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H: '1011' Overlapping (Mealy) Sequence Detector in Verilog I'm designing a "1011" overlapping sequence detector,using Mealy Model in Verilog. The FSM that I'm trying to implement is as shown below :- Verilog Module :- `timescale 1ns / 1ps module seq_detector( input x,clk,reset, output reg z ); parameter S0 = 0 , S1...
H: How voltage and power transfer in cascaded amplifiers work? When there are three amplifiers that are cascaded to produce higher gain: The source resistance should be lower than input impedance of first amplifier The output impedance of first amplifier should be lower than input impedance of second amplifier The ou...
H: How to implement C language driver for SPI peripheral I have been implementing device driver for the SPI peripheral of the MCU in C language. I would like to exploit interrupt mechanism for reception and also for transmission. As far as the reception part I think that I can implement this via exposing the function ...
H: FM modulator LTspice I am designing an FM modulator circuit using Colpitts topology. Unfortunately I encountered difficulties and do not know how to solve them as I am new in electronics. Firstly I don't get a clean sine wave on ouput. Also, the FFT of the output differs from what is being expected - I get only one...
H: PCB Antenna Design Calculations I have read the basics of antenna theory and lectures. I just want some practical PCB antenna design & its calculations /design considerations so as to understand the design calculations better. Any PCB antenna design regardless of the frequency of the operation and the size will do....
H: Anyway to reduce pulse trigger time width without using ne555timer Is there any other way to reduce the time width of the trigger pulse wave without using 555timer? AI: Your comparator circuit is flawed because of this: - I've marked a red arrow showing what you have done wrong when using an op-amp with an AC sign...
H: '1011' Overlapping (Moore) Sequence Detector in Verilog I'm designing a "1011" overlapping sequence detector, using Moore Model in Verilog . The FSM that I am trying to implement is as shown below :- Verilog Module :- `timescale 1ns / 1ps module seq_detector( input x,clk,reset, output reg z ); parameter S0 = 0 ...
H: How to Find Thevenin's Voltage & Resistance? I've a hard time understanding Thevenin's theorem. I know that it is just a theorem to simplify a complex circuit, and to easily analyse that. My hard understanding is in the mathematics of it. Given this circuit, we'd take out the R2, because it is the load resistance,...
H: What is the purpose of this coil in a medical defibrillator? Please can someone explain the function of L coil in this circuit? This schematic is just medical defibrillator, but almost every capacitor discharge circuit has some series coil. Is it some kind current limiter? AI: The inductor is there to shape the wa...
H: Use of tin plating I have been researching about PCB development, and I came across the tin plating process. Consider the following scenario: I have created a PCB, covered it with solder mask, and I am now ready to solder the components on the PCB. That means that the only copper not covered by solder mask, will no...
H: POKO TD-169C Hair dryer circuit diagram Can I replace the 1N5395 diode in this diagram with a FR157 diode? Basically I need to lower the heat of my hair dryer and I think the 1N5395 diode in this diagram does exactly this but I have only a FR157 and also I read it's better to use 4 amps or even 6 amps diode like th...
H: How should I make an ECAD schematic for my RFID chip? I want to integrate a sensor component with an RFID chip. From the answers I have from this question. I decided I need to contact a PCBA house. I need to draw an ECAD schematic for the PCBA house (never done this before) . These are the components: RFID Chip; ...
H: What's the benefits to using analog-to-digital conversion like PCM? I was reading a textbook, Data Communications And Networking, by Behrouz A. Forouzan, which says: A digital signal is superior to an analog signal. The tendency today is to change an analog signal to digital data. I don't quite get it, how is a d...
H: P-MOS Selection for 12v application First off, let me state that I am pretty new to FETs, so I'm still wrapping my head around the different characteristics. The circuit below is a switch that will trigger a 12v (VIN=12v) signal to be constantly on, based on input from an MCU (MCU_TEL_ON=3.3v logic level). The DMP...
