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H: How does the input circuit on this oscilloscope manage to accept such a large range of voltages?
I recently bought this ($45!) oscilloscope: http://www.gabotronics.com/development-boards/xmega-xprotolab.htm. Looking at its schematic, I see the circuitry for one of the two analog input channels:
The website says th... |
H: Altera DE1 Board Read KEY?
I need to press and hold key 1 and than press key 2 to increase value.
How to Read keys only if both keys are pressed. This is what is have which is not working correct. (programming languages vhdl).
if key(0) and key(1) are pessed do somthing
PORT (
KEY : IN STD_LOGIC_VECTOR(3 DOWNTO 0)... |
H: Suggestions for DC/DC converters with digital control
I am under quite some time pressure and I need to put together a document about how several DC/DC converters (preferably buck) with digital control compare to each other. I am pretty clueless, I have already pored over tons of datasheets, but I got little useful... |
H: Issues with resistor heating, for an LED?
I am direly confused on this. I've used 220 Ohm resistors in the past for all of my LEDs (at least that I can remember), however nothing on my arduino+breadboard with a few leds on the 5V breadboard rail had worked.
I finally looked at the data sheet for the LEDs from the o... |
H: What does it mean when multimeter accuracy is marked as: ±0,03%+10Digit?
I have a digital multimeter and its accuracy for VDC is marked like this:
±0,03%+10Digit
This multimeter has maximum display of 80000. So in the 80 V range it can show for example 79.999V.
0.03% of 80V is 0.024V - that is clear for me. But ... |
H: TVS Diode Layout
I have two DB37 connectors on my board which ultimately connect to a CPLD. All of these connections/signals are inputs to the device.
To protect from ESD I am using TVS Diodes ESD9C3.3ST5G. I have the board like so:
DB37 -> Diodes -> Pullup resistor -> CPLD.
The 1K pullups are for a different purpo... |
H: Why do you need 2 resistors when hooking up a transistor as a switch
What is the point of R2 in the following diagram:
I get that R1 controls the current to the Base, but what does R2 do?
AI: The R2 resistor is used to bring the voltage on the base into a known state. Basically when you turn the whatever source of... |
H: Open Source version of MOST?
Is there an open source version of the MOST protocol?
From the above link:
MOST (Media Oriented Systems Transport) is a high-speed multimedia network technology optimized by the automotive industry. It can be used for applications inside or outside the car.
The serial MOST bus uses a... |
H: What is this component (labelled L1)?
What is this component? It looks a bit like a capacitor, but not exactly, and it is labelled L1 on a small circuit board where there are capacitors labelled C2 and C3…
AI: An inductor.
Essentially a coil of wire round a ferrite core.
Here's one without the heatshrink around it: |
H: Please help identify this diode
This is a part from a (severely amateurish) Piezoelectric transducer amplifier circuit. I
am looking to identify this diode so that I can find a datasheet for it as well as possibly purchase more.
The original circuit PCB is shown below. I have drawn a schematic of the board (also b... |
H: Copper PCB traces not connected?
I'm still really new to electronics. I'm trying to get used to reading PCBs and what not. I just got a new multimeter and I wanted to test it out so I was using the continuity test on the board's copper traces. But what's really weird is it was saying that a point on the trace isn't... |
H: Is it safe to disassemble an unpowered PC power supply?
Once a typical PC power is unplugged, is there any danger of receiving a shock while disassembling it? Are there typically high voltages stored that one should be aware of?
context: removing a cooling fan from an obsolete but functional power supply before re... |
H: Advice on relay set-up
I'm trying to build a Christmas light show, using a netduino (arduino clone). There are plenty of tutorials on the web, however they always lends themselves to US power supplies. Could someone please recommend to me the best way to switch a 10A 240V power suppy (x8 for different lights) via t... |
H: Brushless motor specs to maximize stall torque
I'm interested in a brushless motor having a high stall torque (not much in RPM).
What specifications of a BL motor would give a fair indication of its stall torque, provided that
voltage is fixed ( 12V )
current is also fixed ( say 10A max )
I'd like to identify qui... |
H: npn transistor base current question
Hi i am new to using transistors for signal amplification.
