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H: What does "process" mean in PVT?
For timing analysers, FPGA operating conditions are sometimes know as "PVT", which stands for "Process, Voltage and Temperature".
While voltage and temperature are self explanatory, what does process mean in the context of FPGA operating conditions?
AI: "Process" in this case refers... |
H: USB micro B receptacle has 6 mounting tabs. How many do I actually need to ground?
This USB micro B has 6 mounting tabs. If I ground none or only 1 of them, will it ruin the signal? There is a pad for the signal ground that is separate from the mounting tabs.
Fyi USB 2.0 has a max signal rate of 400 Mbps, and an e... |
H: Are all voltage reference ICs able to sink as well as source current?
I'm looking at the REF30xx series of precision voltage references from TI. The datasheet lists a maximum output current of 25mA. Every specification and figure on the datasheet (e.g. load regulation on pages 3 and 5) shows only positive output ... |
H: Possible to reliably run USB over a non-standard USB cable?
I'm planning on building a device for my car that sits somewhere in the rain tray or behind the dashboard. It will use automotive connectors so that things are sealed, easily connected and disconnected, etc. I plan on having it be controllable/configurab... |
H: Identify a cylinder or thick washer for bolts
It must be obvious to you but I can't figure out the name of that part which I need to replace. It's added to the bolts that hold the PCB to the case so as to create a large enough gap between the two. It's basically a metal cylinder.
AI: I've heard them called standoff... |
H: Initial experiments with an oscilloscope
So I finally have access to an oscilloscope, after wanting to use one for a very long time.
Now that I am in university, I can use the lab equipment. So my first question is, what should I do with this new found resource?
Are there any experiments which you all suggest I sho... |
H: Voltage Controlled Oscillators
I want to know how to calculate the gain of a VCO. I've looked online and see that there exists a formula
$$K_{VCO} = \dfrac{f_1-f_2}{V_1-V_2}$$
but it would seem that this result would give outrageously high gain values. For examples, for a VCO operating the MHz region, would it be... |
H: Using an open-collector output from one IC to trigger a level change on the input pin of another IC?
So my problem is simple: I have an IC that provides an output pin to alert you when some condition is met. The output pin is open-collector, high-impedance when active. I want to monitor this output on another IC ... |
H: Is it advisable to stay stick to Arduino IDE?
Is it better to move to AVR studio (or any other better alternative?) over the Arduino IDE. Feel like it's so simple and childish. I need to know the experts idea and choice..
AI: A huge advantage of using e.g. AVR Studio is the ability to use all the libraries made for... |
H: Capsense behind glass
Is it possible to make a capsense sensor that works through a sheet of glass? I have a working capsense sensor on one of these PSoC development boards:
The buttons work fine, but when I put a sheet of glass on top, they don't work. Do I need to bond the buttons to the back of the glass to mak... |
H: "USB is also a serial communication method" is this true?
I'll repeat the title. Is it true that USB is also a serial communication method ? (a bit confused, someone told me @ facebook :D)
AI: Most wired communication nowadyas is serial, and so is USB. Serial just means that bits are transferred one after another i... |
H: 5V-tolerant ARM
We have a legacy 5V system that makes heavy use of analog sensors and various other 5V digital IOs. We're looking at moving to an ARM MCU to bring this design in line with our newer systems which are all Cortex-M3 based. I would prefer to stay with a 5V MCU so I don't lose accuracy on the ADC inputs... |
H: Inverting the logic of the inhibit pin on TI PTR08100W
I'm using this TI PTR08100W switching regulatator, and want to use the inhibit pin to keep it turned off except when I am holding down a switch.
According to the datasheet:
The Inhibit pin is an open-collector/drain-negative logic input that is referenced to G... |
H: Mixed signal PCB layout for PSoC
I am developing a PCB for an analogue sensing application. It uses the internal ADC on a PSoC3. As usual, the application is very space constrained (11mm x 21mm), so I have had to make some compromises in the PCB layout which I would not have done on a larger PCB.
The board is supp... |
H: replacement soldering iron tips?
