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H: Motor for precise low speed motion but also capable of high speeds I'm trying to design a system that should rotate at up to 4000 rpm when needed but also be capable of precise (hopefully sub degree) positioning at under 100 rpm or less. I have an absolute position encoder for closed loop control. The load on the m...
H: PLL Loop Filter and its influence on speed I was doing some research on Phase Locked Loops (PLLs). Now what I understand is, that the Loop Filter is first necessary to suppress unwanted signals on the VCO, so the tuning is controlled by the DC value of the Phase-Freqency-Detector (PFD). So the loop filter is a low ...
H: Digital insulation meter measurement limits A Meggar digital insulation meter user manual warns: "When using 500 V measurement to measure resistance less than 1.5 MΩ or 1000 V to measure resistance less than 5 MΩ, measurement time must not exceed 10 seconds." The problem is that i need to make measurement beyond ...
H: Powering ISO124P Isolation Amplifier I need to use an ISO124P isolation amplifier. The data sheet for the device is here http://www.ti.com/lit/ds/symlink/iso124.pdf My question is with regards to powering the amplifier. I am really confused with the power supplies. I think I need two different power supplies. Per...
H: Vacuum robot sensor Some one knows what kind of sensor is this and how it works? Is from a vacuum robot. I guess to check something on floor. I would like to connect it to Arduino. AI: That appears to be some sort of fluorescent lamp. Note that the wires to the connector are labeled IN+ and IN-, and the wires to t...
H: Is a valid USB VID/PID necessary for strictly embedded use of the Bus? So the system of USB VID/PIDs as far as I understand it is to avoid conflicts between devices and the USB-IF is handling the distribution of these IDs and wants a fee if you need a VID and a corresponding PID block. Now how is the situation look...
H: How does CLKOUT works on the LTC2323-12 ADC on "High-speed" speed mode? http://www.farnell.com/datasheets/1833817.pdf I was assigned a task where I have to connect an LTC2323-12 ADC (analogic to digital converter) to an FPGA. Reading the LTC2323-12 datasheet seemingly it has two ways to be controlled. One way is th...
H: What could happen if a lightning strikes a car with a battery connected to the chassis ? I was wondering today what could possibly happen if a lightning strikes my van where I have a 12V battery negative connected to the chassis. Could that destroy the battery or start a fire? In order to prevent it should I disco...
H: What's this sensor called? Found it in my AC unit It's a 2 wire sensor I found in my central home air-conditioning unit. Any ideas what it's called? Wasn't able to find a part number on it. Is there a test I can do to find out, using a multimeter? AI: This looks like it could either be a thermocouple or thermistor....
H: How can these GPS/GPRS bike tracking locks be so power saving? I am really puzzled by how these GPS/GPRS, solar-powered bicycle locks seem to be running on very little power. They are fitted with a tiny solar panel. As you may know, these locks are popular these days with publicly shared bicycles like OFO, Mobike e...
H: Do I have to use a MAX485 chip in front of an ATXMega microcontroller? I'm doing a project which involves receiving DMX 512 information on an ATXmegaA3u microcontroller. I've successfully implemented the protocol using the onboard USART of the microcontroller. Basically, 2 frame errors, then 512 valid bytes. Regard...
H: Determining speed of turbocharger via sound? There are inductive sensors which can be retrofitted to turbochargers to measure their speed, like this: Examples can be seen here. Installation requires some careful and precise drilling and threading in addition to removing and re-installing the turbo itself, which is...
H: Pulse withstanding capability of standard resistors How much pulse power does a standard (i. e. not further specified) resistor withstand? Consider for example a MOSFET and a 33R resistor that is connected to its gate. If the switching voltage would be 10 V, the resistor sees up to 3 W every time the MOSFET gets ...
H: Gerber Setup Options I have almost finished my PCB design and preparing to make Gerber files. I have some doubts related to Gerber Setup Options of Altium Designer 16.1.My first quesiton about Files->Fabrication Ouputs->Gerber Files->Drill Drawings menu. I have selected both "Plot all used drill pairs" options. Is ...