Can someone explain to me how to figure out the amount of current being drawn into the base of the transistor when it is in the common emitter configuration. ( see link below for circuit diagram).
I would also like to kn... |
H: How do I make a real-world verison of this LC circuit?
I'm trying to build the LC oscillator show on the bottom of this page for some school project and I'm having a bit of problems translating the theoretical circuit into a real-world one.
Here's the schematic:
I think I get how the circuit works on paper. We ha... |
H: What are the advantages of using FPGAs over TTL in intro computer architecture?
I teach the one and only computer architecture course at a liberal arts college. The course is required for the computer science major and minor. We do not have computer engineering, electrical engineering, other hardware courses, etc... |
H: How to work with Dot Matrix LCDs?
I am new to LCDs and I am trying to interface my LCD (used in Nokia 3310 cell phone) with PC via Parallel port. I searched on Google and I found many programs and schematics which can used to draw image on it. But I want to understand the actual functions of the pins of LCD named a... |
H: Arduino software serial - full duplex
I need two serial ports for this Atmega328 Arduino project, but this processor has only one hardware UART. The processor, hardware design, and programming environment are already set, and I cannot change the hardware or processor at all, so a software solution is required.
The... |
H: How does the gain factor adjustment on this current sense board affect the output voltage range?
I'm looking at buying this simple current sensing board: http://www.sparkfun.com/products/8883. Here is its schematic: http://www.sparkfun.com/datasheets/Sensors/ACS712%20Low%20Current%20Sensor%20Board%20v12.pdf.
The cu... |
H: Guidelines for sizing solar-powered electronics?
Does anyone know of sizing guidelines or calculators for solar powering electronics? i.e. given power consumption, latitude and allowing for bad weather, accumulated dust and bird poop etc, calculate the size of solar cell and amount of storage to ensure that the ele... |
H: Why can my oscilloscope measure all frequencies equally well?
I've got an oscilloscope that, according to the manual, looks like this (for AC):
---Cac--+-----+--------
| |
Uin Cin Rin Udisp
| |
--------+-----+--------
Uin is the voltage input, Udisp is the voltage shown by the os... |
H: How do I know if which leg is the emitter or the collector? (Transistor)
I'm new to electronics and here's a newbie question that I would like to ask:
How do I know if which leg is the emitter or the collector in a Transistor (For both PNP and NPN) using only an analog multimeter?
AI: This really works in practice.... |
H: Is it true that power transformer has maximum efficiency at full load?
Is it true that power transformer has maximum efficiency at full load? In other words, is that possible practically?
AI: All transformers are going to put out at least somewhat less power than is put in. In other words, there is no such thing a... |
H: VHDL increase decrease integer value
I have create project witch has an "counter" counter = Integer. I need to increase/decrease an integer value by pressing the buttons. the progress has 2 entitys, entity 1 should increase
the value and entity 2 should decrease the value, Im not allow to do so with component how ... |
H: In a BJ-Transistor, why do we need to bias the junctions?
I'm new to electronics and I'm kinda confused about transistors.
In a bipolar junction transistor, why do we need to forward bias the emitter-base
and reverse bias the collector-base?
AI: You don't need to forward bias the B-E junction. Whether you do depen... |
H: Connecting X10 to Arduino
I'm trying to setup some DIY home automation, and I've run into a bit of a roadblock. I am attempting to wire an Arduino Uno into a RJ-11 cable in order to connect to a TW523 two-way X10 controller as shown here: http://www.arduino.cc/en/Tutorial/X10. They provide a diagram to connect th... |
H: Arduino Sketch Compile Error: Trying to Concatenate Float with String
I am not sure if I should be posting this here or on Stackoverflow, but since this audience likely has the most experience with Arduino, I figured this would be the best place.
I just bought an Ethernet shield, and as a first project with it, I'm... |
H: Harmful to NPN transistor if collector circuit is broken?
Is there any harm to having a conventional switch that can open the circuit between the collector and +V with an NPN transistor? While the base is still being excited by a pin of my controller?
I am using a simple circuit to allow a micro controller to switc... |
H: How do I tell if a transistor is bad?
