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H: Which DC-DC converter power supply to choose for a 6A motor from a 7.2V battery?
I'm looking to build a motor controller where I want to have consistent motor performance. Normally you have a 6v DC motor and you can plugin a 7.2v battery pack directly and be fine, but the motors start out running really hard and s... |
H: relationship between modulation index and carrier-suppressed condition in fm
What is the relationship between modulation index and carrier-suppressed condition in FM.
What should the modulation index be when the carrier is suppressed in FM?
AI: The answer to this fills whole chapters of some large textbooks[1], but... |
H: Quantization noise and Quantization error
What is the difference between the quantization noise and quantization error in ADC?
I understood that the quantization error you get when you convert analog to digital and quantization noise when you convert from digital to analog.
AI: The quantization noise is an abstract... |
H: Is there any standard which defines that a particular connector or header on PCB has to be male or female?
Is there any standard which defines that connector (DB9, DB25, USB or header) type has to be MALE or FEMALE while choosing one to use on circuit board?
I am designing a microcontroller circuit board for gene... |
H: Common anode 7 segment display
I've hooked up my arduino to a 7 segment display with a common anode..
At first I thought it wouldn't work at all because I was setting the pins on the cathode side of the LEDs to high.. then I discovered when I set the pins to the cathodes high the LEDs turn off..
Which is good, bec... |
H: Taking the limit of voltage division equation
I'm required to take the limit of the voltage division equation(internal voltmeter resistance included as Rm) when Rm goes to infinity to show that the limit equals to the basic voltage division equation.
\$\varinjlim_{R_m\rightarrow\infty}\ \dfrac{R_1V_s}{R_1+R_2+R_m}\... |
H: Current Transformer with pic16f877a
I am currently working with a current transformer (CT) to measure the load current of a system. I am connecting the CT with a pic16f877a microcontroller using a basic circuit I found on the internet. I have implemented this circuit pictured below and connected the CT but it did n... |
H: Voltage regulation on the high side of a Darlington array?
I'm looking to build an 3.3V Arduino Pro Mini based LED driver that drives 3 (possibly 6) super bright 10mm LEDs (R, G and B).
I intend to use this 3.7V LiPo battery and these LEDs.
The LEDs have the following specs (units are V, A and Ohm). I've calculated... |
H: 22J 6KV and 33J 6KV are two kinds of ceramic cap that seems to be burned out. What do I replace it with?
These capacitors are located in power supply module DPS-279BPA section where it is marked with high voltage area. It is a Phillips LCD televisionPhillips 37PFL5603D/10 with no picture and audio, Though it shows ... |
H: How do I know where to place resistors on my circuit?
Some of the books I have state that power comes from the negative terminal on the power supply.If that is the case, the circuit starts from the negative right?
Say I have a simple circuit with a 6v supply, an 1K resistor and an LED. If I wire the resistor to the... |
H: What makes a display visible in daylight (such as the Pixel Qi)?
What characteristics of the Pixel Qi display make it visible under daylight conditions?
It seems to have something to do with "daylight grayscale". But what exactly does "daylight grayscale" mean? Is it something that can be accomplished/reproduced ... |
H: How to build a switch with Bluetooth?
I have a small circuit with a battery and a lamp. If I close the circuit the lamp will turn on, otherwise will turn off.
I want to create a very small wireless switch. It will have only 2 signals to understand:
Turn On (close the circuit)
Turn Off (open the circuit)
The cir... |
H: Powering sub-sytems on a robot with a single battery
I am making a robot for a project, and have a quick question about the power system for my robot. I have to power an AVR MCU (5V), 6 servos (also 5V), 4 dc motors (12V), and a camera (9V). I really want to use just one battery for the whole robot. I was thinking ... |
H: Decoding multiple quadrature rotary encoders
Scenario
I have 4 ACZ16 quadrature rotary encoders connected to GPIO Port D on an ATMega168P. I am only trying to extract rotation direction from them. Position is irrelevant, and it is guaranteed only one encoder will rotate at any given time. Debouncing is handled in h... |
H: Raspberry Pi USB-to-Serial Atmega328
I understand you can create a serial transmission between the Raspberry Pi and an Atmega328 using the GPIO:
http://www.raspberrypi.org/phpBB3/viewtopic.php?t=22736&p=293668
I'm interested in having more serial options, like the USB ports. I managed to do so, but with an Arduino ... |
H: How do I know what the right signal amplifier to use is in order to program a hall-effect sensor?
