and cooled, I assume).
Are there... |
H: Why does M4 turn off and Vout be equal to zero?
From this picture,when\$ V_{in} = V_{DD}\$,I know \$M_1\$ and \$M_3\$ will turn on,and \$M_2\$ will turn off because their \$ V_{gs} \$ are \$V_{DD}\$ and 0 ,but why will \$M_4\$ turn off,and \$V_B=V_{DD}\$, \$V_{out}=0\$ ?
If i know \$V_{out}=0\$ and \$V_B=V_{DD}\$... |
H: Are Gerber files of inner layers interchangeable?
Regarding the Gerber files of a 4 layer PCB with 2 inner layers:
Top layer: Analog signals
Inner layer 1: Digital signals (SPI and I2C)
Inner layer 2: Power planes (+3.3V and +12V)
Bottom layer: GND plane
For better isolation between analogue and digital signals a... |
H: Is a hole in a conductor the same thing as a positive ion?
The flow of current in a (semi-)conductor is often described as holes and/or electrons moving between atoms. In this context:
Is an atom with a hole the same thing as a positive ion (cation), and
Is an atom with an electron the same thing as a negative ion... |
H: Why do most FPV 5.8 GHz video transmitters use PAL or NTSC?
I am not much into the details of video transmission in general. However, I wonder since most displays and electronics are digital, why have suppliers for FPV equipment chosen an analog transmission system, which moreover is limited to 30/24 fps and low re... |
H: Switch between 3V battery and 5V USB as power source
I know there are several other threads with similar questions, but my requirements are different. So far I couldn't find a solution even though I read through several of these topics.
My circuit is normally powered with a 3V coin cell battery. I would like the ci... |
H: Why is a common mode bias required for this differential amplifier?
TI makes the ADS1118 which is an ADC with a programmable gain amplifier (PGA). In one of their application examples (page 4), they indicate that small differential input voltages (1-2mV) must have a common mode bias. This seems unnecessary since co... |
H: Understanding 1N5400 series datasheet
I am using 1N5408 diode in a rectifier circuit. The datasheet can be found here.
I find myself in a very bad state while understanding symbols and meanings while reading datasheets. Can anyone have a look and explain to me what the following terms signify, that is, what do you ... |
H: How to find the required capacitor rating for a circuit?
I am planning a 220V AC to 9V DC rectifier circuit.
In order to provide a stable DC output, I've decided to put a capacitor. But how do I find the rating of the capacitor I should use?
In my circuit, the current flowing will be a maximum of 5mA, and the power... |
H: Measure duration of a non periodic message on FPGA with VHDL
I'm trying to measure the duration of a non periodic signal(message) on FPGA, as below :
I want to measure the duration of the measured signal by counting the number of reference clock's period. I set the first rising edge as the start trigger, but how s... |
H: Finding the equivalant impedence of a circuit
I've been given the above circuit and asked to find the equivalent impedance, however after drawing it half a dozen different ways I cannot find a way to simplify it. I can simulate it, and I get (what I think is the right answer) of -0.934-j1.467 ohms, but I'd like to... |
H: How should I go about protecting a supercapacitor from reverse polarity?
I have several supercapacitors in series, and they're quite old and probably drifted from their original spec by quite a bit. Completely draining them in series will draw at least one of them below 0v. How should I protect against this?
I th... |
H: How to wire a 5V 6-pin relay switching 110V AC @ ~35 W
Update:
Thanks for the help -- working circuit below!
I am trying to turn on a 110V AC array of LEDs with a small 5V relay with some explosive results!! :-)
I am not doing something right as I have successfully blown-up two of my relays...
Relay: HK4100F-DC5V-... |
H: Do I have a true rms meter
I bought an Excel XL 830L multimeter with the understanding that it was a RMS voltmeter.
I also have UEI ElectroMate DM 200.
When I checked the output of my APC unit with both meters, the readings were about the same.
Is there a way to tell if a meter is an RMS type?
AI: Please see this l... |
H: How dangerous is a magnetron?
I took apart a microwave, and when I saw the magnetron, I conviniently remembered that I had heard that magnetrons were dangerous. I decided to research this a bit further (I know, great timing) and I found that some magnetrons contains berilyum oxide, which is fatal if you breathe it... |
H: Power loss in an equally distributed parallel solenoid circuit
I have 12 solenoids (12v rated) connected in parallel to two Darlington arrays (ULN2803A). Each solenoid has 88-ohm impedance. The power supply can provide a stable 12V with up to 2A current draw. (See below)
The solenoids are controlled with 20ms impul... |
H: Why the one-hot state encoding has an advantage in decoding compared to binary state encoding?
