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H: Using Audio Cable to connect to computer
I have a HB100 Microwave Sensor Module which I am going to use for an experiment, and I want to transfer the data it produces directly onto my computer. Since the output of the device is in the audio frequency range, I want to connect it using an audio cable. But how exactly... |
H: Finding an affordable integrated USB MCU
I'm in the early stages of designing a development board around Cypress Semiconductor's PSoC 3 and 5 range of chips. Much like the Arduino, I'd like the programming experience to be very easy, and that means being able to program it and interface with it without having to bu... |
H: Do you have to set the TRIS register when using open collector outputs on Microchip microcontrollers?
I'm using a dsPIC33FJ series microcontroller from Microchip. It has dedicated open-collector outputs/registers.
I've read the documentation and it is extremely brief. Does setting the ODCx register have precedence ... |
H: Lithium batteries worries
For the last few days I have had this strange fear that an external short circuit would cause an explosive fire of my laptop's Li-ion battery.
Three questions:
Is it true that lithium ion batteries have protections inside, so that an external short circuit would not cause overheating + e... |
H: How to control Arduino frequency?
I'm porting a code from c in the Arduino platform (I'm using an Arduino Leonardo). I wanto to remote control a camera with an IR LED. The info about the remote control want to emulate here. The code, here.
The Burst frequency to drive the IR LED is 32700 Hz, and i'm trying to make ... |
H: 5-pole, double-throw relay
I am working on an electronics project where I need a two way switch,
that can be controlled using an arduino and can be soldered by hand.
I tried to Google for it, but without luck. Does anyone know of such a component?
EDIT: for clarity: I need to switch between two usb lines coming fr... |
H: Need help finding datasheet
I have tried searching multiple sites such as digikey, google, bing, even wikipedia for the data sheets of the following Items but can not find them
these components are from a seagate barracuda.
Diodes (Most likely TVS Diodes)
Capacitor (I think)
AI: Those look like short code numbers... |
H: Easiest way to make printing head spray ink?
If I have a free-standing printing head including ink tanks, what would I have to do to just make it spray some ink? Are there some standardized signal encodings or something?
I'm not talking about generating an "output" with a moving head. Just a free head that should s... |
H: Aren't UBEC's just packaged voltage regulators?
I'm working on a project where non-trivial currents (theoretical peak ~6A) are needed at several different voltages. Since this is battery-powered, I initially started looking at finding an appropriate switching voltage regulator. After looking into a couple different... |
H: Arduino as Modbus client with MAX485 doesn't get any response
I'm having some troubles trying to query a Modbus server with an Arduino through RS485.
I've already succeeded in querying a software Modbus server running on my PC through the USB/COM port using the ModbusMaster libray, hence it shouldn't be a software ... |
H: AC and DC Resistance
I have a few questions regarding my task of calculating AC and DC resistances:
If a cylindrical conductor is made of two different materials, would the conductor's effective resistance be the parallel combination of two resistors? Or do I just add up both resistances that each material provide... |
H: Why would you attach a Diode to the base of a BJT?
I was looking at a DC BJT setup for sourcing current and came accross this
I have never seen a diode attached to the base of BJTs before and was wondering what it might be used for? I believe it might be used for compensation due to effects in temperature, but I h... |
H: Using Ethernet Bus
While reading about the Ethernet protocol, I noticed that it has bus features like collision resolution. I've only ever seen Ethernet networks using a star topology (a bunch of PCs connected to a switch) or point to point (the switch connected to a router).
Can you connect office equipment with ... |
H: What exactly are the differences between a USB host and device
Came across some doubts:
What exactly are the differences between a USB host and device? Is it just that who powers the bus?
When two devices connect how the device say "hey I will be the host and you be the device?"
Can one device acts as a host as we... |
H: Did I use this optocoupler correctly?
I'm planning on using this optocoupler in a PCB I'm making. I've never used one before so I want to make sure I'm doing this correctly and got the right numbers off the data sheet.
The image below is a simplified version of how I set it up. If I read the data sheet correctly ... |
H: Why is ISE / XLS is mapping a signal to the global clock GCK0?