I am trying to look for a signal amplifier in order to program the sensitivity and offset of the A1362 Hall-Effect sensor.
Doing a simple google search reveals:
http://www.amazon.com/RDL-ST-VCA3-Voltage-Controlled-A... |
H: Groundplanes for Wideband synthesizer
I'm build a synthesizer (up to 2GHz) and got a questions regarding the gound planes (analog vs. digital).
According to the datasheet (p. 7) some pins must be connected to analog GND, ex. pin 10 must be connected to the analog GND plane.
http://www.analog.com/static/imported-fil... |
H: STM32 USART loopback
Is it possible to connect the Rx and Tx pins of the same USART or on two different USARTs on an STM32 discovery board to make a loopback and test the USART?
AI: You can do anything with USART lines as long as you stick to one basic rule. To understand this rule, you have to understand how the p... |
H: bridge rectifier connected to a raspberry pi gpio
I'd like to connect a bridge (full wave) rectifier to my Raspberry Pi (RPi), GPIO pin 22 (configured as an input). I have configured the rectifier such that it has a 120VAC input and 3VDC output (I used a voltage divider on the DC output). The circuit works fine. I'... |
H: How to ensure that a pin never floats
I am making a DAC circuit with uses an AD7541A chip which is going to be connected to another board with a microcontroller on it. Now the AD7541A gets fried if someone turns it on while all the pins are floating. So I want to ensure that even if someone accidentally turns on th... |
H: How does the collector emitter relationship work with a transistor?
So,
I'm not understanding how NPN transistors really work in this scenario. In this image, I
have highlighted what I understand to be the collector and emmiter. My understanding is
that power flows from the collector, TO the emitter right?
In t... |
H: Sending "larger than 8-bit" quantities over an 8-bit link
I have data that I logically manipulate in 12-bit quantities which I need to move over an UART link. (actually soft-serial from Mbed to PC over USB cable, but that's irrelevant)
I was thinking about using the common 8N1 (8 data bits, no parity, 1 stop bit) U... |
H: Decoupling capacitor across Raspberry Pi GPIO input (+ Arduino + robotics)
I've been messing around with a robot kit from Parallax (the BOE Shield Kit), which has a 5xAA (7.2 V?) power source. The BOE shield includes its own 5 V regulator, which is used to control servos that in turn spin the wheels of the robot. T... |
H: Can someone explain how this truth table was filled in from a Mealy model?
I'm having a bit of trouble figuring out how the truth table was filled in. I understand how to draw the diagram from the first table and I understand the boolean expression given from the truth table but I can't quite grasp how the truth t... |
H: how to use CT to measure current
I have purchased CT but don't know what his terminals means and how to identify primary and secondary coils terminals. I am software engineer but currently learning pic controller. as for I have read LM35 using pic16f877a and now working to measure load using Current transformer but... |
H: Breakout Board for 1.27 mm to 2.54 mm
Is there any breakout board like this for 1.27 mm to 2.54 mm pitch?
Example for 1.27 mm:
Example for 2.54 mm:
I also appreciate any hint how to perform this conversion on any other cheap way.
AI: Many! http://www.futurlec.com/SMD_Adapters.shtml are perhaps the least expens... |
H: Can I use Eclipse CDT to debug a PIC18 using PICkit3?
I'm curious and interested in buying a PIC18 micro and a PICkit3 to do some programming on a breadboard, to learn a bit. I like using Eclipse CDT for C development quite a bit.
Is it possible to use Eclipse rather than MPLab X, the Netbeans version?
AI: Theoreti... |
H: DIY Inductor: Solve for number of turns without knowing the length?
I'm trying to wrap my own inductors (air coil) for an RF circuit that I am making and I am having a little trouble solving for the number of turns I need to reach the desired inductance.
\$L=\dfrac{D^2N^2}{18D+40l} \$
L = inductance in uH
D = co... |
H: PIC turns on with the Rx pin
If I connect the Rx pin of my PIC18F2550 and GND to another already powered-on circuit, the PIC turns on and starts running code. There is nothing in the datasheet preventing this.