I have a soldering iron which allows the use of exchange-able tips, however I am unable to get certain tip types for my iron. Can I get a tip designed for a different iron if I match both the wattage rating and barrel size? It's a 50W iron with temperature control.
AI: The answer to... |
H: What is this strange long wire for in a single induction cooking unit?
Tonight I dismantled one of those single induction hobs:
Inside there were two PCBs. The incoming mains was wired to the top left PCB, while the other contained all the low voltage components, plus some more high voltage parts.
There are two w... |
H: Output filters for power supply design
I am trying to develop a design for a power supply. At the output of my design is a diode rectifier with a capacitive filter output. I've been told that I should expect to see an ESR of zero or something along those lines in my frequency response, but I'm not quite sure what t... |
H: Are capacitors and inductors capable of absorbing positive power?
A resistor is capable of absorbing positive power.
Why wouldn't this be true for capacitors and inductors?
AI: An ideal resistor dissipates (converts into heat) electrical power. They are not capable of delivering power. Capacitors and inductors both... |
H: L298 H-Bridge not working
I have an L298 H-Bridge, but I cannot, for the life of me, get it to work.
I have connected Vss to +5v, GND to ground, Input 2 to +5v, Enable A to +5v, Input 1 to ground, Vs to +5v, Output 2 to a motor terminal, Output 1 to the other motor terminal, and Current Sensing A to ground. The mot... |
H: How to feed laptop + bulb with solar energy?
I reside in Kathmandu where the current power supply is so weak one has to face between 8 to 18 h power cut per day. In order to work, I need to have continuous supply of energy for my laptop and a bulb a night.
I have looked into this Q&A already and found some answers,... |
H: Voltage/Amperage load rating
I'm a newbie when it comes to electricity, and this has been bugging me since like 9th grade when I first learned about V/I/R/P combinations, and to this day I still can't wrap my head around the concept.
I understand about the mathematical formulas, but what I'm having trouble with is ... |
H: AC, DC, what else?
Aside from alternating current and direct current we already know, do you still other type of current flow? Also, is it for that type of current flow to exist? or there are only 2 types of current flow in this universe (ac,dc)
AI: In the DC/AC class there's nothing else. The criterion is frequenc... |
H: Importance of constant collector current (BJT)
I was reading these notes and I have a couple of questions.
What is the importance of the constant collector current in varying voltages across collector and emitter? How does it really relate/help amplification?
Also, why don't we want a varying collector current? Wha... |
H: What's passive about the passive sign convention?
I've heard and read about the passive sign convention, but don't really understand its meaning and importance in solving electric circuits. Is this because of conventional current which flows opposite electrons or is it something else?
AI: The passive sign conventi... |
H: Collector current in linear region
We all know that when the transistor is in its linear or active region, collector current does not increase further. At this point, the base collector junction is reverse bias. But how come there is still a collectr current flowing given the fact that the B-C junction is reversed ... |
H: Output Impedance of a Digital Output
In High-Speed Digital Design, Dr. Johnson illustrates an example of calculating the output impedance of an IC (page 48.). He uses VOL of 0.15 V and VOH of 4.32 V (@ Vcc = 4.5 V) with an Io of 4 mA to compute a typical low state output resistance of 37 Ohm and 45 Ohm for the high... |
H: What problems could occur when chaining 40 shift registers?
I'm planning on chaining together 40 x 74HC595 shift registers. The whole chain of 74HC595s will be controlled by a 5 V microcontroller, which will generate the SDI, CLOCK & LATCH signals.
Each shift register and the microcontroller will have its own PCB, ... |
H: Separating the Grounds for 2 Chips
I am working on a design that requires Two Chips - Energy measuring chip (for analogue measurement) and a MCU (for connecting to a communication peripherals, and connected to a PC.) Both Chips is to be powered by a 3.3V DC supply.
But the ground for both chip has to be different. ... |
H: Troubleshooting why ADuM4160's internal regulator gives 5 V instead of 3.3 V
The problem I have with my ADuM4160 circuit is that I'm getting 5 V from VDD2 pin while getting roughly 3.3 V on pin VDD1. Have I blown the chip?
It doesn't make sense for the VDD2 to be the same voltage as what I am feeding to the VBUS pi... |
H: What does "net current" mean?
