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H: Charging appliances with chargers of different amperage (safety & duration)
Safety
Will the battery or charger be damaged if I use a 1A charger to charge a 2.1A appliance?
Will the battery or charger be damaged if I use a 2.1A charger to charge a 1A appliance?
Duration
I have tried both of the above. What I notice ... |
H: Jack barrel contact diagram?
I've come across this diagram, I researched a bit, but I don't get what this contact is supposed to do. The circuit below is an audio effect, and I'm confused because it apparently doesn't mean that it will power the circuit when the Jack is connected?
What are your thoughts? Help is re... |
H: What is the name of the following cable?
Instead of wrapping cables I will like to make the connection by using the following type of cable:
what is the name of the female and male cable with this circular end? I will like to buy this type of cable so that I can connect and disconnect cables in an easier way. With... |
H: Inductor held with hands
I have a fairly simple problem, but as I am a newbie in electrical circuits I was hoping someone might help me understand the principles of things.
I have a circuit with an inductor of L = 0,102H a resistor of 20k ohms and a voltage source of 10V. The question is how much current will 'acc... |
H: About ADC's 'No missing code'
Some 16 bit ADC's specifications has "No missing code: 14 bits min", like ADI's AD7656. I want to know where the 14 bits locate in the 16 bits. Does it mean the high 14 bits?
According to the definition of 'No missing code', the missed code can be one or more of the possible 2^n binary... |
H: What is the use of transistor in the input side in TTL logic family?
Second transistor will turn ON and OFF if input voltage is directly connected to its base terminal. Then why a coupling transistor is used at the input side of a TTL logic gate?
AI: Because with it you don't have to worry about the amount of curr... |
H: AVR TIMER0 treating with prescaler and without to blink a led
I am playing with ATMEGA168A's TIMER0. CPU is running at 20MHz and there are two treatments.
a) Blink a LED at 20ms frequency by using a 1024 prescaler. In that case i count the the times that an overflow occurs for the frequency that prescaler of 1024 ... |
H: Do serially connected diodes share equal reverse voltage?
If I place three cheap 200 V rated diodes across a 500 V supply instead of one expensive diode, is the system guarantied to work correctly?
My worry is the situation at which two of the diodes share 150 V and the remaining 350 V appears on the other diode, b... |
H: Correct use of diodes in car stereo
Could I check my use of diodes in the following circuit?
I'm wiring a new car stereo head unit into my motorhome (RV).
I'm going to use most of the standard radio harness connections. However I would like to run the 12V power from the leisure battery so we can listen to the radi... |
H: What is the drawback of a high-value resistor for positive comparator feedback / hysteresis?
I'm building a simple circuit which has an LM211 comparator at its heart. The positive input is connected to a 10k-10k resistor divider across the supplies, stabilized by a 1uF capacitor. Hysteresis is provided by 1.8MOhm f... |
H: How to "push buttons" on voltage ladder?
I have a quite simple task I can't wrap my head around. I have an old home 5.1 sound system with optical input that plays sounds from my media center. Its remote broke, and while I tried to fix it, I understood how much I hate having one more remote on my desk.
I'd like an m... |
H: XMega bootloader - How to make use of the functions in assembly source file
Its been two days I'm trying to write a Bootloader for ATXMega32E5. The Atmel studio doesn't have boot.h header file supporting XMega.
As a result of searching and googling, I found two ASM header sp_driver.S and sp_driver.h. Even after the... |
H: Turn 9V device off using 3.3V logic level signal
i'm facing the problem to turn a 9V (battery) powered device OFF using the output of a 3.3V based microcontroller. To do this i already threw together the following circuit (which works - assuming i drew it correctly...) EDIT: oops, the pulldown resistor R5 should o... |
H: How long does analog to digital conversion take?
I am analyzing Voltage signals from many channels which have passed through a multiplexer for analog to digital conversion, before reaching the computer. I am wondering how long the conversion takes, and whether there is a correction applied i.e. interpolation of the... |
H: Area under Dirac Delta function
What is the difference of the area calculation for the Dirac delta function when using different limits of integration?
$$\int_{-\infty}^{\infty}\delta(x)dx = 1$$
but
$$\int_{-\infty}^{t}\delta(x)dx = u(t)$$
AI: When integrating to only \$t\$ there are two cases: if \$t < 0\$ then t... |
H: What was the crysistor?