H: What is the meaning of this datasheet diameter notation? I am reading this datasheet and I want to drill the correct size hole into the board and I am confused what 5-ø1.2 means. I can't understand what the 5 and - sign mean? Your help would be greatly appreciated. AI: It means that there are 5 (quantity) of these...
H: Getting 12 V, 110 mA supply I am not too familiar in electronics, but I am currently using them for a Computer Science project. I am connecting an electromagnetic door lock to a SPDT relay, so that the door can stay on NC and then be opened when I power the coil. The problem is that I don't know how to to power the...
H: Buck Converter has minimum output current I was looking online for a buck converter and I came across this on eBay: https://www.ebay.co.uk/itm/DC-DC-5-40V-to-3-3V-5V-9V-12V-24V-Buck-Step-Down-Converter-Volt-Linear-Regulator/263325140035?hash=item3d4f66c443:g:hwgAAOSwJyhdg0ay What does it mean by a 1.5A minimum ou...
H: CD4053B Supply Voltage Ambigious in Datasheet I'm designing an analog voltage switcher based on the CD4053 and +-15V rails. By accident, I ordered the HEF4053 which clearly states that Vdd-Vee may not exceed 18V. Now I'm looking at the TI CD4053B datasheet where it states: Supply Voltage (V+ to V-, Voltages Referen...
H: Multiple output Flyback - Stacked transformer - Cross regulation - TL431 Suppose I have the following output stage of a flyback: simulate this circuit – Schematic created using CircuitLab The schematic is a bit simplified but the idea is here. Do not pay attetion to the values of the different components. They are...
H: Motion sensor to detect birds and small animals but ignore humans I would like to develop a motion activated sprinkler to deter birds (cranes and other smaller birds) and small animals from eating the fish in my pond. I am using the approach of controlling a solenoid valve via a PIR motion sensor. However, this mea...
H: Charging a protected 18650 cell I am new to electronics and just getting started with a project to make a BT speaker. I bought some quality protected 18650 Li-ion cells from Orbtronic. I would like to build a charger myself for these batteries using a 5V,3A wall adapter that I have. Most people use the TP4056 to ch...
H: If there is a cable and jack standard for I2C? I want to do a connection of multiple current and voltage meters, they connect by I2C. Is for to monitor solar panels and batteries, they will be a considerable distance from the master. I thinking use a 6P6C or RJ45 connectors for this. But first I want to know if the...
H: adder in binary addition: XOR instead of OR gate I am just a newbie starting out in electronics with no experience. Why do we need XOR and AND gate for the binary adder? is there any particular reason why only these two specific gates are needed and used? As I understand OR gate adds values (boolean algebra - X =...
H: Problem with SCR latching circuit I put this circuit together to demonstrate latching properties of SCRs but I'm finding that the SCR doesn't behave as I expected it to from the datasheet values. Specifically, I found that in the circuit as shown it will light when the switch is opened but not latch (i.e. it turns ...
H: What's the purpose of the capacitor in this circuit? If this trigger pulse is starting the process of sweep generation, seems to me like it would be going directly to the base of the transistor (Q701) to switch it on and off, so the series of multiple transistors downstream can do their thing to generate a nice bi...
H: What does the term 10GA CT-PT means for a CT-PT wiring? We have a MCC in our garage of commercial outlet facility. The bucket with the metering unit needs to be configured with the GE-PQM 2 (Power Quality Meter),and CTs and PTs are required to provide the signal to current and voltage inputs to the meter respective...
H: What is the purpose of this FPGA + microcontroller based motor driver design? I have used microcontrollers (Arduino, PIC, Atmel etc) so I am familiar with what they are and what they do (e.g I know about polling, interrupts and communication protocols like I2C, SPI, UART) but I have never used FPGAs before. So I do...
H: The memory regions I can write and cannot write to, ARM Cortex-M architecture I hope my title is correct terminologicaly. I am working(learning) with STM32F4 discovery board, which has an STM32F407VGTx microcontroller on it. I really try to find the answers in the reference manual, but sometimes it is really hard t...
