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H: I need help for soldering. Is this good flux for use on PCB/Electronics?
this is a specific question to a product for soldering.
I am a newbie to soldering so be kind.
To be honest I was trying to learn soldering and watched videos and read some.
But in germany there seems to be an unwritten law to make finding the... |
H: Simple receiver unwanted selectivity
simulate this circuit – Schematic created using CircuitLab
In an earlier question I asked help building a simple RF receiver/amplifier. Thanks to help from Andy aka I was able to build the circuit above.
I'm using a function generator and a long piece of wire to transmit. To t... |
H: Why won't you get electrocuted with a car battery unless you touch ground and positive?
First, if you have a better suggestion for title I'm really opened to suggestions, but it is the best I came up with.
If I touch an electric line and the earth, I will get electrocuted.
However, if I touch the positive of a car ... |
H: how powerful a stepper motor do i need
I had some nema 17 style stepper motors from an old prusia i3 and tried to use them to automate my blinds but noticed that they weren't powerful enough for my blinds. I used a basic newton meter to check the amount of weight i need to apply to move the blinds and it's roughly ... |
H: Extending an HDMI port or Display cable?
I am working on building this project for my Raspberry Pi well I need to extend the HDMI port of this monitor http://store.hp.com/us/en/pdp/hp-22er-215-inch-display
I need to place the display in an enclosure, so the horizontal HDMI connector with a regular cable would cause... |
H: How do dual RC filters interact?
A high-pass RC filter with a corner frequency of 340 Hz can be built with a 47 Ohm resistor and a 10 uF capacitor.
A low-pass RC filter with a corner frequency of 3400 Hz can be built with a 47 Ohm resistor and a 1 uF capacitor.
But what if I combine the filters, using only a single... |
H: Chip antenna PCB layouts and matching network
I am designing a PCB layout for NXP JN516x Wireless Microcontroller (http://www.nxp.com/docs/en/data-sheet/JN516X.pdf). Part of the design is the antenna, where I have to choose a 50ohm antenna. I decided to go with a chip antenna (https://www.digikey.com/product-detail... |
H: What are the compulsory tasks of a charge controller for a lead acid battery?
Solar charge voltage regulators should coordinate the charging process of a battery. Suppose that I would like to design a very basic charging regulator controller with the following specs:
The battery charged is a 12V 12Ah lead acid bat... |
H: strange behavior for atmel 16
here is the code
#define F_CPU 1000000UL
#include <avr/io.h>
#include <avr/io.h>
#include <util/delay.h>
#include <avr/interrupt.h>
int main(void)
{
DDRA |= (1 << PA0);
DDRB |= (1 << PB0);
DDRD |= (1 << PD2);
MCUCR |= (1 << ISC01);
GICR |= (1 << INT0);
sei();
while(1)
{
if (PINB =... |
H: Set a reference voltage: using a zener diode vs using a buffer
Given the following hysteresis comparator circuit:
simulate this circuit – Schematic created using CircuitLab
R1, R2 and OA1 are used to set a reference voltage for the comparator with hysteresis OA2. The circuit works fine but I was wondering whether ... |
H: How do you design a switch input to a MCU for ultra low power consumption?
I'm trying to build a low power door monitoring switch. I'm using an MSP430FR2311 with the below circuit. The switch is a SPST reed switch and there is an internal pull-down resistor on pin P1.0 of the MCU.
When the switch is open power co... |
H: What is the function of these extra capacitors around the bridge rectifier?
I'm looking at different bridge rectifier circuits and found this one. Capacitors C5-C8 are smoothing capacitors. Both positive DC and negative DC have capacitors C1-C4 linking to both AC lines.
What is the function of C1-C4?
simulate this... |
H: Battery Terminals Connected to Earth
The circuit below contains a battery light-bulb circuit connected to Earth.
If the distance between points A and B where relatively small, then one could see that the earth would be acting as a sort of resistor (practically speaking, as soil has some resistance) and the lightb... |
H: How do I desolder these specific points?
I'm currently attempting to replace some bloated caps on an old PC motherboard but am currently having problems with some specific points.
Here's a pic of the motherboard:
.
