Datasets:
Alignment-Lab-AI
/
StackStore

Dataset card Data Studio Files
xet
 Community
1
text
stringlengths
83
79.5k
H: MOSFET Diode design I'll start this off by simply saying I am not an Electrical Engineer. I am, however, an embedded programmer who has had some experience with circuit design and setup (give me 1's and 0's and I can make them dance...but Analog is black magic...). Some background that might help understand what's...
H: Boost converter drops voltage to 0 V when activated. I have built an automatic watering system using an Arduino board and a boost converter for powering the 5V DC pump (1-3W), but I have a problem. Each time the pump is activated, the DC-DC converter (bough from here) shows that the voltage drops to 0V, although th...
H: Understanding OpAmps in TINA simulation I have a hard time to understand why two different opamps in a substractor configuration deliver highly different output in a TINA simulation. At the end I try to implement a high impedance differential aplifier (instrumentation amplifier), which second stage is a subtractor,...
H: Power amp element's purpose From 100 watts OTL amplifier circuit using transistor MJ15003-MJ15004: What is the purpose of C5 capacitor? Why are there 3 diodes used? Not 4? AI: I'm not convinced the DC bias is stable or even centered at 45V out but C5 is definitely a Bootstrap Cap to shunt the AC current across R12...
H: What type of transformer should I use to convert 24VAC to 12VAC (or vice versa)? I'm working on a project that combines a board from an electric organ with one of those cheap Chinese tube amps. The board requires +12V/-15V DC and the amp requires 12VAC. I don't want to power the final product with two wall warts, b...
H: MOSFET for directly switching 24 Volt loads - any reason not to use the IRL8743PBF? I am searching for the best solution for using a Raspberry Pi 3 to control a 24 Volt load at modest amperage. It seems like the best choice is the IRL8743PBF because it can be switched to fully-conductive by a 3.3 Volt logic signa...
H: Can you short out a current source? I know that you can short out a voltage source by placing a wire in parallel with it so all the current the source drives goes to the wire instead of to another branch with a resistor. But can you short out a current source? I never saw my professor do it. For example, can you g...
H: Sign across resistor, circuit with diodes and fuse Okay, so I had shown with arrows the signage in question, shouldn't it be other way? Otherwise KVL $$ V_s = I_{fuse} (50) + 1.4 \color{red}{+} I_{fuse} R_{L} $$ isn't correct... Also, in the problem, $ I_{fuse} $ shouldn't exceed 0.1 A, otherwise fuse will "blow"....
H: 13Bit Encoder interface for microcontroller I am running out of time and seeking a proper solution. What I am willing to achive is getting the position of the encoder / motor shaft. To keep track of the movement. (Currently I am running 10 turn pots, but hey are going to wear out eventually and if there is a built ...
H: Ethernet to SPI converter Differential line importance? I hope someone can shed some light in this, I am laying out a Ethernet to PI zero HAT and will be using the enc28j60 controller from microchip. People have reported getting 2.8mbps up and down speed on average with cheap modules form china with same chip. My ...
H: ORing 2 power supplies for 3.3V output Is it possible to add two independent power supplies together to achieve a steady 3.3V powers supply? One power supply will be running from a 9V battery and the other is a 12V source. They both don't have to necessarily run together i.e. the if the 9V battery is just connected...
H: Amplify PWM signal from 0-5V to 0-10V I'm trying to amplify my PWM signal from 0-5V to 0-10V. As the nature of my project is a flyback converter, I thought that using a logic level mosfet with gate inputs from Arduino was enough to switch it but I was proven wrong. I've got a pwm from china on the way but it is onl...
H: How do I figure out the voltages at these 3 nodes of a circuit? To start, imagine the branch containing the current source as a node, a point currents flow in and out of. This gives us: $$i_3+i_4-i_1-i_2=12mA$$. We also know by summing all currents flowing in and out of Node1 that: $$-i_1-i_2=12mA$$. From these 2...