I've synthesized a design for a Coolrunner II CPLD. I intend to use the CPLD's internal clock. I have an input named CLK. I look at the fitter report and I see this:
** Global Control Resources **
GCK GSR GTS DGE
Used/Tot ... |
H: Single Phase fan induction motor current flow
I have dissemble a induction motor in a fan. It look like follows.
I have no expereince in this field. When I tried to understand it's current
flow, I got these questions.
What is the main winding and the auxiliary winding ?
I guessed inner winding is the auxiliary win... |
H: Speed control of a DC motor using variac
I have a offset printing machine and it's original electrical design uses a
variac device to control it's speed (RPM) value of the main motor drive.
I don't have access to any electrical wiring diagram, so I need to find it's typical
wiring diagram from variac device to mot... |
H: Repeating the same interrupt in AVR
Suppose, AVR microcontroller is handling an interrupt. Interrupts disabled. At this time the same interrupt occurs. Will microcontroller handle the interrupt again after return from the first handler?
If "yes", then how can I avoid this? (I want to use INT0 interrupt (on low-leve... |
H: Could I replace a diode with a BJT in a pinch?
I'm trying to learn the device physics of these transistors. If I were out of diodes and really needed one to complete my circuit, could I just replace the diode with the emitter and base of a BJT? Or is the idea that BJTs are made of diode junctions just an analogy.
A... |
H: How to fix my designed calculator circuit using Logisim
I am trying to design a calculator circuit that adds 2 four-bit 2's-complement binary numbers as its input and outputs an 8-bit 2's-complement number when the control bits equal 01.
Here's what I have done so far using a software called Logisim. I am really st... |
H: TTL RS-232 current limiting
I'm making software UART (TTL levels) on ATtiny85. Need I connect current-limiting resistor to output (TX) port? If "yes", what value should I use?
I plan to connect my device to a UART-USB converter (on PL2303, FT232, etc.).
AI: No, you can connect the ATmega directly to the FT232 etc.
... |
H: How does this LM386 circuit boost bass?
I'm just starting out in Electrical Engineering and was wondering if anyone could clarify a question about the following RC circuit regarding the LM386.
My question is about the following circuit:
How has adding such a small value cap (between pins 1 and 5) in parallel to th... |
H: What is the cheapest way of producing audible sounds?
I am in need of producing an audible sounds in my circuit, when instructed by a microcontroller which it is attached to. So far, the cheapest way I have found is to use a piezoelectric style buzzer, but want to know if there are even cheaper alternatives.
I need... |
H: Automating button presses
I'm working on a project which involves automating the pressing of some buttons on a device. There are five push buttons, which are quite stiff and require fast repetitive presses - around about ~7Hz with 50% duty cycle. I also have one toggle switch that needs to be switched at a rate of ... |
H: Question about trace length matching patterns for high speed signals
A colleague and I had a discussion and a disagreement about the different ways high speed signals can be length-matched. We were going with an example of a DDR3 layout.
All the signals in the picture below are DDR3 data signals, so they are very... |
H: Suitable small/fast EEPROM for Atmega328
Looking for recommendation on EEPROM chip, which I can connect to Atmega328. The requirements are:
at least 5-10Kbyte
fast reading with Atmega. I expect reading one word about 1-5us, please advise if it's possible.
I am going to store set of custom data structures and rea... |
H: Encoding delay of Ethernet and the relation to cable frequency rating
I asked a question here called "Speed of electricity (signal propagation?) through copper for communications delay". I wanted to know how long does it take a signal to travel down a length of Cat5e cable (my background is telecomms and networking... |
H: AC Voltage source terminal polarity and grounding
Ill try to make it as clear as possible. This may seem like a simple question, but it is something that I havent quite figured out. It has to do with polarity on the leads of an AC source. Every book I read, pictures an AC source with two leads such as this:
Now, o... |
H: Reliable secondary storage for Raspberry Pi (or other such single-board computers (SBCs))?