I have just had a frustrating experience with an NPN transistor that came from a pack of 15 "switching transistors" from Radio Shack. The specs on the packaging say "Typical hfe: 200" but when I measure and calculate the values from an actual operating circuit it looks like the... |
H: How do I make the turn off and turn on time equal in a NPN transistor?
I have a simple NPN switch, see the diagram.
I feed a 100KHz square wave (TTL) to the base of this transistor and it turns on very very fast (a few nSec) but it doesn't turn off as fast, it almost takes 2uSec for it to turn off. (I am looking a... |
H: How will this Verilog line be synthesized?
How will this Verilog line be synthesized?
data = (s == 0) ? bus0 : 16’hz
The problem is that if I use mux/buffer it won't put Z if s!=0 because the output of the mux/buf is x (undefined) if the input is z.
AI: I'll assume you're working in an FPGA. If you're tal... |
H: UART signal distortion with AVR
While evaluating the Libelium Waspmote board for wireless sensor networks, we discovered a strange communication problem.
We tried to set up a link between the waspmote and another board via UART at 115200 Baud using 8N1.
This is the resulting waveform on Tx for sending 9 times 0x55... |
H: How to work with FTDI V2DIP1-48?
Could someone please direct me how to interface with this chip? I am a total newbie in electronics, and after buying this chip, well, i have absolutely no idea how to connect it.
The chip has an USB port, so i was sure that it needs to be connected through it to a PC (perhaps with s... |
H: How do I wire a motor driver power supply?
I'm trying to wire and control TB6612FNG Dual Motor Driver Carrier, but am doing something wrong. Why is the motor not running?
I have the vcc and gnd connected to a 5v power source, and ao1 and ao2 connected to my motor.
When connecting the power source directly to the mo... |
H: ATMEGA328P: Can I re-use PB4(MISO) w/ a pull-up resistor w/o interfering w/ SPI?
I have a Freetronics Eleven with their Ethernet Shield and I would like to add a DS2502-E48 to the circuit to provide the hardware MAC address. This nifty little gem from Maxim uses the Dallas 1-wire bus, and if possible I would like ... |
H: Is it worth it learning how to use 7400 series "jelly bean" logic IC's or are they completely obsolete?
My road map for learning electronics included the 7400 series logic chips. I started in on electronics by following the labs in the "Art of Electronics" lab manual which includes labs with these chips. I ended up... |
H: How critical a resistor value for MSP430 spy-bi-wire on reset?
When setting up a circuit for the TI MSP430 - the reset line in all example circuits has a 47k Ohm resistor (R1 below) on it. How critical is that specific value and why that value?
This is what I've currently been using to do this.
Can I use somethi... |
H: How do I define solar irradiance in the context of a solar cell?
This is homework. I've tried my best to find the best answer that I could understand and could be accepted by my lecturer.
I've searched my lecture notes, wiki and google to find some good explanation defining solar irradiance. But somehow I still do... |
H: how to design a power amplifier's layout in l-edit?
i want to design a power amplifier in Tanner L-Edit.
I want to write code in the .ext file but I don't know what syntax or language the .ext file is expecting. Is it spice? I couldn't find a good tutorial.
The second option is to use the Dev-Gen tool but it produ... |
H: Cheap visual indicator for a PA loudspeaker line
I have a PA system which is outputting at most 200Vrms AC peak, around 100Vrms AC nominal, from the transformer. The current is around 4Arms.
Since the system is comprised of 12 output transformers, and the test system puts them all in the same room, I'd need a visua... |
H: Is it safe to run and charge a deep cycle battery in an enclosed space like a bedroom?
I'd like to experiment with running a small server (5.5 watts) / 85AH deep cycle battery / charged via 30 watt solar panel from my bedroom.
I generally keep the window open, but want to make sure it's relatively safe for me to k... |
H: How does one prototype with SMT chips where the layout must be kept tight to avoid parasitic inductance?
Is it necessary to go straight to ordering a professionally made PCBs when one wants to test a surface mount component circuit involving high rates of change of voltage (dv/dt) and current (di/dt)? That is, this... |
H: What can cause this damage to the GPU?