H: Solar cell power output comparison without MPPT I am interested in measuring the relative power output of a solar cell when it is placed behind glass and other materials. For example, one might guess that the cell's power output is reduced by 70% when placed behind frosted glass. One thought I had to measure this w...
H: TPS56221 Open Drain PGOOD The datasheet says the PGOOD signal is open drain but I want to use a 3.3V microcontroller to read PGOOD with the internal pulldown resistor, when PGOOD is asserted - will the voltage at the pin be 12V (my input voltage to the TPS56221)? The example design in the datasheet has PGD tied to...
H: Do NRF24L01 modules have to use the same SCK-Frequency to work together? I have two Atmega 328p Microcontrollers connected to NRF24l01 modules. The first one uses a SCK-Frequency of 2Mhz and the second one a SCK-Frequency of 4Mhz. Sadly the Connection doesn't seem to be working. Do both modules have to use the sam...
H: PNP Transistor to switch between Voltage Regulation and Battery Charging I am relatively new to circuit design and would appreciate your feedback on this :) I am designing a power supply circuit that uses the TI TPS61030 voltage regulator. It features a 4A internal switch connected to ENBL. The regulator is ON if E...
H: What does "a 40 kHz wave modulate with a 1 kHz sound" mean? what is mean when say "a 40 kHz wave modulate with a 1 kHz sound"? which of AM or FM Modulation means? AI: Figure 1. An audio signal (top) may be carried by a carrier signal using AM or FM methods. Source: Wikipedia. In electronics and telecommunications,...
H: Linear vs. Switching Regulators I'm trying to choose a voltage regulator, and considering I will have a relay on my PCB it seems a switching regulator is the better choice for the coil noise. Example Reference I found a lot of schematic examples over the internet, and a lots use a switching regulator when have rel...
H: Two Stage Amplifier Circuit Analysis Q I'm trying to analyze the below circuit. It's a textbook problem (Malvino's Electronic Principles) and the answer is given in the back (8966), but I am unable to reach that answer or approximation. The goal is to figure out what is the total voltage amplification of the below...
H: Some questions about BJT in saturation region In below circuit I sweep Vb from zero to 5V Vcc. And I obtain the following plots for the currents: I have a bit problem with understanding two things in saturation region: 1-) Why/how does the Ic decreases with Vb after the saturation point? 2-) How can I quantify/for...
H: Running a surround system on a 12V battery Hello all engineers. I've recently started a portable music box project. For someone like me with very limited knowledge about electronics I got what seemed like a brilliant idea. I've got several sound systems laying around. They're all functioning perfectly when connecte...
H: Are there types of standard coaxial cable with a propagation velocity of 0.9c? What would be the application? Reading this answer I was surprised to hear that there are "excellent" kinds of coaxial cable with a propagation speed of 0.9c; 90% the speed of light. The bargain basement number is about 2/3c, and coaxial...
H: How to view and customize beta of a transistor in LTspice If I need to set beta to a custom value, is it possible to make a customized transistor with a beta of my choice? In other words, can I edit a ready or generic transistor's beta and save it as a custom transistor? How can I do that? AI: The other answers are...
H: Motion-detection alarm - how to make alarm persist? This is a basic question. I have a motion-detector, but when it detects motion I don't think the output voltage persists. So it can trigger my transistor to trigger a buzzer I have, but after the motion passes all the voltages would die back down and the buzzer wo...
H: Transimpedance amplifier circuit for water conductivity I'm trying to understand the application of the water electrical conductivity measurement circuits based on transimpedance amplifier. Here the picture of general TIA configuration And here what I'm talking about In the second picture, the op-amp is feeded wi...
H: Do LEDs require more power to function as they age? I have a strange issue with the LED backlights of the LCD monitor i'm using. I have had it for about 5 years and up until this time have run it at only 10% brightness to reduce eye strain. However recently I have had an issue where some of the LEDs that make up th...
H: Is there a way to save state in a very low power way? I basically want to determine if power has been totally disconnected in a low power device I am making that uses an Atmega328 chip. The theory is that when power gets first applied the ATmega will power up, calibrate and take some readings then power down again....