Most SD cards have a fairly limited life (as in maximum number of read-write cycles), and in spite of wear-levelling, for relatively frequent disk update applications, would probably fail in a year or so, with reducing effect... |
H: How can I get my atmega328 to run for a year on batteries?
Scenario
I have created a nice electronic door lock for my dorm room. It is currently an Arduino Diecimila with a servo [un]locking the door. It has a numerical keypad with 3x4 buttons and 5 LED's (2 serie pairs and one single LED). It also currently runs o... |
H: Should I look for Aluminum or plastic enclosure for UPS
I am on the process of material selection for the UPS I am prototyping. My plan is to manufacture a product that should finally go to the market. I am relatively new to the manufacturing and I would like to get some advice on the selection of the right enclos... |
H: Speaking words with Pololu 3pi Robot
At each instersection I play different music for the compass direction the robot decided to go. Any ideas how to get the robot to speak the words "West", "East", "South", "North"?
if (current_direction == 'W')
OrangutanBuzzer::play("!T240 L8 a gafaeada");
if... |
H: Voltage divider ambiguity
considering the following circuit :
R1
|--/\/\/\--------- A
| |
|+ |
(E1) |
| |
|------/\/\/\----|
| R2
|
|------/\/\/\---- B
R3
Can anyone please explain to me why th... |
H: Class AB or Class D for a home theater amplifier
I am planing to assemble a 5.1 channel amplifier. I selected the famous TDA2030 as the basic element and is simple to proceed. But I have a confusion, whether to use some other Class D amplifier for better quality.
Please share your experience about these classes of... |
H: Robot power supply
I'm designing a power supply for a small robot. I will use a 6V NiMH battery pack and I want to deliver 9V at 2A to drive the motors. I will use a step-up regulator to reach 9V but I don't know how to deliver 2A. Can anyone give me some hints about what should I study to project this circuit?
AI:... |
H: How will transformer efficiency change if the transformer is connected backwards?
Suppose I have a transformer designed to convert 220 volts into 5 volts and when it works in this mode being 95% loaded its efficiency is 97%. Now I connect the secondary winding to a 5 volts power source and connect appropriate 220 v... |
H: Class AB power amplifier
I have implemented a class AB amplifier. The schematics are below.
As you can see, my \$V_{cc}\$ is only 1V. How come I can still suppy 2.8 amp to the 4 ohm speaker/load? Is it a bug in MultiSim, or did the input signal (16V pk AC) made its way to the speaker? As far as I know, the voltage... |
H: Debugging a PIC16 with MPLAB X
I am having problems with the MPLAB X debugger (although the release build works fine). It behaves very weirdly with my PIC16LF1937-based PICKIT3. Specifically:
It gets caught in random infinite loops
The step over function doesn't work most of the time
It only seems to debug the fir... |
H: Zener diode forward voltage
I'm trying to learn how Zener diodes work and I think I get the overall concept (regulating voltage to the zener voltage level), but there's one thing I don't understand. I'm looking at this diode and see that it's zener voltage is 3.3V, but it's max forward voltage is 0.9V.
Why is th... |
H: Difference between a Power Plane and a Copper Fill?
What is the (or is there a) practical difference between designating a layer of a printed circuit board as a power plane as compared making a polygon cover the layer and naming it the same as the power net? I'm thinking of EAGLE when I ask this question, but I thi... |
H: Laptop Adaptor Circuit Elements
Can you tell me about this circuit elements' name more specifically? Especially number 1 and 10; what are they?
Number 1 text: SCC 068K275V-X2 MPXGMF 40/100/21
AI: I'll bite:
X2 capacitor
Inductor
Fuse
Metal oxide varistor
Rectifier
Capacitor
Diode
Capacitor
Capacitor
Transformer... |
H: What happens to the electrons of semiconductors?
Take for instance, a diode. It has a region of n type material and a region of p type material. The p type material has a lack of electrons, the n type has an excess of electrons. When it's forward polarized, current will flow through the junction, etc...
This is a ... |
H: Step voltage up or step voltage down when using batteries?
