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H: Does volts or amps increase the strength of an electromagnet?
I'm trying to make an electromagnet that's strength is constantly getting incremented by small amounts every second. I need to know, which would have a greater effect on the electromagnet's strength, amps or volts? (I know increasing the turns and/or den... |
H: Amplify PWM Signal from exactly 0-3.3V to 0-5V
I am converting a chinese lasercutter to be controlled using a Smoothieboard. The PSU is controlled by a TTL High / Low to "arm" the laser as well as several safety measures.
When the laser is armed, the power is controlled by a PWM signal. This PWM signal from the Smo... |
H: Building a numeric potentiometer for AC current
I'm building a bench to calibrate a device that measures AC currents. As I won't build something accurate, the current will be measured with a current clamp and a multimeter (voltage mode).
For the current load, I first tried a diode bridge with big capacitors and af... |
H: DALI Signal Voltage Range and Power Supply connection confusion with WAGO
In an attempt to solve this problem, I was cross-checking my connections several times. During this, I thought it will be interesting to see the DALI signal coming out of WAGO DALI Module as opposed to the signal coming out of my board. I was... |
H: What do the inductors L2 and L3 do in the following rf power amplifier circuit?
I found a circuit online about an rf power amplifier working in the 88 to 108MHz FM spectrum. The circuit diagram is shown below
I understand that an amplifier needs an inductor and a capacitor in a resonant circuit to build the output... |
H: Is an all-pass filter a linear phase shift filter?
Im in need of an application that needs to add linear phase shift to a signal similary to the one produced by a Bessel Filter, meaning constant delay, my question is: does a standard 1st order all pass filter provide a linear phase shift? if not, what circuit provi... |
H: Connect to Xilinx Zynq 7030 via JTAG connection?
Imagine you are trying to write Bare Metal applications on a Xilinx Zynq 7030 board.
Since burning sd cards all the time gets tiresome, you want to establish a JTAG connection. You get a JTAG HS3 programming cable, set up your lovely ARM DS-5, write a nice test "Hell... |
H: Resistance in parallel with MOSFETs
Here I have a P-channel transistor (Q1) and two N-channel transistors (Q2 and Q3). I would like to know more about the resistors (R1 and R2) in parallel with these MOSFETs.
Are these resistors pull-up and pull-down resistors? Or do they have something to do with the value of the... |
H: Series RLC Max Voltage calculation Problem
I am confused on how to calculate frequency for VLmax and VCmax.
Is there a better way to find other than d(VC)/df = 0 and d(VL)/df = 0 ?
AI: I'd solve the transfer function H(s) with the capacitor across the output (as per a 2nd order low pass filter) then move on to sol... |
H: Bypass the open circuit
I have a circuit in which bulb is attached, I want to let arduino know if bulb is functional or fused. Obviously when bulb will be fused it will become open circuit. I am using mains AC to power the bulb and I want to make feedback signal to send to an arduino
My bulb is running on 220 V con... |
H: STM32F446 I2C peripheral won't assert repeated start condition
I am writing some register level firmware for my STM32F446 to use the I2C peripheral to talk to an accelerometer. The sequence of events i need to do is as follows
1) START
2) SLAVE ADDRESS+Write
3) SUBADDRESS (command byte to specify which register add... |
H: Component Symbol identification; Rectangle with large T-shape
I've been searching for days and still have not come up with an answer.
What is this symbol?:
The component in question was found on this mosfet amplifier schematic from the 1980s.
AI: This looks like preset potentiometer wired as rheostat.
Here you can... |
H: Short circuit = no power?
Now I want to build stuff and I'm really interested in learning things (consider I'm starting from scratch).
So I'm reading all of this website and the following line in this article got me scratching my head for some time:
[about the power rating of a circuit]
Likewise, if we have a ... |
H: "Perfect" transistor using an op-amp
The U1:A(+IP) represents my input (0 to 6V).
I am trying to power a lamp which requires at most 6V@100mA, the input will vary between 0 and 6V but it doesn't provide enough power for the lamp (the input comes from another op-amp used to convert current from 0 to -2mA to a volta... |
H: Stepper motor voltage / resistance per phase
I am trying to run this stepper motor (XY42STH34-0354A), but I am encountering two odd issues with its performance: slowing of the motor in 1/32 microstep mode, and a "soft cap" of the RPM where the speed of the motor barely changes despite increasing the RPM parameter.