H: I got two different results for the current in one branch, what is wrong with my KVL equations? The two circuits are equivalent. Using Kirchoff Voltage Law.(KVL) For Loop1, I have: $$12+3000i_1+2000(i_1+1)=0$$. For Loop2, I have: $$5000i_2+2000(i_2-1)=0$$. Now, there are two ways to find the current in the middle...
H: Is connecting a grounding rod to the positive side of a battery wrong? I have a 12 V battery being charged by a wind generator. The installation instructions show the grounding rod on the negative side. I have been having power issues with the batteries draining to quickly. When trying to troubleshoot the issue, I...
H: Incomprehensible high level interrupt behaviour I am a newbie and trying understand how high level interrupts are handled by a microcontroller. I am using a LPC1347 with Cortex M3 CPU. I understand how edge interrupts works but level interrupts has unexpected behaviours. Until now I thought that a level interrupt i...
H: What do they mean by "short-circuited" here? "Short-circuit inductance is the inductance when one of the primary winding or the secondary winding of the transformer is short-circuited and measured from the other winding." I can't understand the part of the sentence in italic. What do they mean by "short-circuited" ...
H: How can find the voltages at 2 nodes with 1 equations and 2 variables? simulate this circuit – Schematic created using CircuitLab At node 1, we have:$$0.001+i_1-i_4-i_5=0$$. At node 2, we have: $$i_4+i_5+i_2=0$$. $$i_1=\frac{0-V_1}{1000}=\frac{-V_x}{1000}$$(Vx is the voltage across R2) $$i_2=\frac{0-V_2}{6000}$$ $...
H: Controlling a circuit through a cat5 cable What I am trying to do is to digitally send a signal through a cat5 cable. I wan't to send it digitally so people can't just come along and put a voltage on the wires to activate the circuit. I would like the signal to come from the main control board. Thanks. AI: Dependin...
H: Pair of single test lead wires to solder type barrel plug: how do I strain relief the connection? My plans for power supply test leads have me wanting to have at least one set of leads that has 2x bananas on one end and a barrel plug on the other to allow me to plug in prototype PCBs without having to fuss around w...
H: STM32F4 Shorting Out I had some trouble with home assembly of some PCBAs. I've got an STM32F411xC (datasheet here). Anyway, After reworking it a bit, and some issues elsewhere on the board were uncovered (all related to oversights with soldering technique), the first board was toast...Missing pads and so on.. So, ...
H: Question on flip-flops I came across a question which says the following,i don't understand the question and how to come up with a solution In fig,the data word to be stored is S=1001 a)If LOAD is LOW,what does Q equal after the positive clock edge? a)If LOAD is HIGH,what does Q equal after the positive clock edge?...
H: 2-input CMOS NOR gate circuit operation Someone please explain to me how the circuit below operates as NOR gate. I have created a truth table next the diagram based on my understanding of basic MOSFET switching. For the output to be equal to Vdd, transistors Q1 and Q2 should be conducting while Q3 and Q4 must be no...
H: Vibration motors burning out under PWM control I have 16 dc vibration motors bought from Ali, rated at 0.1A, Vdc 3-9v. In fact they consumed 0.15-0.18A from 9V. Starting resistance varied from 20 to 30 ohms. I connected all 16 motors to PCA9685 16-channel pwm controller that runs at 1.6 kHz. I have 8 identical pcb ...
H: MOSFET trio/quartet viable option? I need to supply 10-15A at variable voltage without anything getting too hot. Is it good practice to use several MOSFETs to handle larger currents? I am currently using an IRF9630 P-FET with an Rds_ON of 0.5-0.8 ohms, but will likely use something better for my finished device. ...
H: Multiple buttons connected to reset pin I'm building a battery powered device based on ESP8266. There are few buttons (lets say 4 at the moment). After pushing any of them ESP should perform some action and go to deep sleep mode. Next press of any of these buttons should wake ESP up so it can perform another action...
H: AC RMS current measurements with oscilloscope I am going to measure the AC current(three phases), with a current probe, of a large machine, with an oscilloscope. The scope I am using has the following two options: RMS: RMS (Root Mean Square) value of the voltage of the complete displayed waveform. AC: RMS value of...