When using batteries to drive a load via a voltage regulator, is it better to step the voltage up from two batteries in parallel, or step the voltage down from two batteries in series? If there is no absolute answer, is there a general rule (or set of rules... |
H: Voltage Regulator Issue (TI TLV70012)
I'm using this 1.2 V voltage regulator and having some serious problems.
Currently have +5 V going to EN and IN pins and GND is connected to GND, seeing ~1.6 V on OUT pin when connecting it to GND through 8k resistor.
I have been trying to figure out why the regulator is not ou... |
H: Why is there alternating current in my wall socket?
Why is the standard of delivering electricity to our homes is via alternating current, and not direct? As far as I know almost every electronic device has an AC»DC converter because their internals use direct current.
AI: From Wiki:
Transmission loss
The advantag... |
H: How does current flow through a voltage source?
Im going back to electricity 101 to understand several things Im missing. One of them is exactly how does current flow through a DC source.
Heres my understanding: A voltage source is one which has an excess of electrons in one side of its terminals, and a lack of ele... |
H: Comparators Dragging Each Other Down
I've assembled a circuit which uses RC timing compared to the voltage across a potentiometer. It is intended to run the motor in this fashion:
ON ----------------------- -----------------------
| |
OFF -----
by triggeri... |
H: How do I control speed using servo.h?
I have an Arduino mega 2560 attached to a 4 wheeled robot (similar to this: http://www.youtube.com/watch?v=gPqZQsKHJ9s&feature=related) .
Pin 9 on the Arduino is connected to the front wheels of the robot to move either left or right.
Pin 10 on the Arduino is connected to t... |
H: Connect TSOP to prolifc serial
I have a prolifc USB to serial cable that I want to use to recieve infrared signals coming from a TSOP Sensor
I saw it is possible to connect a classic rs232 connector with TSOP here.
How can I connect it without damaging something ?
AI: You most probably can't do that. The standard s... |
H: Why do mobile phone transmissions come in pulses?
We are all familiar with the phenomenon that mobile phones induce in amplifiers and loudspeakers. The bip bip-da-bip bip-da-bip which happens just before you get a call, or if the phone is just feeling chatty.
I understand how the sound is produced, I don't understa... |
H: Why do most RFiD tags use hexadecimal numbers?
RFID tags store one 24-digit hexadecimal number.
Why use a single 24-digit hexadecimal number?
AI: They don't. They store a number which is internally represented as binary and transmitted as binary. There is no hexadecimal here.
Humans have a hard time grasping numb... |
H: Don't have a momentary switch, what else can I use?
Hi everyone and apologies if this is a really dumb question.
I'm following this to control the GPIO on a raspberry PI:
I bought a starter kit which has 2 mini push buttons, but I've no idea if they can be used?
If not there's nowhere round here I can buy a swi... |
H: How to keep the arduino uno up on serial connections?
Each time I open a Serial connection to my arduino it restarts.
Is there a way to unactivate this ?
Cheers.
AI: The reason for the reset is that Arduino Uno boards use the DTR signal line as a reset input, for automatic "rebooting" of the board for loading fresh... |
H: I2C - Where's the ACK
I'm working on I2C master driver for interfacing a particular peripheral.
The problem I have, is that when the 9th clock arrives, the slave device doesn't pull down the SDA line.
I checked the signals with a scope, and everything looks like fine. the address is fine.
I'm not using external pul... |
H: Peak detector is not working when voltage is changed
I am trying to design a peak detector in Multisim simulation tool. I have designed buffered peak detector to get peak voltage of sine signal. The designed circuit is working when signal voltage is constant, for example when signal voltage changes from 1V to 0.5V ... |
H: Finding a proper Book or a Internet Source on Combinational Logic
I am having trouble finding a book on Combinational Logic. For those who do not know what Combinational Logic is, that area of study talks about digital logic such as six logic gates(and, or, xor, not, etc) along with ALU, Multiplexer, full adders an... |
H: What lamps are out there that don't flicker and give off warm light (like incandescent)?
In the past few years several countries stopped producing 100W incandescent lamps, and in a few years they may disappear to be succeeded by fluorescent lamps. I really don't like the flicker and the color most common fluorescen... |
H: I need to sense if a rope has been touched, what is a safe way to do this?
