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H: MAX5725 SPI mode I'm reading the datasheet of MAX5725 but I cannot understand which SPI mode it uses. At page 18 I read: [...] the data is shifted in synchronously and latched into the input register on each falling edge of the serial clock input (SCLK). This limits the SPI mode to 1 (clock i...
H: SMPS load frequency to switching frequency If the frequency of the load exceeds the SMPS switching frequency, what are the results? AI: If the frequency of the load exceeds the SMPS switching frequency, what are the results? If what you mean is the frequency of current drawn by the load... Like any regulator, your...
H: SparkFun Power Driver Shield Kit for controlling 60 V input I just bought SparkFun Power Driver Shield Kit. I read in the specifications that it was possible to control up to 60 V using PWM. I have got a project where I need to control 60 V with the PWM so I bought this card but got a bit confused when I got it. I ...
H: solder/join single copper filament to contacts (speaker tweeter) As a result of the careful shipping of UPS, my speakers arrived with broken tweeters. One tweeter in particular has had its connections severed when the plastic support broke. I need to re-connect the filaments. In this picture the two single filament...
H: In semiconductor physics, how can we know which units to use for Boltzmann's constant? I'm working through Example 3.9 from Sima Dimitrijev's Principles of Semiconductor Devices textbook, and I'm not sure how to know which units to use for k in solving for \$v_{th}\$ in part a. The result there is obtainable using ...
H: How to calculate "mean instant power"? I have an homework assignement that gives me an headache, I have a circuit with a 2000W heater with a all or nothing regulation using a thermostat The heater is running 1/2 hour then stop for 1h from 6pm to 6am next day, so I calculated the duty cycle ratio (Time powered/(Time...
H: Circuit amps vs device amps I've always struggled with some really basic questions around amperage. Like, if you're plugging a 2 amp device into a wall socket, but that circuit is a 20 amp circuits why doesn't it blow up? Then I realized, and want to ask this question: In reference to circuits in a building, like a...
H: USB3.x and AC-Coupling Caps on the RX lines In the USB3.2 Specification (Sept. 22, 2017) Table 6-18 and Table 6-22 give some characteristics for the TX and RX lines. Basically, I understand that the TX lines have AC-Coupling capacitors to block DC and let just the AC signals pass. How is the min/max (75nF to 265nF)...
H: I like to know the details of how capacitors work? After all these years I am back to the start position of how capacitors work. I don't know to laugh or to cry. Okay even before that. When I hook up two wires, one on each terminal of a 12V DC battery and I measure the voltage difference at the end of the wires, i...
H: STM32 HAL VS dual 595 driven 7 segment display I got this arduino shield with four 7 segment display what I'm trying to make work with STM32 nucleo. The displays are driven with two 74HC595 shift registers. I wrote the following code to control it, but somehow it doesn't work, always shows the same pattern whatever...
H: Will my deep cycle battery protect itself from full depletion? I have a 12 V, 55 Ah lead acid deep cycle battery that I am using to power a small cooler/fridge that will hold medicine for a community project that I'm working on. The goal is to provide continuous power to the fridge despite any power outages caused ...
H: Input Impedance of the Inverting Op Amp I'm having a hard time understanding how to calculate input impedance of the inverting op amp. First, which two points do I need to calculate the impedance between? Is it between the two points indicated by the red line on the picture above? In this case I don't understand w...
H: How can I create feedback measurement with an operational amplifier? 0-20mA measurement I want to build something like this. This circuit controls 0-20mA but the circuit have one big problem. If the circuit load e.g 100 Ohm changes to e.g 200 Ohm, then less current is going to flow. To solve that issue, I need to t...
H: How do I invoke pymcuprog? I have successfully created an ATtiny406 binary using avr-gcc in Linux, and I can program it to the device via Atmel-ICE under Atmel Studio in Windows, and it behaves correctly. I would prefer to be able to program the device using my Atmel-ICE in Linux. So I did pip3 install pymcuprog-3....