H: Frequency response of dual vs single op amp: OPA2890 vs OPA890 I am looking for an op amp to use as a unity gain buffer with a disable feature. The OPAx890 looks like a good candidate because it is unity gain stable. I have noticed that some op amps labeled as unity gain stable have worse stability than others (e.g...
H: Can an electronic device continuously sweep the voltage? Modern power supplies can sweep the potential in a given range with a specific rate. I am curious if the electronic devices can continuously sweep the voltage (in a perfect sense) or it is just step-based changes, which seem like sweeping? For example, consid...
H: What will be the current of a 24 V ATX power supply? I have an ATX power supply with a +12 V 8 A line and a -12 V 0.8 A line. I assume if I used the -12 V as ground to provide 24 V, then the maximum current provided by the 24 V line would be 0.8 A? AI: Your assumption is correct. \$\$
H: Motor of what type should I choose? I want to build something that behaves like a regular magnetic compass, but using this electronic compass and some motor what will rotate the arrow pointing to the north. So I think the motor must satisfy the following parameters: 360 degree continuous rotation Rotation to the ...
H: Resistance of a material during dielectric breakdown? Basically my question is that when a material (let's say air to be specific) undergoes dielectric breakdown with enough voltage, how conductive does it becoming during the breakdown? Maybe that depends on different factors, so let's just say for air in standard ...
H: Tenting Vias in PCB I am making a PCB layout in Altium Designer. I have selected "Force complete tenting on top and bottom" for vias. Does it have a disadvantage or more expensive? Tenting seems better but i wanted to be sure. Thank you so much. AI: Full tenting is normal. You will be fine if you fully tent all via...
H: The NUCLEO F411RE Works with float point? I need a MCU to works with Wifi and Floating point for PID application. In the later I acquire a Wifi expansion board, but I wants know if the STM32 NUCLEO FR11RE works with a Floating Point. I don't find this information in web. http://www.st.com/en/evaluation-tools/nucleo...
H: Discharging an inductor I wanted to know if it's practically possible to use inductors the same way we use capacitors , in the sense of charging it using a charging circuit then discharge in another circuit. I thought it could be possible but then i read on the web that when an inductor is disconnected the magnetic...
H: How to design a buffer amplifier for STM32 ADC So the purpose of this circuit is to buffer a 0-5V signal coming from a potentiometer sensor. The processor is 3.3V tolerate. the sampling switch resistance as 6K. the processor is a STM32F429 are there any issues with what i've done? AI: are there any issues with wha...
H: Would a triangle wave have finite or infinite sinusoidal components? A discontinuity causes a signal to have infinite sinusoidal components, but a triangle wave is continuous, I was taking a class in which an instructor said that since the triangle wave is continuous it can be represented by a finite number of sine...
H: Finding the heat dissipation but calculations not going right? I am trying to find the heat dissipation from a 20000 V 1 A filament which is on for 1 second. I just randomly came up with this to try to test my understanding of joules first law and ohms law with this problem. Now when I start doing the math. The way...
H: Where to ground low pass filter before dual supply operated op-amp? The circuit below shows my setup. The resistor and capacitor act as passive low pass filter. In my setup the C1 is grounded to GND (0 V) but the op-amp operated with dual supply (+-5V). My question is this, do I need to ground the C1 to -5V for neg...
H: Short coax for carrying low frequencies (120 kHz) - does it matter if it is 50 Ω or 75 Ω? I'm using coax to carry signals whose highest frequency component is 120 kHz over a distance of 2 or 3 meters. Does it matter whether the characteristic impedance is 50 Ω or 75 Ω? My feeling is it does not, but I would like a ...
H: ungrounded chassis shielding I'm looking into whether an ungrounded metal box provides good/bad EM shielding. This thread seems like a definite "good", for reasons of the box acting as a faraday cage : How much shielding does an ungrounded metal box provide? But when a similar question is asked about ungrounded cab...