The area outlined in fuchsia are the series of caps I am trying to desolder. Notice they are in pairs... |
H: Basic electronics: input currents of multi-port sub-circuits
I am simulating, with PSpice, the transient behavior of an analog circuit that contains several multiport sub-circuits.
When I probe the current on all inputs of a sub-circuit, I see that the sum of all input currents is different from zero.
Is it possibl... |
H: Analyze Power Amp 2N3055 Wit Multi Diff amp
hi guys i have a problem on analyze on this circuit
and i don't know how i resolve these
1- There Is a CE One Stage After Of Diff Amp But I Don't Know Why used This And Why Used Capacitor?
2-After Of Last Stage There are Two Diode Junction On Transistors and
(variable r... |
H: Multistage OA, DC or AC coupled?
I have a multi stage OA amplifier (pulse applications) and I am not clear if better use AC or DC couple stages (C8 in this example). I removed caps for better response, charging and discharging through high resistors.
The REFH is VDD/2 and simulation looks nice but I question there ... |
H: How to dynamically regulate voltage from a DC power supply to motors
I'm currently trying to take an approximately 12V, 2 to 3 Amp, LiPO battery and dynamically (using either a microcontroller or a good old fashioned dial/slider) adjust the voltage it is supplying to a pair of hobby motors, probably bottoming out a... |
H: RC Submarine Charging Port
I bought a cheap RC Submarine. Similar to the cheap RC Helicopters it's charged via a cable from the Remote Control. The Remote Control is powered via 6 AA Batteries. --> Here's a picture of the Charging Setup
Question: I lost the charging cable and since it's a cheap device I'm not able... |
H: In a shared wireless channel, what are the factors that impact channel gain for each user?
Assume a wireless channel with bandwidth B is shared among N mobile device users. Let's say the size of data transmitted by each device is in the range [100, 1500] Kbits.
How does the transmission power of each device and t... |
H: How do I increase 3A fixed output current of a buck converter?
Basically I am making a solar inverter without any battery or charge controller that will directly convert the dc output coming from solar panels (6 connected in parallel) into 220V AC.I am using solar panels 50W each, having an open circuit voltage of ... |
H: Headphones volume controls do not work after 4 pole jack repair
I have been repairing the jack for my pair of Sennheisers for Android (I have done 3 attempts so far) but I can't seem to make the volume controls work.
To clarify, after the repair, the sound is alright, the microphone also works but none of the butto... |
H: What is the truth table for a logic NOT gate with two inversion bubbles?
I am currently reversw engineering a PCB and it contains a D-type register chip. The chips internal circuit diagram shows a NOT gate with two bubbles on it both in the front and the back. My question is if this is the same as a buffer or if th... |
H: SSR fires from nearby relay
I am using a SPF240D25R Solid State Relays - PCB Mount PCB SIP 240VAC, 25A load current and 4-15VDC trigger voltage. This is being triggered from a ULN2003A and used to drive a motor (pump).
On the same board I am driving a 5V coil relay which has 12VAC across its contacts with no load, ... |
H: I need explanation on some digital multimeter (DMM) specifications
What is digital multimeter (DMM) ranges reading; resistance : 400 ohm - 40 Mohm supposed to mean?
would it mean the DMM cannot measure a material resistive property of less than 400 ohm ?
And what does tolerance 1% rdg. indicate which followed by: 5... |
H: LTSpice, add real noise to opamp
If I will build this circuit in real life, I will probably see a mV noise with the scope due to high cascaded gain and probably some oscillations.
I use LPC358 which is specified to (Input-referred voltage noise) 178nV/SQRT(HZ). I am trying to figure out how small can be the input s... |
H: 12 to 3V DC/DC conversion at 1A
I need to convert 12V input power to 3V (not 3.3). The output current needs to be 1A or better.
My gut-reaction was to get an off-the-shelf DC/DC, but it doesn't look like there are any commercially available that provide 3V at anywhere close to the current output I need.
I also nee... |
H: Finding percentage accuracy of instruction pipeline branch predictor
I need help in understanding the solution from solution manual. The question is from the exercise 4.24.4 and 4.24.5 of chapter 4 in the book Computer Organization and Design by Patterson and Hannessey (4th edition). The question is about designing... |
H: Change of transconductance for MOSFET
This plot represents drain current versus gate-source voltage (with different ranges of temperature):
Often the transconductance of MOSFET is defined as .