H: Electrical Circuits Analysis Help Am I correct? Or does D= V1-20, which allows the value of V1 to be positive? AI: Yep, V1 minus 20 in equation makes more sense. If V1 was negative that would mean current is going into node from each branch which is impossible due to KCL.
H: ADC is giving fault codes when I touch thermistor attached to it I am working on writing a control program for my pellet smoker. I am having an issue with the meat thermometer that came with the smoker. I have a MAXIM 31865 ADC that is connected to a Raspberry Pi. Attached to the ADC I have a thermistor that is use...
H: Beginner problem: Debugging power supply I am debugging my power supply using an oscilloscope. I have uploaded pictures of my setup, including oscilloscope reading, wiring (just power and ground with jumpers), and the power supply specs. The power supply is supposed to output 5V 10A DC, but the oscilloscope at 1X i...
H: Solar panel charging issue I have a 160W solar panel that has a built in regulator that I have hooked up to a 100Ah 4 cell Lithium Ferro Phosphate battery. When I connect them the panel starts charging anywhere between 5 - 7 amps and get the battery to full without issues. The problem I have is once night time has ...
H: Can we program our smartphone camera to detect the frequency and time period of IR light? My use case is this: I am emitting morse code using a sole IR light source, and I intend to detect the frequency and the time period of the light source using my smartphone camera. Can this be done? AI: It depends on whether t...
H: Purpose of resistor to ground in video-amp circuit I was watching how to make a nintoaster, that is, an NES (Nintendo Entertainment System) in the form of a toaster. The video is here. One of the things he does in the video is building a video-amp circuit for the video signals from the NES. The circuit looks like t...
H: SAW resonator oscillator operating principle I can't for the life of me figure out how the following SAW oscillator works. I can't see how the oscillation would be maintained since it doesn't use a feedback mechanism I'm familiar with. This post could prove useful. So here is what I was thinking: L2 blocks high f...
H: Digital output of the STM32L152RE: toggling between +/- V? Is it possible to get the digital data output from the STM32l152RE microcontroller to toggle between +/- volts? where the +V will represent the logic-1 and -V will represent the logic-0, instead of conventional 0 V as logic-0 and +V as logic-1. AI: No, MCU ...
H: Ultrasonic HC-SR04 sensor, why does it even have a dead-zone of 2cm? So I have a hard time understanding why the HC-SR04 has a dead-zone of 2 cm. I understand why, the single-transducer ultrasonic distance sensors have a dead-zone, as they need to switching - But this is not the case with HC-SR04 as it both has a s...
H: LTspice error: No AC stimulus found I am using LTspice to simulate the AC analysis of a circuit. When I open the netlist of the circuit in LTspice and run the simulation, I get the following error: An example of the netlist that I'm using is: I have placed an independent current source between nodes 5 and 1 in th...
H: Why for setup check AND gates use rising edge, while OR gates use falling edge and vice versa for hold check in clock gating? I have two questions on set_clock_gating_check SDC command. Why for setup check, AND, NAND gates use rising edge, while OR, NOR gates use falling edge ? Why for hold check, AND, NAND gate ...
H: 4-20mA sensor to a microcontroller I need to connect a sensor with a 4-20 mA loop to a microcontroller. The MCU operates at 3.3V and the following image is from the sensor's datasheet. I'm planning on converting the 4-20mA to a 0.6-3V range to be measured with the internal ADC. I'm trying to figure out if the setu...
H: Memory row driver does not have enough driving power I am building the row driver of a piece of RRAM. Different from traditional memory, RRAM's cells are composed of resistor-like elements. I tried using a single inverter and a back-to-back inverter design (shown below), but they don't have enough driving power. Th...
H: What does this multimeter tempco spec mean? This is the accuracy spec for an Agilent 34401A 6-1/2 digit multimeter. What exactly does the "temperature coefficient" mean here? Does it mean that the reading will not change by more than 0.0005% (5 ppm) over the whole temperature range 0 to 18C? Or does it mean 5 ppm/...
