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H: for Loop Through String in VHDL I'm trying to write a loop in VHDL that will print a certain message on an LCD screen. I have predefined the following: constant LCDHP :integer range 0 to 1056:= 1056;--horizontal period constant LCDHPW :integer range 0 to 30 := 30 ;--horizontal pulse-width constant LCDHBP :inte...
H: Is the P.D across a wire with no resistance always zero? According to my very basic understanding of Electrical Circuits, the P.D. across a wire with no resistance is sometimes zero. Take this question for example: "If voltage is measured between two points on a wire, with no resistance in between is the voltage z...
H: Speed control on a ceiling fan induction motor I've managed, through the help of others here on Electronics StackExchange to get a ceiling fan motor running, at least at one speed, and in the right direction. I want to enable 3 speed settings on the motor. How can I enable speed control of the motor? I came across...
H: Low-noise amplification of microphone signals, tubes or chips? When trying to capture faint acoustic phenomena, are vacuum tube amplification designs superior to ICs? In this type of application sensitivity and low-noise amplification are the desired objectives. Should I be satisified with typical modern low-noise ...
H: Need to identify this cable I recently bought this product from Amazon, but need to get a splitter for the 20V output. I need to know what to look for though, and cannot identify what kind of cable this is / what to search for. The print on the cable is (UL) SPT-1 2X20AWG VW-1 105°C 300V E307922 WL C(UL) SPT-1 2X0...
H: Difference betweeen analog and digital IC deisgn flow I tried to find the main differences but not too sure on what could be the main differences in analog and digital design flow. Apart from the circuit design and verifying your circuit level or test bench level design what should one be more concerned about for A...
H: How power meter works for residential buildings? If power is current times meter shouldn't the overall resistances and inductances and capacitances of my house appliances be known so the power meter could calculate the power. I look at my house as a closed circuit. some people say the amp meter measures the current...
H: Electric bill for reactive power I have read that if you don't unlug the charger from the socket after charging your phone, although it is not connected to the phone, it still consumes power and your electricity bill adds up. On the other hand if I leave the charger plugged without the phone I assume the only powe...
H: Voltages to keep my circuit running at 200mA with NMOSFETS Im trying to build a circuit to send information using IR led, using pulse signals my leds (TSAL6400) operates at 1.35V, and their maximum pulse current is rated 200mA After struggling a bit with BJT transistors, and realizing that since I'll send the data...
H: If a battery case falls apart is it safe to just glue it back together? I've got a battery with two Li-Ion cells inside that has a two-parts rectangular case and those parts were somehow tightly connected (I guess glued together) but then fell apart and now the cells and the service electronics are in one half and ...
H: How to ground a vintage device that was powered without a ground? This is a follow-up to Is there a mathematical relationship between the battery AH rating, and that of the transformer in the charger Since that post I've uncovered a vintage battery charger (Manufacturer: Philips Model: PK-5000) in the old house it...
H: How to include schematic page name in OrCAD BOM I am generating BOM in OrCAD. How can I include a part's schematic page name in the Bill of Materials csv file. AI: You can't do that directly. You could generate the xref file and use that plus a one-part-per-line BOM and merge them in Perl or Excel.
H: LPC2148 ADC problem with voltage divider for battery edit: solution found with our new board revision; outside of careless mistakes, buffering the signal with an op amp seems to have resolved the issue (as suggested by Joshua below). I am working with a custom PCB using the ARM LPC2148. I'm trying to measure the ba...
H: What's the simplest way to generate a VGA signal for a totally white screen? Preferably with an AVR MCU I'd like to make a simple board to plugin a LCD monitor and get a blank white screen. The idea is to use any monitor as a makeshift light table. I have a preference for 8-bit AVR micros since I have a couple layi...
H: Voltage Required to Ignite 10ohm resistor I just read http://www.bigclive.com/ignite.htm It shows igniting a 10ohm resistor with 12 volts. I was wondering, could a 10ohm resistor be ignited with less voltage(say, 9Volts), and if so, what is the minimum voltage? AI: DO NOT destructively test resistors or any other d...