I bought a computer for a person in which, when delivered, the video card (Gigabyte Nvidia GTX 570) never gave output. The only way the display got basic VESA output was when I moved the card into in the PCIe 8x slot (was on PCIe 16x) but of course blue screen on drivers insta... |
H: Why use a resistor when blocking DC?
This may be a silly question, but I was wondering about the resistor involvement of a DC blocking network employed at frequencies 5MHz to 2400MHz.
Most of the designs I have seen are an RC arrangement:
----||-----
|
R
///
Now the RC combination I know devel... |
H: How do I test a circuit without an oscilloscope?
Just what the title says; I'm playing with simple beginner circuits, signal amplifiers and stuff. Without fancy laboratory equipment such as an oscilloscope, how should I test the output signal is amplified ?
AI: An Oscilloscope and multimeter is standard for electro... |
H: What happens when reaching the max temperature on a temperature sensor?
I need to monitor the temperature of a hot plate so it stays at 210C
I am just using a Arduino and lcd to display the temp using a DS18S20 (I have it ready but not actually using it to measure the plate with this) but that's only rated to 100C ... |
H: What's so revolutional in Broadcom BCM20730 Bluetooth chip that's everywhere in the news?
Trade magazines are full of reports about Broadcom BCM20730 Bluetooth chip that is expected to have power consumption so low that devices will work for years of a single battery set. Here is their press release.
I don't get it... |
H: Is Atmega8L-8PU compatible with Atmega 328 on arduino UNO?
I have an arduino UNO running my code perfectly. Now I want run the same code on an Atmega8L-8PU which is connected on a breadboard. Is it perfectly reliable to use this Atmega8 instead of the Atmega328 (if the compiled code is less than 8kb)? Also please t... |
H: MMC/SD card interface - any access to wear levelling info? (counters, etc)
I don't suppose there's something in the MMC/SD card specification for retrieving any information on erase counts on an MMC/SD card, is there?
My goal is to get my embedded system to avoid writing to metadata like last access or modified tim... |
H: Connecting to Netgear 3500L serial terminal interface - using ft232rl
I managed to lock myself out of my router. I think it must the firewall rules I changed. I can now only connect to it via serial terminal. On the website it says I need a 3,3v ttl serial cable. According to the tutorial it's self powered so I onl... |
H: How can I attenuate any signal to 5V peak-peak?
How can I attenuate any signal to 5V peak to peak?
I tried the following design :
While I limited the output to 5V peak-peak, the circuit clipped the output to 5V instead of attenuating it.
My main problem is that I don't know the input signal's amplitude. I don'... |
H: How do I get the name or number of device?
In many cases when I am designing a circuit, I use transistors, ICs, etc, by using calculations. But when I go to the market I have to ask the product by its name which I don't know. How do I get the name of device,I am looking for? Is there any simple way? Or I have to me... |
H: Why can an oscilloscope only find frequencies 1/10 of the sampling frequency, despite Nyquist?
The oscilloscope at my university states both its sampling frequency and the maximum frequency that it can detect. However, the maximum frequency is just 1/10 of the sampling frequency! Nyquist's theorem states that all f... |
H: what is the color code of cables in earphones?
What I see after stripping the cable is this:
copper-red and yellow on right channel
green and stripped red-gren on left
Whose are for ground and whose for signal ?
(edit: I'm asking this for ep-630 but the question I intend is more generic, first to all creative headp... |
H: How do I facilitate keeping multiple grounds, (i.e. AGND, DGND, etc...) separated in the layout when using Eagle?
I've designed several PCBs where I needed to keep the ground returns of different parts of the circuit separated, i.e. analog, digital and high power. I use Cadsoft Eagle for schematic capture and layou... |
H: Xbee module works for 10 seconds
I am trying to communicate between 2 arduinos using 2 xbee shields. I am trying to configure the Xbee shield with PAN ID, address etc. I am using X-CTU utility on a windows 7 64 bit operating system. I am able to configure one of the XBee modules with all the necessary parameters. I... |
H: From a toggle to an impulsion
I'm trying to make a circuit (with no programmable circuits, only logic gates, flip flops and latches) that outputs a short impulsion each time it's input toggles from 0 to 1. Do you have any idea of how to do so?