Is this normal?
PS: Rx and SDA are connected toghether, but still the PIC shouldnt turn on at all.
AI: Y... |
H: What's the best/easiest way to measure an unkown inductance without an RLC meter?
Is there a decent way to measure inductance accurately using an oscope and a function generator? The best method I can find is to build a tank circuit and sweep the frequency until the highest voltage appears. Then use the formula bel... |
H: STM32 - PC serial communication
What are the available options or ways to connect the STM32 discovery board using UART to a PC via USB or the serial port? What is the required hardware/cables?
AI: As Chris mentioned, you can buy a FTDI RS232-USB converter. They're really popular and are cheap. Here's one:
https:/... |
H: What should I get to desolder components from random boards
After failing trying to use my friends blow-torch to De-solder components from all these circuit boards and burning them badly and probably both of us getting lead poisoning and smelling the crap all day, I decided that I were to invest a bit of my money o... |
H: Degradation of AC signals as inputs of inverter amplifier circuit
i recently, did a configuration of an inverter op amp model and i fed it with an analog signal of the form$$S(t)=2sin(1000t\pi)$$
As you may know, the general response of an inverter Op Amp (741), is the additive inverse of the resistance pluggers to... |
H: Amperian loop to measure solenoid's magnetic field
My textbook proves the formula \$B =\mu_0In \$ for a solenoid by taking a rectangular Amperian loop as shown here:
The problem I see with this though is that it only takes into account the contribution of the current going out of the page since the loop only surr... |
H: 4 bit mux input/outputs
If i have a 4 input mux with the output being in the form of
S1 AND NOT(s0)
MY truth table therefore looks like the following (remember NOT(S0)).
S1 S0 X
0 0 0A
0 1 0B
1 0 1C
1 1 0D
Does that mean that the inputs have to be A=0 B =0 C=1 and D=0 in order for the... |
H: Why is open hardware so rare?
I'm trying to understand why open hardware is so much harder to come by than software. I've tried looking around online and I couldn't find as satisfactory explanation.
I understand that hardware is so much easier to keep proprietary and so much harder (impossible) to reverse engineer... |
H: Relationship between the circuit bandwidth and the gain for an inverter op amp
do you know the relationship between those two quantities, for an inverter configuration of the op amp. I know graphs, but i do not know any equation or function that relates those two quantities.
AI: The two quantities on the graph you ... |
H: Analog to Digital converter module of MCU - Conceptual question
Please consider the following codes:
//Code Sample 1
void func_val(void)
{
unsigned int val;
ADCSC1 = 0x00; // sets the required channel.
while(!ADCSC1_COCO); //check for conversion complete flag.
val= ADCRL;
}
//Code sample 2
void EvalProx()... |
H: Is it true that CISC architectures generally consume more power than RISC architectures?
I keep hearing CISC architectures consume more power than RISC architectures. This is said to be the reason for using RISC architectures for low-power applications. I am a skeptic, I think it could be possible that the low-powe... |
H: What would happen if I inject the charges (ESD) at PCB many times and PCB is completely floated (isolated) from the earth?
Just I wonder:
If I inject the charges (ESD) at PCB many times and PCB is completely floated (isolated) from the earth.
Will charges be dissipated or remain?
I think charges will be charged in ... |
H: Is there a default state of a configurable IC?
I am making a USB hub and the controller chip is configurable, but i am wondering if the hub can work without configuration, if I can put a bunch of no connect flags on half the pins.
Here is the datasheet. I am using the USB2514B version.
AI: 1.1, first sentence: yes,... |
H: Was the last mile copper wire not the limitation in dial-up internet service?
My local internet service providers can provide ADSL (asymmetric digital subscriber line) service at various speeds, for example, 50 M bits per second. This service is in Canada.
Is this typically provided on the same twisted pair of copp... |
H: What direction of force on the conductor in a magnetic field?
The question:
The answer:
In my opinion the force should be UP!
Source:
PPI PE Power Practice Problems, 4th Edition – Over 400 Electrical Engineering Practice Problems for the NCEES PE Electrical Power Exam
John A. Camara PE
Publisher : PPI a Kapla... |
H: Capacitor on output of regulator causing short circuit
We were using switching regulator and when we turned on the regulator short was found.