H: Soldering question Yesterday I soldered quite some things, but I'm still a beginner. I noticed that sometimes it happened that sometimes I use to much solder. When trying to remove it, I heat the pin with solder so it melts, and when pulling back to clean the tip to remove the excessive solder, I notice that the re...
H: Battery balancing circuit I am facing the following problem. I need to power my device (RC airplane) with 2 separate battery packs 12 V each in order to extend the capacity. Connecting them in series will not work, as the power stage is not prepared for that. When I connect 2 battery packs in parallel, and there is...
H: Inverse formula for parallel resistance I'm currently trying to get a 200kΩ resistance from scrapped materials or new ones but there's a limited range. (There isn't a good supply of components in my city and we can't spare too much time at the moment) Is there any inverse formula to get the combinations of resistor...
H: Can I approximate an "intelligent charger" just by charging one battery at a time? There seem to be two main classes of domestic battery chargers - "intelligent" chargers which charge batteries individually, until some measurement(s) of the batteries determine that charging should cease, and dumb chargers which cha...
H: Why don't three-phase transformers use toroidal cores? When looking at different transformer core designs, three phased, I never see any core designed as a circle or torus. Why is that so? Will it not work as well as the common B-shaped core? AI: Three coils, in magnetic series as you've drawn them, will not make ...
H: Series MOSFET switch I am trying to construct a simple MOSFET switch to control the input line of a linear regulator, but I am quite baffled as to how this works from the simulation I have done. The pulse input simulates a microcontroller drive, and I've simulated the input impedance of the regulator with a big re...
H: Dirty electricity In the book "Elon Musk: Tesla, SpaceX, and the Quest for a Fantastic Future" by Ashlee Vance it is mentioned that at Elon's house there was a problem with "dirty electricity" that was causing devices to overheat. I've experienced this in a variety of places with my own devices. In one case, while ...
H: Is it posible to use AM/FM antenna as GPS antenna? Having installed a tablet (Nexus 7) in the car dashboard, the GPS receiving signal seems to be too weak (specially in places with lots of buildings/trees around). So I thought about opening the tablet and connect the built-in GPS antenna contact points in the SoC w...
H: Will the fuse blow for long time use? I have a small pump rating at 96 Watt, and the input is 12V DC, max current 8A. The product also comes with a 250V 8A glass fuse. Because the pump is 8A and the fuse is also 8A, does that mean the device will draw 8A current flowing through fuse when working on full loading. Wi...
H: Providing power to MCU I have an ESP32 that I want to power from an external source. It's a dev board and have an USB input for programming and 5V, but moving past my prototype, I want to ditch the USB (I have a separate power supply board that will power two MCUs) The Arduino boards have a vIN pin for this purpose...
H: Relay replacement for my UPS - compatibility confirmation I've got a UPS that stopped working and found out the relays(Bestar) got busted. I would like to confirm this replacement relay(Songle) I've found online if it is going to work. I'm open to any comments or suggestions. By the way the UPS uses three relays. A...
H: Li-ion TP4056 with protection, avoid voltage drop at the output I have checked some behaviour in TP4056 boards (with protection circuit) that I don't like at all. (See schematic diagrams at the end.) When you use the TP4056 module with the protection board, you will get a dropout voltage of 0.4 - 0.7V in the output...
H: 2 DC motors connected in parallel to H-bridge move with different speed First of, since I come from web programming world, I'm pretty new into electronics and maybe some of the things I'm doing are wrong or could be done better, so any hint is highly appreciated. I'm building a robot/crawler with 4 wheels. Each whe...
H: A question about using active filter to mitigate both differential and common mode noise There is a single ended floating source connected to a data-acquisition device. The system is categorized as single ended earth grounded. Here is the recommended wiring as I use: Now imagine the source is unbalanced and causin...
H: Using TLE2426 as opamp rails supplies I want to power two opamp rails with +-12V. For that I want to use this component to obtain +/-12V split supply from a 24V single supply. But I came across the following statement: TLE2426 splits the opamp rails and references signal ground but not output ground. What does ...