H: AC current sensor What would be a simple circuit to monitor a 120 volt line current? Connecting an Arduino to the circuit would allow one to detect when the attached device has shut down, for example a washer, dryer; or perhaps to monitor usage, a child's TV. AI: Many exist: Two possibilities: Current transformer...
H: How to control a Water Valve through a circuit using latches or flipflops? I need a circuit that can "simulate" opening/closing a valve for a water tank. The circuit has only 2 inputs, 'm' (minimum) and 'M' (Maximum), and an output 'V' (valve). The valve is only open if V= High(1). The tank has a floating water met...
H: Why are deep cycle batteries rated in amp hours instead of watts hours? Why are deep cycle batteries rated in amp-hours instead of watt-hours? For example if I see a 85Ah battery, I multiply 85Ah x 12V to get 1020 watts. As household electricity use is measured in watt hours (hence a kill-a-watt) this information s...
H: Onboard temp sensor for household thermostat - accurate enough? Many microcontrollers, such as the TI MSP 430 have an on board temperature sensor. If one is designing a typical smart thermostat for heating/air conditioning is this sufficiently accurate or would there be any practical advantage to using an alternati...
H: Starting motor for 5 seconds after 30 minutes, turning it off and start in reverse direction after 30 minutes I want to start a 9v DC motor in one direction for 5 seconds after 30 minutes delay, then turn it off and then after 30 minutes, restart it for 5 seconds in reverse direction and then stop it. The same proc...
H: What flip-flop should I use to design a logic circuit with minimum number of logic gates? How can I know with which flip-flop I can design a complex logic circuit with minimum number of logic gates? In our homework and exams, we are supposed to use minimum number of logic gates. In one problem, we are asked for des...
H: How do I calculate the required value for a pull-up resistor? There are many tutorials that use a pull-up or pull-down resistor in conjunction with a switch to avoid a floating ground, e.g. http://www.arduino.cc/en/Tutorial/button Many of these projects use a 10K resistor, merely remarking that it is a good value...
H: Simple transistor switching example should show LED off UPDATE So even when I remove the switch, the LED is still on (see image below). I.e. there's nothing connected to the base; only to the collector. I'm using the same 2N2222-331 transistor that's in the book (I actually got all my components from the Kit sold s...
H: A Battery Charger which can extend LEAD ACID Battery life I am making a battery charger for a 45AH LEAD Acid Car Battery. That I will use with 100 W (1 A 100 V AC) UPS. I need to know that what things I should keep in mind so that the battery charger charge the battery efficiently so as to extend its life. For now...
H: How does the efficiency of a transformer change with its load? How does the efficiency of a transformer change when the load changes, and why is that so? AI: Increasing current causes increasing copper losses due to resistance. Resistive loss is determined by current^2 x resistance. BUT, Power is determined by ...
H: Client server WiFi structure We have 3 measurement system and a master computer. Only the master computer have access to the Ethernet because of this we would like to use WiFi connection, but for this purpose I have no idea which part fits the best. The measurement systems are 500m to 2000m away from the master. I ...
H: Looking for a chip to connect to internet and display text I am looking for a small chip that will be able to connect to the internet and display black & white text. I'd like to program the chip to connect to a remote service and display text accordingly. What chips do you recommend? Do you know the prices? I am no...
H: Will this setup create much audio interference for me? I'll be installing a ipod adapter kit in my 2004 honda accord, and on the device that connects to my stereo, it includes stereo outputs - red/white - that i can connect with a stereo to 3.5mm cable to plug in any other device and listen to it through the stereo...
H: Will there be a problem if I stay almost in the border in trace spacing when dealing with line voltages? The IPC-2221 standard shows that 1.25mm will be enough at less than 3050m at 250V (220V is the line voltage here in Turkey), even if the coating gets damaged. However, people generally recommend 5mm even 10mm. W...