I am sorry if this sounds to be a silly question. Maybe I am having trouble interpreting the expression in english since it is not my first language.
I would like to know what the expression "net current" means.
Example of usage: "KCL states that no net current can flow into a node".
A... |
H: Comparing A to Kwh, can it be done?
I have read this page: How to convert amps to kilowatts
I often purchase electricity from a supplier to power computing equipment within a data centre. Some sell me 10 amps, some sell me 2.16 kWh.
When they say 10A, they essentially mean I can draw up to 10A of power (at a usual ... |
H: What is meant by relative voltage?
Suppose you have a circuit
,you are told that the voltage at point 2 relative to point 1 is -90V, the voltage across R2 is -30V and V0 is 200V.
What is the meaning of voltage at 2 relative to 1? Does it mean the potential difference between 2 and 1 as in (voltage at point 2) - (... |
H: Multiplexing two 7-Segment displays (Ghosting issues)
I am currently working on a simple scoreboard using two 7 segment displays, a shift register (74HC595N), two PNP transistors (2N3906) and an arduino uno.
Each 7 segment display is common anode, however one display is Blue with a forward voltage of ~3.3V, the oth... |
H: Transmitting pulses via RS485
I will have an IR led / photo transistor based reflective sensor, measuring rotation speed of a wheel, producing pulses using a comparator with hysteresis. The pulses will be counted by micro-controller.
The problem is, the sensor has to be ~20m away from micro-controller and a big in... |
H: Gyro for Arduino
[Background]
I've assembled a quadrocopter and now I'm going to design a flight controller for it, using Arduino. I can not use any of flight controllers, which you can buy in the store, only hand-made. So, I really want to find the EASIEST hardware solution for it.
[/Background]
The only gyro I'v... |
H: USB cable as +5v vcc source
Possible Duplicate:
Powering a breadboard with USB
I was wondering if it is possible to cut open a usb cable, and use its "sub" wires to get its 5v power and gnd.
I am currently doing a digital circuit school project, and would like to power my bread board (protoboard) using the vcc a... |
H: "is not declared" error in Verilog
I created a simple 8-3 encoder module (called encoder8to3) to replace a few repeated instances of Verilog code. I then tried to use the module in levers2.v. I get the following error when I run a Verilog test file:
ERROR:HDLCompiler:69 - "C:/Documents and Settings/me/xilinx
p... |
H: Need a device that can take single input and covert to a keyboard key press on USB
Let me explain what I'm doing currently.
We have made a finger heart rate monitor, each time your heart pulses a transistor is switched on via its base. The collector and emitter of the transistor are then wired to a dismantled USB k... |
H: Is this a good design for MOSFET H-Bridge?
I have been looking around trying to design a simple but working H-Bridge for an RC car motor (12V and 2~3A).
This bridge will be driven from a microcontroller and need to be fast to support PWM. So based on my readings, Power MOSFET are the best choice when it comes to fa... |
H: Why V rms instead of V average?
I'm looking at an equation for average power in a signal
$$
p_{avg} = \frac{1}{R} v_{rms}^2
$$
and wondering why it isn't
$$
p_{avg} = \frac{1}{R} |v|_{avg}^2
$$
AI: Simple: the average of a sine is zero.
Power is proportional to voltage squared:
\$ P = \dfrac{V^2}{R} \$
so to get a... |
H: usb2 specification - is it backwards compatible
Say I had usb port on my motherboard that only supports low speed devices, will full speed/ high speed devices not work on the low speed ports but at a lower speed?
AI: In general, no. There really is no such thing as a low-speed-only host port; it would violate the U... |
H: NTE2013 base inputs
I have an NTE2013 which I want to use with an Arduino. I may be driving the base pins directly off of the Arduino or perhaps off of a 74HC595. Should I use resistors between the outputs and the base inputs to the NTE2013 to limit current? If so, about what resistor value ranges would work best?
