Datasets:
Alignment-Lab-AI
/
StackStore

Dataset card Data Studio Files
xet
 Community
1
text
stringlengths
83
79.5k
H: What is the difference between an analogue multiplexer and digital multiplexer? As far as I know, analogue multiplexing is used to take voltage samples from many channels in a short time. It passes the voltages from an input to the ADC without amplifying them. I guess buffer them? But is that called analogue becaus...
H: Can you have two sources run to one speaker if the power is cut to one? I have a Radio that I am modifying to be able to play a old radio programs off of a SD card. Basically I have a mp3 player and radio in one case the mp3 play is powered off of its own power supply and the radio is powered normally but with a re...
H: Why use the fast Fourier transform for noise reduction instead of a classical electronic filter? I'd like to know how to remove environmental noise from a speech recording. I've made some research and I've noticed that most of the methods proposed use the fast Fourier transform. But why can't you use a classical e...
H: STM32F407VG SDIO read and write speed I am writing the on board accelerometer data to my SD card. I am using a STM32F407VG board. The data is being written and read. How can I measure or test the speed of reading and writing data to the SD card through STM32F407VG board? AI: Count the number of written blocks per s...
H: Can I break a radio tranceiving device by operating it with no antenna connected? People tell me I shall not use my CB-radio station without an antenna connected or it will result in damage of the device. Is this true and why is this? AI: You could potentially break some radio transmitters by operating them without...
H: RS-232C with phone connector I found the following picture of the connectors of a monitor. The serial connector looks like a phone connector. But I know only the D-sub and RJ connectors for serial ports. Can anybody tell me the name of the specification for this cabling? AI: It's likely a 3.5mm audio jack also cal...
H: Electrical commutator for a coffee machine i would like to understand the role of the commutator in the following diagram. NB: abbreviations: Co: commutator Re:heating element Pr: pressure switch Sa: heating element protection Ct: power supply connector Ma Bv and Gv are colors I have not a solid background on ele...
H: Charging 2 LiPos in serial used as split rail I was wondering what the recommendations are for creating a charging circuit for 2 LiPos when they are connected in series, but as a split rail, shown below. Currently I am just disconnecting them and charging them using the sparkfun charger PRT-10217. Previously I hav...
H: Part name in Pspice I was working on some simulations in logistic map in MATLAB, and need to verify some results in a virtual circuit of a logistic map. I found this circuit diagram for the logistic map. However, I am having some trouble finding two parts of this circuit in PSPICE. First, what should I search for ...
H: Water Sensing Circuit I'm working on a circuit board driven by a PIC18F; one of the components on the board is a water sensor. This is pretty straightforward, there are two electrodes on a probe; when immersed in water, there's enough conductivity to complete the circuit, and it pulls a pin high on the PIC. Below...
H: How to make a button activate its corresponding binary address I have 15 output buttons and 4 digital inputs. As in the picture: How do I make each button activate its corresponding address. For example, when I press s3, I want GND to be sent to inputs 0 and 1. When I press s7, I want GND to be sent to inputs 0,1 ...
H: Differential Amplifier with Global Negative Feedback This question refers to audio amplifier design, using BJTs only. I am wondering how differential stage amplifier plays an important role in hi-fi audio amplifiers. According to this book (where picture was copied from) I have, a part of output signal is feeding t...
H: Solid State Flasher controlling other Relays I'm a freshman computer science major, and I still have a lot left to learn in the realm of circuitry, but I have a decent understanding of the fundamentals. I have made an electric bike, and I wanted to install turn signals. The bike's battery is a 52 volt nominal, Lith...
H: Current amplifier to raise 0-5 mA to 0-20 mA range I have a little BLE device that can drive an LED at variable brightness (according to a programmable 0-255 byte value). This works, but has the major caveat that it can only source 5 mA, whereas many LEDs are spec'd to run at 20 mA nominal. The result is that it ca...
H: Series Termination Resistors Sharing a Common Point Suppose I have a high speed digital signal (represented as a square wave) that splits off and is shared between two subsequent inputs stages (represented as MOSFETs). Is it better to have two series termination resistors for each input stage? simulate this circu...