H: Current Probe on CRO? Is it possible to measure waveform of current with current probe connected to analog oscilloscope? Or is that possible only with digital oscilloscope? Are there any other instruments out there that can display waveform of measured current? AI: Yes, current probes are commonly used and have 'sc...
H: Charge a 200v capacitor to 200V with a 5V Power Supply If for example I have a 200VDC capacitor and I need to fully charge it to 200VDC. Can I do so with a 5VDC power supply and if I can how would I do this? AI: One way I can think of is: Use the 5 VDC power supply to build an oscillator. Step up the resultant AC ...
H: Help with 16:1 Mux IC Wiring I have these ICs and I want to wire them like the sparkfun 16:1 mux breakout board. Here is what I have so far. Is this correct? However I feel like these are not the same as the actual ICs. Also another quick question, how many of Mux can I daisy chain? Thanks in advance :D AI: Here...
H: Questions about clamp meters Are clamp meters as accurate as multimeters? Could I replace a multimeter with a clamp meter? What can clamp meters do that multimeters can't? What can multimeters do that clamp meters cant? AI: Clamp meters are good for measuring higher currents. Standard multimeters can typically m...
H: Better procedure for 'recovering'an STM32F103C8T6? I have a STM32F103C8T6 (aka blue pill) and worked with it. Sometimes - due a reason I don't understand - after debugging it (using Eclipse), the connection is lost and I cannot start a new debug session. The only thing to do is the following time consuming procedur...
H: Help understanding voltage limits in a PNP transistor As seen below, I have a circuit that turns on +12V to the EN pin of a LM53601 buck converter when the +6V DC component in a car speaker wire is detected (bridged output). This works fine. But I am a bit confused when reading the specifications for the PNP and I ...
H: Understanding time-response of photodiode circuit (LTspice) I'm trying to get an idea of the time response of a laser-gate I'm building; so, I wanted to do some basic simulations in LTspice based on this thread: Adding Photodiode to LTspice Attached below is my circuit and voltage response at the oscilloscope. I'...
H: How does the lead polarity work on a D'Arsonval galvanometer? Following an illustration of D'Arsonval movement such as the following... I notice that the N polarized part of the coil is connected to the positive lead and the S polarized part of the coil is connected to the negative lead. Why is the galvanometer co...
H: Load cell temperature compensation Can someone explain to me how this (as advertised) full bridge load cell works? I'm aiming for good temperature stability and I understood a full bridge load cell configuration should reject error from temperature variation based on the fact that you're measuring the difference b...
H: BGA break out and impedance control I'm connecting two BGAs (0.8mm pitch) which are DDR3 signals. Vendor recommends 40 and 80 ohm for SE and diff traces. My PCB manufacturer suggests the following specifications for the diff traces: Width: 10 mils Distance: 7 mils Thickness: 0.67 mils Dielectric: 5.1 ...
H: Voltage output of AC current clamp So I'm using a Fluke i200s current clamp in combination with an oscilloscope to measure the AC current. Normal current clamps have a current output, but this one has a voltage as output. Now my question is does this clamp has the same working principle as the others(like a transf...
H: Is embedded C the same for all MCUs? I was coding for Atmel ATmega 32 chips. Now I have shifted to the ARM Cortex-M family. Is there any difference in coding between AVR and ARM, or does it depend on the compiler? How I would learn programming for ARM MCUs? AI: There is some similarity (obviously ANSI C is pretty m...
H: Mathematically I have enough power but the power source don't seem like enough Lets say i want to reach a certain wattage of 2,500 W. But I run it off a power source which maxes out at 5 A and 20 V. But I step the voltage up to 500 using a coil or transformer and now 5A × 500V is 2,500 but thats a lot of power from...
H: I need help to find this component I found these at the entrance of an analog input, so I think these are ferrite beads with a metal ground case but I need the part number. I searched several component websites but I couldn't figure it out (Mouser, Digikey, Farnell). I checked the manual and it doesn't have a schem...