What is the difference between upper equation and gm = Id/Ugs (without changes)?
AI: The transconductance is the ratio o... |
H: What do 3-digit reference designators mean?
While looking at many circuit boards and schematics, I often notice that 3-digit designators are used, for example R101 instead of R1.
What do these digits actually mean? The numbers are not in sequence, for example only a single relay, K101 may be present, still numbered... |
H: Problems understanding a MOSFET Switch
I'm currently dealing with a circuit for communication between a Microcontroller and an e-ink Display. It uses an SPI-Bus. The display is from PervasiveDisplays, and at the bottom of this website http://www.pervasivedisplays.com/kits/ext_kit there is a download containing gerb... |
H: device to make a power supply sparks safe
I have an original HP 19V power supply for my laptop. From The first time I bought it I always saw a spark on plug in the wall plug. I notice the same in many ATX power supply.
The problem is that sometimes this sparkles are so huge that switch off the general ower switch o... |
H: Are Adafruit RGB 30 LED/m flexi-strips suitable to wear in large numbers?
I am working on a project that involves using a large number of LEDs on a single garment. According to my initial design, I would need as much as 1800 RGB LEDs. I have seen these LED strips from Adafruit https://www.adafruit.com/product/285. ... |
H: What happens if you drive the output of a LM78CT05 when the input is not connected
I have a Fairchild LM78M05CT (datasheet) as a 5V regulator for a µC circuit that also has an ICSP port.
The actual circuit is the one in this question: Review of my first ever PCB design for a watering control robot.
I've seen some... |
H: Do I need to replace the transformer when switching from halogen to LED
Total noob question.
I have MR16 halogen downlights and want them replaced with LEDs. Someone told me that, if I simply replace the bulbs but not the transformer, then the power draw will still be the same (or perhaps not as improved as if I g... |
H: Buttons and encoder debouncing
I'm trying to figure out the way of debouncing encoders and tact buttons with Schmidt triggers, but I'm confused with 2 existing schematics:
simulate this circuit – Schematic created using CircuitLab
Which of those two options are right?
Values are shown for 5.0V inputs level, would... |
H: Does half stepping produce less torque than full stepping in a stepper motor?
Would running a bipolar stepper motor at half step produce less torque but smoother movement than running it at full step?
AI: Properly done (sqrt(2)/2 driven half steps), half stepping gives the same static torque as full step, and sligh... |
H: Can someone help me figure out instinctively whats going on here?
V4 is intentionally left disconnected. I understand that this is an open circuit and current cannot flow. What I'm trying to understand is why does Vout = 5V and not 8.2 V. What key assumption am I missing here?
AI: There is no current through \$R_1\... |
H: Why include a small resistance between op-amp stages
I have been reading through TI's reference material on constructing a current source.
http://www.ti.com/lit/an/sboa046/sboa046.pdf
In figure 52 there is a 150ohm resistor included between the output of the instrumentation amplifier and the input of the OPA633 op-... |
H: Strange drop in voltage on Eneloop AAA-Batteries
I have a device in my flowerbox where I monitor soil moisture.
The device requires about 3.3 v (it's an Arduino pro mini with an ESP8266).
The device is running on 3 x AAA-batteries (should be 3.6 v)
The device runs a cycle of:
Powering on ESP and Sensor
Collecting ... |
H: Grounding solar controller
I am wiring up the solar system in my van and I need help with claryfing some things up.
I have a Phocos CA08-2.2 controller and in the manual one can read:
Be aware that the positive terminals of the controller are connected internally and therefore have the same electrical potential... |
H: Why does the voltage double in a doubler-circuit?
I’m having a hard time understanding how the final voltage is achieved.
I understand that in the first half of the sine wave the first capacitor gets charged to 1V.
In the 2nd half the first one is already charged so the 2nd capacitor gets charged to 1V as well.
Bu... |
H: Reducing voltage in power supply with diodes
Hello there i am building a variable power supply as a summer project. I have ordered some parts, and want to begin building it. I start with the transformer power supply:
I've ordered a transformer (230 V - 36 V) and i expected it to give a output voltage of 36 V peak (... |
H: Can I run a stepper motor rated 12V with a 24V or above power supply?