H: Lightning detection I am planning to build a device that has a capability of early detection of a lightning. Also we want to measure the magnitude of the lightning and can anyone suggest a way to measure the magnitude of a lightning using magnetic flux induced by that lightning? AI: A simple RF inductor will work a...
H: LT8390A Resistor Power Ratings I'm very new to the world of EE and I'm attempting to build my first buck/boost converter using Linear Technology's LT8390A. For the most part I have been able to follow the datasheets instructions; however, the one thing I'm unsure about is how to calculate the necessary power rating...
H: Bridge rectifier: 4 diodes vs. single chip? I notice (among the DIY audio enthusiasts at least) that when it comes time to design a power supply for an amplifier, DAC or whatever that the parts list will inevitably include something like "4 x MUR860 diodes" for the sake of building a full wave bridge rectifier (MU...
H: Setting ground potential in nodal analysis matrix form I have a general question concerning the matrix formulation of nodal analysis. I investigate a large resistor network with tens of thousands of resistors and some independent current sources. I set up the conductance matrix as usual with the positive sum of all...
H: How do you edit a part's symbol in Fritzing? How do you edit the circuit symbol and pcb shape of a part in Fritzing? I want to edit a "1x6 SMD header" part to only have 3 pins, so I effectively just need to "chop off" half the part. If I right-click on the 1x6 part and select "Edit", it opens the part editor, but t...
H: Battery selection I'm making a little robot and I can't find a proper battery for it. I thought about CR2032 but it has a very little max current output. I need a battery that can deliver at least 1600mA and a voltage of at least 6V, being as small as posible. Which can I use? Edit The voltage is trivial, I could u...
H: What kind of waste is a battery? Is there an efficient way of recycling or reusing waste batteries and where am I supposed to throw it (Biodegradable, Non-Biodegradable, and Recyclables) ? AI: Battery disposal 101 Waste batteries have different disposal requirements depending on the size and chemistry -- disposing ...
H: What is the significance of FO4 inverters in CMOS static circuits? With regards to the image above, I wanted to know what is the importance of Fan Out of 4 (FO4) for optimum design and what improvements does it incur over designs that are either higher or lower than fan out of 4? Also, with respect to the picture,...
H: LEDs in parallel WITHOUT Resistor and Constant Current Before I go on, I should stress that I have read many many other forums and scoured all stackexchange recommended 'questions that may already have your answer' things, and none of them answer my question. Let's say I decide to put 3x 20mA 3v LEDs in parallel. T...
H: Connecting wires I think it's a basic question for people who know circuits. I am trying to extend a cable of circuit board however I am not sure which wire to join with other wire. The orange cable (with blue, white and brown wires) is the original cable which was connected to the circuit board and white cable (wi...
H: Naming convention for a voltage follower op amp I have a voltage divider which creates a 1V signal that is sent to a voltage follower op amp. This might be a silly question, but is there a well accepted naming convention for this very common type of circuit? "+1V raw" and "+1V" sounds a bit weird but I didn't know...
H: Increasing the range of cheap RF module I am trying to increase the working range of cheap arduino 433 mhz RF link modules like these https://www.sparkfun.com/products/10534. The page says they have range of 500 feet in perfect conditions however in my case it's more like several feet. So I know I can extend the ra...
H: Does footprint matter when selecting a part in Kicad? When designing a circuit schematic in Kicad, does it matter what footprint or package is listed in the part name? This is similar to this question, but I'm more confused about the naming scheme shown in Kicad's part selector in the schematic editor. As I underst...
H: Digital circuit to toggle on rising edge of two signals I need to design a circuit to toggle on the rising edge of two signals A and B. A is a square wave @10Hz, 50% duty cycle. B is a pulse that gets generated approx 20-30us after the rising edge of A. I came up with a circuit to achieve it, but it uses monoshots...
H: SP4T slider switch on two states at the same time I have a SP4T slider switch, where common is connected to the power rail and each pin is connected to a led and resistor. The problem is, if I position the switch between two terminals, the leds of both terminals light up. Is this a sign of a bad switch? Even if it ...