H: Computer PCIE slot power in parallel with external power supply? I have an output card for my computer it is in the PCIe slot of the PC. From there it goes to a break out box. Where Pins 1 and 50 are power (5v) and 49 and 99 are ground. If i turn on alot of the pins on the card at once, there is not enough amps ...
H: Opamp demonstrates slew rate much lower than specified in datasheet TL,DR: Use a comparator, not an opamp. See Frosty's answer below. I'm trying to make a pulse waveform generator with variable duty cycle. The 555 timer is used to generate a sawtooth waveform, which is then compared to a constant voltage from a vol...
H: How to find the equivalent resistance of this circuit? I know that finding the equivalent resistance depend on whether resistors are in serie (R1+R2+...+Rn) or parallel (1/Req=1/R1+1/R2+...+1/Rn), but i don't know how to apply that to find the equivalent resistance of this circuit (not including Ra): simulate this...
H: How to determine full-load RPM of an induction motor at any arbitrary frequency? Lets say an induction motor's spec sheet states the following: 1/ 50 Hz, 2-pole, full-load rotations-per-minute (RPM) = 2850. 2/ 60 Hz, 2-pole, full-load RPM = 3450. Can we extrapolate this information to find out the full-load RPM for...
H: 28F010 flash in a 80C186 System I am reading a datasheet on the 28F010 flash. The datasheet states that for reading it behaves like a ordinary EEPROM but in order to alter memory content the command first the command must be issued. So then in datasheet there is a diagram where 28F010 is connected to a 80C186 proce...
H: How can I go about making temporary test connections in pcb while prototyping without soldering? I recently ordered some PCB bits from Adafruit to assemble a widget. I want to make temporary connections between different PCBs, but am not convinced I want to solder and then desolder and resolder wires while I am tes...
H: Do ICs sink their input current? I know this question may be very stupid, but it comes from a true beginner, and a Google search came up inconclusive. When porting high or low the input pins on an integrated circuit (particularly CMOS), are the input current sinked or sourced ? To me it makes sense that they would ...
H: What is the effect of a triac on a torque/speed curve? I am trying to understand the impact of a triac based speed control on the torque/speed curve of a motor. For as easy example, let's use a corded drill as an example. If I pull the trigger all the way the motor gets the full waveform and the torque/speed curve ...
H: Is this an SMD Pulse transformer? I have two of these units. The one that looks fried actually worked just with some cleaning, and the other one won't power up. I check all the SMD Transistor and resistors and I am getting power to the unit. The fuse checked good. The only thing left is this that I thought it might...
H: large current through power mosfet in LTspice I use some mosfet and BJT for a simple power path management in circuit. When Vprimary is larger than zener(indicate primary battery is healthy), Vprimary is connected to Vsys through M1 and M2 to supply power. When Vprimary falls below zener voltage, Q2 and M3 is biase...
H: VCC filtering for magnetic sensor on flat cable I'm designing an application for this magnetic angular sensor: https://cdn.sparkfun.com/assets/4/7/8/0/1/MA700.pdf Because this is precise and sensitive piece, I'm thinking if I should have additional VCC filtering. Any thoughts welcome! This sensor IC will sit on a...
H: Question regarding transistor codes I needed a 2N 2222A transistor. And from a electronics shop I got the transistor with following symbols, KSP 2222A -1426 I have already searched and know that KSP is the name of a manufacturing company. KSP - Components, Semiconductors, Capacitors I want to know what the last...
H: Help identifying a transformer with yellow bobbin and clarifying its purpose I've a small yellow taped transfomer. It has 6 terminals and one of the input and output terminals are shorted. It has a number (14) on one of the sides. I'd like to know the input and output terminals and also the use of this transformer....
H: Read and Write multi variable (Struct) from/to external FRAM memory over SPI by ATMEGA Using Code Vision I am working on a project to read some data from ADC and store them in external FRAM over SPI. I have 8 different float values which need to save when the power is off or other specific situation and after power...