I'm reading through Jim Williams' "Analog Circuit Design: Art, Science and Personalities", and a mysterious component called a crysistor is mentioned. There are a few clues in the text, like the fact that it was a superconducting magnetic memory that "showed promise of revolutionizing the co... |
H: Can I put 2 voltage regulators (5V) in parallel to dissipate the heat better?
I connected around 10m of christmas light LEDs to a 5V voltage regulator (lm7805). It gets quite hot, put I can still touch it without burning my finger. So in is within its temperature range (120 C max). It's a self regulating voltage re... |
H: Identifying two 6 pin SMD packages
I need some help identifying these 2 SMD parts. One says .3Ft and the other says .1Ft. They each have 6 pins.
They are found on a DCC decoder for model trains.
AI: Sometimes googling SOT23 and the marking works!
This time it got close enough to identify the package as a SOT363.
A... |
H: Where to simulate and test Microprocessor designs?
I'm reading book on computer architecture by Patterson and Hennessy. Now I'm much interested in designing a real-time working microprocessor. But i didn't have any idea where to start from! I started to learn VHDL so suggest me something from where i can design pro... |
H: Finding equivalent capacitance
How do you find capacitance when the switch is closed, and how do you find it when it's not? Our professor just skipped this. You would help a lot of people!
simulate this circuit – Schematic created using CircuitLab
AI: Here's how the topology morphs: |
H: I'd like to improve this design to support ICSP
I'm new to electronics and this is my first circuit. I have some questions about implementing ICSP in this design. This is a bit of a long post with quite a few questions so I'll apologize in advance for its length. Unfortunately I don't have a mentor who I can pin... |
H: How to toggle a reset in a counter made up of JK flip flops
I have been playing around with a small circuit which at the moment consists only of a counter made up of 3 JK flip flops. Like so:
What I want to add is a reset input pin that will set the 3 LEDs to 0/off but I am not sure how to implement. I know that y... |
H: Using diodes to mix 2 audio signals into one set of speakers
I have the audio output of 2 computers connected to only one set of speakers.
Each computer uses one of these external USB sound cards:
And I use this splitter cable to wire the signals together:
The whole thing works, but with some minor problems:
Th... |
H: Arduino controlling high voltage DC source, Opto-Isolator
I need to create a circuit that I can use an Arduino to control a 400~500 DC voltage source.
I am not used to opto-isolators, but I was thinking about using it to separate both systems. But I cant seem to find one that can handle 500V DC in the Vcc port.
My ... |
H: Why does Ethernet on UTP have much greater range than other modern protocols?
OCuLink, SATA, USB 3, and Displayport all provide on the order of a few Gbps per signaling pair, and are limited to a cable length of just a couple meters. Ethernet via comparable cabling provides comparable speed, but 50 times the length... |
H: Finding equivalent capacitance part II
Here's part I!
They helped me a lot. But this problem is harder so if you can tell me where, if, I went wrong.
When first switch is closed, the other one's opened. And in reverse.
Here's solution one.
Here's solution two.
P.S. Series come before parallel, right?
AI: Neither of... |
H: What is Vcc-2 referring to in the Texas Instruments Tech Sheet for the SN74AS138?
Total noob here.
The tech sheet can be found here: http://www.ti.com/lit/ds/symlink/sn74as138.pdf
In the VOH parameter for the SN74AS138 on page 5, it states that it's MIN is VCC-2.
What does that mean? What is referring to? Is it ... |
H: How can I achieve symmetrical analogue low-pass filtering?
I am experimenting with VCFs for an analogue music synthesiser. Initially I tried a 3-stage low-pass filter based on the sinewave-generator circuit in the LM13700 datasheet but having removed the oscillator, as per schematic below:
I find that its effect o... |
H: What to do with unused pin?
I am designing the Vishay VCNL4010 proximity sensor into one of my PCBs. This sensor has an interrupt pin that I don't need to use. Is it OK to just leave this pin floating ("unconnected"), or will this cause problems somehow?
