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H: How can I read from an accelerometer through i2c/spi for ~1 second at frequency>2kHz with precise distancing between measures
Context
goal
My final goal is to perform an fft on acceleration signals with specs at least:
band between ~10 and ~1000 Hz
spectral resolution ~1Hz
on a portable, cheap, low-power device.
... |
H: Demo of designing a modern CPU in Verilog/VHDL
Please help me understand how such huge and complex devices like modern CPUs' are designed - would it be possible to see an example of some final circuit with billions of transistors made with Verilog/VHDL? All examples on the Internet show only small ICs. I would like... |
H: Dual (additional) battery E-bike solution
What would be better solution when attemptng to install additional battery on E-bike:
Parallel connection and increasing total Ah (batteries are from different manufacturers).
Idividual usage of each battery and switching after main battery is certain % auto or manually.
... |
H: RTC circuit supercapacitor charge/discharge doubts
This is my current RTC circuit...
Supercapacitor = DXJ-5R5V334U (ELNA)...
DXJ-5R5V334U = 0.33F, 5.5V, ESR = 150 Ohms
Resistor = 150 ohms 0603 100mW 1%
If I consider only the resistor, I have a RC constant of 0.33 * 150 = 49.5 (~50) seconds... 50 seconds x 3 = 150 ... |
H: Dali Light Addressing: How to?
As I am trying to create a program that addresses the various luminaires, I wanted to know better theoretically not the commands to give, but why I am giving that specific command.
I've searched for a long time to find also examples about Dali2 addressing light commands.
Then I found ... |
H: Calculating RAM memory capacity from schematic symbol
Is it possible to calculate the memory capacity of a RAM given its schematic symbol?
I made a first guess from an example but seems to be incorrect:
If the address bus is 15-bit width, there are a total amount of 2^15 = 32768 addresses
If the data bus is 16-bit... |
H: Why are cables rated for current not power?
I was wondering, since resistors are rated for power, not current (so one can blow them with both overcurrent or overvoltage), then why are cables rated only for current? Aren't resistors just stacked up wires? The question could be also asked in reverse- why are resistor... |
H: Can I produce small signal gate-source voltage by applying small signal source-drain current?
As stated in the title, Can I produce small signal gate-source voltage by applying small signal source-drain current? There is no doubt that I can produce Ids by applying vgs, what about the other way around?
AI: Yes you c... |
H: Why is there a low pass filter in a DSBSC demodulator?
In analog communication, DSBSC (double side band suppressed carrier) is way of modulating signal.
In this the carrier is simply multiplied with the message signal.
At the demodulator, the carrier is multiplied back which gives the message signal back.
The fir... |
H: LTSpice AC analysis and DC analysis don't agree?
I have a simple circuit pi circuit. When I do the math and subsequently run the simulation on LTSpice, I get a similar answer - the resonance occurs at f= 217447Hz (math), 217450(LSpice).
The error log shows the following measurements:
.meas AC maxVout MAX mag(V(vo... |
H: What is the polarity of this capacitor?
I have a MAL213836109E3 axial capacitor. There's a stripe on one side of the capacitor, but it isn't a tantalum capacitor. Does it indicate + or - in this case?
This is the DigiKey link to it: https://www.digikey.com/en/products/detail/vishay-beyschlag-draloric-bc-componen... |
H: How can I measure a voltage between two conductive surfaces that are completely isolated?
I am in the middle of diagnosing an issue where the case of my battery box (steel) is floating at a potential of 120V relative to the negative terminal of the battery (350V). I've started removing connections but in this proce... |
H: Why did my transformer explode? Was it faulty?
