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H: Idea behind current mode control in DC-DC converter
I am learning about control strategies for DC-DC converters.
While I find voltage mode control easy to understand, I struggle to understand
current mode control.
Is the idea here to control the output voltage by controlling the inductor current?
If so, what is th... |
H: Power amplifier SST12LP14-QVCE
I was reading about this IC and its applications I looked in the schematic I understood what the pins are except for 2 pins, the detection pins. What are they and what they connect to?
I'm not that great in these things but trying to improve. Thanks in advance.
AI: Those pins are for ... |
H: What happens if the Input voltage and the output voltage are same in a boost converter?
I'd just like to know what would happen if the Input voltage and the output voltage are same in a boost converter. I have a feel that it might not work.
But would like to understand the effects that will happen on the inductor a... |
H: Overvoltage protection circuit transistor draws 2x load current then suddenly stablizes
I've built an over voltage protection circuit according to this schematic by Maxim:
If the load is low power consumption like MCU or other ICs, it works just fine.
If the load is higher for example, 350mA (maybe DCDC circuit,) ... |
H: Why am I getting different simulation results in KiCad every time I run the program?
I feel like there is something wrong with my circuit. I'm trying to do an AC sweep simulation to find the transfer function frequency response from input to output.
AI: I think you do indeed have an error in your circuit:
You hav... |
H: Is it possible to stabilize every system with an integrator
I was wondering if it was possible to stabilize every system with an integrator. From my point of view, an integrator can be used for applying a dominant pole strategy.
If I place the pole at very low frequency, the phase shift will be 90°C for the low fre... |
H: How to convert encrypted PSpice model into LTspice model?
I want to simulate the model in this link: https://www.diodes.com/part/view/AL8860Q/#tab-details under the header of the Technical documents and Spice Model on the right-hand side. The problem is that it is encrypted for PSpice simulation. I was wondering if... |
H: RF choke DC block cancels my small signal totally in LTspice
I am building a common source amplifier as shown below.
As you can see below, the Vsource signal is good sine, but after the capacitor the sine is totally canceled and I get only the DC bias.
I am supposed to see the sine with a DC offset after the C2 cap... |
H: Utility of a load resistance for measuring another resistance
In this paper they need to measure the value of an unknown resistance RS, whose value is the output signal of a sensor. However, instead of measuring this resistance directly with a multimeter, they place a load resistance RL in series with it, connect t... |
H: Why does my oscilloscope display a lot of noise at high sample rates / time windows < 25 us?
I have a Tektronix TDS640a scope that overall works very well for its age. I also have OEM 500 MHz probes, P6139B. When sampling at or above 25 us, my waveforms look "normal": nice flat signals, with maybe 1 or 2 pixels of ... |
H: Replacement fuse specification
I have a lighting fixture with a blown fuse on the PSU PCB. The blown fuse fitted was a "T3.15AL250C" 932 (red-coloured) box fuse. I replaced it with a "T3.15A 250V CQ MST" of the same form factor (but black.) The fuse blows instantly.
Before I start investigating if there's a fault ... |
H: Inverting op-amp unexpected voltage shift
I'm trying to create an op-amp circuit that attenuates a 5 V input signal down to a 1 VRMS Vout signal (1.414 V Vout).
I need to shift the output signal by 2.5 V so that it can be fed into a unipolar ADC.
Below is my current inverting op-amp circuit in Multisim:
As can be ... |
H: Tracing to see if IC is TM1650 or something else
I am tying to determine where the PCB traces are going in order to figure out if this is using the TM1650 or something else. Most of these (this is from a pool pump) uses the TM1650 but there are some that use some other chip.
From what I can gather, since the chip i... |
H: How can I clip a voltage upper limit in an analog signal?
This is a theoretical question since I've come across this type of problem many times.
Suppose an amplifier is powered between 12 V and -12 V, so the signal output can reach a maximum of 12V. If I am not expecting my signal to be more than a few hundred mill... |
H: Is a fast op-amp more difficult to stabilize than a slow one?
Suppose I want to make a simple non-inverting amplifier with a bandwidth sufficiently low.