H: Power & Reset in momentary switch in analog circuit So I am designing a circuit and wanted to implement both power and reset in one momentary switch. What I mean is, if the switch is pressed, it sends a reset signal (4.5v), but if it is held for x seconds, it powers on/off. I figure I might need a 555 timer. How to...
H: Guidelines on PCB design with components only partially wired on PCB traces There were a number of questions/answers here somewhat related to this question, but not exactly the same. I am developing an inverter with half bridge MOSFETs with high voltage and current over 100 amperes using parallel MOSFETs. MOSFETs d...
H: Factors to consider when swapping a battery with a power supply I'd like to swap an 18V lithium-ion battery with an 18V DC power supply for use in battery-powered hand tools (cordless drill, reciprocating/circular saw, weed whacker, etc.). Logistical issues aside, are there any electrical considerations where a ful...
H: GPIO Output Registers on the STM32 Hi I'm currently attempting to write a simple program using the STM32 Nucleo development board, based around the STM32F334R8. The application sets up the GPIO ports A and C and reads the state of the button. If the button is pressed, it turns on the LED. If not, it turns it off. F...
H: Why do I get terrible static in my phone mic / recording when my phone is charging from the mains? I live in an apartment block in the UK. When I record my voice into my phone's voice app when the phone is charging from the mains, I get a terrible constant static sound that is not present when the phone is not plug...
H: Half of differential tage voltage gain I can't understand why is 2Rpi in equation 375/376. It looks like the current ib1 goes through Rpi of first stage and through Rpi of second stage but it must go through first Rpi to ground and back to signal source. Why it's so? AI: Here think of the differential mode half-cir...
H: LED spotlights in soffits I am looking into buying some 5W LED 3000k GU10 spotlights with a rating of 450 lumens, for my gypsum soffits. The only part which is confusing me is what viewing angle I should get. I have found a lot for sale with a viewing angle of 60 degrees, 90 degrees or 120 degrees. However I am n...
H: random current on/off IC available? I am still very new to electronics, but have been using Arduino to build stuff with. But I require a component for a project that does not contain any Arduino because of space. So I am looking to see if there is, or the best work-around, a IC that will randomly generate a pulse ...
H: mic5504 + esp8266 = going mad I've a board with an esp8266ex and a flash IC. The main power rail is +5 and it goes into a MIC5504 for 3.3 voltage regulation. The enable pin of the MIC5504 is tied up with a 10k resistor to the +5 power rail. The problem is that I'm going literally mad with this voltage regulator, I'...
H: Theoretical calculation of DDR3L transfer speed I am not sure if this questions belongs to this stack exchange site but I didn't find other better one. In case it doesn't, let me know and I will move it to some other place. I am working with a QorIQ T2080 Soc and DDR3L (DDR3-1866 mode, cycle time: 1.071ns @ CL=13 )...
H: STM32F103ZET6 ADC with DMA whilst sleeping and interrupt every 0.5s I am currently trying to get my STM32F1 MCU to ADC 500 samples and DMA these into memory whilst asleep and wakeup after 0.5 seconds, i.e. have a sample from every 0.01s and then wake up after 0.5 seconds to process. I am currently getting a wakeup ...
H: 9 wire universal motor So I found an old washing machine and salvaged the motor. However I can't find any information about how to wire it because it has 9 wires coming out. So 2 of them are speed control = 7 to go. 2 are brushes and that leaves 5 for windings which seems like a lot. This picture shows the insi...
H: Induction motor scalar control I have been developing a software for scalar control of three phase induction motor with squirrel cage rotor. This control method is based on voltage-frequency characteristics of the motor. The used motor nameplate contains 400V, 50 Hz and the stator is in wye connection. Based on the...
H: How to implement 8b10b en/decoding protocol between two FPGAs? I'm using two Xilinx FPGAs (one Kintex 7 and one Artix 7). The Kintex 7 is tied to its own system (OPAL-RT software, it is a simulation software that is an addon to Simulink which lets data be output to an FPGA via a user CPU input) and will be outputt...