H: Why is the mechanical power of a DC brushed motor at a maximum at around 50% of the stall torque? I don't currently fully understand how a DC brushed motor reaches maximum mechanical power at around 50% of their stall torque. I know that a decrease in the speed of the rotor will decrease back-EMF and in turn, incre...
H: Creating a footprint for a component with plastic "bumps" I think that I can best describe my question by giving two examples: This is a TRS audio jack: https://uk.farnell.com/lumberg/1503-03/connector-receptacle-3-5mm-phono/dp/1216980. It has two plastic "bumps" (I don't know how those things are really called) ...
H: Simulated bode plot in Simplis is different from the result of Mathcad I built an open-loop-controlled buck converter in Simplis. The parameters are listed below: \$V_g=12V,V_{out}=5V\$ \$D=0.52\$ \$C=100\mu F,ESR=5m\Omega; L=30\mu H,ESR=5m\Omega\$ I use Simplis to simulate the bode plot of \$G_{v_d}\$. And I use t...
H: STM32 - Getting HardFault when assigning uint32_t value Getting hard fault when assigning this 32 bit value to the shown variable(val_32); uint32_t val_32 = *((uint32_t *)( &buffer[0] + length - 4)); or uint32_t val_32 = *((uint32_t *)( &buffer[length - 4] )); Same thing but tried: uint32_t val_32 = *(...
H: Finding the kVA loading after improving the power factor This is a homework question I've been attempting. But the answer I get doesn't match with whats given and I don't understand why my method is wrong. This is the question with answers. Here's what I've done. I'm still new to these calculations. Thanks in adv...
H: How to Create Clocks on FPGA Board I am using an A7-100T FPGA development board used for a project. Up to this point, I have only been doing simulations on Vivado with simulated clocks or when I have been using the board, I have not had to create any clock signals due to only having basic combinational logic design...
H: large inductance compensation methodology in chip power delivery network i am trying to learn on compensation networks design. Suppose our power delivery network from VDD to the chip has very high impedance at certain frequency. i know that we cn use smith chart to design such network. i dont know the exact termino...
H: STM32 - Reading EEPROM via I2C Delay Problem Im trying to read/write EEPROM byte by byte but if i dont put an enough delay(~1ms) between read/write tasks, im getting or writing wrong value to the EEPROM. But this delay is taking a significant time when there is a many bytes to read/write and 400kHz losing its meani...
H: How can 24 V (two 12 V batteries) x 100 A power a 5 kVA (or 4000 W) inverter? I am a beginner at this. I know that energy cannot be created nor destroyed. I know you can't use 3 kVA inverter to run a 5 kVA dynamo (assuming I want it that way). Why then is 2400 W (12 V x 2 x 100 A) able to power some 5 kVA (4000 W w...
H: Capacitance per centimeter I need to design a 1 pF interdigital capacitor for a MMIC design, so I am using an online calculator to find out the dimensions ( https://www.rfwireless-world.com/calculators/interdigital-capacitor-calculator.html), there is also an easy formula for that. Everything is straightforward but...
H: Can an inverter through a battery charger charge its own batteries? I understand some of these laws of thermodynamics. An alternative to this question, being inventive, is 'Can an inverter power a dynamo (which is powered by an electric motor) to charge the same inverter batteries?' It may seem redundant but I am p...
H: TLP383 ltspice XVII model not working because of encryption? I tried to test the model of the TLP383 in ltspice which I downloaded from toshiba. TLP383 I added it as I always did with my models downloaded from the internet. But this time ltspice gives me the error: Unknown SPICE device type "1" in "17f62b..." So ...
H: In STM32, How to check the UART Serial Buffer If They Are Available using HAL Library I am using STM32F429 in my project which connects to an ATmega2560 thru UART. In arduino, there is a function Serial.Available() to check if the serial buffer is empty or not. Is there a function in STM32 that is similar to Serial...
H: MESFET in LTSpice It is really confusing to me. For some reasons I am migrating from Microcap SPICE3 to LTSpice. While in Microcap there was no issue with Statz model for GaAs MESFET, I cant figure out how to incorporate Statz model into LTSpice. I tried almost every possible combination, but not the right one yet...