Is it harder to make a stable non-inverting amplifier with a fast op-amp? When I read some documentation on the internet it seems that very fast op-amps like the O... |
H: How to estimate electrolytic capacitance from foil area
I opened a failed 1000 μF electrolytic capacitor. It contains 2 foils coiled with paper and some wet dielectric.
With reasonable assumptions (to me), I can not derive marked capitance from this formula:
$$C =\varepsilon _o \varepsilon _d \frac{A} {d}, \mathrm{... |
H: Some problems about the BJT in the resonant Royer (or Baxandall) circuit
This question is a continuation of my previous post about the resonant Royer (or Baxandall) circuit. I have built a prototype to verify the circuit.
The parameters are as follows:
The parameters of the transformer are as follows:
Except for... |
H: What kind of PSU is this?
I collect PSUs. But one is different compared to all others.
It doesn't have an output voltage written on it. When I measure the output it's 0V DC and also 0V AC. Also I didn't find anything about the output voltage in the data sheet.
So what kind of PSU is this?
(The word "Eingang" on the... |
H: Equivalent circuit problem
I need to find the values E1,E2,R1,R2,R3 such that circuit (b) becomes equivalent to circuit (a) according to nodes a,b,c.
Using the superposition theorem I found that the potential difference between the nodes a and b is 5V. Thus, E1=95V and E2=90V.
What should I do to find the resistor ... |
H: Minimum and maximum input voltage for boost converter for reliable operation
I'd like to know the minimum and maximum input voltage for a MCP16251/2 boost converter for reliable operation.
Can someone tell me the input voltage range for this boost converter for reliable operation?
AI: From what I understand from th... |
H: Do multiple USB 1.1 devices on a bus require a hub?
Can I simply attach multiple USB1.1 slave devices to a bus like I can with I2C (config A), or does the spec require a USB hub IC (config B)? Power in this application will come from a separate bus.
AI: Can I simply attach multiple USB1.1 slave devices to a bus lik... |
H: Instant flux density calculation of flyback transformer with airgap
How to calculate the instant flux density of a flyback transformer with airgap? I am trying to understand airgap is enough or not? Does the instant flux density reach saturation value or not? Also, how to calculate \$N_{primary}\$ of the transforme... |
H: Clock Fanout Buffer Circuit
I need a clock fanout buffer to drive 3 components with same clock, and I have found this reference design but could not understand the reason of using the inverter in the middle.
Can I directly connect the tcxo clock to fanout buffer?
AI: The square wave generator is running of 1.8V whi... |
H: Does USB3.0 support reverse polarity in SSTX and SSRX?
Is it possible to Sawp the +/- pins of SSRX and SSTX to make the routing easier and avoid using vias? Does USB3.0 support this reverse polarity?
AI: According to section 6.4.2 of the USB 3.x specification, the superspeed lanes support automatic "Lane Polarity I... |
H: Pin header connector
In my project I make use of 3 PWM I²C-boards, each having 3 x 16 pin connectors. My initial thought was to use jumper connectors to connect LEDs to the pins but they are not reliable enough.
I would rather not de-solder 144 (3x16x3) pins, Is there a connector that can securely connect to these ... |
H: SD card does not responds to CMD8 command
I'm trying to communicate with SD card. However I'm stuck on CMD8 - when I send CMD0 (400000000095) I got 0x01 after one cycle. When I send CMD8 (48000001aa87) I got nothing (everything I read is 0xFF).
My process of initialization is as follows:
Set speed of bus to 100 kH... |
H: Li-ion battery voltage monitoring
tl;dr How to pick resistor (or component) values to alter the triggering voltage level for the second circuit?
Hello everyone. I have First Person View (FPV) goggles whose battery I lost. But since I have a spare 3S battery I was intending on using a buck converter to step it down ... |
H: How is it possible that HDDs are mechanically so robust?
Hard disk drives (HDDs) rely on a small read-write-head which hover about 70 nm over the platter 1, 2. The physical effect on which this hovering is based seems to be the ground effect 3, so it seems as if there is no electronic closed-loop control involved ... |
H: What do the waveforms in a buck converter look like just after turn on?