I was thinking of attaching a sensor to the rope but there are so many types I'm not sure which one to use.
Pizeoelectric, rolling ball, vibration, tilt and tension sensors could all work.
I need the lowest cost, most durable solution. Anyon... |
H: Interface a LCD to RS232
Is it possible to connect this LCD display. Directly to the PC serial port using a prolific usb 2 serial converter ?
AI: If the prolific usb to serial converter outputs "TTL-level" signals (that is Transistor-Transistor Logic) and not rs-232 levels, then yes.
Looking around for the prolific... |
H: Which books should I read to gather practical and useful electronic design skills?
I need some guideance from the experienced users here, I need to know where to focus my studies:
Ive been reading several electronic books, and they are quite different, I decided I want to re-learn from scratch most about semicondu... |
H: Why is the negative contact in a battery bay always the side with some sort of spring?
Is this just purely convention, or is there some kind of technical reason behind it?
AI: Assuming you're talking about round-type (cylindrical) batteries, such as D, AA and AAA, it's to ensure maximum contact with the flat end of... |
H: Dropping voltage for red channel on RGB LED
I'm looking at a Multicomp OSW-8349 RGB LED, which has a Vf of 3V min / 4V max for the green and blue channels, and a Vf of 1.8V min to 2.8V max for the red channel, at 350mA. I'm planning on regulating 3.3V to drive the green and blue channels, but would like to avoid us... |
H: 50 volts regulated power supply
What is the best way to make a 50 volts regulated power supply? I was thinking to incorporate the LM78xx IC only to find out the maximum voltage they support is around 24 V and 1 amperes. Another possible solution is to stack/cascade Zener diodes until the equivalent voltage is aroun... |
H: Fast opto-isolation with open collector output without VCC
I have a two wire communication channel, with a data line and a ground line, with the data line being pulled high via a resistor on the receiving end. I am supposed to send information on this line by connecting the data line to the ground. There are also o... |
H: Can't set to Fast PWM OCRA mode
Trying to have Fast PWM mode when TOP == ORCA.
Works fine with OCA toggle (measuring correct frequency), but doesn't work in non-inverting mode.
cli();
// Fast PWM Mode
TCCR2A = 0;
TCCR2A |= _BV(WGM20) | _BV(WGM21) | _BV(COM2A0) | _BV(COM2A1); // Inverting mode fails
//TCCR2A |= ... |
H: 10A power suply, high frequency
An EL wire consume ~10mA/m, and need a 1800Hz, close to main voltage, sinusoid supply. (The noise is not a matter as the EL wire itself will cut off the frequency >2kHz).
for an installation I would like to power 1km of wire. Therefore I would need a 10A supply to power in order to d... |
H: "low current", "high efficiency", "high intensity" LED's
"low current"
"high efficiency"
"high intensity"
... ?
I read these terms in various places and every single time the LED's are just used as a signaling LED in a small circuit, requiring only a few milliamps to light up.
What is the difference? Or is it jus... |
H: Options of Button Labeling
I've made a few electronic devices, and most of them had buttons or switches, but I had to rely on my memory to remember which button did what.
What kind of hardware options are out there for labeling switches and buttons other than masking tape and ink pen? Do they make switches with te... |
H: rotary switch / turn knob? how to call it?
Im looking for a switch-like rotary knob, that i can turn left and right. Its outputs a simple 'pulse'. You find these in selecting/setting numbers on assorted electronics. You can keep turning them (both directions), there is no absolute '0' point. But i need to know, if... |
H: What potentiometer should I choose?
I want to create a sound amplifier with the LM386 and I need a potentiometer. I don't have a clue what I'm doing (:P) but I've printed out the datasheet (for the LM386) and had a look at it.
So I need a potentiometer, with a knob since I'm going to create a casing for it all :)
... |
H: Multiple clients listening the UART TX line
I'm building a DMX device and am thinking about paralleling the workload amongst several microcontrollers. The device has to support 24 PWM channels and I'm afraid, I won't be able to service all 24 channels (software bit angle modulated) in one atmega MCU. Is it possible... |
H: Does calibration involve fixing electronics or mechanical part?