... |
H: Energy conversion from Electrical to Mechanical
I have a requirement where I have to design a very small device capable of pulling in and out a small piston through a feedback.I know it can be done using motor but AFAIK I need higher voltage and current which is not possible through, in my case,a button cell rated ... |
H: RANDOM command in PBASIC
I'm trying to use the random command in PBASIC and I'm not sure how it works. I'm using a PICAXE-08 Proto Board Kit, and the chip specifically is a PICAXE-08M2.
Here is the code I'm using:
symbol randnum = w0
RANDOM randnum
randnum = randnum // 2
FOR action = 1 TO 5
IF randnum > 0 THE... |
H: High Quality Free PCB Software Download
is there any high quality PCB software that's free for download? I am trying to design a mother board, and want to be sure of the circuitry. Is there any PCB software that if you order your design it takes your design and manufactures it for you? Thanks.
AI: There are many op... |
H: Using CMOS IC in a TTL circuit
Is it safe to use a CMOS IC? For instance I'll be using a CD4017 in this circuit:
http://www.555-timer-circuits.com/police-lights.html
Will it still function correctly? Any further modifications needed?
AI: No, that's not guaranteed to work.
TTL low level outputs are no problem, but... |
H: How to split Analog and Digital GND planes for a TQFN device
This question is in reference to Mixed signal PCB layout for PSoC.
If I am using a microcontroller which has separate analog and digital supply inputs and GNDs, what should do with the grounds?
Should I connect all GND pins (both analog and digital) to t... |
H: Motherboard and BIOS
I am fairly new to building computers, and I am starting out with the mother board. What are the parts I need to build a motherboard? Also, how can you reprogram your BIOS?
AI: If you're new to it you can't design your own PC's motherboard. Despite their low cost motherboards are pretty advance... |
H: circuit for multimeter without a ic or a timer like ic741 or 555 timer
hey i need to make a multi meter on a bread board without ic or timers. which measures current, voltage, resistance and also inductance . can any show me a circuit which will work . i tried some but all have ic or timers .
some circuits i tried... |
H: Learn C programming before start learning Microcontroller/Embedded Systems
Possible Duplicate:
How to become an embedded software developer?
I want to know whether it is mandatory to learn C/C++ programming before start learning Microcontroller or the Embedded Systems. If yes, why do I need C to start with?
AI: ... |
H: What is the name of this springy type oscilloscope probe accessory?
Exactly what it says on the tin.
How is this pictured accessory called? The obvious place to look for a name would be the probe manual, but it looks like they decided to add the accessory to the package after making the manual, since it's not on t... |
H: Simulating an automotive load dump with a bank of charged capacitors?
I've been working on a data logging device that will eventually go into my personal vehicle. I've scoured the interwebs and built what, in theory, should be a fairly stout power supply capable to handle fast transients and undervoltage and the f... |
H: How can I achieve very bright light?
I'm not sure if this is right site for this, but couldn't find better.
I've been given an task to create something that has light intensity like police beacon. I need it to be cheap, so I'm looking at dealextreme.com LED emitters , but there aren't any good user experience vide... |
H: Verify Truth Table: Switches and LED
I got a digital design problem. My final implementation of the circuit program didn't achieve the required criteria, so I brought my problem and my works here to be suggested by you if I mis-manipulated any details.
Logic System: Binary--1,0.
Issue after Simulation and Test on... |
H: Identifying an irreducible circuit?
How would you go about identifying an irreducible circuit? By irreducible, I mean combining resistors whether in series or in parallel to reduce the circuit.
AI: From the perspective of two given terminals in a circuit (e.g. output signal and ground), any linear circuit can be re... |
H: equivalent load resistance
I have the following circuit
I am having some trouble determining the relationships between Iac, Io and Iacpk. I'm not quite seeing how the final equation for Iac was determined, specifically the factor of (2/π) and Iacpk.
Thanks.
AI: The output current value cited is the average cu... |
H: Non-conductive pads in datasheet?
I'm designing a device which has a DM3CS-SF microSD connector and in the recommended land-pattern for the datasheet they have areas labeled as "Non-conducting traces". What am I suppose to do with these areas? Are these keep-out areas where I shouldn't route anything on the same la... |
H: Why does changing an 'add' to a logical or devour 7 CPLD macrocells?
I have a design that's synthesizing to about 50 macrocells.