Below is the circuit diagram of buck converter.
I am studying about the buck converter. What I observed is everywhere it is explained with the help of waveform in steady state.
I have a couple of questions:
What is stopping the capacitor from... |
H: Question on LED current and voltage
This is regarding this battery charger IC.
In the below image, the output low voltage on the STATx pin is given as 1V, but that is for 4mA of sink current. That translates to around 0.25ohm of internal resistance/impedance.
If the LED's forward current (LEDs connected to the ST... |
H: A circuit which charges and uses a lithium ion battery
I am designing a circuit which will utilise a lithium ion battery. The circuit would ideally be plugged into a power source the majority of the time, butI would also like it to be portable. I have been doing some research into battery charging and management IC... |
H: Can IR Sensor TCRT1000 and TCRT5000 operate at 12V?
I asked chat GPT, and it said TCRT1000 and TCRT5000 are not suited for ops above 5V. But interestingly I have read a research paper where TCRT1000 has been used at 9V. I would like help decoding these datasheets and understanding whether its safe to use these sens... |
H: How could I validate my battery management schematic?
I drew a battery management system schematic based on this reference project found from a youtube tutorial
The reference schematic is this:
I tried to draw my own schematic and I have changed the original Q3, Q4, Q6, and Q7 MOSFETs 2SK3919 for the PSMN6R5-25YLC... |
H: Does it make sense to connect the MAX6675 to a Analog Plane?
I'm currently designing a PCB with 4 Layers. The stack up is as follows:
Signal - DGND Plane - AGND Plane - Signal.
There are a ton of components connected to the DGND Plane, and I know that for using the MAX6675 the slightest interference can cause ver... |
H: Heater (resistor) combination to achieve specific power
I am designing a heating circuit composed of ceramic heating resistors.
I have a 24 V supply and I am limited to 3 A, which allows me to disipate total of 70W, which is my target.
I have a limited selection of heating resistors in my disposal:
3V rated resisto... |
H: ATmega328P 4-button turn on, auto power off using transistor
I'm trying to create a basic 4-button battery powered remote. The logic behind it is that when one of the buttons is pushed it pulls the base of the PNP low thus turning on power to the circuit. The Arduino then takes over holding the base/gate down using... |
H: Trying to make a HASEL actuator
I was told that if I apply high voltage to a zip lock bag filled with baby oil with tin foil paper on the end it'd make it contract and act as a HASEL actuator.
I'm afraid of measuring the exact voltage if the device because I don't want to break my voltmeter but I read it's atleast ... |
H: Is there any chance to configure DDR3L SDRAM on Digilent Arty A7 FPGA development board to Dual Channel memory?
There are 256MB DDR3L SDRAM installed on Digilent Arty A7 FPGA development board. Dual Channel memory is popular nowadays in a PC. So I was wondering if there is any chance to configure the DDR3L SDRAM on... |
H: Transistor as switch that can handle a high base current
Which cheap, simple transistor can handle a high base current and doesn't need a base resistor to use it as switch?
AI: Note that - as a precondition for switching applications (saturation) - the potential at the collector must be smaller than the base potent... |
H: Interaction between PCB surface finish (ENIG vs HASL), wave soldering, and manual final assembly
I am developing a PCBA that is (for me, an amateur) fairly complicated: 4 layers, double-sided, mixed SMT/THT assembly. It is a fairly dense layout with ~150 total components including all the passives on a 100x55mm boa... |
H: Do I need to use a voltage regulator or an overpower protection
I am designing a circuit that will run on 5 V. The input however may vary from 5-12 V. Should I use a voltage regulator or an overpower protection circuit. I have found the 7805 voltage regulator but the input voltage is between 6-30 V. I understand th... |
H: Help with understanding why my instr. amplifier doesn't return anything
I have a pressure sensor (output -> Wheatstone bridge) connected to an amplification stage, as shown here:
As you can see, four points in total are attached to the ADC of my MCU (STM32L476ZGT3.) The reason for that is to check the noise at dif... |
H: Control a large number of LEDs from minimal output pins
I am working on a project that uses an Attiny84 to control a large number of LEDs. The number of LEDs far outnumbers the number of I/O pins. What concepts and principles should I be researching into for a solution?