I purchased a dual-voltage step-down transformer. It had 3 input leads for either 115V or 230V and could output either 12V or 24V on the center-tapped secondary. I taped off one of the input hot wires and connected the other two to a wall plug. I then connected the thr... |
H: Maintaining constant voltage at end of long wire
I have a long 1 mm wire, about 1.5 meters long (and 1.5 m back). At the end of a wire I have a device that requires 3.7 V and can pull anywhere from 0 to 6 A at a time. However, when it pulls a high current I am noticing that the voltage drops and the device shuts do... |
H: Circuit analysis with 2 diodes : Constant Voltage model
It's a problem about sketching V_in V_out characteristics(sketching graph with V_in as x axis, V_out as y axis) with constant voltage model in different V_D,on (V_D1,on != V_D2, on)
Starting from V_in = -inf, both D1 and D2 are turned off : (D1, D2) = (off, ... |
H: Unknown pads on board
I'm analyzing a board for some device (game handheld console). I've found a simple SPI flash on it (W25Q) but there are 2 pads exposed for what I assume is factory testing (there are no other pads exposed on the whole board). The thing is, those pads are the ones for /CS and DO. However, as fa... |
H: STM32 enabling clock for port C sets IDR bit 1
Why does enabling the clock for port C set the IDR bit 1?
It's the configuration for a Nucleo-F767ZI.
AI: The default mode of the pin is as an input, as soon as you enable the peripherals clock (well, a few clock cycles later), the pins state is clocked into the IDR.
S... |
H: ALD1106/1107 transmission gate "off" state behaviour in LTSpice
I am making a transmission gate using ALD1106 NMOS and ALD1107 PMOS model files. For -5V (to NMOS and +5V to PMOS), with input 5V, the output should come 0 as the transistors would be in off state. But the output is coming 5V.
What is working: When NMO... |
H: Interference suppression coils for 9V DC adapter for audio equipment
I am about to add voltage regulation to an unregulated 230V AC to 9V 150mA DC adapter, by adding an L7809 voltage regulator and ceramic 0.33µF and 0.1µF capacitors.
I want to use this adapter to power a couple of (digital and analog) guitar effect... |
H: Feedback schematic/pcb 16 channel relay wifi module
I have a few questions about a 16 channel relay module I designed, maybe someone can help me. Generally this consists of a ESP-12F, two I2C IO Expander, two darlington array ICs to drive 16x 5V relays.
Here is the whole project page.
Channel 9-16 is equivalente ... |
H: Transmitting digital signal long distances, without complex parts
I'm controlling several multiplexers from NI DO modules. The multiplexers channel select inputs, A0-A4, are 5v. The DO modules output 5v TTL. On the bench I have everything working exactly the way I want.
Real world application is going to require... |
H: What design should I use to clean up this pulse wave?
I'm using common voltage controlled oscillator IC - AS3340.
It has some problem with pulse wave output on higher frequencies. The bottom of falling edge looses sharpness the higher I go.
This is how it looks at the limits of audible threshold:
I need some advic... |
H: Trying to increase resolution of ADC using an op-amp
We currently have a circuit measuring a thermistor in a water tank, passing through a couple of voltage dividers and then plugging into an 12bit ADC which eventually interacts with a microcontroller and solenoid to help regulate a cooler for the water tank temper... |
H: Protecting ADC Input inrush current
I'm currently using a 5V current transducer that's connecting to an I/O device ADC input. I'm trying to protect my ADC input from going over 5V by using a zener diode . The reason this is coming about, is a current I'm trying to measure has a high inrush current on start up, and ... |
H: Why do I need to put a low pass filter in front of an analog to digital converter (ADC?)
Is the low pass filter in front of the ADC just to filter higher frequencies or does it serve another purpose?
I am talking about the ADS8320 ADC.
AI: A low pass filter is needed for most analog to digital converters (ADCs.) ... |
H: N-MOSFET Gate to Drain short circuit configuration and Vgs
I notice that in solution manuals to problems like these, when the gate is shorted to the drain on an NMOS, Vds = Vgs. So Vds >= Vds - Vtn, making the MOSFET always in saturation.
I do not understand why this is, and have not been able to find a diagram tha... |
H: Turn on LED if certain voltage range is detected
I'm new to circuits and in a side project I'm trying to design a DC circuit without microcontrollers that will turn on an LED if a certain voltage range is detected. For example the LED turns on if there's a voltage over 1.2V on a certain node. I'm not sure what comp... |
H: How many bits of information does a voltage of 0-5V , with accuracy of ±50mV convey?
In my intro to logical design class, we were shown this simple question as one of the first examples for the exercises we will have. The question was:
An analog voltage is in the range of 0–5 V. If it can be measured with
an accura... |
H: Can I fabricate a PCB using this schematic?