H: Power amplifier input source current path Can anyone draw (or write in text) the small-signal path from signal source XFG1 at input of Q1 base to amplifier load for positive and negative input signal swing? AI: I will try to show you two extreme cases (when clipping). For the Positive half of a sinusoidal swing: ...
H: 5V Tolerant I/O A lot of micro-controllers has 5V Tolerant I/O pins using lower supply voltages (For example 3.3V). Even when they can't drive more than 3.3V at the output, they can be used in open-drain configuration for tri-state operation (useful for I2C) What is the real advantage of it? Is there so many exter...
H: How did rotary converter commutators conduct electricity? I've been reading about rotary converters and examining photographs, but I've noticed that nearly all have a very strange (to me) commutator design. It looks like a piece of wire screen rather than solid commutator plates. Compare: rotary converter commutato...
H: Is it safe to use a lower rated cable to power a higher amperage device if it isn't constant? I'm designing a breakout kit for an open source standalone ECU. The ECU has a 40 pin IDC male socket which has all the pins required to run the engine. One of the components will be injectors which use around 3 - 4 amps. ...
H: How to determine which bridge rectifier to use I tried searching and couldn't find how to determine how to decide which bridge rectifier to use in a circuit (assuming you know load). is the only consideration that the rating exceed to voltage and current of the circuit or could it pose a problem if that rating were...
H: Theory of Mosfet P channel someone can help me explain why is ~6V at source terminal? AI: After turn on supply on source is 10V, but beetwen source and gate is -10V (gate is invers polarity for source). Transistor go into conduction state but with increase current the voltage on source terminal decrease. Potencial ...
H: Why does inductor current in my LTSpice model rise to infinity? I have been working on learning LTSpice because it appears it could save me a great deal of time. To that end I have constructed this circuit Purpose of circuit This circuit is a high side driver for a N-channel MOSFET. It switches a resistor on and o...
H: How can I set the pad spacing and size of the footprint of the PQFP package? I'm beginner in electronics. I want to make footprint of HV5622 shift register using Eagle cad. But I don't know how to set the pad spacing and pad size of the footprint. There are three values in the datasheet: min, nom, max. I don't kn...
H: Are DIP sockets against overheating worth the cost? Sockets allow easy replacement of a device and eliminates the risk of damage from overheating during soldering. [Wikipedia] I personally never (ever) replace these ICs. For programming microcontrollers (as a hobbyist) I use a dedicated pin header. So the only re...
H: How to compensate gain and offset errors I have an analog circuit which has an offset error as well as an gain error. I can measure the analog output of the circuit and I am able to manipulate the gain of the circuit by means of a factor k_gain_comp and the offset by an additive value offset_comp. What is the right...
H: Are transient response, natural response, impulse response same thing? According to wikipedia, they are equivalent. Is this correct? AI: Natural response is the zero input response (i.e. response to initial conditions). Impulse response is (unsurprisingly) the response to a unit impulse - the Laplace Transform of ...
H: Does somebody know about this tool? I'm very proud to be a part of this community. I'll be very thankful,if somebody does recongnize this simulation tool? (Please see image) Thank you very much for your help. AI: It is Ascet for model based software development. Advanced Simulation and Control Engineering Tool
H: What is the fault with my hbdridge design in the below circuit using pchanel and n chanel mosfets? In the image... Q1,Q2 - p channel mosfet (IXTH11P50) Q3, Q4,Q5 - n channel mosfet (IRFP460N) The problem I faced here was...when I test the circuit with 12 volt dc supply, and my load is two leds, it works very fine.....
H: Piking servomotor from datasheet Hi I saw several datasheets from servo that use kg-cm units and other that use kg/cm I think that is a misspelling error, this is not my problem I assume that the unit most be kg-cm in units of torque force times distance. Ok, so when the units are in N-m there not problem by when ...
H: Does the polarity of this crystal matter? I am using TXC 7B 16.0 mghz crystal for my design. I just received photo proofs from my PCB assembly house and it appears they soldered this crystal 180.0 degrees reversed. https://www.digikey.ca/products/en?keywords=887-1104-1-ND Edit: the real datasheet AI: No, the polar...