Before I asked the question, I've googled advantages of the one-hot state encoding compared to others such as binary and gray state encoding.
I could understand one-hot's advantages and disadvantages over others encoding ... |
H: Why does an automatic bluetooth connect fails after some time?
I am not sure if this is the right place to ask my question. If not, please let me know a better place to ask it.
The question: I have a phone with bluetooth and is connected to a car, so you can use the phone hands-free. And when entering the car with ... |
H: Reducing power consumption of an arduino module (mosfet?)
I'm trying to reduce power consumption on an MP3 module controlled by an Arduino. The MP3 module specs are:
3.2-5V (typical 4.2V)
<1A peak current, 20mA on standby (which is too much on batteries)
In my prototype, I use a simple diode to lower the 5V regul... |
H: Is it possible to get a high efficiency buck-boost converter by switching between the two?
Many buck-boost converters work by boosting to an intermediate voltage, then bucking to the desired voltage. What if instead, it had a separate buck and boost section in parallel, and switched between the two based on input v... |
H: Ideal operational amplifier resistor question
My question is: since the same current flows through R1 and R2 the input current is 0, so can we treat them as resistors in series and add them together? If yes, what would be the expressions in terms of Ohm's law?
Example of the situation:
AI: Yes - you can (you must) ... |
H: Raise of TRIAC A1-Gate potential under load after triggering
During experiments with a TRIAC I noticed that appart from the triggering signal the A1-Gate voltage remains 0V under no load condition.
Under load conditions the A1-Gate voltage remains elevated after triggering up to the moment the TRIAC stops conducti... |
H: Reference ON/OFF voltage from microcontroller Raspberry Pi
I am looking for the simplest way to produce reference voltage ON=1.0V and OFF=0.0V from the Raspberry Pi. I have learned that GPIO outputs are not very precise, and according to Exploring the 3.3V Power Rail, 5V power rail is also not very stable. Howeve... |
H: Design of Arithmetic Section
While going through topic on ALU design. I came across the point.i.e Design of Arithmetic Section .But what confused me is what is it's purpose in ALU. I'm thinking it in terms of performing basic arithmetic operations. I've a picture here. I do understand what is it doing logically b... |
H: 10 W LED COB on 12 V
So say I have a 10 W LED, most have a forward voltage of 9-11 V and a maximum current of 700 mA.
If I wanted to connect it up to 13 V (a fully charged SLA battery) couldn't I simply do 11-13=2 (LED drops 11 V and rest is across resistor)then 2/0.7 = 2.85, meaning I would need a 2.8 ohm resistor... |
H: How to add external GPIO interrupts on STM32?
I'm trying to configure STM32CubeMx to external GPIO interrupts, however, in the NVIC screen I don't see an EXTI... interrupt to be set.
What should I do to be able to e.g. check for interrupts on GPIO pin PB14, PB13 and PB12?
AI: Click on the pin you want to configure,... |
H: Transistors on a LED strip PCB
I replicated the schematic of a cheap LED strip that I bought. Can someone explain me what does the transistors do in that circuit? It has a input voltage of 12 volts.
AI: Here's the schematic drawn in a fashion that may be a little more understandable:
simulate this circuit – Schema... |
H: Is it possible to make a coil-less simple Shortwave Receiver
I am really a newbie here in Electronics and I'm into it as a hobby/passtime.
I was going through this simple coil-less Shortwave Transmitter circuit on a blog.
Q1 – BC548, X1 – 10.7 MHz ceramic resonator, 3 terminal, C1 – 10 nF, C2 – 100 nF, C3 – 100 pF... |
H: Basic circuit analysis
Note-This is not a homework problem,my question is different.I am currently confused understanding some basic behavior in a circuit.
Question-Why A is not 10 volts and B 0 volts?What stops Point A from having voltage 10v?
AI: I think you have a problem understanding the nature of electrical p... |
H: Declaring vector variable in the Verilog not starting with the MSB(e.g,. reg var[0][20])
I am familiar to the syntax described in here
net_type [msb:lsb] list_of_net_identifiers;
reg [msb:lsb] list_of_register_identifiers;
For example, to declare the 32bits memory address, I could use the syntax like
reg [31:0] a... |
H: ReqForHelp: Understanding Vf relationship to supplied V and A
Context:
I am a beginner tinkerer at electronics. Conceptually a lot of this is hard for me. But, I plod on. I very much like to use free salvaged components for all sorts of projects, and continue that by salvaging parts for electronics learning/project... |
H: Why two seperataly doped semiconductors cannot be joined to form a junction?