I am a newbie to schematic and electric circuit design. This is one of my first schematics and I am thinking of making a PCB out of this one.
I want to ensure my PCB will work after fabrication. It uses an ATmega328P as microcontroller and also has an MLX sensor, an LCD a... |
H: Equation for square law circuit modulator
For DSBFC AM (double side band full carrier amplitude modulation ) the message signal \$m(t)\$ must be multiplied by carrier maybe $$ A_c\cos(\omega_c(t)) $$
(For modulation)
This modulation is done in reality by using the non-linear characteristics of the diode, where
$$ i... |
H: two independent zones from central heating unit
I have a central heating unit (a pellet stove) for a two floor house. I'd like to control it independently from two thermostats.
The stove at the moment is controlled by a single thermostat input and it turns on and off a circulator pump with an internal logic board. ... |
H: Is it possible to have a 2-in-1 USB device that is a Flash Drive and Power Bank?
I spent over an hour with no luck looking for a device that would provide flash storage and provide charging power to another device at the same time. I would think this would be possible as you can plug a phone into a computer and re... |
H: How can I fix this LED dimmer circuit?
simulate this circuit – Schematic created using CircuitLab
The circuit reverse-engineered above is a LED dimmer which is driven by 555 timer in astable mode which then drives an op-amp to provide current for the gate of the MOSFET. The circuit dims quite well but it has an is... |
H: Cause of delay in CAN
I am dealing with a differential drive robot that interacts with several motors and actuators, all through a powerful NVIDIA Jetson Xavier. The Jetson runs Ubuntu and I use Python3 for programming all actions of the robot that go through a microcontroller via CAN bus.
Now, there are multiple p... |
H: Why is op-amp output not zero if inputs have the same voltage?
I have started learning about op-amps and have a question. If Vout is the gain times the difference in voltage at the inputs, why is Vout not always zero if we assume the voltages at the inputs are the same due to the golden rule?
AI: I think your confu... |
H: Using an LM358 as line level buffer
Recently, I've acquired an old SNES, specifically the SNSM-CPU-1CHIP-03 model, with no audio output.
I traced the issue to a dead S-Mix chip, essentially a buffer between the audio DAC and the line output.
While the DAC in question, an LM6379A, is technically capable of driving t... |
H: What resistor wattage with rectifier and capacitor?
I have tested a classic full bridge rectifier:
simulate this circuit – Schematic created using CircuitLab
I haven't yet connected the load (a relay switch whose coil has 90 ohms).
The result was that the R1 burned.
I guess I need a higher wattage R1, how do I kno... |
H: Is there any dedicated IR receiver IC with atleast 5 output pins
I want to know if there is any IC available that can decode an IR remote to its different pinouts or I have only option to program a microcontroller to achieve it.
AI: Seemingly you expect something which has 5 separate outputs which can be activate... |
H: Using TL071 at 455 kHz
I'm experimenting with op-amps and ceramic filters at 455 kHz. I chose TL071 because it was readily available and the datasheet specified a slew rate of 13 V/μs and a GBW of 3 MHz. But in the datasheet it shows that the large signal differential gain drops dramatically after 100 Hz.
My Ltsp... |
H: Which integrated circuit can I use instead of multiple MOSFET?
I have designed a circuit using a combination of NAND, NOT, AND and OR gates:
I know how to build this circuit with MOSFET using CMOS technology but it requires 18 MOSFET. I would like to know how can I build the same circuit using an integrated circui... |
H: Torroidal transformer design help needed
I have an idea for a simple circuit that I'd like to use to detect current flow in regular (US) AC household 120V, 60 Hz power. All my electronics-making friends told me, of course, that there are numerous current sensing ICs on the market now, and that's true, but I'd like... |
H: Why does the datasheet only has one input bias current value?
There should be two input bias currents, one flowing into or out of the inverting input and the other, the non-inverting input. Their difference is the input offset current. A typical datasheet only states one value for the input bias current. Is that bi... |
H: Why is there a LC filter in front of the DC/DC converter?
I have to study this circuit. I understand that Graetz's bridge is there to convert the current to positive, but why is there a LC filter at the entrance of the converter?