H: JDS6600 signal generator - broken or normal? I recently treated myself to a JDS6600-60M signal generator. It's a (very) cheap one but that's because electronics is just a hobby and not something I make money with or anything. The other day I noticed that at very low frequencies (1-10Hz) the pulse wave looks like th...
H: LED Driver Pin function I have this LED Driver - A80604 I need to generate 30V for my LED Driver String for generating 300mA. In a previous question, I received an answer that I need to fix the current using the LED Driver to 300mA and the output voltage will take care of itself. My question 1 - So, in that case, I...
H: ADUM5028-5BRIZ inductivity problem I would like to build an isolated DC to DC converter for low current. I have found this nice chip, but in the datasheet there are two inductances listed but not in uH or mH. It's is only in Ohms. Can you help me please? Datasheet: https://www.mouser.de/datasheet/2/609/adum5028-137...
H: Transformer overdraw behaviour TLDR; - I want to connect such a low-value resistive load to a transformer that it draws ~1.6x the rated output current but I'll only do so for short periods of time so the transformer won't overheat. Aside from a drop in output voltage, is there anything that could occur that I shoul...
H: Oscilloscope: trigger and multiple periods of the signal I am trying to understands the basics of an analog oscilloscope trigger. As stated here, Instead of collecting a single snapshot of the input signal, an oscilloscope repeatedly updates the display with newly collected snapshots. Each snapshot is called a tra...
H: What does the flange do over that rectangular cavity antenna? I'd like to know what does this flange contribute to the rectangular cavity just below the flange. I assume it's to reduce side effects, what else are the contributions the flange does to the cavity? What's meant by infinite flange and finite flange? Tha...
H: What causes the electromagnetic waves to prefer one dielectric over another? it's known, and there are some devices that exploit this phenomenon (see the references if you want), that if an electromagnetic source (antenna) is placed between two different dielectric layers, the waves will prefer one over the other a...
H: IMU BNO055 Alternative? For a robotic application, we bought Adafruit boards of the very popular BNO055 IMU. We can still buy plenty of these modules, but it seems the BNO055 chip itself is unavailable. It even disappeared from the Bosch website without any information. Why is this chip unavailable and what could b...
H: Confirmation on how to check microcontroller memory capacity with Atmel Studio When compiling code in Atmel Studio, I get the following output showing the percentage of usage for the program and data memory: Does this output represent the total data usage in the microcontroller? AI: These figures will not include ...
H: Transform TFT to AMOLED I was wondering if it is possible to transform a TFT LCD into an AMOLED as both are active matrixes. The composition seems to be similar. AMOLED TFT (LCD) And if it wouldn't be possible, could I at least keep just the part that is very hard to manufacture (the TFT itself)? Maybe do the res...
H: How to determine if conventional electronics circuit is a better choice over a MCU? I am a software engineer and have limited experience with conventional circuitry. Recently, I have built a prototype device that uses an Arduino Uno, a Bluetooth module, an array of temperature/humidity sensors, and an OLED readout ...
H: RFID antenna beam direction and how to control it I've been working on some RFID stuff lately and I'm wondering if someone could help me understand how the beam direction works? I'm having problems with my RFID reader picking up signals from tags that are behind it. From what I understand, the beam that powers the ...
H: Can you connect two LM317s either in series or parallel to help spread out heat? I am designing an adjustable voltage regulator. The regulator will have be able to switch between maximum Vout of 9V, 12V, 15V and 18V and will have a variable resistor that can adjust the voltage from 1.5V to its selected maximum volt...
H: Why does the resistance of a brushed Dc motor from an experiment kit vary? I am currently performing an experiment in which I measure the Current and Voltage of a motor that experiences changes in load. I am using a 3V (3V battery) supply however the voltmeter's (connected to the terminals of the motor) reading cha...
H: simplifying RTD (resistance temperature detector) units using a RTD, the norms give you dissipation constants in ohm per ohm per degree C, I dont understand as this should simplify to simply degrees C? what is the meaning of this unit? Thanks! AI: That is not "dissipation constant", it is the temperature coefficie...