H: Check If Arduino has FET I have read that Arduino can be powered by both 12v from dc jack and from USB as it is equipped with FET which takes power from only one input. At the same time I read that many people destroyed their arduino as they were not equipped with FET. How do I know if mine has one? Basically I wan...
H: ULN2803 behavior when its output is not connected to any load in this circuit? I'm studying the a circuit that is using a driver ULN2803 datashet. The driver is needed for external loads as LEDs when a pin is writing. The situation that I would like to talk about is when the pin is reading. As the GPIO interface is...
H: Find the energy stored in the capacitor For the circuit shown in the figure. Assume that the swich is closed at t = 0 Find the final energy stored in the capacitor? AI: The energy stored in a capacitor is equal to 1/2 * C * V² Find the steady state voltage (clue: at the steady state, the capacitor acts as an open c...
H: What is the best way to tap 12v from a 6x6v battery array for intermittent loads? Greetings beloved comrades, I recently acquired a 36v golf cart that has 6 6v batteries in series. The existing 12v accessories, mainly lights, are powered by a separate series connection to 2 of the 6v batteries. I don't like tappin...
H: Cortex M0 - Defining an interrupt routine in assembly For a project I have some code that needs to be written in assembly due to precise timing requirements. I'd ideally like to implement my code in a timer interrupt routine. Right now, in C++ I can define an ISR as such: extern "C" void TIM3_IRQHandler(void) { //c...
H: PCB Footprints: SOT-363: SC-88 vs SC-70 I'm currently designing a PCB. One of the ICs I need to use is stated as being a "SOT-363 (SC-88)" part. In KiCAD, there is a footprint for a "SOT-363_SC-70" part. What's the difference between an SC-88 and SC-70 footprint? I couldn't find a clear answer online. Would I be ok...
H: Tachometer IC that does not require zero-crossings? I recently built the basic tachometer circuit in this LM2917/LM2907 Datasheet shown below using the 8-Pin version of the device. I realize this circuit requires a VR pickup sensor, and so the LM2907/LM2917 must rely on triggering off of zero-crossings. But what if...
H: Low Source Voltage: Driving 2V LED with 1.8V Signal, 5V Supply I am trying to get a 2V LED to to turn on. The CARRIER_STB# signal is a 1.8V signal. I have a 5V supply connected to the drain. Below is a screenshot of my that part of my circuit. EN_3V3_1V8 has been disconnected for the purposes of testing, but will h...
H: Is there good inductor calculation software? What's a good software package for calculating all-around parameters related to inductors? Not necessarily simulating them, but just static analysis with common quantities of interest. I've used ELSIE, a version of which came with the ARRL Handbook at one time, but I'm...
H: What is 2 layerd circles component in this circuit? What is the 2 layered circles symbol in this circuit? What does it do? AI: That’s a 2-terminal current source.
H: op amps comparator or differential amplifier I have a part of electronic schematic as described bellow, I'm a little bit confusing about the function of the LM321 amplifier. In this case, can we say that is a differential amplifier or just a comparator (open loop, no feedback, cause of the PNP transistor)? I thank...
H: Recommended discharge current of coin cell I am thinking of using small coin cells to power white LEDs (20mA @ 3V FWD voltage). When I look at some coin cell specs sheets, I've seen "recommended discharge current" of only a few mA or less (e.g. >1mA or >3mA). If I choose a cell with 1mA recommended discharge curren...
H: How to drive high voltage transistor with low voltage op amp? I'm trying to drive a darlington pair with 24 V collector voltage with an low voltage op amp. I tried adding a PNP transistor so the op amp just have to drive that single transistor, but haven't had any luck. simulate this circuit – Schematic created us...
H: Why cap across shunt resistor, input bypass caps and small resistors on current sensing inputs? I want to build a sensitive current sensing circuit using shunt, and since I also repair MacBooks occasionally, I have some contact with the schematics of real working expensive devices (although whoever follows Louis Ro...
H: Question about symbol in front of MOSFET gate I have a question about a symbol in front of a MOSFET gate. The circuit that I am analyzing transforms almost ~311 V filtered and rectified DC to 48V DC. In images, I saw a symbol that is in green box. It looks like an inductor but there is no value on the schematic. I ...