AI: In general, your MCU will communicate ser... |
H: Latching push switch without a programmable IC
Is it possible to make a push switch latching without using a programmable IC?
I have a circuit with a 555 chip creating a square wave. I would like to add a push switch which when pressed once will turn the circuit on, then when pressed again will turn the circuit off... |
H: Should op amp reference terminal be connected to ground?
I would like to amplify the voltage from my thermocouple and had a couple of INA122s on hand. This is from the datasheet.
Should pin 5 be connected to GND? (pin 4)
AI: That an instrumentation amp (in-amp) not an op-amp. Pin 5, the output reference terminal (R... |
H: Is there any way to easily gain access to "actual ground" in an IT grounding system?
As the title asks, is that possible? By "easy access" I mean through some connection I can find inside my home, rather than burying my own grounding electrode and running wires from it to access. And by "actual ground" I mean the s... |
H: Where to connect two GND layers together?
I have a 4 layer PCB. The stackup is as follows:
SIG + PWR | GND | GND | SIG + PWR
Now I want to connect both GND planes with each other. EasyEDA Pro has this feature called "suture vias". If I add these vias get created. The picture with the newly created vias is below (... |
H: Debugging a problematic old TTL pull-up that's not pulling up
I am trying to bring back into operation a late-70s disk controller board (all 74xx TTL). I'm stuck trying to figure out why a small pull-up network is resulting in a far out of spec voltage not doing what (I believe) it's supposed to be.
There is a sect... |
H: ESP32-WROOM-32D need to press reboot to start working
I have made a PCB based on the ESP32-WROOM-32D, and the code upload correctly, but it seems that the board for start to work it has to press the reboot button first.
Based on the schematic that ESPRESSIF give us for the ESP32-DevKitC V4. One of the difference be... |
H: What is the structure and type of harmonics generated by a very differentiated square wave (i.e bipolar spikes)?
this question is in two parts.
Firstly, can you please tell me what the structure and amplitude distribution is of harmonics generated by a differentiated square wave of 50% duty cycle, where the time co... |
H: What type of connector is on this small Li-ion pouch battery?
I have some small Li-ion pouch batteries and I am having a hard time identifying the connector. To me it does not seem to be of a standard "JST" variety but I am not an expert. Has anyone seen such a connector used for a mass-produced Li-ion pouch batt... |
H: IP address detection tool
I need some help with a mini project of mine considering checking ip addresses. The main goal is to be able to either plug a device in between the router and the end device (a PC for example) in order to simply display the address assigned by the router to this specific ethernet cable. Alt... |
H: Would I typically get a shock from touching two live wires separated by ~240 V with each hand if my skin were completely dry (assume I'm ungrounded)?
As the question asks, would I? I'm aware that one should naturally never actually try this, and that people for the most part do get shocked when accidentally doing t... |
H: Logic-level, high-side, P-channel MOSFET switch
I want to use a MOSFET for high-side switching of the DRV425 fluxgate as it has no enable pin, and has quite a high power consumption (150 mW @ 5V -> 30 mA):
Before the P-channel MOSFET WTM2301 there will be a signal inverter SN74LVC2G04 for reasons not important for... |
H: How to set system bandwidth?
I would like to know how to set minimum system bandwidth according to the following requirement :
I have a system regulating an output. In nominal operation, the system has to regulate its output to \$S_{out1}\$. Then when an event occurs, the system change its reference (input) in ord... |
H: Need theoretical understanding of basis of IR sensor design
Below is a cutout of the IR sensor part from a heart rate sensor schematic. I need to understand how this part has been designed, what is the basis of the choice of the two resistor values R1 and R2, and the preset R8. The part shown here is a TCRT5000 sen... |
H: Why is the bitrate of infrared smaller than the bitrate of WiFi?
Infrared has a frequency of 300 GHz – 430 THz, while WiFi has a frequency of 2.4 GHz or 5 GHz.
As the frequency of infrared is greater than the frequency of WiFi, the transfer rate (bitrate) of IR should be greater than WiFi.