AI: Please try to use normal english. I'm guessing "impulsion" is suppo... |
H: Where does GPS interference such as that from Lightsquared come from?
A recent government test shows LightSquared products affected 75% of GPS receivers on adjacent frequency bands. Is this most likely because (a) the Lightsquared transmitters bleed over onto the wrong frequency, (b) because the GPS receivers recei... |
H: Does wiring a multi-cell battery pack to provide two different voltages adversely affect cell lifetimes?
A robot-arm kit I am playing with uses 4xD-cell batteries wired in series to provide 6V, with an additional connection on the cross-bar at the end of the pack to provide 3V. This seems reasonable enough, but I w... |
H: Shouldn't these headphone wires be insulated?
My headphones sometimes don't put out sound in one of the channels, so I opened them up and this question came to mind:
Shouldn't the 3 copper cables that connect to the mini-jack be insulated? One seems to be pure copper, I'm not sure how they changed the color of the ... |
H: How do I build a bracelet that vibrates once every n minutes?
I intend to establish a few new personal habits that eventually become second-nature to me. To assist myself, I want to wear a bracelet that vibrates every, say, 5 minutes all throughout the day as a constant reminder to keep up whatever new habits I'm t... |
H: XST Verilog - Casting real to integer constants
When I try to synthesize the following Verilog code using Xilinx XST, I get the error, "Unsupported real constant". If I try wrapping that expression in an $rtoi function, XST gives a different error: "Unsupported System Function Call".
Using the Xilinx synthesis too... |
H: Interrupt Service Routines and I2c together
I would like to ask a question that has been on my head for a while
I have done coding small ISR's for pic and AVR controllers and i have successfully tested them on board.And i have just learned some days ago that you need to keep ISR short.
So I have this ISR that run... |
H: RF proximity sensor around a perimeter
I'm trying to build a proximity sensor that triggers on nearness of the sensor to a perimeter antenna, sort of like an underground invisible fence. I want to feed that input into a microcontroller which will respond when it approaches the perimeter. Most of what I'm finding ... |
H: Input voltage of LM317 drops when lead acid battery is connected on output
I have built a voltage regular circuit with LM317. Its input is connected to my solar panel.
As in many circuit examples, there is a voltage divider to bias the adjust pin. Also, I have connected a diode on output to prevent backward current... |
H: Should I Remove the Power When Unplugging Components From an Arduino?
When I am done with a circuit and want to build another, should I remove power from the Arduino or can I just remove the unnecessary parts and start plugging in the necessary parts?
AI: It is best to remove power while re-wiring a circuit, so, ye... |
H: AP1509 DC-DC Power Supply calculating Inductance?
I'm working on an embedded system which I want to enable USB Host on for a few devices. As I'm supplying USB Devices with current and am not sure of my own on board current requirements I decided I'd aim high and go for the Diodes INC AP1509 which can supply up to 2... |
H: dsPIC 30F6012A will not read RD9, appears to be software problem
I'm using a dsPIC 30F6012A. I have two PCBs with this chip, both displaying the same symptoms, implying it's not one-off damage. RD9 is definitely being driven to five volts, confirmed with a multimeter. Older versions of my firmware read digital inpu... |
H: Cannot get a digital square wave on oscilloscope from the GPIO of the Raspberry Pi?
ENVIRONMENT:
Running "Raspbian" on Model_B Raspberry Pi (Revision 2) w/ ribbon expanding the GPIO out onto a Breadboard as shown in the following image.
SETUP
Here is a close up of the GPIO setup on the breadboard and the connecti... |
H: Number of machine cycles in microprocessor 8085
The DCR instruction in MP 8085 has has 1 machine cycle, i.e. opcode fetch cycle. But the DCR M instruction has 3 machine cycles. What are those three machine cycles?
AI: The \$3\$ machine cycles are:
Opcode Fetch Cycle
Memory Read Cycle
Memory Write Cycle
Internall... |
H: Help me understand the pinout of this 21" LED display driver
I am trying to connect a 21" LED Display driver's input pins to my power board. There is a datasheet also but it doesn't have the input pin diagram. Therefore, I have got the below attached input pin diagram from the Chinese manufacturer.