I have this section of code:
module levers2(
input [2:0] LL,
input [2:0] RL,
output reg [10:0] DIVISOR,
output reg FAULT
);
reg [10:0] grid[0:63];
wire [5:0] tmp = ... |
H: The best stack-up possible with a four-layer PCB?
I'm designing a 4 layer PCB and I know that the standard stack-up is
Signals
GND
VCC
Signals
(GND and VCC can be switched depending on the layer with more signals)
The problem is, I don't really want to connect all ground pins through vias, there are just too many... |
H: Using AVR reset pin as ADC
I am using an ATTINY13 for a toy application. It simply blinks LEDs in specific patterns. I decided to add a "speed control" using a potentiometer but the only pin I had left is the reset pin.
I've created a voltage divider and padded it with 330 ohm resistors, and things seem to work ju... |
H: Lighting up an old vacuum tube
Does anybody know how to light up a vacuum tube? I have about 9 of them and only 1 I can see the name. It is a 12DT8. Is it possible to find the heater without the datasheet by using a multimeter etc... And if so, is it possible to power it with a DC battery?
I am not trying to opera... |
H: What values of resistor and capacitor to use for AVR reset pin isolation?
Background...
I'm a newbie to AVR applications. I recently built two ATTINY13-based circuits (glorified LED blinkers) which worked correctly (independently) on the breadboard. When I combined them on a solder perfboard with a shared power sup... |
H: VCD files - flatten busses to individual nodes
I was wondering if its possible to flatten all of the busses in a VCD file such that there will be a separate value change recorded for each bit - rather than a cumulative recording of the following syntax: b<value> <identifier>
My goal is to count the number of transi... |
H: What microprocessor for experimentation?
I harbor a secret fantasy (oops, not so secret anymore) to build a simple computer from scratch. I'm looking for an easy-to-use microprocessor to start with. I know about the usual suspects such as the 6502, 68000, 8086, Z80, etc. But I'm wondering if something better is out... |
H: Send GPS coordinates via VHF
I want to set up a system such that wherever a user of VHF presses the PTT button the coordinates from a GPS receiver will transmited to receiver and stored in a computer. Is that possible ? Where should I look around for something like that?
AI: For transmitting data across a VHF or s... |
H: Center tap split supply question
Lest's say that I have the following setup:
a split supply (using two voltage regulators: a positive and a negative one) connected to a center tapped transformer (12-0-12). The output of the transformer is rectified. The center tap is the COMMON of the circuit. Except for the actua... |
H: FPGA programming, where to begin
I'm a software developer (C, C++, objective-c, java ...) and I am interested in learning to program FPGAs. Now the question may appear simple to you but please do take time to help me on this one as I'm kind of stuck right now. My company has asked me to get familiar with the techno... |
H: If I change the hardware/chipset of a USB product, should I change idProduct or bcdDevice?
The product looks outwardly the same, with the same model number, but the USB brains have been completely replaced, and the circuitry's been modified to fit them.
The operating system needs to see different IDs in order to ke... |
H: Wiring Considerations for numerous LED's
I'm working on a hobby project where I'm going to need to wire up 40-80 (not sure exactly how many yet) LED's of various colors. Only 10-20 of them are going to be on at a time. This is going to be a hobby project and I'm by no means an electrician so I don't have the knowle... |
H: Why is LED lighting up despite Supply voltage < Forward voltage
I have an LED which has specified Typical forward voltage of 3.5V and Maximum forward voltage 3.9V.
I applied 3.3V across it with a 300 Ohm resistor in series. Why did it light up?
I am wondering if I can pick this LED as a reliable choice for my desig... |
H: mc1322x on Contiki-os, development environment
I want to ask if there is ready to run Virtual Machine image anyone to develop on mc1322x microchip on Contiki-os.
Why I ask is this, I'm dealing with this for 3 weeks, and what I advance to take is nothing.
Is there anyone who is experienced in contiki-os - mc1322x ag... |
H: What use are the transistors in this (LM317 based) power supply circuit?
I am looking to do a small bench power supply project and am studying various designs based around a LM317. Basic I know but I still seem to manage to have have some questions.