H: Is it possible to search gerbers for specific parts? I am using GC-Prevue to view gerbers I have been supplied. When I am looking for a part, I typically search through the silkscreen until I find it, (I do not have the PCB design file). This is really time consuming, very annoying and shockingly inefficient. Gi...
H: Symbolic logic operator "implication" to logical gates I need to translate a symbolic operator to a logical gates circuit. Following the table that the symbolic operator has: P Q Result 1 1 1 1 0 0 0 1 1 0 0 1 Any idea how can I make it? This is a draft of solution AI: A simple solution for such puzz...
H: STM32F746 Clock not reporting as expected I'm using an STM32F746VGT6 microcontroller configured from STM32CubeMX for all the clocks and I'm getting roughly 220% higher clock rates when compiled. For instance I have an HSE crystal at 11.2896MHz with the following main PLL settings: PLLM /11 PLLN *234 PLLP /2 PLLQ /...
H: Interpretting WS2812 datasheet data input requirements I'm really new to hobby electronics, just got a raspberry pi and trying to read different data sheets and requirements to figure out what I need to get so that I can drive an LED strip with the correct voltages and current. I've been looking at the data sheet f...
H: Resistor Divider PMOS Example Problem From Razavi's Design of Analog CMOS Integrated Circuits, question 2.6a asks to plot \$I_x\$ vs. \$V_x\$ as \$V_x\$ varies from 0 to 3 V in the circuit below. The solution manual states that: $$V_{sg} = (V_{dd} - V_x)\frac{R_1}{R_1 + R_2}$$ However, this doesn't seem right. I t...
H: How to stop a 555 timer I have a 555 timer set up so each cycle it will count up a 7 segment display. clock output of 555 goes to a CD4026B clock input , this feeds the 7 seg display. I would like when the 7-segment display reads 9 9 the 555 timer turns off. Any idea how i can do this? AI: With those counters y...
H: Measuring noisy signals: Does wrapping the test lead through a ferrite reduce common-mode noise? Let's assume we have a test set-up involving an oscilloscope and a unit we are testing. we measure the voltage between two points using a standard scope lead and see significant noise, I now take out a clip on ferrite w...
H: Power plant cost accounting For a 300 MW power plant, 14.5 MJ / kWh of heating capacity must be provided. For this you can use coal with a heating value (hW) of 29 MJ / kg and a price (P) of 35 € / t or gas with a calorific value of 36 MJ / m3 and one Price of 90 € / 1,000 m3. What is the hourly cost (KB) for thes...
H: Can 1 relay turn one light off and another on? I have a 24 VDC sensor that connects to a switching amplifier. When the sensor detects a fault it should send a signal to a relay which is connected to a green LED and a red LED. The Green LED should be on all the time unless there is a fault sensed by the sensor. If t...
H: Trying to understand how to design the gate of a frequency counter I´m trying to design a frequency counter for my physics class. My teacher demanded that we build it using a 32768 Hz crystal and 4060 ic. In my research i stumbled across this design: I don´t have a good knowledge on digital electronics and i have ...
H: varistor curve and voltage meaning Could I get an explanation for these datasheet definitions for a varistor? 1) Max. applied voltage. 2) Min varistor peak volts. 3) Max varistor peak volts. 4) The clamping voltage is known to be the maximum voltage can pass before it restricts. This diagram is iv characteri...
H: LDO voltage regulator with passthrough I'm trying to design a circuit that will power my 12V LEDs. The battery should be 12V and up to 14V when charging. I would like to route it through an LDO voltage regulator when the battery is charging and just pass through the battery directly to the LEDs when it's below 13...
H: Thevenin \$V_{th}\$ calculation problem I'm back with my basic questions. I'm trying to answer some questions, using Thevenin, for this circuit: simulate this circuit – Schematic created using CircuitLab I must answer: \$R_{th}\$ \$V_{th}\$ Find short circuit current on A-B For \$R_{th}\$ it is quite simple ( I ...