H: MOSFET in LTspice sim conducts below the threshold voltage Electronics noob here! I'm trying to create a circuit that feeds the output of a piezo transducer into a comparator, in order bring an arduino pin high when the piezo's output exceeds the comparator's reference voltage. The annoying thing with this is that ...
H: Is this a battery holder or what? I am loaned a prototype of an industrial device (running some Linux with an Android flavor). Each time I turn it off, it loses time, and I need to connect it to some Ethernet network then login by SSH to adjust it. The thing is going on tour for a demo (we make the application,) ...
H: Can someone help me establishing the polarity of this dc jack on my laptop motherboard? So my laptop charger port is fried and I wanted to establish the polarity of the points on the board so I can solder a off the shelf jack instead of the original one which is not available anymore. I will use the original charge...
H: Is there a minimum length for SATA cables? Today I stumbled across a piece of information that surprised me. Apparently there is a minimum cable length for SATA. From Seagate, a reputable manufacturer of SATA devices: Serial ATA (SATA) data cable lengths Serial ATA cables are available in many lengths up to 1 mete...
H: How to identify transformer pin out in genuine mobile charger? can't find any information about it on Internet ,does there any practical procedure to identify, like removing it from circuit and measuring its coils resistance. or a website that i can find information about it.as i think it is sort of fly-back osci...
H: ESP32. - selecting resistors for voltage divider I'm using an ESP32 with a 12V battery and solar panel. I've created a voltage divider for 0-15v (3.3v input to MCU at 15v at battery side). For that I used a 100kOhm , and 300kOhm to get a 0.3 ratio. For measuring purposes, result measured is close enough (0.1v erro...
H: My simulated coax cut off frequency is way far off the calculated value I used the lumped model to model a coax cable as a low pass filter in MATLAB. I also included ESR which is supposed to resemble the dielectric losses. I derived my transfer function from the circuit below. I used voltage division to get my tran...
H: Parallel resistors circuit analysis question I started by combining resistors in parallel so instead of 4k and 12k I can get 3k but then as the independent current source exists in the middle confuses me what to do next. Can someone guide me through? AI: It often helps a lot to just re-draw the schematic: simulate...
H: Art of Electronics 2.5 - Transistor saturation With reference to the image below the text says When the switch is closed, the base rises to 0.6 V (base– emitter diode is in forward conduction). The drop across the base resistor is 9.4 V, so the base current is 9.4 mA. Blind application of Rule 4 gives IC = 940 mA ...
H: Suggestions for TDA2030 Audio Amplifier Please suggest any ways to improve punch or bass of the sound for the following audio amplifier using TDA2030A. The sound output of the amplifier lacks some bass. Can I use TDA2050 to improve sound quality? I am driving a 5W 8ohms speaker. Note: This is not a subwoofer circui...
H: Mono to stereo circuit only if one cable is plugged in Im not sure how to phrase my question or what to google, but does anyone know how this feature is implemented (eg a simple example circuit): On some audio mixers, if only the left channel is plugged in, the audio from this input will be split across the left an...
H: Can I solder two USB cables together? I've got two USB computer mice, one with a defect click button and one with a defect USB plug. Would there any issue if I simply cut them open and soldered together the mouse part of one with the USB plug from the other? Or the USB plug from any old USB cable, for that matter. ...
H: Low Power SPI Module communication between Microcontrollers I have 2 microcontrollers - one is S32K118 and other is S32K142. Both are 64 pins. S32K1xx datasheet I need communication between the Microcontrollers in SPI Configuration. Suppose the microcontroller supports 2 LPSPI modules, say LPSPI0, LPSPI1, LPSPI2. F...
H: Are passive piezo speaker more reliable than magnetic ones? I'm going to use sound notification in my desing (just beeping). My buzzer needs to be suited for cold ambient conditions (up to 0 celcius degrees), high humidity and shocks. Which buzzer type will be more aproperiate? Is it true that piezo buzzers are mor...