H: Running an integrated speaker amplifier board off DC? I found a pair of stereo speakers that come with an amplifier inside them. They do run on mains voltage as they plug into the wall but the actual amplifier runs on DC, 12V to be precise. There is even an unused port that says 12V DC, presumably for a wall adapte...
H: Values for calculating PN2222A Base Resistor I know that there are several posts in regard to calculating the base resistor of the PN2222A Transistor. Calculating the value in particular should not be a problem. My problem is in regard to finding the values for hFE, Vbe and Vce. The resistor is part of a small 12V ...
H: Delta total line current - Basic electricity problem I'm reading the book Basic Electricity from Milton Gussow and there's a problem that is driving me crazy, I'm not able to get the result. Can anyone provide me with a guideline to resolve it? This is the problem: Thanks. AI: This needs phasors because your motors...
H: HD44780 DDRAM and CGROM Interaction I am looking at interfacing to a HD44780 LCD display with an STM32VL discovery board. I am aware drivers exist but in the interest of learning I am doing it myself. I am curious about the interaction between the DDRAM, CGROM and CGRAM. In the HD44780 datasheet an example of writi...
H: How to position parts relative to each other in Kicad? Is it possible to automatically position parts in Kicad, relative to each other? I'm making a board that plugs into an Arduino Nano, and I'm finding it difficult to position the straight headers at the exact 17.76 mm span to match the space between Nano's pin r...
H: Calculating current in a series circuit Given the following circuit, it seems like we could use ohms law to conclude that current = voltage / resistance. With a source voltage of 3.3 and a resistance value of 220, current = 3.3 / 220 = .015 amps, however, after measuring the current with a multimeter, this value wa...
H: Dual Supply from single 24v dc source and 12v regulator I was thinking about different ways a dual supply could be created, and I was wondering if something along the lines of what I made in this schematic would work. I don't have any kind of formal education in this stuff so excuse me if there is some blatent thin...
H: Earth ground to dsub9 shell I have an enclosure containing an earth ground line. It has a brass earth ground bus that is connected to: the input earth pin of a 120V single-phase mains IEC320-C14 connector the output earth pin of a 120V single-phase NEMA 5-15R connector earth terminal for a self-contained SMPS with...
H: Replacing UPS of a CPU with whole home suppression (undervoltage) system I need a new UPS however the knowledge acquired in the last years is preventing me from getting one I live in a large city (127v), and voltages rarely go above 130v, however it has happened at least 3 times in the last couple years, that we d...
H: Construction of Peltier tiles I'm learning about the construction of Peltier tiles from Wikpedia. However, some of the statements in the article are not at all clear. Here's the extract: Two unique semiconductors, one n-type and one p-type, are used because they need to have different electron densities. The s...
H: Hack fibre optic transceiver for wireless data link I'm brainstorming ways to implement a high speed wireless laser data link without the exorbitant cost. Would it be possible to take a standard SFP transceiver module and use that across free space rather than through a fibre? In other words, to point two transcei...
H: Audible difference between "audio grade" capacitors in the same range? The following is a list of prices for some capacitors sold by Mundorf, a massively audiophile-approved component company. Each capacitor is within the same product range ("EVO"), and apart from some differences in max voltage and tolerance (450...
H: Meaning of USB 2.0 high-speed/full-speed device/host/OTG controller ...? In the datasheets of many MCUs, following are said about USB. "USB 2.0 high-speed/full-speed device/host/OTG controller with dedicated DMA, on-chip full-speed PHY and ULPI" I wonder what do the parts of the following term mean respectively? "h...
H: PWM controlled MOSFET based DC motor driver, stuck with reverseing direction See the circuit diagram below and help me to find the problem: I can drive the motor in one direction as expected and to reverse the direction I added a relay circuit. I used two SPDT relays instead of DPDT shown in diagram. But some times...
H: 12v Power adapter IC circuit design High voltage AC So this question is a follow up to my previous question. Here is the story. Few days ago, while installing a 12v LED strip, I found out that the 12v AC-DC power adapter actually carries a high voltage AC in it. My question was marked as duplicated, and the answer ...