... |
H: ESP8266 ESP-01 drive 6V led with GPIO with 2AA batteries as source
I have an ESP-01 with two AA Batteries directly connected as power source.
I have a button and led wired up to the GPIO. With a standard led it is bright enough when I add new batteries, but after time the led lights very low.
Now I want to connect ... |
H: S8050 datasheet typo?
I have some S8050 transistors and was looking for the stats of them in the datasheet. I found some strange values for the Ib/Ic relation:
Shouldn't the unit on the y-axis be A instead of mA? The datasheet of all S8050 subtypes have A on this axis. Ib 1.5 mA = Ic 0.25 mA would be a DC current ... |
H: 3 pole breaker and wire amp rating
In the main panel, there are 3 wires for 3 phase power going from 3 pole 40A breaker to a sub panel. the breaker is (CKIPSAL 4CB340/6 C40)
The wires are in 2 cables.
Each of these wires has 7 strands 19 SWG each. Online search reveals that 19 SWG handles 4.13amp. which tells me th... |
H: Thermocouple noise causing spurious reading with SSR
I have a thermocouple PID SSR heater as shown, based on the MAX31855 ( datasheet ). I get spurious readings when the arduino is plugged into my laptop, my laptop is plugged in to its charger, and the SSR is active.
I'm getting a lot of spurious readings coming f... |
H: Short circuit = zero voltage?
Reading this question and its answers (as well as other questions), it seems that in an idealized short-circuit with zero resistance, one concludes the voltage is zero.
This seems completely wrong.
The justification is given by V=IR. Assuming current is finite you would indeed conclude... |
H: 'Leftover' voltage when using constant current
I came across this circuit,
simulate this circuit – Schematic created using CircuitLab
Which states that the current through the LED is equal to 0.5*R2/1000. I'm not 100% sure how to come to that conclusion, but that is only a part of my question (a part that I am sti... |
H: Type-C Cable : Different between Active cable, Passive Cable, EMCA
Please anyone help me to clarify different btw Active cable, Passive cable, EMCA.
Their definition seem difficult to understand.
Additional, in USB-TypeC Specification from usb.org:
Active cable : An Electronically Marked Cable with additional elec... |
H: Voltage through resistor connected to tesla coil
I have been reading up about tesla coils and wondered what happens in a tesla coil circuit.
If I have a tesla coil producing around 40KV in close proximity (around 10mm spark gap) to a metal pin that is connected to a 1 ohm resistor and then ground, what value would... |
H: Voltage divider in voltage mode control of Buck converter
What is the need of voltage divider in buck converter?
I am not able to understand that why can't we connect output voltage as a feedback voltage to the error amplifier
AI: If the output voltage you want is equal to the reference voltage used by your buck c... |
H: Ethernet RMII on two layer PCB
INTRODUCTION: I'm aiming to design an Ethernet connected system as a hobby ( ie. plenty of time but not wishing to spend much ). My design constraints would ideally be sticking to a 2 layer 100mm x 100mm PCB with 0.3mm min holes and 0.15mm min track/clearance, up to 0.6mm thin total s... |
H: switch mode power supply diodes
Hello I have a question on switch mode power supply diodes.
Usually switch mode power supplies have a rectifying diode at the transformer output.
Do these diodes regulate the transformer output or do they just rectify the output?
For example a transformer with a 12 volt output ac wh... |
H: opamp voltage offset balance resistor for varying input Z
I'm using a non-inverting amplifier to amplify AC signal, datasheet of my opamp say this
balancing resistor be used to reduce the offset errors, balancing resistor equals the parallel combination of R IN
and R F
But my input terminal(+) has an impedanc... |
H: Floppy / Brushless DC motor speed regulation
I have a non working TEAC FD-235f 161-U, which is a rather rare (nowadays) 3-1/2" Amiga floppy drive.
A cap had leaked over the PCB and eaten away at the traces. I jumper wired the broken traces and replaced the cap with a through hole 4,7µF electrolytic cap.
https://img... |
H: Placement of ESD resistor
We have a circuit that has a 6V input for charging. We want to protect the device from ESD on the input, but have some discussion on where to place a resistor. The two differences we are looking at are below.