H: how to solve the phase shift of a ne555 timer Why is the first pulse wave is not the same as the rest of the wave in this 555 timer? Is there any way to remove the wave before 2 ms or is there anyway to make it same as the rest in the graph. AI: This likely only happens at the power-on situation because the capaci...
H: What happens to the steady state of the series RC circuit if changes happen to any circuit element? The question that I'm trying to understand is the following: In any series RC circuit that is in steady state, WHEN any of the elements changes (R, C, or applied voltage), the following will happen to the circuit: (...
H: Analog 0...10V signal splitting I've been trying to solve a problem, but a few days of searching has yielded nothing, and I'm inexperienced to create my own electronic circuit. First, let me explain the problem. We use data acquired (hijacked) with the monitor in our control loop to send setpoints to the source who...
H: Switch "On"/"Off" RS485 data lines i'm doing some researches about how to close/open RS485 data line in my RS485 multi device bus. I'm following this nice research-document: Link Here. Basically i'm thinking how to solve this problem in a real-world environment, as you can see in page 43, the strategy is very simpl...
H: A quetion about how an electric shock game works can someone explain to me why does the current pass through his hands? why doesn't it pass only through the aluminum since electricity always chooses the easiest path? https://www.youtube.com/watch?v=7QIcdQPwLmg&t=331s AI: We see later on in the video a clearer view ...
H: Colpitts Oscillator Issue how are you all doing? I have been experimenting with the Colpitts Oscillator and encountered a minor issue that I would like to resolve. Here are the two circuits - the first one is working flawlessly, while the second one isn't. Notice that the BJT biasing is exactly the same for the bot...
H: PCB Layout Help (with schematics!) - Split ground plane or not? Obligatory "not an EE, just a ChemE trying to make some pressure readings for science"! Schematic attached, along with my current layout. It's a 6-channel pressure sensor using MPX4115AP sensors and an AD7606-6 simultaneous sampling ADC. The ADC is ove...
H: Safe LED Operating Current What current is best, longevity wise, to run an LED at? For example in the below data sheet, an RGB LED from sparkfun, the absolute current limit is listed as 20ma. However running an LED at 20ma or close to it is likely to degrade that LED an an accelerated rate, correct? If I want to ac...
H: Hartley oscillator with ua741 amp in pspice I'm trying to simulate a hartley oscillator in Pspice using an ua741 amp. The results are not oscillations..I don't understand what's the problem.. AI: This is more or less the circuit you should consider if you were designing a COLPITTS oscillator: - Note that R3 is ne...
H: BU2505FV - Can I use SPI with this part? I am planning to use the BU2505FV DAC in my design and to communicate with it using SPI. Is the 3 Wire interface described in the datasheet compatible with SPI? The DAC expect 14 bits to configure an output, and my Microcontroller SPI can send only bytes (8 bits per byte). ...
H: How to hook up a fan to this switching circuit I am trying to build a controlable fan with a raspberry pi and I have found the below circuit for a switching circuit to allow the 12V power to go to the fan My question is how do I then hook the fan up to this for it to recieve the 12V power. Am I missing something? ...
H: Can I estimate the leakage inductance of a power transformer taken from a catalogue? I'm using PLECS to simulate an HVDC system and I've been using two ideal transformers (Y/Y & Y/D) in order to get a 12-pulse rectification. However, now I want to consider real parameters. PLECS gives me this box to replace leakage...
H: Using a lower voltage for a replacement fuse I need to replace a blown fuse in my Tacklife DM02A multimeter. It says on the back of the multimeter that the blown fuse is F1 250mA 600VAC. Its size is 5mm x 20mm and it has to fit into a clip inside the multimeter. I think it is ceramic because it is not see through. ...
H: Trying to analyze the audio attenuation.. Is this analysis correct? I am learning about impedance. So sorry any stupid question here... Consider this circuit: I have an audio input, from 20 to 20 kHz. I want to know how the AC voltage over AB will behave as the frequency increases from 20 to 20 kHz. If my math is ...