H: Why are audio transformers required? I was looking at simple AM radio schematics and came across this one: As you can see it has an audio transformer. I'm still attempting to grasp the concept of impedance and such, so can someone explain why this is necessary? And how would such a transformer even work to change ...
H: How to solve speed issues in a double buffered + video overlay system I've decided to start a small project over this break for creating a very simple GPU. As far as the GPU will go for now is simply receiving pixels and outputting pixels to SDRAM. In addition, there is another part of the circuit that will get pix...
H: Reading From a Large Array of Photoresistors I'm an undergrad just starting to study Electrical Engineering. For the first hobby project I'm starting, I want to use a microcontroller to read analog voltage values from a very large array of photoresistors (18x24). From these values I will pinpoint the location of va...
H: Interrupts with 16f887 and MPLAB need some help with interrupts and the 16f887. I'm using MPLAB and writing my code in C. I am using the 44-pin demo board from Microchip. There is a push button wired to RBO/INTO which is normally high, and pulled low when the button is pressed. I've already verified that the input...
H: Virtual Breadboard design I am building a open source application in which digital circuits can be built on breadboard using IC, wires, LED and some off board components(clock, 7-segment etc). I have made a initial design of breadboard (through programming, not in image processor), i have some questions regarding t...
H: Conceptualizing an analog input pin on a microcontroller? As I am trying to learn basic circuit design I would like to build and simulate simple models to test my conceptual understanding. One of the first designs I am trying to tackle is to use an analog input pin on a microcontroller, but it is not clear to me ho...
H: Can I wire the two sides of a L293D Dual H-Bridge together if I only need one H-Bridge? Background: I'm using an L293D dual H-Bridge to drive a DC motor, but only one motor, and the package contains two complete H-Bridges. This is all being soldered onto Veroboard (stripboard). Question: Is it possible to use the t...
H: Aluminum project box: should BNC conenctors touch it? I want to make a aluminum shield box (this is my first time!), I made some holes to host some female BNC connectors. Now my question is, should I isolate the BNC connectors from the box? Or should the outer shield of the coaxial cables touch the shield box? Upda...
H: Maximum attainable delay with Micro controller I am designing a microcontroller based delay circuit to implement delays of 2 hours, 1 hour, 45 minutes, and 30 minutes. The circuit will automatically turn on off a relay after this time period has elapsed. I am stuck with a narrow selection of microcontrollers availa...
H: Need help with 16F887 and Microchips 44-pin demo board I need some help using a PIC16F887 and the provided 44-pin demo board from Microchip. Its being programmed with a PicKit2. On this demo board, there is a push button connected to RB0 in such a way so that the level at the pin is high all the time, and pressing ...
H: Properly charging and discharging Lithium cells during battery testing? I'm working on some software that automates charging and discharging battery cells to generate discharge curves. I have a few concerns about properly charging and discharging of lithium-ion / lithium-polymer cells: Concerns: I understand when ...
H: Splicing tiny wire inside broken mouse cable I don't know a lot about electronics repairs, but I've got a relatively expensive laser mouse that got a frayed connection on the wire: I'm wanting to repair it as it's out of warranty. I've cut the cable on either side of the "stopper", isolated each of the individua...
H: Very small camera or endoscope like device with minimal electromagnetic noise generation I need to be able to visually monitor movements of a recording electrode inside an electromagnetically shielded chamber. This is a cylindrical chamber of 1" X 1" and is in absolutely dark environment (I can use a light source w...
H: resistor equivalent for non parallel non serial What formulas do I need to calculate the resistor equivalent for not just the normal parallel and serial connection? e.g resistance from A to B og these five resistors: Is Kirchhoff's laws and hard work my only option? AI: Yes, when you're faced with a bridge (which ...