In the first case, we have the argument that the series resistor will slow the in... |
H: Extend linearity range of this opamp circuit
Sorry if my question is too naive, I'm new to this. I am trying to design a controlled current source for currents up to about 1A (diagram below). My requirement is that the current depend only on the value of a single voltage source and a single resistance (which I can ... |
H: Why do generators have to rotate at a slower frequency if demand outpaces the supply?
EU residents might have noticed that some of the clocks in their house have been running out of sync with other clocks. Apparently, the cause for this is that power suppliers had to reduce the frequency at which the AC network alt... |
H: When can free-floating electrical contacts become dangerous (e.g., start a fire)?
In general, when should free-floating electrical contacts be considered potentially dangerous? Danger may be direct (e.g., due to electrical shock) or indirect (e.g., due to fire risk).
In this question on SE.SuperUser, a poster asks... |
H: Question about digital modulation
So there are several ways to transmit a bitstream but where is the actual info when my carrier is a sinewave?
My basic understanding is we have symbols (phase,amplitude or frequency), we assign bits to these symbols and by modulating or changing those parameters (APSK,BPSK,FSK..) t... |
H: Typical wavelength range for solar cell measurement
Why is a wavelength range of 300nm-1100nm usually used to investigate the properties of solar cells (EQE, current generated, etc.)? Is it to reduce spectral impact? I also don't understand what is meant by spectral impact...
AI: Silicon's band gap is about 1.1 eV,... |
H: Impedance matching: L-network or micro strips?
I'm trying to embed a u-blox neo6m gps module to an stm32 controlled board. I'm planning to connect the module to an SMA connector and use a 50ohm antenna.
The datasheet of the neo6m states that the impedance of the connection between the module and the antenna must be... |
H: Should circuit breaker be installed before hand switch?
I am a student of mechanical engineering so I am not very familiar with electronics. Recently I started working on a project where I am researching a control system for a motor which does some work. The system is powered by 3 phase AC electricity + ground + ne... |
H: Voltage loss over wire
I need to run 12v across 30 feet of 18 guage wire. The device on the other end consumes 2 amps.
I have a 12v power supply (rated 3A) and I want to ensure the device on the other end gets the full 12v.
I found this post voltage loss calculation but I'm not clear on something. If my power sup... |
H: How do these buttons work?
I can see traces that connect the corners of where the button is mounted, but it seems to me then that the contacts should be always connected via the metal dome button. There's nothing in the middle on the PCB where the button makes contact whenever it's actuated. Could someone explain ... |
H: What is the difference between MCPWM and LEDC PWM?
The ESP32 microcontroller has MCPWM units (Motor Control PWM), used to control motors, and LED Control PWM. The ESP32 docs say the LEDC can be used to generate PWM for other purposes as well, and in fact I am using it to drive a servo. However, what makes it differ... |
H: Multiplexer not switching any audio input
I have designed this audio switch. 1 out of 4 TRRS inputs is selected.
I am testing it but it does nothing.
I press the switch to switch the next channel and nothing works.
The idea here is:
the 555 debounces the key and a pulse is injected on the flipflop when the button... |
H: looking for a device or tester to know if car is electrified
I'm new here and definitely not an electrical expert - so please forgive any lack of clarity and errors in my terminology or tags.
We live in a rural area and drive a plug-in hybrid electric vehicle which we love. However, recently an electrical-related p... |
H: What is this circular rod with wired wrapped 'coil' and ceramic capacitor?
Found this in a battery compartment, glued with white gum, however not connected to anything.
It is a ferrite circular rod of 3cm, diameter 6mm and wrapped with some wire (12/13 windings) and connected to a ceramic capacitor of unknown size... |
H: Kicad PCBnew: Cannot figure out why DRC reports unconnected pads
I'm very new to KiCad and PCB design in general (this is my first project). I have just about finished up my first PCB and upon running the DRC realized that two of the pads in my schematic were being reported as unconnected. Here is a screenshot of t... |
H: What is ΔICC term stands for in datasheet?
This is the datasheet of the MUX (74LVC1G157) I am working with. While I was doing the power calculation, came to the following parameter, ΔICC.