H: Different footprints for different surface mount Resistor packaging? When using the same surface mount package size (0402) for all my resistors on a board, but using resistors from different manufacturers or with different resistance values, should I create a different footprint for each manufacturer? In other word...
H: Build circuit from a formula I've this formula: y = AB + AB'C + A'C I've to build a circuit with only a 2:1 mux and a OR port. I've done the truth table and k.map, but i've not idea how proced. EDIT: @jonk Thanks for your time and for an exaustive and complete answer. It's very usefull! Atm i've done this: Y = AB...
H: Doubt about USB bus powered device I want to improve my project to be more robust, because it needs to be available 24 hours a day. Initially, my design had one microcontroller and a USB (FT232R) interface. The FT232 is 5V powered and my microcontroller is 3.3V. I was using an external regulator to supply power to ...
H: How do USB hubs work when same device is connected I was reading on how USB hubs work and since there is only 1 master, master sends a command to an endpoint. However, how does a USB hub work when there are 2 same devices plugged into a USB hub? How does the device know which is being addressed? AI: USB has a proce...
H: Is it possible to use a digital potentiometer as a digital rheostat? With a three-terminal analog pot, you can use the middle and one of the outer terminals for it to function as a rheostat. As it happens, I need a digital rheostat in my circuit but I only have digipots on hand: an MCP4151 and an MAX5481. Since thi...
H: Need help analyzing a circuit? so basically i ran on this schematic , an led Color Organ from Circuit Skills. Now following the explanation of the circuit i pretty much understand the basic principle of it. However i have some problems figuring out about two things(I am an entry level Electronics hobbyist, so sorry...
H: VGA cable arcing against computer case I've tried to turn on my old PC with my old LCD monitor, which is powered by a kettle cable directly from mains, no power supply brick). When trying to get it to work, I have noticed the following phenomena: 1) The VGA connector from the monitor produces electrical sparks agai...
H: Circuit's power budget and power dissaption I'm a designing a circuit that I'll prototype soon. I'm curious about how should I determine my power budget for the circuit? Could you guys please suggest me how to do it? Should I calculate each power rail Watt and sum it? Do you have any suggestions for 'excel' table f...
H: How do I swap two layers in altium? I have two inner layers in altium for a flex cable, I want to swap one copper layer with the other without having to delete or copy everything. Is there a way to swap two PCB layers while maintaining everything on that layer? AI: The easy way is to just tell the board shop what o...
H: Can I replace a NIMH rechargeable pack with a resistor if I only want to run plugged in? My kids have a pair of IKEA night lights ("spoka") where the internal battery packs have died. I'm debating replacing the batteries (3x AAA NIMH, marked 3.6V so in series) and have looked at this answer but since we've pretty ...
H: What symbol to use for a solid state relay in a schematic? What symbol should I use to indicate a solid state relay in a schematic? The internal schematic of the solid state relay is shown in the data sheet, but showing all of the internal components in the schematic is not necessary and would be more confusing tha...
H: What is the difference between usb root hub and usb host controller? From the oracle wiki (usb controller): The USB host controller has an embedded hub called the root hub. The ports that are visible at the system's back panel are the ports of the root hub. What I understand from this is that the root hub me...
H: Why are computer PSUs so large and heavy whereas phone chargers weigh barely anything anymore? I've noticed that phone chargers have gotten a lot smaller and lighter over the years, to the point where they weigh barely anything. The power supplies that you put in a PC still weigh 2kg. What prevents the improvements...
H: What is the time derivative at t=0 for a second order low-pass step response? For a first order system like an RC filter you have something like $$y(t)=1-e^{-\frac{t}{\tau}}\\ y'(t)=\frac{1}{\tau}e^{-\frac{t}{\tau}}\\ y'(0)=\frac{1}{\tau}$$ But for a second order system there are 4 different cases. What I'm intere...
H: Connection between std_logic and std_logic_vector(0 downto 0) I am trying to connect one of my VHDL blocks to a Xilinx generated block (a dual port RAM). The problem is that the write enable of the RAM is defined as an std_logic_vector(0 down to 0) instead as a std_logic and I do not know how to connect them. The ...