H: Maximum operating temperatures of different lead acid batteries What are the (generally) safe maximum operating temperatures of various lead acid batteries such as wet cells, sealed lead acid, glass mat? I'm looking for a battery that can withstand around 60 degrees C at a low discharge rate (recharge would be at r...
H: Why do we need 100nF cap in the output of an SMPS? I was looking at Micrel AN-53 and I have noticed that in a circuit in the first page (circuit is below), at the output of an 400KHz, 27V, 7A, 180W boost converter, there are two 680 uF, two 10 uF and one 0.1 uF capacitor. I can understand that 680uF capacitors are ...
H: What's the automatic equivalent of a variable resistor? I have a circuit which controls the volume on a speaker by a wheel which is attached to a variable resistor - I want to reproduce this but instead of using a manually operated variable resistor, I want to use ...something else instead - Ideally something where...
H: generic term for inductors/capacitors/transformers for power-handling applications Can anyone think of a generic term to cover capacitors and magnetics for power-handling applications? (is there one?) I want to distinguish from power semiconductors and signal-level capacitors/magnetics. AI: I don't think there is a...
H: Best size of heat shrink tubing? I'm attempting to shrink wrap wire connections for the first time and I am wondering what size of heat shrink is needed for i.e. a single 22 AWG wire. Could it be any heat shrink tubing that fits the wire? Or is there a certain size that it shrinks to so that I must purchase one no...
H: Accepting a Range of Input Voltage that Straddles Operating Voltage I want to design a system that runs at 5V and about 350mA. I want that system to accept an input voltage between 1.8V and 15V. How can I achieve that goal with a minimum component cost in my input power circuit? Is there a single "regulator / boost...
H: Creating 1 hour delay with 89C51 micro controller I am writing an Assembly Program function for 89C51 which can create one hour delay. I can't use any other micro controller as only 89c51/52 is available locally. So I am stuck here because even when I set R5 to #255 the maximum delay I can create this way is only ...
H: Voltage across a surge protector plug Firstly, this applies to the UK - so 3 pronged sockets and 240V. Short and sweet question - should there be any voltage difference between the live and neutral prongs on a surge protector once it has been unplugged? AI: Transmogrifying your "should there be any voltage?" in...
H: Disabling digital input buffers on output only pins (PIC18) Not really a problem, just curious. I'm using a PIC18LF13K22 and the datasheet mentions that I can disable the digital input buffer for a pin by setting its corresponding bit in the ANSEL register. Since I'm using some pins as digital outputs only, would I...
H: Converting Power/Watts in DC to Power/Watts in AC? How can we convert Watts in DC to Watts in AC? for e.g A device needs 1A and 12V DC input i.e (1A x 12V = 12 Watts) 12 Watts DC. If we use an AC to DC adapter/converter to generate 1A,12V (12Watts) DC then What will be the AC Power/Watts that we have to input into ...
H: Values of inductance - what is the "base" value? I have a selection of salvaged inductors, and I don't (yet) have an inductance meter. I would like to know what the inductances are, but I have a problem. They are numbered with 3 digit numbers - I assume this is in the same format as capacitors and resistors - 2 dig...
H: Calculate the value of an inductor using an RL or LC circuit Given an inductor of an unknown (though magnitude-estimatable) value, and a resistor of precisely known resistance, how can one calculate the inductance of the inductor? Tools I have at my disposal: Oscilloscope (both digital and analogue) Signal generat...
H: mute de-amplify sound volume I want to de-amplify the sound volume of my television. My native language is not english, and I do not know the correct word, if any, for the opposite of amplify. When my TV is turned from volume zero to volume one, the heard sound jumps to something that is too loud. TV volumen scale ...
H: EtherCAT topology and timing constraint question I'm trying to understand how EtherCAT works. The Wikipedia page says that data is processed as the packet passes through the device. Does this mean devices must be linked in a string formation? What if processing of a packet where to take longer than the time the ...
H: Frustrated With D flip flop assignment We are doing a project at school with AOI, NAND and NOR logic. The logic is used sequentially to display a number on an LED display, more specifically it is suppose to display the numbers of your birthday in this order: MM-DD-YY. The output of the LED display is determined by ...