H: What sealing type for cable/tube enter casing for outdoor use? I build an electronic device which is used outdoors. A bundle of cables enter the device in a small 30mm diameter tube. This tube should be sealed so no dust/water/moisture enters the casing. It should be possible to remove tube easily for maintenance w...
H: Could someone take a look at this Tinkercad file? So basically I'm using a 74HC595 shift-register to control 8 LEDs by manually giving the chip pulses with knobs instead of something like an arduino. On the arduino.stackexchange website this question got denied by users because it seemed to be off-topic. It was act...
H: DC biasing arrangement in this audio phase shifter circuit The circuit is composed of four phase shift opamp stages each with a JFET used as a variable resistor. Part of the circuit I do not understand is the DC biasing arrangement. I can see that it uses a 4.5V Zener diode to provide the 1/2 VCC supply as this cir...
H: Vacuum Tube Tesla Coil (VTTC) schematic interpretation I'm quite new to the Tesla Coil stuff and I want to build a VTTC form a GU-81 tube. I'm using schematics from this Instructable. I don't want to make anything I don't understand and although I understand basic Tesla Coil working principles there are some questi...
H: What is purpose of an Undervoltage Sensing Circuit? I am wondering what is the purpose of an IC such as the MC34064. Is it just to ensure a reset of microcontrollers upon power up or are there other reasons? I used to make a simple transistor switching circuit (with RC) for resetting microcontrollers in the old day...
H: Will shorting secondary winding of transformer cause damage? The transformer in question is a step up transformer, which converts 240 VAC @ 3.75 Amps to about 2100 VAC @ 0.4-0.5 Amps. (50 Hz) I want to test whether it works, it is salvaged anyways. If the secondary coil is shorted, would that cause any problems? I ...
H: What is the benefit of wrting OpAmp parameters as function of G and Gfc? This is a schematic for an oscillator. I am curious about how parameters are written as in the read box. I think G is the DC gain of the OpAmp. However, I am not sure what \$G_{fc}\$ is meant to be and why go we wrtite G as a function of \$G_{...
H: Lpc 43s50FET256 processor and its connections ı want to buy a nxp LPC43S50FET256 processor and ı made some research but I dont know whether lpc43s50 has already got bridge connections, ı also dont know for example whether ethernet is already connected or not I couldnt understand from the datasheet and there is not ...
H: What actually happens when both 1 input is given in RS flip flop circuit (physical change)? This question is somewhat similar to: Why is S=1, R=1 state forbidden in RS flip flop? But I am asking what actually happens if both 1 input is given forcefully in R and S terminal of flip flop circuit. Will there be any p...
H: Repairing Television in Protect-Mode My 5-year-old television (Philips 32pfl5405h/12) stopped working two weeks ago. It seems to be in protect mode as its standby LED keeps blinking three times. I pulled the plug and left it for a week - no changes. I therefore assume a resistor / capacitor is broken. As I have n...
H: Communication between two STMs over 2 meter with small latency I want to send messages back and forth between two STM32s. Probably STM32F407VET6, but it would be nice if I can try already something for a simple one (STM32F103C8T6). My requirements: round trip delay time: preferably 1 ms max (excluding processing),...
H: Soldering SMA to a Transceiver I'm a noob in Electronics. I want to use this module that doesn't have SMA or u-fl connector. my Question is how can I use SMA or u-fl connector with this kind of modules or how can I solder them the connectors? http://www.hoperf.com/rf_transceiver/lora/RFM95W.html AI: That link goes ...
H: Difference between i2c switch and i2c mux I am working on a project which involves reading from multiple IMU sensors on i2c protocol. They have a fixed i2c address and hence I feel the requirement of some sort of multiplexer. On some research, I found two components which appear to be doing same job. Here are the b...
H: Oscillator circuit operation confusion In this circuit and explanation, it all makes sense except I'm having a hard time picturing Q2 not turning on until C1 has discharged first. When C1 is discharging through Q1 why doesn't Q2 turn on as it's discharging since it's base is higher than 0.6v through R2? Also is C...