C285 was damaged. After removing C285 , regulator worked without any issues. We were suspecting inrush current due to capacitor placed before inductor. Can there be some othe... |
H: Can anyone please help me identify this diode and possibly link me to a datasheet
I need to replace this part on another identical board. Any information on what type of diode this could be or maybe a datasheet link. I have searched the internet and I have come up empty handed.
AI: It is an ON Semiconductor MRA4004... |
H: lowering output level of a phono preamp
I built a RIAA phono preamp that works great from these schematics:
But the output level seems a bit too high. What would be the best way to lower it?
AI: The simplest solution might be to use a resistive divider in the output. Alternatively you could increase R5,11 and dec... |
H: What effect in the current will have the change of the diameter of coil but same length of coil and same magnetic flux?
First image is one coil with the large diameter and a magnet rotating to create current in the coil. Second image is the same set but the diameter of coil is smaller.
AI: I will take the induced v... |
H: Is it safe to exceed the power supply current rating for a pump?
I want to buy a water pump that has capacity DC 3.5V-9V 3W which by my 5V USB charger makes 0.6A. My charger has output 5W 1A. Is it safe to exceed the 0.6A value by 0.4A?
AI: It’s never wise to exceed rated current with surges without storage capacit... |
H: IC protection diodes confusion
This question is (loosely) related to my previous question here.
I wanted to check the ESD protection diodes of the LPC1114 MCU from NXP. So I measured all pins on a brand new LPC1114 MCU with a multimeter in diode test mode and I am confused about the results.
Measurement setup 1:
C... |
H: Weird result when finding ripple bounds of RC circuit with square wave input
If \$V_{ext}\$ is applied to a RC circuit, then voltage across capacitor is given by: $$v(t) = V_{ext} + (V_i -V_{ext})e^{-t/RC} $$
Using above to find the ripple bounds \$v_l\$ and \$v_h\$, get two equations:
$$v_h=A + (v_l - A)e^{-aT/R... |
H: Ethernet over individual wires
I am doing the integration of an aircraft device that uses Ethernet 100BASE-T as its main communication line. The manual says the device comes with its own testing cable which is approximately 2 feet long but it does not feature any twisted pair in it. Instead, the testing cable consi... |
H: Induction motor breakdown power
The question and the answer is:
However, I think there is a mistake. Below is my solution:
Since ZRotor = 0.3 + j0.35 Ω
R2/s = 0.3 Ω
from the below equation, the maximum slip can be found:
s = 0.474
So, R2/s = 0.3/0.474 = 0.632Ω
To find the current
I = 120/(0.2+j0.25+j0.35+0.632)
T... |
H: Can a ggNMOS be implemented discretely on a PCB?
Reading this answer, I ran across the ggNMOS for ESD protection.
https://electronics.stackexchange.com/a/576935/166672
Reading on the web a little, it seems that this is only used inside of an IC, not at the PCB level. However I do not see any references as to why t... |
H: GPIO protection with diodes
I've got a question regarding diodes you can see on the schematic.
In my circuit VCC is 12V (I have separated power supply for MCU) and the current on this line may even reach 1.5 A.
Can I safetly use diode like 1N4004 which has max current about 1A? I'm also not sure how this wiring cou... |
H: Connecting development board board to sensor
I am trying to connect a Nordic nRF52840DK board to the LSM6DSL sensor (accelerometer) on a STEVAL-MKI178V2 adapter board. The goal is to successfully connect the devices and test the sample program from zephyr RTOS of outputting the data from the accelerometer.
The user... |
H: Ferrite core in electromagnets
I have a small project based around designing a small home-made DC actuator using a small DC electromagnet.
My final goal is to generate the strongest magnetic field possible with the minimum amount of current, but for prototyping purposes I used a 0.5mm diameter enamelled copper wire... |
H: Maximum Ethernet bandwidth through a slip ring
I'm trying to understand what would prevent a 1 GbE non-optical slip-ring from transmitting 10GbE, 40GbE or even 100/200/400GbE. They all have 'metallic'/copper variants (backplane or short cable) and I can only find up to 1GbE industrial slip-rings in a quick market s... |
H: What can I do about using incorrect P-FET package?