My textbook says that when a slab of P-type semiconductor and another slab of N-type semiconductor are joined, they cannot form a junction because no matter however smooth the surface is, there will always be some irregularities present in... |
H: Why does low frequency audio take up more power
When I say more power, I know that fundamentally it takes more energy to move the speaker cone to produce lower frequency audio. However, in my experiences, higher frequency content takes up something like x10 less current than its lower frequency counterparts, and th... |
H: Net Tie - Design Rule Error in Altium Designer
I am designing battery charging system. Datasheet of IC's says "Connection of switching ground to system ground, or any internal ground plane should be single-point." on PCB layout considerations. For this reason I decided to use "Net Tie" between GND and PGND.
I creat... |
H: Ribbon cable PCB connector repair
I've been asked to help repair a keyboard. On examining the keyboard I found the issues (circled) in the below image:
A tear in the middle of the ribbon cable
A tear across the end of the short side of the cable where it entered the PCB connector
My original idea to repair this ... |
H: Differences between notch filter designs - use of op-amps
I have a question about notch filter designs using op-amps and I hope that you can help.
Following this tutorial https://www.electronics-tutorials.ws/filter/band-stop-filter.html, they give examples of different notch filter designs. I'm interested in the de... |
H: WeMos self-turn-off with N-channel MOSFET
I'm trying to build an internet-connected button. When button is pressed, WeMos D1 turns on, makes a network call and then cuts off the power by pulling the irlb8721 gate to LOW.
Video: https://photos.app.goo.gl/QEpIgPa3gxHatTyG3
Here's the program I currently use for test:... |
H: Analysis of simple RC circuit
For the above circuit,
Natural response will be A×exp (-t/RC) where A is any constant.
For forced response, capacitor is open circuited consequently, 10K resistor is also removed and thus, forced response is 10Cos (2t).
Plugging into the eq. For V (t) and solving at t=0 I get A=-5. B... |
H: Good book on system identification for non-linear systems?
Can anyone suggest a good book that describes how to experimentally identify and describe non-linear behavior in real world systems? I have had good success analyzing systems using linear methods such as fitting transfer functions to real data. However I fi... |
H: May I replace ICR 18650 22F with 26H in Laptop battery?
As in the title, I have a worn laptop battery, made out of 6x SAMSUNG ICR 18650 22F. Now I can't find any 22F near me, nor slightly farther for a sane price. But SAMSUNG ICR 18650 26H are practically swamping me from all sides.
I checked the basic specificatio... |
H: How to recognize a Germanium Diode
I am in a little trouble and seeking some help. I got a bunch of mixed up diodes from an old collection. I know there are few diodes which are Germanium Diodes. But they look so similar to 1N4148 and similar transparent case diodes. The problem is, the diodes are old (but working)... |
H: If a sweep generator gets up to 20 GHz, Is it possible they only mean pulsed DC rather than AC?
I'm looking at a Wavetek model 8911 10 MHz-20 GHz Programmable Sweep Generator, It says it gets up to 20 gigahertz, but is it possible that it only generates pulsed DC at that frequency as an excuse to say it gets "20 GH... |
H: current source with high resistance load
what happen if the load is a high resistance ( let's say 100K )
AI: The more the load resistante increases, the less voltage you´ll have in the 1k resistor, due to the fact you won´t be able to source 1mA as load resistance has increased and power supply is 10V. That 1.6V w... |
H: Trouble understanding timing simulations in Quartus?
I have tried my ALU on the functional simulation and I get the correct waveforms. However, I am confused about how to interpret the timing simulations.
What causes the ripples in the carry_out, and zero signals? Also, what causes the delays in the result?
AI: Fro... |
H: Priority MUX - select one of the options based on previous value
I have several workers that need to access single bus (memory channel). Several of them can be ready at the same time and I would like them to alternate with writers having priority.
I have some pseudo-code with two writers and two readers to showcase... |
H: 'Simple 220V' relay with a 36W LED Par light
I have the relay below, it has 3-7 input voltage needed for the control signal, I'm using a STM32F103C8T6 which is 3.3V and it is able to control the relay successfully.
For testing:
- The top left connector is connected to 3.3V (from the same STM32 via the horizontal br... |
H: Understading p_MOSFET driver
I have a very dumb question in understanding p-MOSFET driver. simple BJT voltage divider or totem pole driver.
first i will ask Simple BJT driver.
During turn ON, Q1 is ON, MOSFET gate charges to v1/2 through the path in violet(from V1 current flows to gate to GND).