The things that ... |
H: Using Battery (li-ion) with higher capacity
Just got portable radio Ambient Weather WR-111B. It is using CR123A 3.7V/800 mAh rechargeable lithium ion battery.
On ebay I see CR123A 3.7V for a different capacity than 800mAh: 1200mAh or 2200mAh.
My question: is it safe to use for this radio (or any other hardware) a b... |
H: System response types
Whenever I am given a system type with a certain transfer function, I am always asked to proceed to find out the 1. impulse response and 2. step response of the system. My question is, what is so special about these two response types that other responses, like for example parabolic response, ... |
H: What is the point of a small mark on a DIP IC opposite the pin 1 indicator?
I have seen an unusual mark on an IC. Can anyone tell me does it have any functional or testing significance?
AI: Perhaps this image would help.
As you can see the metal pressing to connect the pins to the chip have a central bar that is ... |
H: Why use IEEE 802.15.4 over WiFi?
I am researching about the deployment of sensors within smart cities;
If I was to place an sensor unit on a row of street lamps, then have a main street 'router' that allows these sensors to upload data via 3G/LTE/Cabled/WiFi connection - why would I implement a IEEE 802.15.4 (ZigBe... |
H: Have I damaged this DC-DC converter?
I bought this DC-DC Adjustable Power Converter Module, to convert 12V DC to 5V DC.
Initially it was working fine, but I connected IN- and OUT- pins to the each other and used it as a common ground for LED Display driver which takes both 12V and 5V as input but has one ground. A... |
H: Provide full specifications of the given IC?
I have searched a lot in the internet about this IC, but I didn't get any answers. The markings are:
9903AJ
DM74LS94N
AI: DM74LS94N is obviously some variant of the famous 7400 series logic ICs.
Therefore I'd google for
"74LS94 data sheet"
"74LS94N data sheet"
"7494... |
H: Are opamps as a voltage regulator effcient?
If I setup an opamp in a non-inverting configuration as follows:
Vrail+ is 7.5V, Vrail- is GND (0 V)
Vin is 2.5V,
Vout = 3.3V (in other words, the gain, aka, 1+R2/R1 is 1.32 [V/V])
Iout = 100mA (connected to some load)
What are the source of my losses? How efficient are... |
H: Energy meter design/mcp390x
I am considering the mcp390Xa series for a energy meter project. What I am not understanding here is where the voltage part of the watt calculation is happening. Is this up to the micro to measure voltage and apply it to the output pulses? When used it a non micro situation, is it ass... |
H: Computer line-in voltmeter
I'm about to make a voltmeter from computer line-in. In some strange way I can not see direct current from computer. Why does it work only with alternating current? What information does captured wave contain? Could someone please explain basic principles of how does line-in work? How doe... |
H: Reading noise from allan variance plot for MEMS sensor per IEEE Std 952-1997
I am following the Standard Sensor Performance Parameters from the "MemsIndustryGroup" to test some Gyroscopes:
I conducted a test and plotted the square root of AVAR (Allan Deviation) against Time per IEEE Std 952-1997 using MATLAB:
I a... |
H: Advice Needed On Removing Stubborn Circuit
I'm new to soldering and I've done some research on what I need in terms of material and tools and what I need to do in terms of removing and replacing a circuit. The circuit I'm replacing is a Laptop (ASUS g53sw) power jack. This component has 5 connections onto the circu... |
H: Is it possible to use a digital pressure sensor with a ATtiny4313?
I have a pressure sensor as follows, tested and works great with the Arduino Uno:
Output is digital through SCL/SDA.....
Will I be able to use this directly with the ATtiny4313 coding with Arduino language? On the Arduino Uno it's a piece of cake t... |
H: Building a small 4-bit adder on a breadboard
I am very new to using IC and basically a breadboard in general, but I am doing a project on how computers add and thought it would be nice to have a practical demonstration.