We are using this stepper motor (https://www.sparkfun.com/products/9238) in our project. In its datasheet, the motor rated voltage is mentioned as 12V.
How is motor rated voltage different from max Voltage?
How can we determine the max voltage ... |
H: USB Descriptor: iInterface and iFunction - is there a point?
In a USB Configuration Descriptor you have the option of providing iFunction and iInterface string descriptor indexes to Function Descriptors and Interface Descriptors respectively.
Is there any point to implementing these descriptors? Adding them, I can ... |
H: Atmega32A and relay module cant turning water pump on
I have some problem with water pump.
So I use atmega32a and 5v relay module to turn water pump on for 5 second, but in reality the water pump can't last for 5 second. Just after water pump goes on, atmega32 has a strange behavior that makes another component li... |
H: How to change pad size in design rule in Eagle?
I’m very new to Eagle. When learned to create a library I followed these instructions from Eagle’s documentation tutorial:
“Default value for pad diameter is auto. It should not be changed. The final diameter in the layout results from the values given in the Design R... |
H: What is this white circle on this circuit?
I found this circuit inside a LED reflector that turns on and off at regular intervals, and there is this white circle in it. I am guessing that it somehow keeps time of the intervsle, but can someone explain it to me? Also, I found this same circle on another device with ... |
H: Current limiter - charging battery from battery
I'm planning to charge auxiliary battery from car's alternator, by using voltage sensitive relay to connect positive poles of car's battery.
The only obstacle now is that auxiliary battery (12V) allows maximum charging current of 20A. Therefore I need current limiter ... |
H: Current limit of switch mode power supply
I have a premade SMPS, it is 12V and maxes out at 8.5A. I have a TEC1-12706 on one pair of terminals and there will be a fan on the other terminals (I only have a total of 4 terminals for out). I would like to limit the current for the fan. How would this be done?
The PWM c... |
H: Variable DC Supply "Ignoring" Potentiometer
I printed a board meant to supply a variable 5–250VDC from this open-source schematic:
This was my board
with this schematic (excuse my silly device symbols)
but I can't get the output voltage to vary. With the 5k potentiometer (the box at the bottom center of the boar... |
H: What makes a good soldering station
I am a hobbyist looking to buy a soldering station. The market for soldering equipment ranges from $10 to $1000.
This begs the question:
* What is the reason behind these huge price differences?
* What attributes should I look for in a good soldering station?
I researched a ... |
H: MOSFET Basic Biasing Problems
After a lot of theoretical studying of MOSFETs, I decided to try out at least the basics of it in practice.
Here is the first circuit I ever made using MOSFET:
simulate this circuit – Schematic created using CircuitLab
https://www.onsemi.com/pub/Collateral/BS170-D.PDF
I haven't used r... |
H: Power output for Sager HVGC 65
I wish to get 12VDC @ 4 amps from Sager HVGC 65 Watt power supply. Datasheet: https://www.sager.com/_resources/pdfs/product/HVGC-65.pdf
I have attached a picture of the datasheet. I would like to use the HVGC-65-1050. I am confused because it says current adjustment is only from 650 -... |
H: Choosing the right Schottky for the voltage/amperage
What do these ratings mean when it comes to reading datasheets for Schottky and how do you pick a diode based on these ratings:
Current, Forward, Continuous
Voltage, Repetitive Peak
Voltage, Forward
For example, I have a 12V / 3A line that i would like to put a ... |
H: Why does mechanical positioning of a cable has any influence on the function of electr(on)ic devices?
I think everyone has encountered this problem:
A device does not work anymore properly until you find out by coincidence a position in which it still works. For example my USB microphone has a faulty connection unt... |
H: PCB surface mount alternative for JST-XH connector
I am having a very hard time finding an answer to this, most likely because it is rather difficult to search for items without knowing the acronyms or names for the connector types.
I have a PCB that contains what I believe to be a JST-XH connector with an accompan... |
H: Recommended isolation paper for hobby circuitry
I'm having a hard time finding out what type of insulation is enough for my projects.