AI: Normally I'd say it won't be a problem: it's an output pi... |
H: Why is there a separate Floating Point Units in some micro controllers
I would like to know why there is a separate FPU peripheral in some high end micro-controllers even if the small end 8 bit controllers can perform float calculations on their own.
I tried experimenting with a float division on a pic 18 controlle... |
H: Does this linear current source driver deliver constant current?
I was reading on LED driver designs, and I have a question about the linear current source driver. In the circuit below, will D1 ever turn off when there is too much current through R2? In other words, will D1 turn off when Q1 turn on?
Because the bas... |
H: How can RS-232 DTR / RTS pins be used for power?
I want to interface to this device where (sec 4.2) states
can be powered from the DTR and RTS handshaking lines by having one
high and one low
Also, Wikipedia states:
No method is specified for sending power to a device. While a small
amount of current can be ... |
H: What do the terms "cuts" and "jumpers" mean?
specifically, with respect to the electrical grid.
Here's an excerpt from something that I'm reading that I don't understand:
Switching operations, including applying cuts and jumpers, can be operated in ganged (all phases in one operation) or un-ganged (one or more se... |
H: Can I just connect two CR2032 batteries in parallel?
I'm designing a device with a small current draw that will mostly sleep in a very low power mode and I need to use button cell batteries due to a limited thickness. I would like to double time between batteries needed to be replaced by using two or more CR2032 ba... |
H: What's the difference between CC2564 and CC2564MODN bluetooth TI chips?
As per title,
what's the actual difference between these two chips?
I dug extensively the TI site but I cannot find such info..
AI: The CC2564 is Bluetooth 4.0 compliant. The CC2564MODN is Bluetooth 4.1 compliant.
... Fully Compliant with the... |
H: Fastest time a PIC can set and clear a pin
What is the fastest time a microcontroller (PIC16 in this case) can be set and cleared? It is defined by the frequency, but I don't know the formula to calculate the fastest time that a single pin can be set and cleared.
Assuming the frequency (XTAL) is 20MHz, and there ar... |
H: Will solder usually connect copper vias on a 2-sided PCB?
I've seen videos where the board is suspended in a solution with an applied voltage to plate the vias, but I don't really have the resources to do that. Is soldering parts a reliable method to ensure a connection on both sides of a double-sided board? Some... |
H: Metal connector case connection when using a plastic housing
I'm designing a board with 2 SFP connectors and I am not sure what I should connect the cage pins to. The manufacturer recommends connecting the case pins to chassis ground but my product is in a plastic housing.
I read this article but it assumes a meta... |
H: Total voltage towards load?
What would be the resulting voltage in a DC circuit like this:
Where there are three voltage sources, it seems that two are in parallel(20V,5V)
opposing 15V source So would the total voltage be (20V + 5V - 15V?)
Here is the similar circuit but with a load that is at 2 Ohms:
V1 + V2 are... |
H: Why can't analog video be compressed like digital video (example inside)?
I'm learning the basics of analog and digital TV signals and I came across
this (original link, now gone) short article (see the next page as well).
Why can't analog video signals be compressed in a similar way to digital signals when using... |
H: Same Priority Interrupt on ARM Cortex M0
I have two two interrupts of the same priority; each has its own interrupt service routine: ISR_A and ISR_B.
When interrupt A occurs, ISR_A executes... what happens if interrupt B occurs while ISR_A is executing? Will ISR_B execute after ISR_A has finished? or will ISR_B ne... |
H: Does modelsim support shift right arithmetic in verilog?
I am using ModelSim PE Student Edition, and I am trying to write a module which shifts right arithmetic. After searching online, and consulting a Verilog textbook, I found to shift right arithmetic I can use the ">>>" operator. However when I attempt to do so... |
H: ATmega128 output compare normal mode. Generating a waveform with ISR
So here are specifications:
-prescaler of 8
-Channel A
-pulse_width is determined by user defined degrees (converted to clock ticks)
-pulse_period is 40000 clock ticks (20ms)
-Normal mode
-Timer3
So we have a move_servo(unsigned degrees) where all... |
H: I keep coming across the term "bubble pushing in logic gates."