Fig 22 on page 8 of the datasheet shows a design I am trying to u... |
H: Circuit to assign hardware addresses
I'm designing a system with a master board and a variable number of identical daughter boards that I would like to connect in a chain. The master board contains a microcontroller but the daughter boards don't contain anything intelligent. The master board will only connect to o... |
H: Linear Circuit Analysis: Source Transformation
* source transformation is just a combining and rearranging voltage or current sources. I don't think its a universal term.
and I'm stuck. any hint?
AI: Now solving the circuit using mesh analysis:-
For Left Loop:-
160 Im +200 Im+120 (Im-Is)
= 24 .....eq (1)
For... |
H: Print a PCB layout several times in the same sheet at once in Proteus
How can I replicate my layout so I can print several of them in the same sheet without having to do it manually (printing one layout each time and setting its position relative to the previous printing)?
In this layout example, the sheet has room... |
H: How to store audio data for AVR project?
I see a lot of projects for AVR-based audio players that use an SD card to store the audio data.
In fact, I am currently doing the very same thing on an Arduino and its Wave Shield, which has an SD card reader.
However, I'd like to develop a device that stores the sound on o... |
H: How is wristwatch with 10 years battery life possible?
Turns out Casio offers a handful of wristwatches with "10 year battery life". The claim is that thanks to "an advanced technology" the battery life in those watches is extended to ten years.
Now if you look at different models you see that they are rather compl... |
H: Where can I get WirelessHART systems?
The only system I have found is from DUST Networks (aquired by Linear), but no other implementations. Is it possible to implement the architecture on other microcontrollers?
I want to program a microcontroller with HART and communication to my external sensors, and not buy a fi... |
H: Why are lightbulbs considered resistive load?
A lightbulb (a plain old incandescent lamp) is typically brought up as an example of resistive load.
Yet the filament is actually made of several feet of very thin wire cleverly coiled to form a filament which is about one inch long. Clearly coiling the wire this way m... |
H: Specify include path in Quartus II
I'm compiling Verilog using the Quartus II for the Altera platform. In my Verilog, I have a Verilog header global.vh, and Quartus II cannot find it:
Error (10054): Verilog HDL File I/O error: can't open Verilog Design File "global.vh"
Is there a way to specify an "include path" f... |
H: Specify exact pin locations on FPGA
I have an Altera Cyclone IV FPGA, and I use the Quartus II software as the compiler.
In the "PinPlanner" it is possible to specify groups of pins (e.g. data buses). For each group, an I/O bank and an I/O standard (e.g. LVDS) can be specified. Then, the fitter (place and route) pr... |
H: On high voltage power lines, what is "residual power"?
In a television show, high voltage power company workers were helping an animal to safety which climbed up a tower carrying high voltage power lines. The commentator said that though the power was shutdown but still the 'residual power' will be fatal to the res... |
H: How to disable a single op-amp in dual packaging?
I am using a dual op-amp package in a circuit, however I only need to use one. Is there anyway to disable the other op-amp so it doesn't inject electrical noise in my circuitboard? I think grounding the positive input and setting the op-amp into unity gain might be ... |
H: Which is pin 2 on a Harwin Datamate connector?
The datasheet for M80-6651042 Harwin Datamate connector shows us which pin is pin 1.
But which is pin 2? Is it the one to the left, or the one below? Is there a standard direction that pin numbering always goes in for dial row connectors?
AI: By far, most connectors ... |
H: Possible to tap a PLL signal as a clock for multiple devices
We have an oscillator providing a clock signal for an MCU. It has oscillator in and out pins: XTAL-IN and XTAL-OUT.
We'd like to use the same clock signal as a digital clock input to another MCU. Can I simply tap the XTAL-IN signal and use that directly... |
H: What's wrong with this casting in C code for AVR?
I defined two variables:
uint8_t a[2];
uint16_t b;
Next I want to use a as variable of type uint16_t, e. g.
b = (uint16_t)a;
But this is wrong! My programs doesn't works correctly with such code. All is OK when I replace b to uint8_t b[2] and use elementwise opera... |
H: Which 3.3V I/O standard should I use?