H: How to build Li-ion over-discharge protection board I have an Arduino board with a pump attached to it, and for powering both, I'm using a 18650 battery cell with a DC-DC Boost Converter. I plan to leave it working even when I'm not home, and I know that if the battery over discharges, there will be trouble, so I w...
H: Microcontroller ATMEGA328P ports Hello I am fairly new to microcontrollers and would like to know how would one know if a port is analogic or digital? in function of their I/O ports. Thanks in advance AI: The datasheet shows which port is digital only, and which is analog or digital. Both graphically: And in a ta...
H: Is it possible for an opamp to oscillate at a frequency greater than its GBP? I was installing a tl3141 into a headphone amplifier circuit and it appears to break into ~250mVp-p oscillation at 8-10MHz on the lower half of the waveform when fed a 1kHz sine wave. Is that even possible given the specs of the opamp (GB...
H: Total Cable/Splitter loss calculation for Gain value compensation If there is an 8 port splitter attached to cables feeding an array, is the total Cable/Splitter loss = S21 measurement for each port (with terminations on others) OR I have to add the S21 value of each port? This is confusing me. So I expect -9dB fo...
H: How to calculate the output impedance of the BJT in a Common Collector Amplifier? The book I am reading from (Electronic Devices and Circuits by David A Bell) analyzes the Common Collector circuit by using a H-parameter model as shown. My confusion is in understanding the output impedance of the transistor. By loo...
H: Using FET as SPST switch to feed H bridge with boosted voltage My board uses TTL logic, I have a motorised pot that moves too slowly at 5V. At 9V it performs well, I have little LM2577 replacement modules that output the boosted voltage well, but they consume about 30mA at idle, so I only want it on (and in turn po...
H: Emitter follower augmented input current Hello, I have this emitter follower augmented ( I think that's his name in english) but I don't know from where is the beta+1 on the Iin ecuation? AI: Q3 is in forward active mode because the base-emitter junction is forward biased and the base-collector junction is reverse...
H: Why the voltage across emitter resistor comes out to be Zero while doing the ac analysis of a differential amplifier As I am trying to understand the half-circuit method of doing the ac analysis of a differential amplifier by going through the derivation available online, I've found that the voltage across the emit...
H: Some questions about a comparator circuit used as a buffer I want to hardware-trigger a module from a separate remote data-acquisition system's analog output. The module's hardware-trigger input is optically isolated to prevent grounding problems. And the module's manual mentions the following as well: And the dat...
H: How much power does a receiver antenna obtain from a radio station? I have this problem where a transmitting antenna radiated uniformly in all directions at a radius of r. The station broadcasts at 10 kilowatts. How much power is obtained by a receiver antenna 20km away? The antenna of the receiver is 50cm^2. I am ...
H: Resistance on Vcc and input pins CMOS Sorry if my the answers to my question is just "look up the specs of CMOS", I wasn't able to find it, only data on the manufactoring process. Doing research on a project, being new, I found a forum thread about someone wondering about some CMOS specifications. The numerous answ...
H: Current over CAT6 ethernet cable How much current can a CAT6 cable reliably handle? I want to use 3 of the cores for +5V and 3 cores for GND. I'm wondering at what current I need to think of another power solution. AI: At 5V you'll probably run into voltage drop issues before you run into current limitations (if th...
H: How long would an original gameboy last on a modern lithium battery? The original Gameboy was famous for it's battery life on 4AA batteries. My HTC One smartphone can last about as long as the GB did back in the 80s. So how long would an original gameboy last if powered by a modern lithium phone battery? AI: Let's ...
H: Looking for robust reversible prototyping solutions I've recently started making use of Arduino and Teensy microcontrollers to build various one-off pieces of equipment for my work in a neuroscience lab. Often I find that, after a device has worked well for one project, it needs to be tweaked for the next project ...
H: Fullwave rectifier theory Why is it that in full wave rectifiers do you divide the secondary coil by half as stated in this book: (Source) What concept am I missing? AI: what concept am I missing? If you use a rectifier bridge (four rectifiers), you don't need a center tap. However, if you have only two rectifie...