H: How to supply a negative voltage from a simple battery or psu? I am using an op amp (741). I need to supply its pin 4 with -5 volts using a power supply unit from a computer or from a simple battery. How am I going to do that? AI: The best thing to do with an LM741 in most cases is to replace it with a more modern ...
H: Chaining up two solar panels of different wattage? I have a 30 watt solar panel and I'm looking to add a 80 watt solar panel to help power an 85AH battery. I know I need to connect them in parallel (positive to positive, negative to negative) but I wonder if the difference between the wattage of the two panels woul...
H: ATX power supply max current 12V P8 connector I'm using a ATX power supply as a unit for my project. The power supply is of the type "be-quiet" straight-power E8 480W with cable management. I cannot figure out how much current can I get from the 12V P8 connector, which has 4 12V poles and 4 ground poles. My need is...
H: How does this Digital-to-Analog converter work? This question: RoboCup Junior IR Ball detection has a link that includes the attached circuit for D-A conversion. I understand that the output of the sensor contains several amplitudes, and that the "summation" of the signals is being stored as a charge in the capac...
H: Stripboard layout for a 16x16 dot matrix display I've been planning a Veroboard/stripboard layout for four dot matrix LED displays. Most of the complexity is due to the daft way companies break out the pins on the 8x8 modules. This is what I have so far: The fat lines are wires, and the striped orange bits represe...
H: Measuring a soundcard output voltage I have been experimenting with a Soundcard Oscilloscope and I am having some problems understanding what's going on! I have attached a screenshot of my digital scope setup. My hardware setup is simple. I have a male to male TRS jack running from my line out into my mic input. I ...
H: A few questions regarding B/E-fields in practical circuitry I have been trying a few learning resources to help unlearn some of the notions that electrons flow through as energy. Chiefly this resource is what I have used: Amasci - IN A SIMPLE CIRCUIT, WHERE DOES THE ENERGY FLOW? My questions are: Does energy transf...
H: Should I ground my case I built up a LM317 power supply which is working great. I have moved it into a large case as I am now powering it off 240VAC (fused) down to 18VAC then rectified into the power supply. Which is going well. I also put a much bigger heat sink on it (1.4C/W). The plan is to set up another one i...
H: Explanation : Latching Relay Circuit I need to understand the flow of this circuit well. The objective of this circuit is to switch the latching relay "OFF" or "ON" (in two states) depending on the state of the I/O's of the MCU. I need to understand how this works. The relay is a 9VDC, 60A, 250VAC relay, and the br...
H: Relay datasheet question In the datasheet, they wrote: Rated frequency of operation with / without load 6 / 1200 min-1 What's the signification of this line ? When they talk about Mechanical endurance cycle, is it open to close or open to close to open AI: They say Max. switching rate at rated- / minimum load -...
H: Higher spec LED near the center of the wafer? Does anyone know if it is true that chip tolerances are tighter towards the center of the wafer? There is a vendor that claims that "we pick our LEDs from the center of the wafer". Because of inherent production variation, LED manufacturers sort the LEDs so you get pa...
H: Arduino - interrupt based decoding of serial data, race between ISR and loop() Trying to decode serial data (encoded using proprietary method) from a RF module. Having switched back and forth between the fast-sampling (4x the fastest freq) and of late an interrupt based method, I've reached a dead-end and not sure ...
H: What specification for IR communication to AV equipment? I'd like to task a micro-controller to use it as a universal remote. What is the specification used for IR communication to AV equipment (TV's, etc.) and where can I find it? AI: A worthy task and one which should keep you usefully employed indefinitely ! :-)...
H: Need help with designing IR sensor, current to voltage converter I would like to measure accurately (as possible as) using an IR LED and an IR phototransistor. I am using the following parts SFH4550 - IR LED BPV11 - IR Phototransistor Obviously, the transistor gives a current output proportional to light. That cur...