Can anyone please simply explain to me what it is? A simple little lesson or answer would be appreciated.
AI: Bubble Pushing(or Bubble-to-bubble convention/ Bubble Matching)
I'm not sure if this what you are referring to, but that's what googling 'bubb... |
H: How can I use a greater USB charge current without device enumeration?
I'm designing a device with USB communications, using an STM32F105 microcontroller. It has a LiPo battery, which charges from the USB port using an LTC4077 charge controller. It will generally use a high-current charging port to charge the bat... |
H: Charge a Lipo battery and power a circuit
I purchased this LiPo charger and I plan to connect the GND and BAT connections to the battery and an external circuit at the same time.
In the datasheet the reference drawings are for battery charging only but there is a part that says:
The MCP73831 is designed to operate... |
H: USB - Tolerable voltage drop
For a system I am designing I need go over 500mA limit for a very short time (30mSec). I have designed my system such that during the over 500mA period I am able to sustain my circuits using internal caps. (Internal caps can maintain voltage for my operation). However on the bench using... |
H: Tie Arduino - ATMEGA328P reset pin directly to +5V?
I would like to know if it's okay to tie the reset pin on an ATMEGA328P directly to +5V without using a resistor to avoid random resets and lower part count. If it's not okay, can you explain why it's not good practice?
Thank you for your help.
AI: Application not... |
H: EMF transmission from cell phone's battery
According to Cell Phones & Wi-Fi―Are Children, Fetuses and Fertility at Risk?
While one can put the phone in ‘airplane mode,’ which disconnects it from Wi-Fi and the Internet, the cell phone still emits magnetic fields from the battery, shown to have equally important bio... |
H: LED strips: 46% resistive losses?
I recently bought these LED strips. They are supposed to run on 12V/72W and have 300 x the SMD 5050 LEDs on it.
Schematic:
simulate this circuit – Schematic created using CircuitLab
The voltage values on the schematic have been measured with a multimeter. "560" is written on the ... |
H: Testing an I2S slave device
i have a MEMS mic with digital I2S output. What is the easiest way to test that my microphone communicates right?
No need to verify the sound, i just need to verify on bit level that communication occurs. For example how can i test it with an oscilloscope?
input and outputs are listed:
... |
H: Set function to specific address in PIC18F with the HI-TECH C compiler
I want to put a function in an specific address of memory like PIC C Compiler (#org).
I'm using MPLAB X, HI-TECH compiler and PIC18F4550.
In PIC C compiler:
#org 0x1000, 0x2000
void MyFunction()
{
}
//In other part of code I'll use: asm("goto 0... |
H: Pull up does not work
I got a breadboard with some logic on it. Including it's own power suppply. It is connected to my Arduino Mega 2560 to fill a shiftregister with some bits. Whenevery my arduino is in a undefind state i want the shiftregisters to be dissabled to prevent the hardware from hazards. Undefind means... |
H: Difference between spectral efficiency and bit rate
I am reading articles about error correcting codes, facing to a term "spectral efficiency". Due to the context, I guessed that it means "bit rate", but I wonder are these two terms equivalent or not? I will be thankful if you guide me
AI: I had done some research ... |
H: Output Pin of Burleigh PZ-150 Amplifier Driver Analog High-Voltage Power Supply Unit
I have found a Burleigh PZ-150F Analog Amplifier Driver. However, I could not locate the manual. What connector cables are compatible with the output port of this amplifier? It seems there are two male pins and two female pins.
AI:... |
H: How to interpret complex commands from serial with arduino
In a project involving a serial communication and an Arduino I would like to use the serial interface to run multiple routines on the board.
The idea is to send a unique string with tags and values in order to execute several istructions at the same time. ... |
H: What does a resistor do?
OK, very basic question here.
I read lots of books, searched quite a bit, and every description I read seemed to talk about the flow of electrons and right away go too deep in theory for me to grasp the basic principle of their use.
I understand a resistor limits the "flow", so that an LED ... |
H: Which component cannot handle the higher wattage?
First time posting a question, so hopefully I've stated all the required details.