I will be building this: STM32 OLED Soldering Station Case Temperature Controller T12 KR BL ILS BC2 Handle Electronic Soldering Iron Tips 220v 70W
I'm wondering what type of insulati... |
H: Help understanding current direction with transistor?
I'm an electronics hobbyist struggling with the concept of transistors. I made a simple circuit with a PNP transistor based off of a diagram, but don't understand how it works.
From the book containing the diagram:
Look carefully at schematic I. You see there... |
H: lower current than expected through simple circuit powering laser diode
I have a circuit I designed for a raspberry pi to turn a laser off and on. I designed it to supply approx 22mA but it's barely getting 11mA. I've tried numerous tests but I can't figure out what's wrong
Circuit:
Vcc = 5V, GPIO BCM 21 = 3.3V, v... |
H: An alternative to a regular glass fuse
I develop a home sprinkler controller, and would need a fuse. Traditional fuses (those glass cylinders with a wire inside) take too much space, and don't play well with SMD. My research found some poly fuses, including SMD poly fuses. However they seem to be for a small voltag... |
H: Chip antenna PCB layouts
I am designing a layout for this Chip antenna "https://www.johansontechnology.com/datasheets/antennas/2450AT18B100.pdf". In the datasheet they have Test Board as an example layout. I have a couple of questions on their test board. As shown in the below layout:
I am not sure what no groun... |
H: Controlling power with Isolated DC-DC Converter remote on off vs Relay
I am designing a simple PCB with multiple DC to DC converters. One in particular is an isolated DC to DC converter with a remote on / off pin (to turn the converter on and off).
Currently i have in mind of connecting that converter to a general... |
H: Is connecting a 12V circuit to +12V and GND the same as connecting it to GND and -12V?
After reading What is negative voltage? and the answer given by kellenjb I wondered if I understood the topic sufficiently, and started theorizing. If the + or - sign is just a convention and the voltage is the potential differen... |
H: Running high powered/current LEDs with high frequency
firstly i would want to thank all who are willing to help me in this problem that i am facing.
So to begin, i am a high school student doing a final year project. Basically i have to create a circuit where by a 1000Hz frequency is an input that i have to alterna... |
H: How to show only Ground Plane in EAGLE
Is it possible to show only the ground planes like the one given in the figure?
Thanks
AI: To my knowledge EAGLE displays signals and layers, thus if you click show onto the ground signal, it will also highlight areas with all vias, pads and other tracks (depends on what you m... |
H: What is a good alternative for the UA741 opamp in hobby projects?
Related to What's the uA741's appeal?, a lot of schematics use this rather dated opamp. My follow-up question would be: What is a good alternative?
Of course if you have specific requirements you just search for the correct part. What I'm talking abo... |
H: Dual JK Flip-Flop Toogle Feature
I'm trying to make an 8-bit Display using 4 seven segment displays being driven by a single EEPROM (like in this video). From the video, I used the design of the 555 timer and a dual JK flip-flop to count 0 to 3. The clock works, however, when I wire the flip-flop in the same way ... |
H: How to use two of this DC-DC converter synchronously to get more current output?
This is the DC-DC converter: http://cds.linear.com/docs/en/datasheet/37911fb.pdf
There is a clockout pin in the chip and in the datasheet it says:
CLKOUT (Pin 33): Clock Output Pin. A 180° out-of-phase clock
is provided at theoscill... |
H: BLDC motor emergency stop
I'm into a preliminary design of a eletrical vehicle that uses BLDC permanent magnet motors for motion (3 phases 36V 300W hub motors in wheel). For safety compliance this vehicle needs to provide a breaking mechanism that stops the vechicle when there's a power failure. My first choiche wi... |
H: Controlling BLDC with IR 2130 - stuck at fault, unable to reset
I'm working right now with the following circuit, trying to drive the BLDC motor with it.
I don't exactly know how it works (especially the overcurrent sensing part) and the man that designed it is currently unreachable so I can't simply ask him.