H: The stopwatch function in MPLABX gives a value that's way off in reality I have a PIC16F688 running on 4MHz (intosc) and I need a delay for about 1 second. Using this for-loop: for (unsigned long n = 0; n < 219300; n++) {} yields this result in the stopwatch function in the simulator: Stopwatch cleared. Stopwatch ...
H: Device to programmatically controlled USB relay/switch (Edited to remove shopping question. I don't need recommendation of a specific product as much as I would like to know what such a device would be called.) I'm know more about programming than I do about electronics, and I'm looking for an inexpensive way to ...
H: How to connect clean power to multiple pins I’m more inclined with software than hardware, so there may be a simple answer I’ve missed somewhere. Most of the ICs I’ve been looking at require multiple VCC and VSS pairs such as cortex processors. I have read many posts elsewhere aging that these pins need to be conne...
H: Periodic or not Periodic signal I am trying to solve following problem which I try to find the signal is periodic or not. However, as it is different from traditional examples I do not know how to solve it. Can you please give me clues or solve it? AI: If a signal is periodic then its derivative will also be perio...
H: Vccs op-amp with transistor So, i got this Vccs opamp that I want to use. I know that the Vcontrol is the voltage that will appear in my Rsense and knowing my Rsense I can find the Ie. What I dont get is the role of the Vc and whether it determines the Ib and Ic. I got the datasheet for both the opamp and the tran...
H: Adder propagate P expression When dealing with carry-look-ahead adders, the following expressions are commonly used: $$P=A \oplus B$$ or $$P = A + B$$ I understand that using the second expression takes less gates for calculating the propagate signal. When computing the final sum $$S=A \oplus B \oplus C$$ where C i...
H: (System)Verilog: signal is x or 1 depending on placement of concurrent blocks in the code? I'm basically aware that the Verilog scheduler is inherently indeterminate, but I really don't understand why that's the case with the following code (I've simulated both cases with Icarus and Incisive on EDA Playground). The...
H: Why is this reed switch / solenoid circuit not working? The (normally open) reed switch should close by waving a magnet across it, completing the circuit. The 6v solenoid lock should pull inwards allowing the door to be opened. When the magnet is removed the reed switch should open. So my issue is the solenoid pin ...
H: How can I use half-wave rectified 120VAC to activate a PLC input? I am working with a CLICK PLC with the C0-08NA 120VAC input module. According to the documentation, the C0-08NA's equivalent input circuit looks like this: A device I need to interface with is powered by 120VAC but uses diodes at various points in i...
H: Discharging MOSFET using Resistance or Diode (Best possible Alternate) I have two Questions about MOSFET as sensor device. 1. I had been using resistance to discharge MOSFET. but I can not figure out minimum requirement of the resistance which could work on 12V power supply? 2. Can I use diode to discharge MOSFET?...
H: DC Motor causing photodiode emitter/detector into binary counter to malfunction Schematic shown below, except the resistor on the phototransistor is now 4k and I took out the PNP. The system is supposed to activate the motor on an up-down switch, forcing the first t flip flop positive. Then an 8 hole optical encode...
H: DC motor single rotation using Photodiode-transistor I am trying to build a system where a switch toggle (up then down) will cause a dc motor to do one full rotation and stop until the switch is flipped again. The only other input allowed is a hard reset button. This is an analog circuit on a breadboard. I have re...
H: Confusion regarding piece wise linear diode model I understand that when you have a diode that is in forward bias, it can be modeled by a resistor and a voltage source, as seen in the top right of this diagram. However, I'm confused about the negative bias region (modeled by the bottom left corner resistor/source c...
H: Electrochemical Measurements Using Lock-In amplifier I'm trying to measure small electrochemical signals using a trans-impedance amplifier fed into a lock-in amplifier. I have an electrochemical cell that poses a very high impedance (100s of MegaOhms) that I feed a triangle wave into (5V P-P) the excitation frequen...
H: Open Wounds and Skin resistance I always read that pierced skin will dramatically affect skin resistance, but they never seem to specify where the open wounds are on the skin. Say I have open wounds around my chest area, but I am touching something with my fingers. Does the location of these open wounds near my hea...