As the title is not very specific, here is an explanation of my project. I'm making a revised version of the magnetic table lamp, as shown here:
http://www.instructables.com/id/Magnet... |
H: How do I correctly estimate heat output for heater wire
This is based on a problem that came up today. During the course of this problem I realized that I wasn't so sure I understood the relationship between wattage and heat produced.
In the past we did a test in the lab using .305 Ω /ft wire. The jacket is rated ... |
H: What are the units of the output of an ADC?
How would you write or label the output of an analog-to-digital-conversion? I don't seem to have a good grasp for the english when I try to write this out.
counts?
arbitrary units?
For example, if I want to write this out as algebra or label in a chart:
raw signal [au]: ... |
H: May I power atmega32a-pu microcontroller from AA batteries?
I need to provide +-4.5V to the microcontroller. That would be fine by having 4x rechargable batteries, but how is it with current? On each AA battery is written min.2550mAh. I am not sure but I think that max what I can put to the microcontroller is aroun... |
H: 24 volt on microprocessor input pin
I have got my hands on a Intel Edison system on chip. I would like to use it to detect non-zero voltage. For example I have a test point that could be either 0 volt or 24 volt and I want to detect which using the microcontroller.
What ways are there to achieve this? Is a simple v... |
H: How to make Eagle package with dual row surface mount tails?
I'm doing a project using the OMNETICS dual-row connectors (http://www.omnetics.com/neuro/pdffiles/A79025-001.pdf). I'm a bit lost about how to make the package for it in Eagle, as the connector has horizontal surface mount rails that's supposed to solder... |
H: Why do Nintendo 3DS games have 17 pins?
I took a good, hard look at one of my Nintendo 3DS games today, and I realized that there are actually 17 pins on the game that connect with the console. Why? I was under the impression that "everything" needed to be to a power of 2?
AI: Digital Data, based on its nature of b... |
H: General form of a Transfer Function
A professor is writing the general form of a Transfer Function as:
$$H(s)=k\cdot s^{l}\cdot \frac{\prod\limits_{i=1}^{m}\left(1+\frac{s}{z_{i}}\right)}{\prod\limits_{i=1}^{n}\left(1+\frac{s}{p_{i}}\right)}$$
but in every book and in every source that I have found is never mention... |
H: Bi-directional High-side NFET switches -- drains or sources connected together?
TL;DR:
When using two N-FETs to implement a high-side switch should the FETs be arranged so the drains are connected together, or the sources?
Some additional facts about the current design:
1) A boost supply is being used to drive the... |
H: What's the relationship between samples and bits?
I was talking to a friend today that I have a transmitter which is capable of sending 128 samples/second. Note that each sample is a voltage level represented by a floating point decimal. He then insisted that I call it a 7 bit system since 128 is 2^7.
What useful ... |
H: Background functionality of a mobile phone
I'm asking this question out of curiosity. In general, we have around 6 to 7 radios in a smartphone. the modulation schemes, estimation procedures, synchronization methods are different for each radio. How do the people who develop a smartphone, fit all these radios on to ... |
H: ATmega8 LED blinking project not working properly
I am making a simple project using ATmega8 microchip. I uploaded this code to the AVR:
#include avr/io.h
#include util/delay.h
int main(void) {
DDRD = 0b10000000;
DDRD = 0b01000000;
while(1) {
PORTD = 0b10000000;
_delay_ms(100);
... |
H: Is it possible for a VHDL component to have multiple architectures?
Just a thought I had: is it possible for a VHDL component to have multiple architectures if outputs are not modified by both? If so how can we select the one to use at synthesis time (like the C preprocessor)? What happens if multiple architectures... |
H: connector for 25Amps
I am using the OSTT7020150 connector for my board.
This connector has capability to connect wires 10-25AWG which means it can tolerate about 25Amps(from the AWG chart). Now, when designing the board, I have seperate planes for both Vcc and GND. But, my doubt is regarding the drill dia and the... |
H: Finding a DTFT of a signal
I'm trying to figure out what's the DTFT of \$ (-1)^nx[n]\$. (I'm given the DTFT of \$x[n]\$)
So I tried this, but I can't figure out how to proceed from here, if this is even correct.
Any help and advice would be appreciated!