My question is not 100% related to electronics design but it might be because I don't know the answer.
I'm writing a simple research on anemometer calibration. The thing is all the resources I found are explaining the procedure as measurement setup and... |
H: Giving device variable input/setting capabilities
I am working on a device which allows the user to set a certain variable value. So instead of turning something on or off, the user can set a value at some point on a continuum. For example, suppose I have a microcontroller that blinks an LED every x number of secon... |
H: pre amplifier voltage clipping
the input voltage is from mp3 player.
Now, why is that when the input voltage is around 5 mv pk, there are no clipping issues but if we change the input voltage to around 400 mv pk(which is common in every mp3 player including mobile phones), there is severe clipping as described belo... |
H: How to properly set up a multimeter to measure the power consumption of a computer?
From what I understand, a multimeter can be used to measure the resistance in in a circuit. Multiplied by the voltage, measured in the same circuit, I would get the total power consumption. Is this correct?
I want to use an inexpen... |
H: Driving P-MOSFET with Netduino
I've read quite a lot of threads here about P-MOSFETS and how to drive them properly from IC but still have some questions.
Here's the schematic:
Some useful values from MOSFET datasheet
Vgs(th) -2..-4 V
Rds(on) ~0.07 Ohm
C ~1.5 nF
Schematic will be used to control a lot of common-an... |
H: Switching speakers between multiple audio sources
I have a xbox and a PC, and I want to connect them both to the same speaker set (Logitech 2.1).
Guessing I need a switch and found this one.
But I have no clue if it's any good for audio (regarding the contact rating). Could anyone comment if this is a good switch? ... |
H: Role of current source in comparator
I have this schematic of a quarter of the internals of an LM339 from this site
I want to know what the purpose of the four current sources are in this circuit, and how might they be implemented?
I know current sources can be implemented as the following;
op-amps (not useful to... |
H: Using a TLC5940 to control LEDs with different forward voltages
I am trying to build an LED matrix (64x32) of RGB LEDs using a TLC5940 current sink LED driver.
The forward voltages of the LED components for each RGB LED are:
R: 1.8V
G: 2.8V
B: 2.8V
The driver maintains a specified current which helps because I ca... |
H: Inaccuracy of a RS-232 baudrate
I write a simple software implementation of UART for my ATtiny. My CPU isn't fast, so I should choose low baudrate. Nevertheless I want to use as high baudrate as possible. And I can estimate the inaccuracy of a baudrate in the my implementation.
What is the maximum possible relative... |
H: How to amplify MCU port output?
Having the following diagram, how can I amplify output from pin 3&4 to speaker, using BC547 transistor?
(source: elm-chan.org)
AI: Based on the comments and responses, your requirement seems to be:
Create a 2-bit DAC using 2 digital outputs of the ATTiny45
Produce an audio-frequen... |
H: Calculating run time for a device with variable current draw
I recently built a small microcontroller-based project for a friend that consumed different amounts of current at different times. I wanted to calculate the run time for a given battery type (but discovered the area of my brain that used to know algebra s... |
H: LED current limiting resistor and Ohm's Law
Yesterday I was trying to figure out how many ohms of resistor should I be using for my LED, and found this post right here in the forum.
The formula states that one should subtract the voltage drop of the LED from Vcc, and then divide it by the target current (A), in the... |
H: 4 Digit LED Display usage
I have a 4 digit LED display that I would like to integrate into my project, but only has 12 total pins when there are 4 digits. I am a beginner so I do not know how or which pins to power in order to display the required digits. Here are a few images of the LED Display. The number on the ... |
H: Data transfer between FFs in a CPU
I was in computer organization lecture and when we wrote what the CPU does during an add instruction (like micro instructions) something got me thinking.
I didn't understand how we let one of the FFs output to the internal bus and tell other FF to latch the data in. If we send the... |
H: Can I half the current rating when moving from 100-240V to just 230V?