I'm ... |
H: Crosstalk through I2C
I'm using an Arduino to communicate with I2C magnetometer sensors. The parts list and a basic block diagram of the wiring is shown below:
HMC5883L Magnetometer:
https://learn.adafruit.com/adafruit-hmc5883l-breakout-triple-axis-magnetometer-compass-sensor/overview
TCA9548A I2C Expander:
https:/... |
H: A Series-parallel circuit combination with current as input source
I am asked to find:
1.) the voltage drop |V|
2.) Current i1
3.) Current i2
So far I only managed to find the total resistance and total voltage which is 6 ohms and 72 volts respectively. I am really confused on where to start or what to find first.... |
H: Lms43PD-05-CG Photodiode Troubleshooting
Datasheets:
Will post below since I can't post more than two links.
LED circuit schematic:
Photodiode circuit schematic:
Details:
The resistor value for the LED circuit (top right) is 24 ohms rated at 5W.
The resistor value for the photodiode circuit is 33 ohms.
The op am... |
H: Conjugate, non-conjugate and single poles in an RLC circuit system
In all the texts I encountered so far, I find the following pole-zero diagram example for an RLC series circuit:
The transfer function for the above circuit can be found as:
H(s) = XC/(R + XL + XC) = (1/sC)/[R + sL + (1/sC)]
H(s) = 1/(LCs² + RCs + ... |
H: Caesar cipher - digital circuit
How do I create a combinational circuit that encrypts a message using Caesar's cipher?
And another circuit that decrypts this message?
I thought about using modular arithmetic, but I did not find a simple way to do that either.
AI: I thought about using modular arithmetic
Yup, that's... |
H: AC vs. DC in Low Speed, High Torque application
My club is building a 1/4 scale utility tractor (around 800 lbs) and for the past couple of years we have been using an electric hybrid drivetrain. Our system has been a 32 hp gas motor powering a DC generator which we convert to 3 phase AC to power our independent wh... |
H: Why does this optocoupler's datasheet recommend splitting a current limiting resistor in two?
And not only that, they also want to keep a ratio of R1/R2=1.5
The opto in question is ACPL-M21L by Broadcom
Here's a link to the datasheet:
https://docs.broadcom.com/docs/AV02-3462EN
Thanks.
AI: What @Andy said is basic... |
H: How would I make a circuit that takes a voltage (V) as input and outputs min(V, Vref)?
Simple question, how do I turn the following block diagram to a real world working circuit?
I know I could use the following:
1) A comparator, but that will give me only either +Vcc or -Vcc.
2) I could use a rail-to-rail compara... |
H: Encoders debouncing with 7414 at 3.3V
I'm trying to make a small module that has 2 rotary encoders (both have build-in push buttons), hardware debouncing circuit and have to be compatible with both 5.0V and 3.3V microcontroller logic inputs.
What I've found, that most typical schematic involves the inverting Schmit... |
H: Finding state equations for an RL circuit with inductors in T configuration?
I'm working on an exercise which asks to "Identify state variables and write apropriate state equations" for the following circuit.
simulate this circuit – Schematic created using CircuitLab
Trying to find the answer I get the following s... |
H: NPN transistor wired correctly?
i'm experimenting with transistors, and wired one to my circuitboard. Though I got the LED to turn on with a NPN transistor, I'm not sure it's setup properly.
I read that current moves against the direction the arrow is pointing for the transistor symbol (emitter to collector), so... |
H: Measure small voltages in a high voltage circuit
I'm troubleshooting an oscilloscope where the cathode voltage is ca. -2000V respect to ground and chassis. There are parts of the circuit (eg. the heater filament, or the blanking / un-blanking circuit) which generate low voltages but they are connected to HV supply ... |
H: Meaning of Sigma in Laplace transform
I found the question below in a forum and I also have same problem. Unfortunately, there is no answer at all so I will post it here hope someone could make it clear.
A gain relation in a circuit of RCL and dependent sources ends up in an H(s) which is a quotient of polynomials ... |
H: How to interface SIM800L to UART on STM32F103
I have problem to interface SIM800L with STM32F103. I just read SIM800L datasheet that UART logic level is on 2.8 V. But the STM32F103,can be operated in 3.3 V. I connected my TX RX pin directly to my MCU. I send AT command but nothing happen. Am I doing something wrong... |
H: Would an ATX PSUs internal fan work as the dummy load for a benchtop power supply conversion?