AI: why is there a LC filter at the entrance of the converter?
That looks like a nois... |
H: How is the effective parallel resistance of this resistor network determined?
I have this circuit:
The effective resistance at the reference node of D4801 is given as
Rb = R4802||(R4805+(R4807||(R4806+R4808+44KOhm))) = 9.129KOhm
I am not able to understand how this formula is arrived.
Shouldn't it be, Rb = R4802||... |
H: About smd capacitors values and voltage rating
My Dell 3542 (2014)laptopboard got failed...i tested the board,and i found 4 smd capacitors have fialure...there is no any thing on the board to inform me about the value or voltage rating of them except the the 4 capacitors have the following numbers,c4925,c4926,c4927... |
H: Two separate heatsinks leads to less volume than one?
I am currently designing a heatsink to handle the heat from a diode and a MOSFET. I can pick either two or one heatsink, and my goal is to minimize the volume of the heatsink.
Intuitively I would think that one heatsink for both the MOSFET and the diode would le... |
H: Voltage is 0.05 when switch is closed
I am new to electronics. Iam designing a simple circuit where I have to make a digital switch:
Here is what I have designed in Proteus:
There are 2 issues:
I want it to output 5V when I close the switch but it does opposite. It outputs five when the switch is open.
When s... |
H: Is Lora maximum transmission 1 km in real?
I'm new to wireless communication and Lora.
I'm using Lora Ra-02 and Arduino UNO and small 800 Mhz antenna.
I'm using Arduino website library.
How can I increase that range? What do I need to do to get that 2-3 km urban range?
Does it need line of sight even in short dist... |
H: What is the maximum voltage I can set up on the AFG2125 function generator?
So, I'm picking up signals to work on the lab with the AFG2125 function generator. I have this generator on the lab https://www.gwinstek.com/en-global/products/downloadSeriesDownNew/5412/442 and on page2 it says:
AMPLITUDE RANGE <20MHz : 1... |
H: Differentiating Equation containing modulo operation
(DC motor Single Loop setup)
I have the equation for flux containing mod operation of the angle as an independent variable.
the graph:
The textbook then directly derives the derivative of flux for the calculation of emf as follows:
My question is, where did t... |
H: DC to DC boost converter low frequency
I am looking for a DC to DC boost converter constant current with very low switching frequency to pass EMC.
Vin- 12V
Vout- 36V, 100mA.
Any suitable device for my above application?
AI: Build a Royer oscillator, the voltage step-up is mostly determined by the turns ratio of ... |
H: Terminating an audio line-in signal when source is disconnected
I've been trying to DIY a home audio setup. We have a pair of speakers in the ceiling of an upper floor (previously installed), and a new TV on the same floor. We wanted the sound of the TV to come out of the speakers.
The speakers are connected to an ... |
H: How does moisture get into silicon chips?
Many chips have Moisture Sensirivity Level rating (MSL)
I am trying to understand how exactly moisture can get into a silicon packaged chip. Every document I read just states it can, but doesn't say how. E.g. this one from TI:
Once the dry pack bag is opened, moisture from... |
H: Voltage of parallel components (RLC circuit)
Say we have the circuit above.
The 6 A current is applied at t=0.
I'm trying to get the voltage across the inductor to get di/dt.
If I run this circuit in LTspice, it will show a voltage of 30mv across all nodes. I'm not really sure how I get the 30mv. I was thinking th... |
H: Magnetoresistance from self current
I have done this question on physics forum but for some reason my question didn't receive any attention there(maybe because physics site is for theoretical physicists mostly) and I have this question.
When there is current in a wire, a magnetic field is created around the wire. W... |
H: MSP430 Timer Interrupt Not Triggering
I'll post my code below.
The problem is that the MSP's ISR_TRAP function (a function that handles ISRs that are not otherwise handled) is triggering and trapping me in its endless loop. This happens after P2.1's ISR has successfully triggered, and before the Timer B ISR does an... |
H: Normally open capacitive sensor with MOSFET is closing relay, how can I make it open?
Would love some help here, I know next to nothing about electronics.
I've been asked to fit a normally open (NO) capacitive sensor to a MOSFET to operate a relay.
My problem is it is working backwards to the way I need it to.