H: why does current like circulating? why does the current in R2 remain always zero regardless the value of other parameters(V1,V2,R1,R3)?) AI: This is more a physics question, not normal electronics. OP question is probably caused by a common physics misconception: "Current" is not conserved. Current isn't substa...
H: Electronic metronome Wien oscillator I've got to analyze an electronic metronome schematic and I'm having trouble understanding how the oscillator in this schematic really works. I believe it's a Wien oscillator with variable output wave frequency. Diodes in negative feedback loop are used for amplitude stabilizati...
H: Why does this H-bridge have PWM and Enable pins? The BTS7960 H-brige has 6 pins (excluding current warning pins). Right Turn PWM Left Turn PWM Right Turn Enable Left Turn Enable VCC GND I usually connect all the "Enable" pins to HIGH and only use the PWM pins to control the motor speed and direction. That works ...
H: Some questions about the emitter resistor added to the fixed bias circuit In many texts it is mentioned that the emitter resistor stabilizes the bias circuit. For example particularly for the below example: Which quantity is aimed to be stabilized initially? Vbe? And how does adding Re archives this? Can you give...
H: DRV8830 motor controller -- drive is working but brake is not DRV8830 datasheet (control register info around page 11). I have gotten this chip to run a motor with the following code: void drive(int speed) { // Write to the Fault Register to reset it Wire.beginTransmission(MOTORA_WRITE); Wire.write(FAULT_addr...
H: Problems understanding I2C pullup calculation I have been trying to read about I2C pullups such that I can select an appropriate pullup resistor for an EEPROM (24LC02B-I/P) which I want to use as serial ROM to drive some 7-segment displays. Despite the advice in this 'AddOhms' video I still am curious about how you...
H: KiCad Circle Dimensions Bit of a newbie to KiCad. Trying to get two edge cut circles, one with a diameter of 50mm and an inner one with a diameter of 40mm. Here is my settings for the 50mm one (using 25mm as I assumed this was the radius measurement): However this produces a circle with a diameter of 70mm. The sam...
H: Breadboard connections I am new to breadboard electronics projects. I am looking to do this project but am a bit lost on what all I need parts wise. This is my current parts list: WAV Trigger Breadboard 1n914 diode 6N138 optoisolator 2 Resistors 3 M/F Jumper cables Midi Cable 2 Ports Are these correct? What resis...
H: Determine transconductance of a JFET given only voltage gain and internal drain resistance I have a homework question as follows: If a JFET having a specified value of rd=100 kΩ has an ideal voltage gain of Av(FET) = -200, what is the value of gm ? As far as I know, the closest formula for gm relating Av and rd is ...
H: Bypass button press on fan for direct power on when plugged in I have a fan that I want to plug into a thermostatically controlled power outlet so that the fan comes on when the temperature reading reaches a certain set point. The fan is currently wired through an on/off switch which also included a switch for a m...
H: The Art of Electronics 1.35 Forgive me if this is not the proper question format. Please critique it if not. I am new to this site. I am reading "The Art of Electronics" and cannot understand the jump made in equation 1.35 to go to from \$V_{out} = \frac{R}{[(R^2 + (1/\omega^2C^2))]^{1/2}}V_{in}\$ to \$V_{out} ...
H: How to make active buzzer louder I have an active buzzer connected to an Arduino and everything works fine but the buzzer is just not loud enough. I don't know any specs about the buzzer but I've tried connecting it to a 9v battery using a transistor with the collector connected to +9v, the base connected to the di...
H: Questions about the circuit of the Arduino Micro So I'm looking at the schematics of the Arduino Micro and I have a few questions. On their website, Arduino claims that: The Micro can be powered via the micro USB connection or with an external power supply. The power source is selected automatically. I'm lookin...
H: esp8266 doesn't work when connected to same supply as relays The problem: Circuit one (with Arduino Nano) did work fine. I used a separate power supply (5V wall wart) for it, because I didn't think that the on board regulator could handle 12V. Circuit two (with NodeMCU) does not work - either does not turn on, rela...