I just got a PCB in I designed from fab, and I quickly discovered I made a mistake in the design. I'm using a P-channel MOSFET, D2PAK, as a high-side switch.
Its pinout is (1) gate, (2) drain, (3) source, but I laid it out as if it was (1) gate, (2) source, (3) dra... |
H: A question on timers in 8051
Suppose the timer 1 of 8051 has finished counting, and raised TF1. Since it rolls back to 0, so currently TH1=00,TL1=00, and assume the bit TR1 is still set. At this moment, if we just clear the TF1 alone , will it count now from 00 again? Because we did not stop the timer yet.
Next que... |
H: What is this binocular transformer and how do I model it in LTSPice, Have High SWR In Ham Radio
I purchased this 70 Watt Amplifier Kit and built it. Unfortunately, the kits do not come with any instructions. I have managed to find a variety of web sites where people built the amp and offered perspective. The kit... |
H: Is there a way to use "others" as index when assigning to slices of VHDL array?
Is it possible to do something like this in VHDL?
a: std_logic_vector(7 downto 0);
...
a(1 ,3, others) <= ('0','1','0');
Rather than what I do at present:
a: std_logic_vector(7 downto 0);
...
a <= (others=>'0');
a(1) <= '0';
a(... |
H: What's the change of resistance after gate high voltage failure?
I have a damaged p-type mosfet.
Resistance of drain to gate: almost zero
, Drain to source : below 10Mohm(some are xxxkohm).
I think ESD is injected into drain.
So. I want to know the symptoms(resistance changes) difference when gate insulator is brea... |
H: Is this video fake? I thought Tesla coils only worked on AC
This video shows a 9-volt battery connected to a wire as a primary.
The first reason I think this is fake is that he is powering a Tesla coil with 10 volts.
The second reason is that Tesla coils work on AC, or at least I thought so, and he wouldn't be able... |
H: What is the initial input used in a NOR gate for a reset-set latch?
What happens the moment the reset-set latch is switched on?
AI: Here's your set-reset latch implemented with your relay NOR gates:-
simulate this circuit – Schematic created using CircuitLab
At power on all relays are released, but the coils of ... |
H: IEC 61010 table for creepage distances
Good day
I am making a pcb layout that is required to comply with the IEC 61010-1. In the standard, there is a table for clearances and creepages, which depends on working voltage, pollution degree and dielectric properties (CTI/comparative tracking index). However, I am a bit... |
H: Communication between two microcontrollers with different operating voltages (5 V and 3.3 V)
I want to communicate between two microcontrollers - one is PIC18F2550 and the other is STM32F103VET. They operate at different voltages: 5 V (PIC) and 3.3 V (STM32). I would prefer to use SPI communication.
The problem is,... |
H: How to size the fuse in this case?
Inside an enclosure, this PSU(12V, 12.5A) powers all the electrical devices such as DC fans and some other DC operated devices. So basically the PSU powers everything and needs to source 8A continuously. The AC power only feeds the PSU.
AC power outlet --> IEC connector --> PSU --... |
H: Op-amp speed: bandwidth vs slew rate
I was learning about the difference between op-amp slew rate and bandwidth.
Everywhere it says slew rate is a large signal parameter and bandwidth is a small signal parameter.
I have few questions:
What is meant by large/small here, because large/small are relative terms? What ... |
H: What is a good way measure voltage considering accidental polarity reversal?
Hypothetically, if a circuit is potentially exposed to accidental polarity reversal (i.e. when a user connects positive to negative, and negative to positive by accident): When measuring the voltage using a voltage divider, I assume that t... |
H: Green circle around via in Altium
I am a newbie in Altium (have some experience with KiCAD) while placing via I am getting a green circle around via, should I be concerned about this if not how to turn this off.
Thanks in advance
AI: This could be the clearance around the via on Layer 2 (GND_1 in your design). Noti... |
H: Soft start circuit problem
I am currently working on a soft-start circuit. The picture below is my schematic. It worked fine in simulation and even in a real circuit. But after several times, turn on and off the power source (My power DC source: V=24V, 290W), the MOSFET dies for no apparent reason (Vgs = Vds = Vgd ... |
H: Totem pole driver topology (inverting amp)
Hello guys this question is regarding a gap in my knowledge regarding transistors specifically the driver of the totem pole configuration. Based on the following figure
And these results here:
When the control voltage goes high why does the base of Q2/Collector of Q1 rise... |
H: What does "top through view" mean for MSOP pin assignment?