I ha... |
H: Why is this relay turning on when booting up/shutting down my Raspberry Pi?
I bought this relay from Amazon.
I'm trying to use it to turn power on/off for a stepper motor I'm using. I've previously used a single channel relay for this which turned on when the signal was HIGH and off when the signal was LOW. It seem... |
H: How to make one switch control multiple identical subcircuits?
I have an audio circuit with 8 identical subcircuits (one for each voice).
In each subcircuit or voice, a resistor controls one aspect of the sound.
I would like to have a switch which allows me to switch between two different resistor values in that pa... |
H: Connect crystal to low jitter clock generator
I have this TSX-3225 25MHz crystal. It has two outputs (pin3 and pin1).
I want to connect it to the CDCM61001 low jitter clock generator. The CDCM61001 has one crystal input (XIN).
Should I connect one of the two outputs to XIN and tie the other one to ground?
the TSX-... |
H: Getting the transfer function of a parallel RC circuit. Am I allowed to simplify/remove the component I am trying to solve for?
simulate this circuit – Schematic created using CircuitLab
Say we have that simple parallel rc circuit and we were tasked to get the transfer function of V_c(s)/V_i(s). We were told that ... |
H: Is a transfer function of a hole system BIBO and asymptotically stable, if the poles of the two sub systems shorten each other out?
I have the calculated the transfer function of system one $$
G_{1}(s) = \frac{-(s-2)}{(s+1)^2}
$$
and of system two
$$
G_{2}(s) = \frac{s+2}{s-2}
$$
Now I have to check if the hole sys... |
H: Meaning of $ within LTspice netlist
I am trying to further understand the .cir file I have downloaded from Infineon that I am using to model some of their mosfets in LTspice.
In the below example can anyone explain the lines starting with X$M? I can't find this format in any notes elsewhere
(note: Z27 and Z28 are ... |
H: RS-485: what happens when bus contention occurs
I'm refering to an half-duplex RS485 application which consists of a master and multiple slaves like in the circuit below (I'm using an ST3485).
simulate this circuit – Schematic created using CircuitLab
From my understanding, the drivers outputs are tri-stated (high... |
H: Decoupling capacitors for ADC
I have this ADS6125 adc. In the datasheet it is written that this ADC uses internal decoupling:
"capacitors on-chip eliminates the need for external decoupling" (p.45)
"As ADS612X already includes internal decoupling, minimal external decoupling can be used without loss in performance... |
H: Making AND and OR gates using the projection gate
Is it possible to make the AND logic gate or the OR logic gate by using only q or p projection gates?
The q projection gate truth table:
P Q R
0 0 0
0 1 1
1 0 0
1 1 1
The p projection gate truth table:
P Q R
0 0 0
0 1 0
1 0 1
1 1 1
AI: Assuming I am reading your no... |
H: Do electrons go towards higher voltage or lower voltage?
Can someone clear this up for me once and for all? I feel like Thomas Edison really screwed me when he made everyone believe that current is movement of positive charges.
Do electrons go from high voltage to low voltage or from low voltage to high voltage?
AI... |
H: How does input voltage ripple affect output voltage of linear regulator?
The problem starts with my 3D printer which is powered by a 12V SMPS. When it drives a heavy load such as heated base and hot end, it causes a ripple on the 12V rail. Also it affects the 5V rail with the same ripple as the image shows.
Note: M... |
H: Why does converter's efficiency degrade with higher V_IN?
Please consider the following efficiency graphs of the exemplary MP2384 buck sync converter:
What I am trying to understand is why is the efficiency at light loads worse for the cases in which the VIN value is a lot higher than the VOUT. In the end, the eff... |
H: H Bridge Gate Driver Current Sensing
I want to build my own 120A Electronic Speed Controller and decided to try it with the DRV8305 IC. I am by no means a hardware expert, so go easy on me.
On page 45 of the DRV8305 datasheet: https://www.ti.com/lit/ds/symlink/drv8305.pdf?ts=1603013837741&ref_url=https%253A%252F%25... |
H: phono preamp input stage - exotic design
I found a very exotic (at least for me) moving magnet input stage of a phono preamp. It's taken from an old cartridge measurement system from renown brand. I simply can't figure out the logic behind this circuit.