H: When a AM radio wave reaches the antenna does the signal need to be in a closed circuit to be amplified? This needs some explanation. In the diagrams of radio instructions I always see a single line from the antenna to the input for amplification. Let's use a vacuum tube amplifier as for example. There is a single...
H: How do large power supplies work? (VFD's etc.) I've looked at the designs of switching power supplies (buck/boost/buck-boost) and I basically understand how they work. But is this the same thing used in large power supplies such as those in the VFD of a tower crane (etc.)? Like the larger of the two hoist winches o...
H: Binary Weighted DAC I tried to do this question but do not understand what this graph is. I know it is a binary value for the D0,D1,D2,D3 inputs but what is the value ? And is this the correct formula for final Vout? $$ V_{out}= -(\frac{D3}{1}+\frac{D2}{2}+\frac{D1}{4}+\frac{D0}{8})*V_{in}*\frac{Rf}{R}$$ AI: While ...
H: Symbol for a potentiometer on a guitar amp layout diagram Was working to convert a guitar amp layout diagram to schematic and stumbled upon this component. Looks like a potentiometer but has some additional tabs on the front. The label reads "master". Anyone knows what I am dealing with? AI: That's a potentiometer...
H: Add two PWM to DC inputs I have an Arduino Mega and I'm following this PWM to Analog-Output page to create a constant DC output. If the max output for the PWM 5 volts, is there a way to put two of these circuits in series to make a DC out that is able to go from 0->10 Volts? If so, what would that look like? AI: T...
H: How can I modify this voltmeter circuit to show 0.00V when nothing connected to the output I have a voltmeter and ammeter combo which sense the voltage and the current at the output. My problem is when nothing connected to the output it shows 0.06V else 0.00V. I tried to connect the output the GND but the value is ...
H: Internal RC clock on Atmega329 accuracy I'm working on a project that uses a Atmega329 with a 2 digit lcd 7 segment display. It needs to keep track of days, using a small coin cell battery. I originally planned on using the on board clock, as the accuracy doesn't have to be great, I'm fine with a couple hours each...
H: Switching low power with transistor I'm looking to simulate click of a button (short circuit) on Android phone. I plan to use Arduino pro micro (5v) to trigger "the click". What kind of transistor should I use? Maybe there is some example scheme? Thanks! AI: If you're switching voltage is say 5V from the Ardui...
H: Radio antenna as WiFi My school is a technical school that used to make ham radio communications (AM, I think). The thing is, we have a huge antenna that isn't being used. So, could we use it as a WiFi antenna? AI: Almost certainly not. Every antenna has a range of frequencies it's designed to transmit and/or recei...
H: Basic questions regarding Push Pull stage I am confused as to how the following circuit will work(????) Lets assume that there is no AC signal and only a DC signal is applied. According to the books this is a voltage follower stage i.e Vo will be equal to Vi. But how is that possible? Both the transistors are alw...
H: Using an AC relay for DC switching, safe limits I have an relay that's rated for a 250VAC, 16A load. Would it be possible to also use the same relay for say a 25VDC, and less than 1A load? From here, relay power ratings - AC vs DC , it seems to imply that that due to arcing, an AC relay would be able to support swi...
H: Is it possible for (W/L) of 0.18nm PMOS to become 989100? Is it possible for (W/L) of 0.18nm PMOS to become 989100 ? If not,i wonder what the range is for (W/L) of TSMC 0.18nm PMOS and NMOS.Thanks a lot. AI: Theoretically you can make any W/L you want. But as the ratio gets higher you might want to look for alterna...
H: Android-Based Projector Remote Controller I am planning to create an android application which is a remote control for projector. The android application should do the following: Control the Focus Ring of the projector using Stepper Motor. Change the angular elevation of the projector. Position the projector up an...
H: L-Network impedance matching casual beginner electronics hobbyist here. I read an article online describing how to impedance match a resistive source impedance of 75 ohms to a resistive load impedance of 1k ohms. In order to accomplish this, the author of the article inserts what he calls an L-Network consisting of...