1) What is this additional supply current stands for?
2) What is the significance of this value?
AI: To avoid the "additional ... |
H: What is the total power consumption of a flipflop?
See the datasheet of D flip-flop (74V1G79).
Here the total power calculation is given as follows,
Average operating current = Switching current + Supply current.
But if there is a load in the output side of the FF, (Assume the case of ring counter with output side... |
H: Low cost power supply redundancy
I'm looking at coupling the output of two computer PSUs, driving a fairly stable high power project (around 300-400W peak) most likely using all output rails (12V, 5V, 3.3V) all well within the rated limits of a single PSU. Ignoring issues balancing load between rails on a single PS... |
H: Battery level on battery indicator drops when i connect a load?
I've got this cheap battery level indicator that has 4 battery level segments, it is connected to a 12V-18AH lead acid battery that I to charge my laptop and my 1W light bulb.
I really can't seem to understand the behavior of it, as soon as I plug the ... |
H: Right hand rule for clockwise and counter clockwise direction
If the conductor 'CD' rotates in clockwise direction in the figure, voltage will be induced on it. What will be the polarity of the voltage on terminal of the conductor 'CD' when the conductor rotates in clockwise direction according to the right hand r... |
H: Practical way to generate 1500V?
In designing the power supply for an radiation detector, I need to supply up to 1,500V at 2 mA from mains (170 Vdc).
I've largely considered a flyback converter, but cannot find a flyback transformer with a voltage gain of N=~16 (for a voltage gain of 8 at 50% duty cycle) rated for ... |
H: Shouldn't internal input resistance of a transistor be almost zero?
I am absolute beginner in electronics and the whole transistor thing is not looking very intuitive to me. Suppose this problem, in active region input terminal voltage almost remains constant with change in input current for a transistor. So, in te... |
H: Alternative to LM317
I am working on a battery charging circuit based on a solar panel and require a constant voltage supply of, let's say, 5.0 V to the battery. However that's not what one gets from the solar panel. This calls for the use of a voltage regulator.
The constraint here is that I shouldn't be wasting m... |
H: A question about impedance on a multiplexer
I have designed this audio multiplexer
This is a 4 input TRRS audio switcher. Remember TRRS (4 pins: mic, left, right and ground).
I press a button and I change the input that I want to send to the output.
This switch is supposedly to work as a "universal" switch for all... |
H: Proper Spectrum Analyzer settings to match sweep speed to pulsed signal interval
I was trying to measure received signal level of a pulsed signal (at 433MHz) sending packages of 64 bytes with an interval of 1s. As shown in the attachment, the settings of Spectrum Analyzer are RBW=100 kHz, VBW=300kHz, sweep time=2.5... |
H: Should the error term of PID be normalized?
By "normalized", I mean +/-1 ~= the maximum error the system can reasonably be expected to experience, or divided by the setpoint.
Background: I am working on a PID controller for an SSR heater which is very responsive (5°C/s up, 0.5-1°C/s cooldown). The setpoint is in t... |
H: How to use phasor algebra to solve for capacitive reactance?
I have an RLC series circuit.
Voltage supplied by volatage source as a function of time: \$V(t) = 230 \sin(\omega t+\pi/4)A\$.
Current in circuit as a function of time: \$I(t)=10\sin(\omega t - \pi/6)V\$
The value of the resistance is \$5\Omega\$ and val... |
H: How to create circuit for low voltage trigger of a relay
I have the relay in the picture above and have it powered with 5 volts.
My question is how do I wire up the trigger. Correct me if I'm wrong but I'm assuming that if I send 5v 2a to the trigger pin it will fry it. so how do I drop the multage and or amperag... |
H: Reading Specs on Motor Drivers
I am looking at a couple motor drivers for a robot I am working on, but I have run into the issue of not really understanding spec sheets and knowing what specs I need to look out for to make everything work. Some of these come up easily on google and others do not.
So what are the s... |
H: PIC16F84A wont run my program on a breadboard
I have written a program on the PIC16F84A and it seems to work perfectly on the PIC testing board. After i had created the program and assembled it onto the PIC, i placed it onto the breadboard and connected all of the inputs and outputs and power lines.
I am using a 2.... |
H: How does this radio transmitter circuit oscillate?