Applying "hot" signal to both inverting and non-inverting outp... |
H: Why does the voltage drop when powering, then reverse when disconnecting this electromagnet?
I've just bought a 12V 260mA electromagnet and I have some questions about it
I don't know why, but when I connect electromagnet, my 12V power source (9V and 2 1.5V AA batteries in series) drops to 8V. I suspect that this ... |
H: Modelling an STM Tip current
As part of a current-to-voltage preamplifier that I'm working on improving, I'm trying to model the current source of an scanning tunneling microscope (STM). The way it works is described below (based on my understanding), with the block diagram shown below. Given a material sample, it ... |
H: How is this circuit a negative resistance oscillator
I found these oscillator configurations(all are similar) at various sites on the web, but here and here the author says its a negative resistance oscillator. It's a popular oscillator among amateur radio enthusiasts due to its ability to oscillate at a wide range... |
H: How do I combine outputs in Simulink by changing a specific parameter?
I am studying a Cruise control system, and I want to change the coefficient of rolling friction and put them together in one graph keeping the remaining parameters the same. How do I store all the data in one graph?
AI: Combine the signals with ... |
H: What does a transceiver like MAX 483 do, especially when it is connected to RS-485?
I cannot understand the principle that the transceiver uses. Why do we need to connect it to RS-485, and how is the data transmitted? I mean how does it transmit the data and why? It is like I cannot understand the concept.
These ar... |
H: Why do we use PQ and PV buses when solving a power flow equation?
It seems like it would be much easier to just use the admittance matrix and measured voltages to find all the currents and then just use that to get all the power flows. Why not this instead of the PV, PQ iterative solution using Newton Raphson?
AI: ... |
H: How to handle delta function after finding the impulse response?
I am pretending that laplace does not exist because I am being tested on these concepts separately.
Essentially, I have solved for the step response of a first order circuit and found it to be:
$$v_{c}(t)=\left(\frac{-5}{99}e^{-5t}+\frac{106}{99}e^{\f... |
H: input capacitor for buck converter
To calculate the input capacitor for buck converter, I follow TI Application Report SLTA055–FEBRUARY 2006 "Input and Output Capacitor Selection".
It says to determine the input capacitor "75 mVpp is recommended for maximum input voltage ripple. This will yield approximately 22 mVr... |
H: Details about driving circuit of mosfet
I want to know the reason behind why this elements are connected in mosfet driver circuit. Basically I want to know the use of this elements .
elements are
(1)R1,R2 and diode in parallel with them
(2)R3,R4
AI: The resistor is there to control the gate charge current and thro... |
H: Bootstrapping circuit in IR2101
Please explain how the bootstrapping circuit help in driving both the mosfets connected to IR2101 driver.Please explain this by taking an example of any voltage so that I can understand easily.Explain how the capacitor charging and discharging during this procedure and the use of di... |
H: How to make a current source that supply constant current independent of a voltage power supply?
I want to design the simplest possible circuit that drives an LED. The LED must load the same amount of current whatever the voltage is at the input, between 5 and 9 V. The current could be 10 mA. I assume that must be ... |
H: How to crimp JST VHR series?
I need to crimp the 18 awg wires into the 3-pin female JST VHR connector, but have no clue as to how to do it. How would the crimp latch onto the JST housing? Can somebody point me to any helpful resources?
Thanks!
AI: You already have an answer apparently pointing out the "proper" too... |
H: Gray code usage in modulation constellations
When mapping symbols of various modulation constellations, Gray code is used such that - each adjacent symbol only differs by one bit.
Why do we want small physical changes in the signal to correspond to small changes in the symbol ?
Why not use binary mapping ?
AI: Beca... |
H: Will the LD3985 will turn on in this circuit?
This is a beginner's question.
In the LD3985 datasheet I found this example:
I made this circuit:
If i put a capacitor between INH pin and GND, will it run correctly or should I remove this capacitor?
AI: The capacitor is between VCC and GND. INH is connected to VCC. ... |
H: How drift current is independent of bias voltage in semiconductors?