H: Principle of diode in DRL AND gate The explanation (from https://en.wikipedia.org/wiki/Diode_logic) states that R is connected to +12 volts to provide the forward bias current for the diodes and current for output drive. If all inputs A AND B AND C are a positive voltage (+6 volts here), current flowing throug...
H: LM324 op-amp wheatstone bridge amplifier formula I'm planning to use an LM324 opamp as a signal amplifier for a cell load (strain gauge in a Wheatstone bridge). This particular application is shown in the datasheet (see image). It shows the Wheatstone brige (bottom-left resistor is the strain gauge) and the opamp i...
H: Emergency light circuit - What is the function of resistors, diodes and capacitor? simulate this circuit – Schematic created using CircuitLab I found this circuit on the internet. In this, the bulb glows when AC supply is OFF and bulb goes off when AC supply is present. So, this functions as a Emergency Light Circ...
H: mosfet capacitance charging question Can someone please explain to me why the output of this level-shifting circuit starts charging from around 2.8V to 5V, and NOT from 3.3V to 5V. At the time where the output is at 5V there is a 3.3V potential at the source and gate terminal. So i thought that the drain-source ca...
H: Voltage for transistors in saturation I need to find the voltage Vi for Q3 saturated with B = 100 for transistors. I did the calculations and then simulated the circuit and i had similar results. the Question is: the analysis is right ? My calculations: If Q3 is in saturation then vce3 = 0.2v and with: 20 -...
H: 12V DC Overvoltage Protection I'm trying to create a air pump system with a rechargeable battery pack. My question is: Because my air pump is a positive desplacement pump, which task is to create a vacuum in a container, will its voltage increase above 12V when the workload increase (because vacuum) and will I nee...
H: With power only on this LCD, will I see anything? If I only connect the VSS (pin 1) to ground and VDD (pin 2) to voltage, will I see anything on this LCD screen (as a test)? Might I expect to see a cursor of some type? Simple data sheet: http://www.mouser.com/ds/2/178/08216h3-11837.pdf Or do I have to send data al...
H: electronic devices impedance and drawing current I have a questions that kind of bugging me for a while. So in electronic devices, it has capacitors, inductors, resistors, transistors and etc. All of these together is the load of the device, which is impedance. From what I understand the impedance lower when the d...
H: Do I really need to put stm32 microcontroller into bootloader mode to program it? I have started learning stm32 microcontroller for a while using a very small development board "stm32f103c8t6" (or blue pill). when I started, I learnt from some tutorials that I have to switch a jumper in order to program it. (The p...
H: Is .95J worth of work within 1 second Equivalent to .95W of Power? This is a question that has two parts to it divided up into two sections. It is similar to the "Is Work done to Transfer Energy?" question but has been refined to include the conversion from Joules of work to it's equivalent Power and if they are in...
H: Is there any risk in storing solder paste and flux in living space? I have solder paste and flux that I regularly use. A lot of times I keep them in my drawer. The solder paste go dry and flux leaks out from the syringe. I have not thought about health risks associated with this practice. Should I store them in a s...
H: Dual Power Supply (Two 9V) I am Not Good At This, and I am trying to breadboard this circuit here: http://www.instructables.com/id/DIY-EEG-and-ECG-Circuit/ But I am stuck on the power supply. The instructions state: Regarding power: the easiest way to power the circuit is with 2 9V batteries. To feed your op-amps...
H: What is the minimum voltage required to operate an AVR MCU at 8Mhz clock speed? I want to run an AVR off the internal 8Mhz RC oscillator without any prescaller and want to make sure I have enough voltage for proper operation. AI: 2.4 volts. Calculated from this graph (which could have more thoughtfully placed guide...
H: What device limits output current such that input voltage is maintained above some limit? I think my problem is that I just don't know the name of this device/circuit, but if someone can provide an outline of how to put one together also, or point me at a device, that'd be a help. The device I seek is a current lim...