H: Does anyone know of a way to control two sets of switches at once? I would like to control the two switches in the picture at the same time. So for example when the left switch is in position 1 the second switch is also in position 1. Is a 2-pole rotary switch what I'm looking for? Also sorry if the way I used the...
H: Proximity sensor to measure object presence, speed and orientation As depicted in the image, I'm looking for sensors to incorporate in a project where I have to detect object presence in short range (10-100mm), speed (passing from one sensor location to another, 0.1-10m/s), distance and orientation (just roughly). ...
H: The relations of the value of the constant of integration is zero between a DC component I've been may asking the really easy question. The circuit which was made of the AC source and the coil exists. \$L:=\$self inductance of the coil. \$v(t):=v_0*\sin(\omega t)\$ (The voltage between the terminals of the coil.) \...
H: Instrumentation amplifier output attenuation in LTSpice My task was to design an instrumentation amplifier with given specifications and simulate it on LTSpiceXVII. We were told to only use one type of ac source, so to get the inverted signal I used a simple inverter design with unity gain. However, I noticed that ...
H: Instrumentation Amp design for breaking ground loops between systems We're in the midst of designing a device for measuring analog signals and have been testing our initial prototype. We had a single-ended gain stage before the ADC, but due to the connections in the rest of the system we are experiencing ground lo...
H: Understanding the curves of a MOSFET I am trying to understand the curves of a MOSFET. Sorry if the question is very basic. Where the red point is is the saturation zone of the MOSFET, therefore the source drain voltage must be 0V because at this point the MOSFET is saturated conduction at maximum current, because ...
H: What exactly is electric potential (what's wrong with my picture of it)? In my book, the potential at a point is defined as the work done on a charge to take it from infinity to the point against the field whereas the gravitational potential of a ball is the work done on it to take it to a height against the gravit...
H: Rated voltages for the Cage clamp connectors? what does the rated voltage for a connector means? How should we select the connector for a 230V AC application? Let us say can I use this connector for my 230V AV application? https://www.phoenixcontact.com/online/portal/de/?uri=pxc-oc-itemdetail:pid=1904969&library=d...
H: Would a MOSFET driver be a suitable replacement for this circuitry and would it reduce power dissipation in the FET? This is a follow on from a previous question here. I asked if replacing a MOSFET with a lower RDSon would reduce the heat generated by the MOSFET and the answer I got was that FETs with lower RDSon h...
H: Complex impedance calculation for resistors and coil I have this circuit and I need to calculate the total complex impedance. Note: the \$r\$ is internal resistance of the coil so how can we calculate the complex impedance? The coil and the resistance \$R\$ are in parallel. AI: Well, the impendance of this circuit...
H: Trapezoidal wave rms value calculation Does anybody know how to calculate this wave RMS value? The answer is I use Mathcad to prove it but I still can not get the answer. Hope someone can give me help. AI: Well, the general formula for the RMS-voltage is given by: $$\overline{\text{I}}=\sqrt{\frac{1}{\text{T}}\in...
H: How do these FET's work back to back? Self thaught electronics hobbyist, I might be missing/misunderstanding something obvious. I'm designing a circuit and added a battery protection based on the Diodes Incorporated AP9101C (Product page). I don't really understand how the FET's work in the "typical application cir...
H: How should I interpret this CAN bus protocol - J1939 I have been using J1939-21(Data link layer) many times, but now I'm confused. First I know that a J1939 protocol is build up from a data frame and that data frame looks like this in practice. <ID> <DATA OF 8 BYTES> The rest handels the CAN-bus controller. The ID...
H: Output power of HEMT Reading a paper regarding a power amplifier based on HEMT technology, the following statement in made: 'The circuit was designed in WIN 0.1 μm GaAs process on a 2 mil thick substrate,has power density of 850 mW/mm and its breakdown voltage 9V. According the process power density, a 4×25 μm dev...