In reality, IR transmissi... |
H: AC step down circuit
I have a quick question about a circuit I want to build, namely a low voltage AC power source.
I attached a picture of the schematic.
Are there any safety concerns that I might have to pay attention to that are not addressed in the schematic? It is a pretty simple circuit, but it is my first ti... |
H: is it true that when I have a 7Ah battery w/ a C Rating of 10, 7 * 0.10 = 0.7A?
I have a SLA battery:
12v
7Ah
C Rating 10
Is it true to say that when I use a charger, the charger needs to be less than half of 7Ah * 0.10?
My charger is rated for 750mA for 12v batteries.
So, I have 0.75A at 12v for charging. That is... |
H: Regulated power supply design
Currently I'm working on my first electrical project - A dual voltage power supply. I'm very new to electrical design and have no prior knowledge of it. But I do learn fast so please bear with me. I was designing a power supply using an LM317/337 current boosted circuit, but I've been ... |
H: Charge time capacitor in a BJT collector with a parallel resistor
Hello, Given that circuit that has a constant current(let's say 3mA), How do I determine the charge time of that capacitor? since in t=0 the capacitor would have all the current but later it will split, so I can't use the usual formula(Vc=Vi(1-e....... |
H: Comparing liquid "energy" to batteries
I'm not sure how to convert or correctly compare gasoline/alcohol to batteries in terms of weight and volume. For example in the following link Specific Energy and Energy Density of Fuels I can find the following information:
Specific Energy
$$E_{8} = \frac{E}{m}$$
Energy Den... |
H: How to use thevenin theorem in this example?
Use thevenin theorem to find the current through 2 ohm resistor also find thevenin voltage and thevenin resistence.
My approach:First I open circuited the resistance through 2 ohm resistor then used voltage division to find the thevenin voltage but got the wrong answer.... |
H: My headphones have 4 wires instead of just 3
I cut into my headphone cable to repair the headphone plug and instead of the standard "3 wires" I read about all the time mine has four:
1 red (I assume right)
1 blue (I assume left)
1 white (???)
1 black (???)
These headphones don't have a microphone, so it's not for... |
H: What usb-class for a device intended to be as future proof as possible?
I am writing specifications for a product and need help to minimize its future need of maintenance.
In order to be able to be (optionally) monitored from the Internet the device is supposed to have a USB CDC port to connect it to a computer (I ... |
H: Does an AC rated fuse blow at the same current DC
Bought some 30A fast acting glass fuses. Thought they were rated 32VDC but I noticed when they got here they are rated for 32VAC. So would they still blow at 30A of DC current or would they allow greater than 30A?
AI: First of all, the voltage rating of the fuse is ... |
H: what is d-sub connector metal shield made of?
I want to solder a ground wire to the d-sub connector's metal shield( the bright color metal part of the connector), using tin-lead solder 60-40. I just wonder what kind of metal it is. I searched the web and couldn't find the answer.
This kind of connectors
AI: Finding... |
H: How to measure Stepper motor current when using EasyDriver A3967?
We are using EasyDriver stepper motor driver A3967 for running a stepper motor. We wanted to measure the current consumed by the motor using an oscilloscope. Can you give us some suggestions on how can we do that? I read about measuring the voltage a... |
H: Optocoupler transfer ratio
Every optocoupler has min and max current transfer ratio. I have read articles that said always design the circuit using the minimum current transfer ratio. However, I want to understand which parameter affect the transfer ratio. I did look at a datasheet of an optocoupler but couldn't fi... |
H: Putting an ESP8266 to sleep via either of two signals
I've got a circuit which I'm hoping to use to shut down my ESP, except where an interrupt happens from an external chip (MCP23008 GPIO expander), or I have chosen to manually keep myself enabled.
Being a bit cheap, I wanted to do this using diodes - D1 is being... |
H: Is it safe to sleep in the same room with a car battery?
I sleep in the same room with 2 car batteries. I'm not a battery person so I don't know what type they are. I tried looking for voltage but didn't find it printed on the battery. They're standard acid batteries, I use them to power LED lights and charge a pho... |
H: Should power supply be fused on input and outputs?