I am trying to understand how this circuit operates.
I understand how the circuit works on the right side of the transistor, but the oscillation stage with the crystal confuses me.
It appears that the crystal has no feedback from the output of the oscillator. I re... |
H: How do relpol RM84-2012-25 relays work?
Again, I am asking noob question because I have no background in electronics. In some installation that I am trying to understand there are those kind of relays, use as a logic for buttons (switches):
I read the manual of relpol, and although I know how relays generally work... |
H: Warming up metal plate safely
I want to design a riddle:
1. 12 metal plates on the wall
2. 8 plates at room temperature.
3. 4 plates at 40-45 Celcius(104-113 Fahrenheit), it is important the plate doesn't exceed the temperature limit for safety purpose.
4. players have to identify the 4 warmed plate by touching.
5.... |
H: Can no-connect pins on EEPROM ever be connected to VCC or GND?
I created a circuit in which all the address inputs of an AT28C256 are connected to outputs of shift registers (74HC164).
In the future I will do many of these circuits, however I haven't yet decided if I need the full 32KB of memory.
Let's just assume... |
H: Quadrature encoder - Most efficient software implementation
Simply put, I'm controlling a DC-motor with a dual-channel encoder with a microcontroller for a personal project, and I'm trying to find the "best" software-based implementation of the following state-machine given in this TI reference manual:
Before doin... |
H: 2xAA + 5V Boost Converter: Unexpectedly Low Current Output
I'm quite new to electronics, and decided to make a mobile powerbank for my Raspberry Pi Zero / Phone out of 2xAA Batteries and a 5V, 600mA boost converter with USB output. However, I'm getting an unexpectedly low output of only 0.08~0.10mA @ 4.5~5V when ch... |
H: Turn on MOSFet with Optotransistor
I am building a pcb where I will be switching a bunch of MOSFets which are optoisolated. My plan is to do this with optotransistors.
A typical circuit for a transistor controlled MOSFet, which I'm seeing online, is as follows:
simulate this circuit – Schematic created using Circu... |
H: What is the purpose of this FET load?
I'm used to seeing a load resistor in the place of the yellow highlighted (Q2) section of this FET amplifier circuit.
This is the input section of a guitar overdrive effect, so any distortion created is likely not a problem.
Is this an active load to increase gain or something ... |
H: Instrumentation amplifier noise amplified
I built a simple circuit with an instrumentation amplifier (PGA204AP) in order to clean a differential signal from noise. The signal is generated few meters away from the acquiring point and the cable (twisted pairs shielded) pass through a very noisy environment.
The circu... |
H: Electrostatic in an Arcade Machine (Arduino)
I set up an arcade machine, which consists of an Arduino, a coin validator, a 12 V adapter, and a PC. It works as expected, when I insert a coin, a signal is captured via Arduino. The output normally stays at 0 V, goes to 5 V when a coin is inserted for a brief period.
T... |
H: What is the point of two fuses in series?
I've got a 12V power adaptor (3.8A). And it got two fuses in it (T3.15AL250V, 3AL250V, one of which (3.15A) has blown, along with mosfet, current sense resistor, 450V cap, and IC. I replaced all failed parts, except the fuse (soldered jumper, since I don't have 3.15A fuse f... |
H: backtick in verilog numeric constant
So I was writing some verilog in quartus and wondering why the heck it was misbehaving.
I eventually discovered the problem was some constants where I had inadvertantly used a backtick instead of a single quote. For example I had 32`hdeadbeef instead of 32'hdeadbeef.
What I fin... |
H: Unstable 11-13.8 volts to 12v regulator. DC-DC buck or Zener diode, how to do it better?
I have 12v power source Mean well PSC-60A with UPS function and acid buttery.
In datasheet says, that output can be regulated from 12-15V - but it's not true, because tested results for output was:
from 11v(when not connected... |
H: How Do They Make Surface Mount Capacitors and Resistors?
With the ever decreasing size of surface mount resistors and capacitors, how do they make such small components?
AI: There isn't a lot of written material on the net about discrete component manufacturing. If a picture is worth a thousand words, is a video i... |
H: How does an IIR filter change depending on the approximation used?
What are the main differences between the filters when using Butterworth, Chebyshev type I, Chebyshev type II or Elliptic aproximations.