Reading the datasheet for a USB switch IC, it says "top through view" for the pinout diagram (page 2). It seems like this means "looking from the top-down at the IC", where the notch is in the top left. Is that the correct assumption?
AI: It means you are l... |
H: What is the op-amp output voltage for a voltage-controlled current source?
I am trying to analyse the voltages in a voltage-controlled current source.
What I have so far:
Vin = V_C
V_B = Vsupply - I_shunt*R_load
However, I don’t know how to find an equation for the op amp’s output voltage at the gate of the FET (... |
H: Lazer wifi connection
Would it be possible to create a Wifi cable that uses lasers to send information at light speed?
AI: No. You are confusing several things.
Lazer wifi connection.
LASER stands for "light amplification by stimulated emission of radiation" so it's spelt with an 'S', not a 'Z'. You may be confu... |
H: Determining initial state of the circuit that uses 74HC00
I've built the following circuit that makes a push-button work like a toggle switch:
It works exactly as expected. Pressing the button once turns the LED on. Pressing the button once again turns it off. However, there is one thing I don't understand. When t... |
H: Can I connect a 1A device to a USB 3 port?
All,
If I were to connect 16 WS2182b LEDs in series (16*0.06=0.96A) and an Arduino to a USB 3 port on my PC (0.9A max I think), would my PC/USB controller get fried or would the LEDs just run dimmer?
Would this be safe to do this or would I need to use a separate power su... |
H: Do more logic gates in series mean more slowing of the output result?
I heard that every logic gate has a propagation delay in nano scale.
As the digital signal propagates through the logic gates, the signal output result will have a delay.
Even though the delay is so short since the unit in nano scale or nano seco... |
H: How do generation schedules / load schedules work on a power grid?
I've noticed that some generating stations have "generation schedules" and similar schedules also exist for load distribution stations. They usually have a MW amount telemetered to the ISO (grid operator) for each operating hour. How do they determi... |
H: Help understanding current sense application note to inject feedback into buck converter
I am trying to understand this application note using MAX4173H to inject feedback into a MAX1692 step-down converter.
How to they determine the precise point at which the current limit will kick in, is it the point at which the... |
H: Choosing the right opamp for a charge sensitive pre-amplifier circuit?
I am preparing to build a charge sensitive pre-amp for use with a gas filled proportional counter. Here is an (idealized) schematic for a CSP:
But in all my reading they are referencing idealized opamps. Broadly speaking, what opamps make good ... |
H: What do you test when changing parts
Let's say some parts within one of your products are discontinued. You already have a replacement that seems to fit from specifications. What tests do you usually conduct to verify proper operation? Long time test over temperature? Just a few test routines on the desktop?
I am c... |
H: Unused pins of FMBA14
I am using NPN Darlington array FMBA14. I am only using B1,C1 and E1 pins for my application. The other pins B2,C2 and E2 can be left floating?.
Can someone suggest anything on this?
Thank you
AI: The datasheet explicitly says that it's a multichip component so they are literally two separate ... |
H: Explanation a line in SPI Realisation in C: receive data
I have googled how SPI in C could be implemented and found a tutorial, where there is the following line:
#define SpiPs_RecvByte(BaseAddress) (u8)XSpiPs_In32((BaseAddress) + XSPIPS_RXD_OFFSET)
I am a beginner and have no idea what this line does. Could someo... |
H: Why do input power calculations for this power supply not match?
According to the specifications of this Mean Well LRS-150F-12, PSU (12 V, 12.5 A) its output power Pout is 150 W.
I want to estimate the input rated power Pin at rated output.
Efficiency is given as 87.5%. So this makes Pin = 100 * Pout / 87.5
So Pin ... |
H: Can LED work as pull-down for BOOT0?
Apologies if this is a silly question. I must be really overworked to not see an answer myself.
In short, I want to free GPIO pin by moving LED to BOOT0 of STM32L4Q5.