According to my textbook:
The drift current is relatively insensitive to the height of the potential barrier. The reason for this anomaly is the fact that the drift current s limited not by how fast the carriers are swept down the barrier but rath... |
H: Run Ltspice netlist using python
I would like to know please if there is a way I can run a LTspice simulation using only python.
In other words, I need a python alternative to this command: subprocess.run(['scad3.exe','-b','netlist.cir']). I know there is an ltspice library but, to my knowledge, it is only used to ... |
H: How to understand capacitor reading: 0.1uF + 2x2500pF?
I have an old electrical motor from the 1970s. It does not work as it should, and I suspect the capacitor attached to it. It has two legs and reads: 0.1uF+2x2500pF ~250v. I am not familiar with that "+2x2500pF" way of writing it. What should my multimeter read ... |
H: Trying to design a single op-amp oscillator
I am trying to build this single op-amp oscillator in Multisim but I keep getting this flat transient analysis. Is this what I am supposed to get? Am I using the wrong op-amp?
AI: It’s probably simulating the op-amp balanced on a knife-edge, a valid solution mathematicall... |
H: Need help designing a hairdryer
I'm designing a hairdryer as project for a university class, but I'm having trouble regarding the choice of the motor. I need it to have two possible speeds. My first idea was to use an AC motor and a diode as in the schematic below, when the current flows through the diode, half of ... |
H: Common emitter amplifier's \$R_C\$ breaks
What happens if the collector resistor breaks (its value goes to infinity) in a textbook example circuit?
I assume that \$ I_C \$ hits zero, \$ U_{CE} \$ decreases until the transistor goes into saturation, but still without collector current.
Does this affect the base curr... |
H: Buck converter input voltage lower than the designed output voltage
I have this buck converter which is designed to produce an output voltage of 9V for an input range of 18V-36V.
The datasheet of the buck converter mentions that the minimum required input voltage is 4.5V.
Assume my buck converter circuit & feedback... |
H: Control voltage to heat resistor using PID
I have a question about PIDs. I have a 2.2 kW heat resistor powered from 220 Vac. I would like to control the resistor using PID.
As I can see the most PID based control systems are using a Solid State Relay (SSR). Therefore, I conclude that these systems produce a smart o... |
H: Op amp circuit and input impedance
I am trying to understand this op-amp circuit that came from one of our suppliers. The input on X9 connector is a speed sensor (magnetic pickup sensor.) Its voltage amplitude is proportionnal to a motor speed (up to 7500 Hz.)
From what I understand, the op-amp IC11 plays the role ... |
H: Polarity tester for 1V to 60V circuit
I am making a circuit board to test the polarity of the batteries. The batteries will have different voltages from 1V to 60V. I want to detect the polarity with two LEDs. See below circuit diagram I drew. It works, but when nothing is connected still one LED turns on.
Solution... |
H: Adjustable CC/CV supply with voltage and current limiting having no output voltage at low voltage levels?
Im trying to create a power supply with an addjustable output between 0-12V or 0-3A (CV and CC adjustable). To make sure that the components don’t get damaged I'm trying to implement a protection for over curre... |
H: EMC filter in DC-DC converter cascade
I'm designing a power supply stage and I have the cascade of multiple DC-DC converters. Each DC-DC converter has an EMC filter.
The first DC-DC converter requires a capacitor between Vout and GND C1 = 2uF, and the second DC-DC converter requires C2 = 47uF between Vin and GND. S... |
H: First SMD Design Comments / Input before Manufacture
Just designed my first "real" PCB that I plan to send out for manufacture in the next day or so. I've milled out a few on a 3018 CNC. I wanted to do this one that way as well, but realized it would have been a bear to make DIY and mostly THT wasn't the directio... |
H: Longer time between BLE advertisements
Is it ok to increase the time between BLE advertisements to longer than 10.24 seconds? I know 10.24 s is the longest time I can set for the advertisements to automatically repeat, but I can also manually turn advertising on and off.
If I set a timer for 1 minute to enable adve... |
H: Is the voltage on the resistor always low when the zener diode is not in reverse operating region?
I´ve read that the zener diodes are used for voltage regulation, and the resistor in this circuit limits the current through the diode and drops the excess voltage when the diode is conducting.
Does that mean the vol... |
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