My main question is, for the parts that I am going to list out, would a 5 volt input be ok? What... |
H: Routing traces for GPS antenna input
I'm trying to integrate a breakout board circuit from SparkFun into my own design. It uses an external coax antenna with a SMA connector. I've brought their circuit over in its entirety, and from a hookup standpoint, it's identical. I'm worried about routing the antenna input to... |
H: Reversing a Photoresistor
I'm a total newbie at this, but I have a photoresistor set up so that it controls the shorting on an audio circuit. When light is on, it shorts and cuts the sound. When it is dark, it closes and allows the circuit to run normally. How can I reverse this so that light will make the sensor c... |
H: PC internal piezoelectric vs magnetic-driven speaker
Do magnetic-driven speakers provide better "quality" (more frequencies) than piezo speakers?
Do they consume power even when not in use?
AI: Piezoelectric speakers do not have a very flat frequency response, which makes them less than ideal for reproducing the au... |
H: Controlling a Link Sprite camera through an AVR - how to get the data to a PC?
I have a Link Sprite camera through which I intend to take image captures and store them into an EEPROM. Later, I want to extract the data from the EEPROM and display the image on a PC. What are my options here?
I imagine UART is require... |
H: pic33f UART Problems
I've been tearing my hair out at this for a while.
I have a dsPIC33FJ16GS502 and I've been trying to get it to transmit a single character to my computer but so far, I have been getting absolute garbage:
The uC should be sending 'b' instead of 0x89. I have a gist of my code available here.
I ... |
H: Understanding Current Draw
I have a DC- adapter which gives me the output of 12V and 3.3A, I want to connect it to a device which requires 12V and a few hundred milli amps, would this damage the device? or any device would automatically draw the current it needs and not anymore ?
If it matters the device is a displ... |
H: Powerful electromagnet?
Is it possible to produce over 1000 lb of magnetic force over a distance of 4 inches(0.101 meters), using an electromagnet?
How difficult would it be? Explaining the general spec's of such an electromagnet?
Most importantly,the power input... how much power would this electromagnet need? A... |
H: Radio Transceiver bulkhead connection and Ground
I have a problem regarding mounting of RF transceiver. The main board inside metal cabinet is floating and when I check the antenna SMA bulk connector its outer case has a connection to circuit ground. This would eventually short the chassis ground to the circuit gro... |
H: Why some LM25xx DC-DC adjustable step-up converters have two negative connections (IN- & OUT-) instead of only one ground?
Recently I came across several 4-pin LM25xx DC-DC adjustable power converter modules such as the ones below.
LM2577 Adjustable Step-up Converter Module from Amazon.com
DC-DC adjustable step up... |
H: Voltage divider using capacitors
A test circuit requires to generate 1V (50Hz, sine) using a voltage divider made of capacitors. Simulation of the circuit using two identical ceramics capacitors (±5%) gives half of the input voltage as output, as expected. But on breadboard using signal generator, two identical cap... |
H: What is this tube thing? (Madcatz drum pedal)
Could someone help me out, I have no idea what this tube-like thing is.
This is from a Madcatz Xbox360 drum kit pedal. The pedal stopped working and I opened the it up and found just this tube thing connected to a wire going into a controller via a 2.5mm headphone jack,... |
H: Fully understanding LM386 datasheet minimum parts example
I'd like to fully understand the circuit marked as "Minimum Parts" at page 5 in LM386's datasheet:
Is there any reason for 10k resistance at the input potentiometer or is it just an arbitrary value?
For an audio application, should that be a logarithmic po... |
H: Why should I use a logarithmic pot for audio applications?
Just got really curious about it reading this answer from Spehro Pefhany. There Spehro comments that one should use a logarithmic pot for audio applications. So I googled it.
The best article I could find was one titled "Difference between Audio and Linear ... |
H: What is this white board called?
I am just trying to to figure out what this is called.
What I am referring to in this picture is the white board with all of the connectors and the led light attached. I am trying to purchase one but I have no idea what they are called.
AI: That is a Breadboard. It's hooked up to a... |
H: What is the purpose of this simple 1 capacitor 2 resistor high pass filter?
I have seen the standard high pass filter with the -3dB cutoff frequency = \$ 1/2\pi RC\$.
simulate this circuit – Schematic created using CircuitLab
However I have seen this particular circuit which I'm seeing here and there, especiall... |
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