H: General PSpice and 555 timer question regarding precision I have been experimenting with values recorded using a multimeter versus the voltages (RMS) simulated using capture. I simultaneously setup a circuit using a breadboard and drew exactly the same circuit in PSpice. I don't really have a particular circuit in ...
H: How is the fact that the resistor used to limit the LED current dissipates some of energy addressed in lighting applications? LEDs can't be connected directly to a source of power - only in series with a current limiting resistor. Which means that when the LED is powered some power is dissipated by that LED and som...
H: Get multiple individual DC voltage sources from a single line If I connect 2 6V batteries or two individual sources serially the combined voltage should be the sum of the voltage of each battery (i.e. 12V). Is it possible to get 12 volts from a single source or battery of 6 volts? Actually I have to power my DSL ro...
H: Why do chargers heat up when operating? From my experience all chargers for Li-Ion batteries notably heat up when charging the battery. Why does that happen? Is the charger acting as a not that efficient power supply or is there any process inside it that is specific to charging that leads to such heating up? AI: N...
H: Applying an oscillation to a DC voltage? I've lost a 555 IC that I had owned, so thought I'd make an relaxation oscillator for practise out of an operational amplifier: The example of the simulator I have been using creates a square wave quite nicely, however there is no battery or current attached to it. Is it po...
H: Are there reasons *not* to have a copper-pour ground plane on a PCB? I am taking a first stab at designing a PCB from scratch. I am considering using a CNC mill fabrication process, and it seems like with this process I would want to remove as little copper as possible. A copper-pour-style ground plane would seem t...
H: Automatic RTS control for RS-232 to RS-485 converters I got my prototype RS-485 circuit working. Now, I've connected it to my PC through RS-232 as I want to make the PC as the master. However, when I connect to the circuit using Hyperterminal, the RTS line, connected to RE and DE, always goes high. The PC can send ...
H: Circuit to remove noise from digital communication line Carrying on further from my previous post and drilling down to specifics, I am trying to figure out the right way to implement "glitch remover", or "noise remover", using electronics (i.e. not in software). From one of the answers in my previous post, I learnt...
H: PIC24FJ64GA002 not running at speed I'm trying to get my PIC24FJ64GA002 running at 32 Mhz. I measure the frequency on OSCO pin, and it's only 4 Mhz. Here's my code: config __FOSCSEL, FNOSC_FRCPLL & IESO_OFF config __FOSC, FCKSM_CSECMD & OSCIOFNC_ON mov #0x1182, W0 ...
H: Effects of changing the frequency of a transformer If the frequency of a transformer is decreased by keeping voltage same, then what will be the new kVA rating, magnetizing current and inductance, the induced voltage and loss of the transformer? AI: I'll assume that your question is meant to apply to power transfo...
H: What keeps mains power at 60hz? In a power plant, what keeps the power at a solid 60hz? It seems like turbines can't always be running at the exact same speeds, given that combustion doesn't always give the exact same temperature (my dad works at a waste to energy plant, which is why I say this). Also, just for gig...
H: Level Shifting 1.8V to 5V with N-channel FET I am using BeagleBoard-xM GPIO outputs to drive some DC motors with the help of L293D IC. The problem is that there is a difference between voltage levels. The GPIO outputs only supply 1.8V while L293D needs at least 4.5V for logic high. So I need a unidirectional voltag...
H: Does any current flow through C-E of NPN BJT when the base is floating? UPDATE Have included an image. As you can see, LED is ON when base is floating. This is a 2N222A transistor. Playing with an NPN bipolar transistor. The Collector is connected to the positive terminal of a 9V battery through a 1k Ohm resisto...
H: Communication between modules over USB using a uC I have a module (say A) which sends data serially to me at 5 Mbps. I want to transfer this data to another module (say B). For B, I have a few choices for links: USB, UART, PCI/E, etc. I am not sure but I think USB would be the best choice at such a high data rate. ...