The PSU has 2 12V rails listed in its specs on the side, however both show continuity between them when I tested it with my multimeter. I then tested continuity between the positive from the fan and 12V1 and it also showed... |
H: Can a person suffer mild electrocution if he answers a charging phone with wet hands or sweaty palms?
This texas girl got electrocuted and died while using her cellphone in the bathtub. Can a person with wet hands or sweaty palms face mild electrocution if he answers the phone while it is being charged?
https://www... |
H: LTSpice resonant circuit simulation non-idealities
I just simulated the following circuit in ltspice XVII:
A parallel resonant circuit is tuned to 125KHz with varying capacitor sizes. Then a voltage divider is formed with a resistor.
These are my settings for the inductor, capacitor and in the Tool Panel. In my un... |
H: Can I read EEprom in circuit when connected to a SH7055 MCU?
I am trying to read a microwire 93C66 EEprom which is connected to a Hitachi SH7055 MCU. The device is a complete automotive ECU. I need to be able to do this in circuit.
Currently I get an error when I try to read so I assume I need to hold the MCU in e... |
H: Power on configuration for MCU using CPLD and pin multiplexing
simulate this circuit – Schematic created using CircuitLab
Suppose we have simple same here. The logic behind this is very simple. During MCU boot it tests pins CONF1 and CONF2 for data on it (LOW or HIGH) and configures its internals based on this. A... |
H: Speaker vs. amplifier wattage matching
Is there any rule-of-thumb for choosing amplifier wattage for the given speakers wattage?
For example, I have speakers, 100 W (max. input power) / 6 Ohm each. Is it ok to match them with 44 W (min. continuous power) / 8 Ohm / channel?
In general, is it ok to hook up large spea... |
H: What is the failure mode of a solar panel?
I have understood that solar panels don't last forever. Warranties are typically a couple dozen years, and you can expect your panel to last for perhaps twice the warranty period.
But what does exactly happen when the panel is failing? Does it fail suddenly like computer h... |
H: Why do inductors like these do not work
I was trying out a series RLC band stop filter on hardware but for some reason it was not working, I later figured out that the culprit was the inductor after testing both inductor and capacitor via the RC and RL filters, I tried different inductors of the same kind, even of ... |
H: Solutions to store GUI elements in an embedded systems
I have a project in mind to create a GUI using a STM32F4 microcontroller. I am currently working/playing with a STM32F469I-DISCO board that embeds a MIPI Display. I understood how to display images and others stuffs but I was wondering what are the solutions to... |
H: How can I temporarily short-circuit two adjacent poles on a circuit board cheaply?
On the image below I need to short circuit GP100 to enter flash mode on an esp-chip. I can't afford a soldering iron atm (and also don't know how to solder). I'm currently trying to do it by holding small screwdriver between the pins... |
H: How does the Nintendo 64 detect a controller is connected?
To give some context, I am trying to emulate controller input to the N64 via a GPIO pin on the Raspberry PI.
In an attempt to accomplish this, I have one of the PI's GPIO's in a pull-up configuration connected to the data line of the N64 controller input on... |
H: Reverse current blocking on switching regulator
I was thinking what is the best solution to add a reverse current blocking on switching regulator. My first thought was to look for an ideal diode circuit but all of them were too much expensive. The cheapest solution was to put a simple diode but they've got signific... |
H: μC <-> USB <-> μC advice please!
I'm working on a radio receiver project based on using a Uniden BC125AT, which will be controlled by an external microcontroller.
The original plan was to tap into the BC125AT keypad to issue keypresses etc, an ugly solution, but it works.
But the BC125AT has a USB port for prog... |
H: How to charge this lipo back?
I have made a lipo battery pack with 2 identical 3.7V 1400mAh battery packs connected in series.
This pack is being used in a wearable project where I wear this pack on my wrist.
Now to charge it up, I have a TP4056 1A single cell lipo charger. Now my charger allows me to charge one ce... |
H: Doubling 150VDC
I'd like to double the 150–220VDC 50mA supply from this Nixie power circuit, for use with electrowetting, but I'm not sure of the best method. Most boost converters I've seen require a low input voltage, and I haven't seen any other circuits that do DC-DC voltage multiplication (though I am almost c... |
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