AI: A simple Wikipedia tour (B,CH,E) will tell you everything, but fear not, I can copy and paste some informati... |
H: Am I using AC relays correctly?
My original question was put on hold because a number of people found it confusing. Drew figured it out, however, and set me down the right path with relays (not diodes). There is still one issue outstanding, so I'm updating my question based on my newfound understanding of relays.
T... |
H: How does one calculate the resistor in parallel with the MOSFETs?
I would like to know more about the resistors again in parallel with the MOSFETs in the picture. The Si2365EDS is a P-channel transistor and the 2N7002 is a N-channel transistor. How does one calculate the resistor in parallel with them? How does on... |
H: VHDL: Simple UART TX not working
As a first step towards learning VHDL and using FPGAs, I want to implement a simple UART transmitter which only transmits a constant bit-sequence according to the UART protocol with 9600 8N1 configuration.
I'm using a Altera Cyclone II EP2C5T144C8N board which has a 50MHz clock.
Th... |
H: Output impedance of circuit with ideal op amp
I have the following circuit which I'm asked to calculate the output impedance Zout, assuming the op-amp is ideal.
I use the following equivalent circuit:
simulate this circuit – Schematic created using CircuitLab
I get:
$$i_1 = \frac{V_x}{R_{i}+R_1}$$
$$V_i = -\frac{... |
H: One pulse to ON/OFF bistable latching relay
I've been trying to design a latching relay driver circuit, with using a push-button switch. Basically when the circuit is powered on, first press in push-button switch make the relay SET, then the second press will make the relay RESET state.
I've searched online and fin... |
H: Trigger a circuit with square wave
I have a circuit that develops an 800Hz square wave of 5 volts and about 200mA (it's a buzzer oscillator) when energized, I want to detect this square wave and turn on another 5v circuit with a separate power source (an audio playback IC) when the square wave is present, and then ... |
H: \$ Z_{out} \$ of VCCS ;confusion
How can we evaluate the approximate output impedance of the VCCS (Voltage controlled current source) based circuit at port \$ V_0 \$ ?
My Approach:
To calculate \$ Z_{out} \$,equivalent circuit will be :
Applying KCL at \$ V_0 \$ ,we get:
$$\huge I_t + g_m v_{R_{in}}= \frac{V_... |
H: Transistor to turn 3 Amp motor on/off
I have 3Amp (max) 12v DC brushed motor and power supply. I'm thinking of turning this motor on/off and (maybe) control its speed with a transistor. I'm not an expert in electronics at all (I'm a programmer).
Another variant is using relay, but I see transistor as a better solu... |
H: Wave from the piezoelectric material is not what I expected. Did I miss a step?
The wave from the piezoelectric material may be
sine wave (classmate told me )
AC wave (but not sine, I suppose it from the paper)
DC wave (from the oscilloscope it seems like a DC wave, not AC wave)
Steps:
Red oscilloscope line con... |
H: 10k Resistor Pull Up/Down Standard for 74 series chips
I've been having some issues lately with the usage of 10k ohm resistors as pull down resistors for 74ls series chips. Most people seem to choose 10k resistors as their default pull up/down value but I've found that the pins seem to float a little anyway when tr... |
H: Can't run code in Keil for STM32L433RCT6P on NUCLEO-L433RC-P
Recently at Embedded World 2018 in Nuremberg I got, for free, NUCLEO-L433RC-P with STM32L433RCT6P chip onboard. I want to broaden my knowledge in STM32 chips. Before, I did simple stuf on STM32F4.
All the jumpers on the board are placed correctly.
I ope... |
H: 3 watt LED driver
is this schematic good for driving a 3 W LED (700 mA, 3.3 V)?
P1 is a 12V lead-acid battery input, P2 output.
AI: Is the schematic good?
No, it's not a good schematic.
Criteria for good schematics are, among many others:
sufficient spacing to make them easily readable
Improved readability by co... |
H: Design a filter that allows frequencies below 5 kHz to pass freely, but all frequencies above 5.2 kHz must be undetectable
My biggest challenge with this question is its ridiculously steep roll-off rate.