\$F_{DTFT}\{ (-1)^n x[n] \} = \sum\limits_{n=-\infty}^\infty (... |
H: Is accelerometer taking as much power (current) as it needs?
I want to connect accelerometer to an oscilloscope. I have 3x AA rechargable batteries (2550mAh).
I was told that e.g. microcontroller knows how much amps should it take and it wont burn if I connect it to those batteries.
But e.g. LED would burn. What ... |
H: What is the "temperature code" of a soldering tip?
I am looking for a replacement tip similar to the ones below on the picture. On the bottom of my tip there is a number 6 which might be this "temperature code" that I found next to these types of tips on certain sites. I already found out that these are magnetic ti... |
H: Controlling 90 LEDs using one WS2811
I wanted to build a circuit where i would be able to control 90 LED's using one WS2811 and have a total of 60 WS2811.
In this circuit I hope to connect 30 LED's per channel, there is no need for me to control the individual LEDs thus there is no point in me going for the WS2812... |
H: Eagle: Make copper pour connect to entire SMD pad
So I have a design in Eagle with a few SMD components that have pads that should be grounded. I've done a copper pour (draw polygon->name GND->Ratsnest) to create a top ground plane. On some of my components the ground plane connects to the SMD pad, but only by four... |
H: transmission loss with microsd extender
Would a 20-30cm microSD extension cord suffer any kind of noticeable transmission loss? This is a passive extender - literally, a microsd card with wires coming off of it, and a card slot at the other end. Simple ribbon cable connecting the two ends.
EDIT I'm not making this ... |
H: Can't identify component
I was disassembling an old CRT monitor and I came across this component, but I've been unable to identify it. Can somebody help me with it?
It was found in the horizontal deflection circuit, next to the flyback converter.a
AI: That's an inductor, probably made by LG (or at least a clone of ... |
H: Consequences of mixing lead and lead-free alloys when soldering
Would it be a problem to use a lead solder paste to solder lead-free BGA package parts? Are there contamination/compatibility issues? Does it affect the physical connection integrity between the board-component? How about using a lead-free solder paste... |
H: Power supply 5V
I need some help about choosing the best on board switching power supply that has the less electrical noise and longer life time between these schematics for a 5V 200mA board...
Heating is important too!
If any one can come up whit something better I will appreciate it!!!
AI: The 2nd one is a lin... |
H: Why are different currents used for charging batteries with the same voltage output?
I'm trying to understand the behavior of batteries a bit more. I've noticed that chargers for given batteries have different current capabilities. Do batteries need to be charged with a voltage that is near their nominal output? ... |
H: How does someone initially design a digital system for HDL?
So I have really been hitting the example code hard this week in an attempt to better understand some HDL design basics, specifically FPGAs with VHDL. The book I am using (if anyone is interested) is "FPGA PROTOTYPING BY VHDL EXAMPLES" by Pong P. Chu.
Aft... |
H: Finding pulse period for output compare on ATmega128 (10-bit fast PWM)
Ok, so I have ATmega128 board. I have clock of 16MHz with a prescaler of 8 (2MHz). I am using fast 10-bit PWM to generate a waveform with a top value of 1023.
Given a number, the value put in OCR1A = pulse_period *(number/100).
The wave will b... |
H: Given hardware specs: How do I calculate the data bandwidth [bits/s] of this system?
I'm currently trying to buy a hardware that is supposed to extract your brain waves. In other words, a data transmitter.
I am looking at the hardware spec and I am uncertain as to how I should calculate the data bandwidth i.e. how ... |
H: Implementing F using a demultiplexer and an extra AND gate
Use a 1-to-8 Demultiplexer and an extra AND gate to create the function:
F(x,y,z) = ∑m(1,3,5)
If I were using an OR gate I think this would be trivial, simply put the 1 3 and 5 from the demultiplexer in to an OR gate and have the output... |
H: 1A Voltage Regulator - Maximum or output?
I want to design a circuit that has 12V1A output from a battery. I am using a 12V voltage regulator
Do I want a 12V 3A Regulator or 12V 1A regulator?
If a 12V 1A voltage regulator gives me a better dropout voltage, should I use that?