H: LM2596 Voltage Regulation Problem I am trying to implement a switching voltage regulator from 7.2V to 5V with LM2596 by HTC Korea. Since I don't need an adjustable regulation, I chose typical application circuit from the datasheet which is for fixed output voltage (seen below). I use 1N5817 (20V, 1A, for testing o...
H: How to name what this resistor is doing? I have a basic circuit that uses a photoresistor powered by a five volt source. I had made this project to show my son about various sensors and had used a circuit I had found online. It looks something like this: simulate this circuit – Schematic created using CircuitLab T...
H: OPAMP has voltage on its supply when it shouldn't I was trying to design a circuit after seeing this question. I know I used too much components than I should designing a circuit with this purpose. And sorry about the messiness of the schematic. This circuit compares V1 and V2 and if V2>V1 than it outputs V2. If V1...
H: Difference between busses I think I am confusing the difference between some of the of busses, such as IDE, SATA, USB, and PCI. What is the relationship between all four, how are they connected to each other? From what I read it seems like PCI connects them together as well as to the CPU, but it's not clear. Any ...
H: Arduino, problem with displaying RFID ID I have recently gotten a Parallax RFID reader and I was trying to make it work with my Arduino uno. I have gotten all the necessary wires attached and I used a RFID reading program I found from Make (I will put the code at the bottom). When I open serial monitor and move an ...
H: Capacitor self resonance in a buck converter I'm building a 5 V regulator for a PCB, and I was reading through the datasheet and Wikipedia to make sure I was doing it right. What baffles me is that the regulator switches at 150 kHz. Yet most sources I've found online say the self-resonant frequency of your average...
H: Switching Question I am designing a power control panel for the room of many applicants. In the panel there are several micro switches available for the user to turn the appliances ON/OFF. At the end of the micro-switch there I place relay for controlling load of 220V (AC). I am powering the circuit by 12 volts. I ...
H: How long will laptop run from UPS? The laptop has input: 18.5V, 2.7A The UPS output is: 220V, 6.82A and also something about 1500AP I have no idea how to work out how long I would be able to run the laptop off the UPS when the UPS is disconnected from the mains. AI: Re The laptop has input: 18.5V, 2.7A The UPS out...
H: Noisy data line clears up on wiring up multiple output pins of uC to Logic Analyzer Some people reading my question might be familiar with a string of questions (latest being this one) where I have been asking about how to decode data from an ISM-band ASK/OOK type RF receiver module. One of the excellent techniques...
H: how choose transistor for driver circuit of stepper motor? I need to drive a 1A stepper motor coil from a digital output that can source only 5mA. That would require Hfe of 1A / 5mA = 200, but I can't find a transistor with that much gain. Is there any transistor that would fit, or is there something else I can d...
H: What type of 8-pin ribbon cable connector is this? What type of ribbon cable connector is this in the picture below? I would like to order a compatible male end for a converter plug I am designing. Edit: The pin spacing (as measured with a digital caliper, by averaging the inside and outside measurements of two pin...
H: 3.3v to 5v Translation I'm in a bit of a pickle here. I need to translate 3.3v to 5v ttl levels. The devices I'm driving (12 total) are not low current devices so I don't want to interface directly, even with a current limiting resistor. This is a reference design that I plan on selling and I want it to be as f...
H: GND/Vss of 2 circuits with independent power supplies, and usage of scope/logic-analyzer Probably an elementary electronics question. If I would like to trace waveforms from 2 different circuits with independent power supplies, s.a. an RF transmitter which uses a 9V battery and the RF receiver which uses a wallwart...
H: Getting 1.2V from USB I have FIIO E3 headphones amplifier which is powered by 1.5V AAA battery. Am I using it just with my PC, so I got an idea: why don't I power it using USB port and stop buying new batteries ? Anyway, I have few questions regarding that: 1) I know that USB port can give 500mA, but somewhere I've...