According to datasheet BOOT0 automatically switches to analog mode after reset and then it can be used as PH3 GP... |
H: Opto-Isolator FODM 8071 switching noise at output Issue
I am working with Logic Gate Output Optocoupler. I have tried removing 15pF capacitor but it didn't made any difference.
On output port it is generating noise
Any help would be appreciated..!
Thanks in advance
AI: Your schematic is barely legible, but it app... |
H: ATTiny204 accurate delay with correct fuses and F_CPU
So I worked with an ATTiny for the first time today and I was quite different from my regular Arduino / ESP8266 programming.
When testing the Blink script I noticed that the delays weren't correct at all.
I think I understand that I have to set the Clock Frequen... |
H: 5V voltage regulator output voltage
I am using a MC78M05 voltage regulator to supply a microcontroller with 5V from a 7.5V input voltage. When I want to programm the card, the system is not working and there is no 5V supplied by the MC78M05 (the system is off, input regulator=0V). The 5V is supplied by the external... |
H: Sniffing a SPI BUS
I want to sniff some data from a SPI Bus between boards from a loom machine. The bus starts at J9 from PCB 5722 and goes through 8 boards named PCB 5778, which I guess are the slaves. The connector where the BUS starts has 14 pins and some of them are /OUTEN_EXP, SI, CKOUT+, CKOUT-, CEOUT+ and CE... |
H: RJ11/RJ45 power surge protection
I have a case where phone landline is above the ground and when lightning strikes it hard, the internet modem and router gets damaged, including devices connected to it.
I was wondering what would be essential components of some sort of surge protector. I would expect it to look sim... |
H: What is a C1 and A1 chip?
I'm fixing a Playstation 4 and Playstation 5 and I blew off a PS5 chip labeled C1. I managed to use a similar chip from a PS4 but it is labeled A1. What are these chips called and what do the labels mean?
AI: Kind of a blind shot here, but that seems to be a SOD package. So in this case it... |
H: How is a line commutated inverter different from a grid-following inverter?
The U.S. Department of Energy provides this definition of a line commutated inverter:
An inverter that is tied to a power grid or line. The commutation of power (conversion from direct current to alternating current) is controlled by the p... |
H: How to use a battery charger evaluation module as a booster?
I have a power source that can give me around 0.9 ~ 1 V and 900uA. I would like to use the BQ25570 battery charger evaluation module to give an output of 1.8 V. I would like to attach a capacitor to discharge the current at 1.8 V. I looked at the manual, ... |
H: Calculating N-type enhanced MOSFET gain with two different equations brings me a different result?
Hi, take a look at this problem from my notebook. Leave alone the fact that the resistor should actually be 1,111.111, it is not related.
If they claim that VGS=2 and Vs is connected to ground it means that VG = Vin ... |
H: Can I use a SSR to switch on/off an electronic ballast?
It's not appropiate to use a SSR to switch on/off magnetic ballast (used with HID lamps), because it's an inductive load and the Triac inside the SSR cut off while there is still current flowing. That produce flickering.
Can I use an SSR to switch on/off an el... |
H: Is it a good idea to charge multiple Li-Ion batteries using a single buck converter?
I am trying to implement a DIY MPPT into my solar tracker project and I wanted to know if it was possible to charge all of the three li-ion 3.7v batteries in series with just one feedback buck converter; BMS modules charge each cel... |
H: Current flow in full wave bridge rectifier during negative half wave
I was watching a video on full wave bridge rectifiers and was wondering why the current flows in the direction of the green arrow (+ to point C) during the negative half wave, instead of going in the direction of the pink arrow to the resistor?
AI... |
H: Assess Efficiency of Small Switching Power Supply
First of all, I'm a noob. I just like to tinker around. I would like to find how efficient my little 12v/1a switching power supply is (and many others like it).
From some research, it may appear things aren't so simple on the 120v input side. It sounds like power fa... |
H: How to calculate the pulsating current flowing through a shunt resistor?
If the current flowing through the shunt (0.5 ohm) is in pulsating form (PWM with 50% duty cycle and 100 Hz frequency,) how do I calculate power loss through shunt in order to choose proper for application? (Driving a solenoid with pulse and h... |
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