I'm building an automation control panel. It uses a 120VAC to 24VDC power supply to power several IO cards and signal lines. The entire system will draw less than 500mA when in operation.
This PSU is rated to output 24VDC at up to 5A. The sticker also states tha... |
H: Method for having long task delays in freertos
I was wondering how I can delay for longer periods of time using freertos function vTaskDelay(). Because the largest number you can store in a 16bit unsigned integer is 65535, the longest I can delay for is a little under 2 hours. I have currently implemented a metho... |
H: Should neutrals be tied together or left separate?
I'm working on a control panel. The panel is powered by 120VAC single phase (USA). The panel has a battery backup unit (UPS) which powers the panel if the incoming power goes out, and which filters the incoming power. The incoming single-phase power is connected ... |
H: Output Voltage of OP Amp is not equals to Acl x Vin in LTSpice
I have recently downloaded LTspice and when I am testing the LF351 and LM741 OP-Amp, I realised that the output voltage does not equal to the gain which should be -50. I have looked at the data sheet and the Vsat of the LF351 is around 13.5V and the LM7... |
H: how to solder rotary pot
Dear all, I was designing a PCB which contains a pot like the one in the picture. I know how to connect the three pins in the left. However, can anyone tell me what are the rest two pins (the small plate in the front and back) used for and how to connect them? Shall I connect them to groun... |
H: Transistor buck converter system current increase
I am putting together a small system to control an externally powered circuit from my RPi to drive a LED.
The circuit can be separated into 2 parts:
One side is used to power the Pi. I go from the battery (12V, 6A) to a buck converter that I use to drop the volta... |
H: How Do I Wire Battery?
I’m working on a little project of building a wireless speaker box, I’m getting some help from my dad as he used to build and sell speakers for DJ’s as a hobby so that side is all sorted but what I’m having a bit of worry with is the correct way to wire the battery.
I would need the battery t... |
H: Can I exchange data from a smartphone and in parallel quick charge it with an ic?
I am trying to exchange data between a smartphone and an microcontroller, also in parallel i would like to quick charge the smartphone with a commercial ic. The usb protocol is 2.0. Can i exchange data simultaneously with the quick ch... |
H: The polarity of the contacts when wiring an EMR
When reading Omron's datasheet of G6E, I find the words as below:
I can't understand well the words
"The difference in polarity applied to the contacts will affect the
endurance of the Relay due to the amount of contact movement".
So, why? And I only see this in... |
H: How to determine electrical energy consumed by knowing the current of motor?
I have an AC motor. It is running for 1 hours and I read the current every one minute and it reads 2A.
So how to know how much the energy my motor already consumed? In this case, voltage is steady at 220V and not knowing the power factor(... |
H: Build a voltage-controlled voltage source out of discrete components
I'm in a bit of a pickle. I need to build a voltage-controlled voltage source, but I don't have any opamps (or time to order them). I have been working for several hours trying to simulate a circuit in LTSpice that will do the job, with no luck. (... |
H: What type of high temperature crimp connector is this?
A heating element on a 3D Printer has coated stainless steel leads that were crimped to another wire. I cut the other wire but would now like to reconnect it.
I'd like to use the same type of crimp connector if possible - but have no idea what this connector i... |
H: Finding bits from audio file?
I am assigned to do lab that is allowed to ask other people for hint.
I am given an uncompressed PCM WAV file that has signal like following image:
And this is question:
determine the sequence of bits that were transmitted. Hint: the remote control transmitter contains a sticker insi... |
H: Why choose an 8bit over a 32bit MCU
With the recent Cortex-M rage, there seems to be a lot of 8bit bashing going around.
I was wondering what specific use cases engineers encountered where 8bit MCUs were the preferred choice over 32bit, and what decisions informed their choice.
I think this information proves use... |
H: What type of transformer do I need for a 5Hz AC source?