H: Is i2c the right protocol for this sensor? I have a project I'm working on that involves an nrf51822 communicating with the optical sensor from a mouse. The pinout of the opical sensor seems similar to the ADNS2620, but the exact datasheet is not available. The datasheet for the ADNS2620 seems to basically say (b...
H: Power supply and switching of relay? I have some trouble figuring out a power supply. I understand most parts of it, but have some doubts. Is D2 and D4 both zenerdiodes to get the wanted voltage at the output? And how does the switching of the transistors for the relay function? Thanks in advance! AI: Since this ...
H: How to switch power going to SD card? I am working on a project, where I need to switch ON and OFF power going to an SD card. What should I use? Can I use a BC547 as a switch? Will that help? Thanks AI: For this sort of situation, I usually go for the following circuit. simulate this circuit – Schematic created u...
H: What's the purpose of this resistor? What is the purpose of RIN in this schematic? AI: Marcus Müller was correct in the comments. I'm just rephrasing what he said here. As the chip uses low current at DC, the impedance of the source through \$R_{\text{IN}}\$ is small, and there is only a very small voltage drop ov...
H: Why can't a Wheatstone bridge measure resistance of very high value? The answer is from google but I don't get it. Can someone explain in more simple way? AI: You are mixing things up, the text talks about a galvanometer which is an electomechanical device which draws its power from the circuit in which it is used...
H: use transistor to switch on/off a window alarm basically I am follow the Schematic in this link- https://stackoverflow.com/questions/14833999/arduino-switch-control , I can get the transistor to switch on/off a motor, but now instead of a motor, I try to switch on/off a window alarm similar to this one https://ww...
H: Why do LEDs have only RGB (Red, Green, Blue) colors why not others? After some studies I've found LEDs having 3 colors RGB (Red, Green and Blue), I was very interested in this topic so this question is up. The Diagram will tell the colors in LEDs. > Red, Green and Blue color in LEDs Why only RGB is needed? Why c...
H: How many amperes without resistance? For the below circuit according to Ohm's law the led will get 23mA. What happens if the resistance is removed? How many amperes will the LED get? My assumption is that the wire has some kind of resistance as well...but how much ? Thanks AI: Current in that case would be (5- vol...
H: Trying to make a peak voltage adapter I'm trying to make a PVA using the following schematic: I have put something together that looks like: Obviously the input at the top will have positive lead going into the diode and the negative lead on the other side. Is this correct, I have little knowledge and not really ...
H: Filtering analog power supply I'm working on a project which runs off a 50V DC power supply. There is a high power H-bridge being switched at 250Khz powered straight of the 50V. There's also the analog control electronics running of 12V. The 12V has to be created from the main 50V supply. Like this: Obviously there...
H: What is the best preamplifier circuit for electret condenser microphone? I have one old German directional dynamic microphone "SEL BST 205-1" and I remove everything inside it and pack 2 condenser microphones from mobile phones "Nokia 5130". Like preamp I use this shematic: My problem is that any voice recorded vi...
H: Power Arduino Pro Micro from MCP2025 Vreg I'd like to power Arduino Pro Micro (5v) from MCP2025-500 LIN BUS transceiver. Can I connect MCP2025-500 Vreg pin directly to Arduino Pro Micro (5v) RAW pin? AI: No you can't connect to the RAW pin input if you want to run your MCU at 5 V. You need to connect to the UVVC i...
H: Guitar pedal effect voltage problem I'm building a big muff pi, here it is my schematic : I also made the PCB with smd components, and all the connections seem to be correct. I've plugged in the guitar but nothing happened, no sound at all. So, since I don't have an oscilloscope I decided to measure some voltages ...
H: Energy storage for AC inrush currents In DC circuits, if I have a device that gets switched on and has a large inrush current, I can just put a large charged capacitor near the power switch (parallel to the device) to source the surge. This protects the DC power supply from the inrush current and the DC source can ...