During Turn OFF, Q1... |
H: How do I know what power rating pots need?
EE novice here. In this post on reddit, the author wonders if 125mW-rated potentiometers are usable in the MFOS Noise Toaster. The Noise Toaster drives analog audio circuitry off a single 9V battery and AFAIK there's no voltage boost circuit involved.
I believe that despit... |
H: Micro USB Type B Splitter?
Is there a way to connect multiple (around 3-10) devices with a single micro usb-b cable?
Planning to do something similar to this:
With the end result to hopefully have all devices synchronized so that navigating to one site on one device will in turn navigate to that site on all device... |
H: Nyquist Sampling Rate Problem
I am really confused with the above problem. I doubt the solution.
According to me,
Sampling Frequency of x(t) = HCF(5,12.5) = HCF(5,25)/LCM(1,2) = 5/2 = 2.5Hz
Sampling Frequency of y(t) = 3x2.5 = 7.5Hz
Nyquist Sampling Rate = 2 * 7.5 = 15Hz
Where I am doing the mistake? Please help m... |
H: Why is the inverter need in this ALU?
I'm studying computer architecture and I wonder why the inverter is needed in this ALU?
AI: Inversion of an input is used in some operations, including but not limited to subtraction, XNOR, and of course inversion. It can also simplify some operations when used as an input of a... |
H: Why is the load on a darlington pair put before the transistors rather than after?
Forgive my lack of understanding and if this is answered somewhere I have not found, but...
I have seen lots of answers with regard to how to use a darlington pair to switch, say, a 12V 1A load using a 3.3V 50mA signal (just an exam... |
H: Voltage drop across a resistor
I have been trying to figure this out, kinda a amateur question actually! Looking at the above circuit diagram am wondering why there is no voltage drop across the resistor R1? A part of voltage should be dropped out by the R1 isn't it?
But the simulation in Proteus shows that the V... |
H: Diode in MOSFET symbol
Is there any difference between MOSFETs with a diode in their symbol and the HEXFET?
Also, is there a difference between MOSFETs with a diode in their symbol and other MOSFETs?
AI: MOSFETs with a diode in their symbol are power MOSFETs, i.e. a class of MOSFETs whose structure has the channel... |
H: Is mains 220 VAC rms, peak to peak or max amplitude?
Please excuse me for such a basic question, but I can't seem to find a clear answer to it.
When we say that mains power is 220 VAC, or 230, 110 or whatever value, is that the signal's amplitude, the difference from peak to peak or the RMS value?
AI: When we talk ... |
H: GPIO output corrector
It was suggested to me that GPIO outputs on Raspberry cannot be used as a reference voltage: for example GPIO TRUE might give only 3.2V and GPIO FALSE could give 0.1V. On the other hand, according to Exploring the 3.3V Power Rail 3.3V rail should be rather stable . What I want to do is to co... |
H: Connecting a PhilipsHue led output to a relay
I followed an Instructables tutorial to get some understanding of what pins can be used from the Hue light bulb.
Out of all the "exposed" pins, I focused on
TP1 - Ground
TP6 - LED output
(basically the top-left connector pins)
So my end-game is to have a relay contr... |
H: How to analyze analog output waveform in Modelsim
I want to analyze an output sine signal from my VHDL code in Modelsim. I have created a project and simulated the code. However the outout in the "Wave" window is in binary form represented as a 32 bit output. I tried to change my signal as a Analog signal in wave p... |
H: Full AM signal vs DSB-SC
I conducted an experiment where I constructed a Full AM signal and changed the message signals amplitude to change the modulation index of the Full AM signal. I then increased the amplitude of the modulator chip until a DSB-SC signal was made. Although they look really similar, I was wonder... |
H: LM317 voltage regulator with high current boost by 3 npn transistors
I am building a rectifier (~230V+-10%/50Hz) with voltage regulator from scratch. My output needs to be 3.3V with a maximum current(before short-circuit protection trigger) of 16A.
I have chosen three npn transistors in parallel to boost my curren... |
H: Bit sequence from USB HID Joystick
I wanted to connect a USB HID Controller to an Arduino and use it to control a Remote Controlled car.
But I'm unable to find what bit sequence is sent when a button is pressed on the joystick. I would like to find what that sequence is.
I'm running a dual-boot system with both Lin... |
H: Need help understanding the status output generation of an ALU
I'm currently trying to implement a simple processor using Verilog in a FPGA. I'm using Mic - 1 architecture as a reference model.
The thing I can't understand is the ALU is generating a "status" output when a certain operation is completed. How the AL... |
H: Do waterproof RJ45 connectors with integrated magnetics exist?