I am assuming that the signal is undetectable if its gain is -20 dB. This means that, within the transition band... |
H: help identifying TVS diode
My Precor M9.23 treadmill stopped working, and after reading the troubleshooting manual and looking at the motor control board, the led indicated that the board is bad. Upon removal of the board, I saw that one of the diodes had failed (blown open). I can't see any indications on the di... |
H: Short sound when toggling a light indicator
What is that “click” sound we hear when a light indicator turns on or off on some very simple devices, like the lights that tell us when some flatirons or ovens are heating up?
I can’t open the circuitry of my oven just to find out what controls the light. What electric o... |
H: Should the primary winding of a transformer have more or less resistance to increase efficiency?
I'm a bit unclear about how to think of the energy transfer in a transformer and how it would be optimized. On the one hand, if the primary winding of a transformer is more resistive than the rest of the equivalent cir... |
H: approximately how long will it take for 171v to drop to 100v with a 75w light bulb?
I'm not an electrical engineer, but I do have a question regarding voltage and timing.
Approximately how long will it take for 171v to drop to 100v with a 75w light bulb?
Im only looking to figure out how long it would take to disch... |
H: Understanding Minimum Output Voltage of Cascode Current Mirror
I guess that I have some serious trouble understanding how to get the saturation equation for the cascode current mirror right which is known from all the textbooks as
$$
V_{out} = 2 V_{DS, sat} + V_{th}
$$
It's quite intuitive to get to the point that... |
H: E.V. Motor Driver (DC). How to protect parallel MOSFETs and the driver?
Overview:
I have an electric quad that I have heavily modified. The motor will need to be replaced every now and then because I am driving a 48 volt motor with a 72 volt supply that can give extremely high currents (6 12V motorcycle batteries) ... |
H: AMI 7838? (identify this part)
Help appreciated identifying part and finding datasheet.
Top reads:
AMI 7838
S2114L2CC (might be a 5 not an S)
Bottom reads:
7835A1
1560
KOREA
18 pin ceramic DIP, gold plated? pins
AI: As Janka said in comments, this is a 2114 SRAM (more specifically, 2114L low-power version). The clu... |
H: Op amp integrator output has DC offset even when a coupling capacitor is used
Please help me understand why this op amp integrator output has a DC offset. Why doesn't the coupling capacitor block it?
EDIT: Running the simulation for longer time resulted in the expected output behavior
AI: A couple things to kee... |
H: Mosfet part number? How to find a replacement otherwise?
I did a quick google search based on the numbers on this Mosfet and found nothing. How would you go about finding a datasheet and replacing a part like this?
GP7NabOHDa
CCos1
MRC - 502
This part is located on an Ametek 1000W blower. I believe it... |
H: Do 1/8W resistor and tantalum capacitor consume less electricity?
I used 1/4W resistors and electrolytic capacitor to combine a circuit originally,and found that the output voltage is less 2V,this is not my expectation ,so i replace them with 1/8W resistors and tantalum capacitor ,and the voltage become from 2V to ... |
H: difference between max3387ecug+ and max3387ecug+t
can I know what the difference is between MAX3387ECUG+ and MAX3387ECUG+T, the MAXIM datasheet doesn't seem to point the difference.
AI: T, T&R, T10 | Part is furnished on tape-and-reel. T or T&R indicates the standard reel quantity for the given package, usually 2.5... |
H: Can a capacitor be used as a dipole antenna?
Can a parallel plate/cylindrical/spherical capacitor be used as a dipole antenna? Isn't a dipole antenna like a capacitor with a small capacitance?
AI: The search-term you want is: "patch antenna."
Yes, parallel-plate capacitors are dipole antennas (especially true at s... |
H: Analog Mux as Cheap I2C Mux?
Just looking to have two devices on a single bus with the same address. There are many I2C multiplexers available, but they seem to cost ~4x what a 2x 2:1 analog multiplexer costs.
Any reason I can't use an analog multiplexer for I2C running a 100kHz bus?
For example a TI TS3A5223RSWR i... |
H: Simplest way to get regulated 12V from 10-18V input
Getting a regulated 12V DC supply can be extremely simple with something like a LM7812. However, I am trying to get a regulated 12V output with a supply that can range from 10V to 18V. My thought is to regulate down to 9V and then back up using a step-up regulator... |
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