H: 2-Layer PCB Through-Hole Layout/Soldering So I'm designing a 2-layer PCB consisting of a bunch of ICs (op-amps, OTAs) and passive components. I would like to have my decoupling caps (little 100nF axial) as close to my op-amps as possible, so I've have the following thoughts. My op-amp sockets are mounted on the fro...
H: Meaning of the terminology "referring to primary" or "referring to secondary" in the context of transformers equivalent circuits I`m studying transformers equivalent circuit and encountered this term "referring" to primary or secondary and I was confused by this terminology. I tried to look for a definition but cou...
H: Op amp output limited I'm playing around with this op amp: https://www.st.com/resource/en/datasheet/ua741.pdf. My circuit looks like this: It is hooked up to an Arduino Uno. I used analog read on the Arduino to read voltages at 2, 3, and 6. The pot allows me to vary the voltage at 3 from 0 to 5 V. With R1 = R2 = 1...
H: How to operate a lower power thermistor power circuit? I would like to like to create a temperature circuit that connects to a wireless module (e.g. Bluetooth) to transmit the signal. My challenge is that I have a limited power supply (200 mA - 3.5V) to power both. Therefore, I would like to use as little power as ...
H: Can I load an external file into table for LT spice? I would like to load a table (for table instead of editing the table manually) into LT spice, but it's very large (180x2 items). Is there a way that I can load a table into LT spice from an external file? (I know I can load a PWL file from a csv into a voltage so...
H: Where to start on creating radio circuits I'd like to interface with a legacy system that uses BPSK at ~5MHz to transmit data. I understand the basic idea of BPSK - that it's a 180 degree phase shift to represent data - but I'm having a hard time finding examples that take an Arduino or something and create a BPSK ...
H: Weird hysteresis behavior I am an EE student and recently we worked with Schmitt triggers, positive feedback loops, and hysteresis. I was curious and hooked up an mcp601 without a feedback loop as such: In the above schematic the pulse generator is behaving as a triangle generator. This is labeled Vin on the oscil...
H: Wilkinson Power Combiner Feasibility I'm trying to design a low-power passive communication system. It receives its power via wireless transmission from a nearby transmitter and to power a sensor which digitally modulated a signal via backscattering. The power calculated to the antenna @ 915 MHz with Tx and Rx gain...
H: Why the pinout on the Raspberry Pi Pico development board, are labeled under the board? It may seem a stupid question, because it is common for many careless manufacturers to print the pin markings under a development board; but not for a company which is known for its user friendly designs and a big audience in ma...
H: Stackable PCB Sockets/Headers I have two PCBs that I would like to connect/sandwich together via a 1x5 header on the bottom board and a 1x5 socket on the top board. The components I have so far seem to work nicely, the only issue is the spacing between the boards. Due to some larger components on the bottom board, ...
H: Can I run a VFD off a generator? I want to power a three-phase 5hp well pump with a VFD. I want the VFD both to serve as a soft start, and to allow variable speed operation of the motor. Two different pump salesmen have told me that running a VFD off a generator might hurt the VFD. Is this so? And if so, what is th...
H: Small AC-DC conversion/amplification So essentially looking for the most efficient and effective way to take a 3V 50hz AC signal and convert it to an 11-33V DC signal (any voltage between 11 and 33 works for an input to embedded pc) . I have looked into a couple different options such has bridge rectifier with a ca...
H: Why shouldn't I use a Zobel network to improve the power factor of an electric motor? This is a homework question, so I would prefer something that would make me think and maybe promote discussion. I understand the use cases for a Zobel network in an audio setup, but I struggle to see the connection to electric mot...
H: Could someone explain to me a simple opamp problem, please? Could anyone please explain to me why a simple voltage follower misbehaves in certain configuration: Opamp LM358 configured as voltage follower. Working case: Vcc 12V. +IN: pulled up to 5V with 10k resistor. OUT: steady 5V, perfect! Problem case: The same ...
H: AG9205S PoE PD Module and Raspberry PI I have in my hand a AG9205s PoE PD module (output 5V and up to 13W) and I want to use it with my Raspberry PI 3B+ (that exposes the center core tap wires to the J14 pin header, as you can check here in the schematic) Now comes my question: the AG9205s module shows that the ext...