The current is dependent on what the lo... |
H: Tactile pressure sensor and drift. Reading the datasheet
I am looking at the specs of tactile pressure sensor and I can't understand what this means:
"Drift: <3.3% per logarithmic time scale"
How should I understand this? Does this sensor drifts a lot or this is actual good. I am looking for cheap way for measuring... |
H: SMPS Inductor oversized vs properly sized
I am working on an SMPS for boosting an input voltage to drive a single string of LED's. The input voltage range is from 18 to 32 volts. The output voltage needs to be about 60V and the drive current is around 0.760 Amps. I am working on using the HV9912 as the driver chip.... |
H: Current overlap in Inductive Smoothing?
I have the following circuit implemented in the lab :
And the output was :
Can anyone explain why the current overlaps here ? I can't make sense of this.
AI: The energy stored in the load inductor forces the total current to be nonzero. When the voltage across the two diode... |
H: Buffer circuit explanation
I just saw this question and was wondering how this circuit actually works, since I couldn't really figure it out, I though about asking it.
This is the circuit I am talking about:
Lets label transistors from left to right as: Q1, Q2, Q3, Q4. I dont really know where to start, how to an... |
H: Amperage for Sony SNC-VB630 Camera
I am trying to choose a right DC adapter for SNC-VB630 CCTV Camera but the only specs I could find in the official documentation was 'INPUT 12V DC'. Nothing about amperage. I have a 12V dc adapter with 400mA current at hand and I was wondering if that would suffice. How can I find... |
H: libmodbus trouble with reading from server
I have the following code for connection to a temperature sensor as my server using the libmodbus library in C,
#include <stdio.h>
#include <stdlib.h>
#include <modbus.h>
#include <errno.h>
int main()
{
struct timeval old_response_timeout;
struct timeval response_timeo... |
H: Does the output of JK Flip Flop toggle continously?
As given in most of the texts and online resources, the JK flip-flop requires a clock signal with an edge detector circuit so that the flip flop will be sensitive to the inputs only when the clock signal undergoes transition from low to high(Positive edge triggeri... |
H: GOTO a specific address in HI-TECH C Compiler PIC18F
I'm trying to jump to a specific address in HI-TECH compiler and the address is given dynamically.
I tried using asm() function but it looks like the argument must be a constant char[]. Is there another solution to jump to an address using goto or another functio... |
H: Eagle: Remove some text of a component label
I routed a small board that will get connected to a BeagleBone Black using two 8x2 pin header connectors.
As you can see on the picture there's two labels that are drawn out of the board layout so when I upload the board on OshPark the board is bigger that what it shoul... |
H: What is the best and simple circuit diagram for a radio receiver to receive radio waves in Citizen's Band
I am building a two way radio system using the citizen's band in India.
The transmitter is using a 555 timer IC clocked at a frequency between 26.957-27.383MHz to transmit AM waves.
Can you please suggest a pos... |
H: RC filter transfer function and gain
For a standard basic RC Filter, the transfer function is as follows:
$$
{ V_{out} \over V_{in} } = H(j\omega) = { 1 \over 1 + j\omega RC }
$$
However, when simulating the circuit, I find the output voltage to equal:
$$
{ V_{out} \over V_{in} } = |H(j\omega)| = \left|{ 1 \over 1... |
H: Manually Drill Vias into PCB
As shown in the photo below, the PCB design was sent for fabrication without the drill data. Is it still possible to drill the via holes so we can save the PCBs?
This is a 2 layer board, most of the traces are on the top, a few are below. Is it practical to send the drill file to a mach... |
H: Will crosstalk be induced if signal running in parrallel to power trace?
I haven't come across any mentions of signals running in parallel with power traces. Everyt mention thus far has been two signals to each other.
If I have a low amplitude signal (sinusoid < 10khz) (10 mil trace), lets just say its 1V, and its... |
H: Can I split a USB cable's male end, add a second male plug, and draw 10V from 2 ports instead of 5V from one port for a single device?
Say I have a device that accepts 10V @ 2A, and I have a wall-wart with two USB plugs that both output 5V @ 2A. Can I add a second male connector, connect both connectors to the wall... |
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