On the primary side, I have a low-impedance AC supply that can be adjusted to a minimum of 100V, with a frequency variable from 5 to 800Hz (and I need to operate over this whole range). I need to somehow transform this down to 2.5V or lower, naturally as effic... |
H: Odd resistor design
In one of my designs, I specified the Rohm LTR10EZPF1003 100K 0802-Wide resistor:
The issue is that when I added the resistor to the circuit, it creates a direct short:
Measuring between the Green points is "No Connection" (expected 100K)
Measuring between the Blue points is a short (expected... |
H: Finding an accelerometer
How do I go about finding/calculating the specifications of an accelerometer that can measure vibrations upto 2kHz and deflections upto 2mm?
EDIT: After calculating and obtaining 16000g's worth of acceleration, I consulted my mentor and it seems like we might not experience 2mm of deflectio... |
H: Does the electrical impedance of a headphone depend more on the cable or on the headphone itself?
I'm currently considering buying a defect headphone with a built-in broken cable which would be quite expensive otherwise. I'm quite sure I'm able to solder a new cable onto the headphone to fix it.
My question is the... |
H: Altium Designer: Is it possible to switch layers in an entire library at once?
I am using some integrated schematic/footprint libraries that I downloaded from the internet in a PCB project I am working on. In these libraries, they put 3d component bodies on mechanical layer #1, while all my other libraries have 3d ... |
H: USB OTG Cable Shielding
I just soldered a USB OTG cable to connect a keyboard (regular USB-A) to a Raspberry Pi Zero (micro-USB).
How to wire the VCC, GND, D- and D+ pins was obvious and the cable works. However both connectors have a pin that is connected to the connectors metal enclosure. The cable I used has a ... |
H: Can 12v dc circuit spark and start a fire?
I'm new to electronics and electricity. I have the following scenario:
I am wiring a LED light switch and mounting it into wooden cladding. My concern is, can the wires spark unexpectedly and start a fire?
We are talking about 12V DC, with three, 2W LEDs. The circuit is ... |
H: Does this solar charger PCB design satisfy the layout requirements of the step down charger?
I'm implementing the reference design for lead acid batteries for the LT3652 battery charger for solar power IC (see datasheet page 26).
My circuit is identical to the reference design except for the addition of two status ... |
H: High Frequency Transformer - Efficiency
I would like to ask how much is the maximum efficiency of a High-Frequency Transformer (In my application P=10 kW, f=25kHz ), considering the winding resistance, the core losses as well as the magnetizing inductance.
I saw a research about a 1 MW High-Frequency Transformer ... |
H: Why would you connect AC ground to an isolated DC power supply output?
I have been working on this question for a while now. I have read, and learned a lot, about power supplies, ac power, and safety. But one thing I just cannot seem to understand is why one would connect the AC ground (or protective earth, or fu... |
H: How to detect open circuit conductor inside opaque insulating sheath/cable
How to detect open circuit conductor inside opaque (untransparent) insulating sheath/cable in small scale. I meant the cable diameter only 1 - 1.5 mm with suspected spot within 10 - 20 cm length
AI: Connect the broken wire to 117VAC, and sli... |
H: Creating a timer in an RC circuit
In the book "Electronics For Dummies" there is a paragraph called "Creating a timer".
If you’ve got a buzzer that requires a voltage of 6 volts in order to sound off,
and you’re using a 9-volt battery to power your little scare circuit, you can
build an RC circuit like the one... |
H: 12V blade fuse box type of connectors - identification
I have a following appliance (blade) fuse box:
1) How these four connectors are called? Do they have a name?
2) What is the best way to connect a cable to it without soldering such that the wire is tied down and won't move around?
I can't find any specifica... |
H: Calculate Buffer Op Amp Output Impedance (With Data Sheet)
For a given op amp, in my case a OPA197 by TI, I'm trying to calculate the output impedance for a near DC signal.
The datasheet gives an "open loop" output impedance of 375 Ohm, to me that seems high, unless I have lulled myself into believing op amps are m... |
H: AXI interface of an FFT core expecting more data than it should
I am working with the FFT v9.0 core from Xilinx.
The FFT is configured to use the Radix-4 Burst I/O architecture.
When I reach the last element of my signal, I set s_axis_data_tlast to 1 (while transmitting the last data point) and set it back to zero.... |
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