I am using the Altera Quartus II PinPlanner to enter all my pin details for my FPGA design. Some of the pins are connected to the SPI configuration bus of this ADC.
As can be seen on page 8, the 3 pins SCLK, SDATA, and SEN must be driven at 3.3V. Now the pin planner gives me th... |
H: real time clck -RTC DS 1307- to Arduino
I am trying to connect the ds1307 to Arduino to get the the time on the LCD and I used this circuit in my project and I tried the example code in the library but it didn't work. What could the problem be?
the code:
#include <Wire.h>
#include "RTClib.h"
RTC_DS1307 RTC;
void ... |
H: Are there any dangers to consider when replacing a permanent AA NiMH battery?
The battery in my electric razor has failed to charge for several years. It does not turn on unless I leave it plugged in for 20 minutes and it turns off immediately if I unplug it. To save some money, save the world, and have some fun...... |
H: What is a reasonable ohmage measurement for a microphone on a PC headset?
I've taken apart my PC audio headset, because the microphone stopped working. This random website seems to imply that most microphones for PC headsets are "low impedance" between 150 and 300 ohms. After taking out the pickup unit, I find it... |
H: How to effectively generate random number with PICAXE 08M2?
I'm wondering how to effectively generate random numbers with my PICAXE 08M2. The following is my code:
; Inputs
symbol push_red = C.1 ; In 1
symbol push_buzzer = C.3; In 3
; Outputs
symbol buzzer = C.2; Out 2
symbol led_red = C.4;
symbol action = b0
sym... |
H: Why don't wires have to be "covered" when making an inductor?
Possible Duplicate:
Why aren't solenoid/electromagnet windings insulated?
Looking at some pictures of inductors, such as this one:
(source: ddmcdn.com)
The wires don't seem to be covered with a layer that prevents current from simply flowing from one ... |
H: bluetooth earphone with usb
I have a Sony bluetooth earphone. It has a usb terminal, which I thought it was only for the purpose of charging power. But when I connected it to a computer, it seems like it is detected as a usb device, not just taking power from the computer. What is the purpose of it being designed t... |
H: DECFSZ won't work on PIC16LF1823
I have a problem while trying to do a Delay on a PIC16LF1823. My program tries to toggle some bits on PORTC for 30ms. I did a simple Delay based on the decrement of a variable; however, each time the PIC execute the Delay it gets stuck on the Delay subroutine forever. I have tried e... |
H: switch debouncing - would toggle switch still bounce
I'm having the classic debouncing headache with the Arduino. The switch is meant to turn an led on and off. So if I use a toggle button (SPDT) would it still bounce? Maybe it won't since it not a push button. How much more would it cost to use toggle? It's just t... |
H: What is the I/O standard for the PCIe data lines?
I am entering the pin information of my FPGA design using the Altera Quartus II PinPlanner. One of the components of my design is PCIe, and I am having troubles understanding the "I/O standard" associated with the PCIe data pins (one rx and tx for each PCIe lane).
T... |
H: Voltage divider for Xbee's ADC - what resistor values?
I have an analog sensor which outputs a value in range 0-3V depending on soil moisture.
The Xbee's ADC requires a value between 0 and 1.2V.
I was thinking about using a simple voltage divider:
Where R1 would be twice as large as R2 thus giving me effective 1/... |
H: Arduino Uno replace with Atmega8
Can I take out the Atmage328 and replace with a Atega8 for programing instead of trying to program using a breadboard?
AI: Atmega8 has a smaller memory but should be a pin-compatible replacement to the Atmega328 for most purposes. Note, however, that the Atmega8 does have a smaller ... |
H: Do I need to solder on my DE2 board to replace a broken segment?
I've already posted a question here about this when I realized that all things were not right with my Altera DE2 board:
Is this display broken or is it a bug?
After verifying that the segment indeed is broken, I contacted Altera who could send me new ... |
H: Basic schematic help
I'm trying to design a lighting circuit for an indoor garden, and I'm not understanding things that seem like they're really basic, so I need some help. The schematic I'm referencing is:
I have a 24V input source which I'd like to limit to 20V. LA is a series array of LEDs such that the total ... |
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