H: How to implement control of the bidirectional buck-boost dc/dc converter in software? I am at the beginning of the development process of the control software for this dc/dc converter i.e. bidirectional buck-boost converter I have studied the available literature and I have found that there are four possible opera...
H: How to build large multiplexers using SystemVerilog? Note: This question about multiplexers is similar to but not identical to this question which is about demultiplexers. I want to build a fully parameterisable multiplexer in SystemVerilog. So far, I know how to build multiplexers of variable widths like this: mod...
H: How to build large demultiplexers using SystemVerilog? Note: This question about demultiplexers is similar to but not identical to this question which is about multiplexers. I want to build a fully parameterisable demultiplexer in SystemVerilog. So far, I know how to build demultiplexers of variable widths like thi...
H: 5V Powerbank not turning on automatically when > 100mA are drawn In this project, I power cycle a RaspberryPi Zero over a 5V USB powerbank, please have a look at my previous question: Blocking current from Backup battery (3x1.5V=4.5V) when powerbank (5V) is turned on my timer switch I use the TPl5110 as a timer swi...
H: 8Mbps power line communication with PLC \ Homeplug I'm trying to design a circuit to transmit data over the power lines. The data I'm trying to send is real time FFT of about 100k samples per second, for 32bit data this comes to about 3.2Mbit data per second. I have found various ICs that implement a PLC communicat...
H: RC circuit with a constant current source I am trying to simulate a series RC circuit excited with a constant DC current source in LTSPICE. The expectation is that it should linearly charge the capacitor with a constant current flowing through it however what I am seeing in the simulation window is a zero or nearly...
H: How Do These Kind of Power Switches/Systems Work? Just about all power switches in DIY electronic projects, such as Arduino, simply cut off the power source immediately when you turn it off. However, there are devices like 3D printers that when you push the power button to turn off, it does a few last tasks before ...
H: What is the reason why USB plugs connect power before data I am designing USB unplugging/plugging hardware and I wanted to know why USB plugs are designed such that the power leads make a connection before the data. Is it purely to ensure that data is not able to connect at the same time and/or before the power is...
H: Should I add a resistor between _every_ WS2812b pixel? I have some strings of WS2812b 'Neopixel' LEDs. Some are individual pixels separated by short lengths of cable; others are clusters of six or twelve pixels separated by slightly longer cables. The cable will be fairly chunky (up to 1.5mm²). Adafruit's best prac...
H: What is the best low power wireless transmitter? I would like to send a sensor signal (e.g. Temperature) wirelessly to a computer for a short distance (e.g.3~5 meters). The challenge is I have a very low power source (3V 50mV). I am thinking of using a Bluetooth chip: (Good quality signal, but I feel that the chip...
H: Understanding high-speed Improvements to discrete BJT multivibrator What exactly are the Zeners doing in this circuit? I've been trying to improve my understanding of BJT's, by trying to 'improve' the classic astable multivibrator. In an effort to 'sharpen' the transistions, I included a Zener diode between the cap...
H: Should I get CE mark on my Arduino project? I just finished my big Arduino project after 2 years. I would like to start selling it, but I am not sure if I need CE certification or not. I used the below components: Arduino Nano-oled 0,96" keypad simple buttons TP4056 2-5V DC-DC converter NRF24L01 2.4 GHz module I ...
H: Using voltage divider vs using a DC-DC converter I have a DC-DC converter that with a Vin of 4.75V-14V and a Vout of 18V. Unfortunately I have a Vsupply of 24V. Should I use another DC-DC converter with a Vin capable of 24V and a Vout between 4.75V and 14V or should I just use a voltage divider to to step 24V down ...
H: Does anyone have experience with the recom rpx-1.0 or similar that could explain a few things to me? I'm looking to have 4 dc-dc converters each with different outputs but one voltage input value. Vout of 9V 12V 15V and 18V. Would this chip be able to do that? Here is a bit from the data sheet and I believe that t...