I am repairing a failed ATX computer power supply (PSU). It is rated 100-240V 9A input, 620W max output. Its 10 A bridge rectifier is dead, and I am able to get at most 8 A bridge rectifier as a replacement. 8 A is not 10 A, of course, but I live... |
H: What are these on power supply cables?
Possible Duplicate:
Name of this component
I've noticed that on many home electronics there are sometimes power supplies that have a bulky unit attached to the cable. I don't even know what these are called to be able to search for them.
What are these called?
What purpose ... |
H: avrdude -B 3 parameter
I'm new to AVR programming, I got this atmega8A chip and I use avrdude with a USBasp that I made myself, for programming it.
For some reason the chip won't answer if I don't use the -B 3 parameter with avrdude, although I have reset the chip's fuse bits to factory defaults.
Now my question i... |
H: Quartus II: Pin incompatible with a bank it is not on
I am using the pin planner of Quartus II to place my I/O signals on my Cyclone IV pins. I am stuck on the following fitter error:
Error (169029): Pin adc0_in[0] is incompatible with I/O bank 3. Pin
uses I/O standard LVDS, which has a VCCIO requirement incomp... |
H: DMX512 Remote controlled LED
I'm having a problem with this circuit. I am trying to get an LED wash light circuit to be remote controlled via DMX512. The problem is, after I designed the circuit for the RS485 (which will deliver the DMX signal to my LED circuit) my professor told me that there's no time to make it ... |
H: amplifier quality waveform for different transistors
I have tested two transistors in multisim, the first is the default(more of generic) and the second is the 2N3904
here is the first picture with default transistor in placed
and here is the corresponding waveform
as you can see, its smooth, but if we use the 2N... |
H: Use USB as an on-off switch
I'm looking for a way to build a zero(ish) cost intervalometer for my Canon SLR using only stuff that I have or can get very cheaply (my budget is about $4). I've already managed to "build" a wired remote for the camera, which is basically two wires connected to the ground and shutter re... |
H: How to inflate/deflate to create artificial lungs
I'm trying to create lungs for a project I'm working on that can inflate and deflate. I'm quite new to EE and using the Arduino, so I don't have much experience to know what would be the best way to mimick lungs.
I saw this video and wanted to do something almost id... |
H: signal clipped despite q point is middle
Why is that the output signal is clipped despite the fact that the transistor's q point is located halfway of Vcc???
here is the schematic
and clipping here
From my analysis, as you can see, supply Vcc is around 40 volts and the multimeter reading of the collector voltage i... |
H: Multiple xbees on same network
I have been looking at xbees recently but can't seem to find a tutorial on configuring and programming for 3 xbees on the same network - 1 to act as a master the other 2 respond as slaves, but the slaves will do separate functions such as one could be a device for turning on a light t... |
H: Arduino: why does Serial.println(int, HEX) display 4 bytes?
An int is 2 bytes but Serial.print with HEX or BIN formatting outputs 4 bytes:
int x = 0x9876;
Serial.println(x, HEX);
// output is FFFF9876
Why?
(and what is a good way to print out only 2 bytes)
AI: The Arduino print / println function casts the i... |
H: Lower Vcc of power amplifier and still provides 30 watts
The above circuit is a power amplifier delivering roughly 30 watts (11.7V times 2.9A) in the 4 ohm load (assuming its a speaker). When we look at \$V_{cc}\$, it looks huge when compared to electronics books providing only 9, 12 \$V_{cc}\$. Can we lower the \... |
H: RS232 to UCB using cp2102 chip
Long times ago I bought on the ebay a cheap rs232->usb converter, today I wanted to use but I realized that I don't have the pinout. This is the converter how can I figure it out the pinouts, does anybody has experience with this?
AI: Since USB does not have negative voltages, I think... |
H: State Machine using Case getting unexpected result
I am trying to write a very simple state machine that implements a combinational lock.
The code is: Switch1 -> Switch2 -> Switch3 -> Switch4
I realize that it is Switch 7, 6, 5, 4 accordingly in the code.
If it is not done in that order then it gives the error(inc... |
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