I've been searching for days and can't seem to find a rugged RJ-45 Ethernet connector with integrated magnetics. Probably it would be good enough if the connector was just potted so water cannot leak through.
Is there a reason why such items don't exis... |
H: Is it possible to recover an over-modulated waveform?
Is it possible to recover an over-modulated waveform? I have searched the net up and down but I constantly come across the same answer 'It is not possible to fully recover a full AM signal using an envelope detector'. I do understand this as an envelope detector... |
H: High Step-up Ratio DC-DC Convert (12V-to-150V) - Boost, Flyback, Coupled-inductor Boost?
I am trying to design an on board DC DC converter that generates 150V from a 12V input. I'd like to design it to handle at least a 30-50mA load, but in reality the load will most likely be smaller. The output does not need to... |
H: Digital Potentiometer Capacitive Feedthrough?
I am trying to use a digital potentiometer to reduce the amplitude of a square wave. I am getting what appears to be capacitive feedthrough on the rising and falling edges. This is getting amplified by later stages and causing glitches in the output.
Looking at the sco... |
H: Reading from Analog Magnetometer with Raspberry Pi
I'm trying to read an analog magnetometer using the Raspberry Pi Zero. I never worked with the Pi directly before; it was always through an Arduino hooked up to the Raspberry Pi. However, through research, I found that the Pi doesn't really play well with analog se... |
H: Is it a good idea to connect a line buffer to ground?
Got a quick question.
I'm dealing with 74VHC125BQ,115 and I won't be using one of the line drivers; the rest are connected to UART. So, I'm wondering what I should do with the last one. Is it a good idea to ground its input or should I just leave it floating.
A... |
H: SN74LS181: The comparison function, A=B, not operating
I have six SN74LS181N-B circuits for arithmetic functions. I intend to utilise the A=B output, which is the comparison function. Sources have indicated that this function operates, if subtraction is acted, and the output word, (F), is 1111.
However, this does n... |
H: Board to Board connection for RF and high-speed digital signals
(I hope this is not regarded a "shopping or buying recommendation" question - in my opinion it is not).
In order to split a larger project into more tractable and flexible sub-blocks I create two PCBs (motherboard/daughterboard).
This is a very common ... |
H: Why the control hazard is worse for deeper pipelines
I'm studying compute rarchitecture and read that "control hazard are worse the deeper the pipeline is". But why is this the case? Is the branch deeper and therefore takes longer time to run?
AI: If a control hazard isn't taken care of properly, the program is for... |
H: STM32F10x DMA a constant value
does anyone know if it's possible to DMA a constant value using the STM32F103? I've scrutinized the datasheet but can't see anything obvious and nothing via Google either. Could do a single word in circular mode of course but it would be nice to avoid the bus access.
AI: Yes this is p... |
H: Stacking UDN2981 ICs for more Amps
Kind of a novice question but I wanted to check if I am right about something. I like the convenience of the UDN2981 source driver to provide switched power to for multiple loads. However, I would like to drive loads that requires about 1.5x higher amperage than the specified limi... |
H: 240 V AC to 5 V DC power supply recommended fuse
Admittedly this is quite a novice question but I just wanted to make sure before I start a potential fire as this project is destined for an enclosed space behind a gyproc wall...
I picked up a Vigortronix 230 V AC to 5 V DC PSU to power a Pi Zero W and camera. I'd ... |
H: DC power supply - battery charging
I want to charge Lead acid battery (12V, 55Ah) I have adjustable DC power supply (I can set voltage and limit amps). Do I need to put resistor in between power supply and battery? If so.. how much Ω ?
AI: Resistor will not be required, you may limit the current to 1/10th of the ba... |
H: Determining the voltage of a network branch
[NOTE-This is a not a homework problem and i am not asking anyone to solve it]
Recently I have been simulating some basic circuit analysis problems in a simulator to get a better feel of the topic.Today i came across this problem----
Now the problem that i faced is that i... |
H: Why can a MOSFET be used as an amplifier?
This is a fundamental question which I am struggling to answer after familiarizing myself with the MOSFET and analyzing different circuits containing MOSFETS.
In terms of GDS channels, what enables a MOSFET to be used as an amplifier?
I know that
Transconductance relates ... |
H: Driving a filament
I have a filament that needs 1V, and is rated at 50mA at 1V. I would like to use 5V supply for it, and I am wondering, how to approach this. 50mA at 1V means that the resistance is 2k, as per Ohm's law.But it changes, does it not, as it heats up?
1.) I thought about adding a 8k resistor in series... |
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