H: Why does 10k ohm pull down resistor not work for pushbutton with NOT logic gate? I made the following circuit on a breadboard using a 10k resistor, 100 ohm resistor, LED, and 74LS04 NOT gate. I expected this to work since the input of the NOT gate is at 0 volts when the switch is not on. For some reason, this setu...
H: Can I output one flip-flop into another on the same clock pulse? I have two positive edge octal D type flip flops with output enable (they're both 74LS374 chips), and I am wondering if it's possible to enable the output from one chip and clock the other on the same clock pulse, effectively copying the contents from...
H: Altium Document/Schematic Option Revision field auto value from Subversion How do I instruct Altium Designer to fill Document Option Revision field with the value of current Subversion revision: AI: Use the special string =VersionControl_RevNumber. You can find a full list of strings on Altium documentation. The s...
H: Does electricity always flow in a closed loop and why does current flow to ground? I have been taught that current flows in a closed loop back to the source. And with electrical distribution, current flows to ground because the whole grid is effectively grounded back to the source. Therefore if you were to touch a ...
H: Charging 12v 9ah lead acid battery I'm new to electronics, and need some assistance :) I need to charge a 12v 9Ah lead acid battery from 12v input. How should I start with this? 1. step up to 14V? how much do I loose if I try to charge it from 12v? 2. is there a chip that can regulate the exponential charging proc...
H: LM317T outputs current on Adjust pin with nothing connected between adjust and Vout? I have a LM317T-based simple circuit and I'm using a 12V battery to power it. I connected the Vin to + 12V and made a constant current circuit as shown here. Now, I'm using a variable resistor of 100k instead of a fixed-value resis...
H: Switching and sense circuit The Below mentioned circuit switches 12V when the OPTO sense high voltage The Strings of LEDs is connected to OUT1 and also an SPST switch is also connected externally (not shown in image). The Switch is connected to 12V on side and another side to OUT1. When Switch(SPST) is ON, i.e 12V ...
H: Cortex-M0+ check if running under debugger control I would like to check from my firmware if the MCU is running under debugger control. The MCU is a Cortex-M0+ KE06Z128. On M4 I used to check a bit in DHCSR. Even though this register exists in M0+, it seems to not be available to the firmware (I can't find it anywh...
H: NE555 Based Speed Controller circuit - Contradicting Pins in 2 Tutorials I am a newbie of Electronics and learning it as a hobby. Over a course of time I realized that Electronic Blogs are not the best place to learn Electronics, unless you have a strong basics and can correct silly mistakes in circuit diagrams pos...
H: How can a DC18V ~ 36V LED driver work with DC3.6V LEDs without burning them out? I bought some slightly more powerful leds to build a hobby project and grow some herbs. The kit has 10 LEDs that have the following spec: Power: 3W Voltage: DC3.6V current::700mA It comes with a driver: Output Voltage: DC18V ~ 36V Ou...
H: Having trouble finding the voltage simulate this circuit – Schematic created using CircuitLab I can only solve this using Kirchhoff Laws and Ohm's Law. The first thing i tried was finding the current through R3 , Ir3=1mA (Ir3 = 12/12.10^3 = 1mA). Then using KCL on node A: Ir2 = Ir3 + Ir1 <=> 2 = 1 + Ir1 <=> Ir1 =...
H: Battery size/type depending on desired usage Directly below is the overview of a project that has been working well for around three months. A 6 Watt, 12V LED spotlight powered by a 12V 7Ah sealed lead acid battery, controlled by a timer switch that runs the light for 10 hours a day. The battery is charged by a 12V...
H: Calculate current of resistor with Norton's Theorem I have a problem with the following circuit: simulate this circuit – Schematic created using CircuitLab I have to calculate the following data using Norton's theorem: \$R_n\$ \$A_n\$ \$I_{R_2}\$ For the first I calculate the following circuit: simulate this c...
H: A simple way to detect an AC 3 phase induction motor ON/OFF state Background: There is a 3 phase motor running by an inverter. motor specification is about 1.8KW power and 230/400V and 1.13A. I want to drive another DC motor synchronized with that AC motor so the DC motor goes ON and OFF with AC motor. there is no ...