Questions tagged [input]

Something put into a system or expended in its operation to achieve output or a result

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Design challenges with high input impedance amplifier

After a couple of days of reading (also trying to find similar posts) and trial and error in my simulation tool (TINA) I see no other way than consulting you experts. In my application I have a sensor,...
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Designing a system with desired transfer function

Suppose we have a transfer function H(s) = 1/s+1. Is there a general method by which using electric components we can construct such a system?
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115 views

Is chopping used for the the most precise voltmeters?

Are the most precise nanovoltmeters (e.g., Keithley 2182A) for 1 Hz sampling (i.e., measuring the average over each second) chopping the input stage? I can't tell from datasheets and am curious how ...
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Getting SPDT behavior (with zero quiescent current) from an SPST switch

If you've got an SPDT switch, it's pretty straightforward to use it as a front panel input to some CMOS logic. Even with simple debouncing (no hysteresis, which is acceptable for my purposes), it ...
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STM32 input "source" current

I am working on a kind of voltage meter which will be able to measure positive and negative voltages and will have 2 ranges connected to 2 separate pins of STM32. My problem is that at the most ...
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Net PWMA_IC3 contains Multiple Input Ports(PWMA,PWMA) [duplicate]

I have to give two different PWM Input to my two Gate driver ICs my design. i have taken two output ports PWMA and PWMB hoping, I will make them 180° apart in phase in programming. 2)I want to give ...
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Query regarding MAX20480DATEJ/VY+ voltage monitor

I'm using a MAX20480DATEJ/VY+ voltage monitor for my design. Out of four inputs, I prefer to set IN1 2.5V at the same time for testing purposes. When I'm running my command, I'm constantly getting a ...
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If a device's electrical requirements give a voltage range and fixed current, does the current limit assume the lowest input voltage? [duplicate]

I am working with some small devices and checking input power requirements. Many of the standard labels look like this: Input Power: 100 - 240 VAC, 50-60Hz, 2.5A I am trying to determine how much ...
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How to store bits asynchronously without clock resetting all bits?

I am working on a circuit that has 8 buttons that need to hold the value once pressed. I'm currently using a 8 bit flip flop (74LS273 in the diagram). The problem is that all bits get reset on the ...
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I am adding 1 ohm resistor with a coil in series and an connecting to a 25 W DC source. How to choose the correct resistor of 1 ohm?

I am adding 1 ohm resistor with a coil in series and connecting to a 25 W DC source. How to choose the correct resistor of 1 ohm? Is 1 ohm, 25W resistor is OK for this circuit? Please help. Edit from ...
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Two digital pins for reading buttons, writing to RST

I have an ESP8266 with two buttons connected to pulled-up GPIO4 and GPIO14. The buttons pull the signal down if pressed. I want to reset the microcontroller on every raising edge. I thought about ...
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PIC16F886 and Switch Setup with Diode

I would like to make a simple embedded program that will Display what is happening on and LCD screen. When Switch One is pressed, it displays "Switch One". When Switch 2 is pressed it ...
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2 answers
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No Input to Open Drain Buffer, yet Output Drives Low?

I'm kind of stuck with understanding why the output of an open drain buffer is going low when there is nothing connected to the input. We're using the SN74LVC1G07. Truth table states that if the input ...
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Why is the push button state taking too long to in the program?

I wired up the circuit using a pull down resistor of 10KOhm according the schematic provided. I'm using Jetson Nano (MCU).The push button (DF Robot PB) has three wires, +ve,-ve, and signal, pin 1,pin ...
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Consequences of having an external signal connected to an output of a LVDS Receiver?

I am trying to debug an issue with an LVDS receiver on a fellow colleagues board. They are using an LVDS differential pair from an FPGA to control a reset line on a MPU on their board. For debugging ...
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13 votes
4 answers
3k views

Why does most test equipment have 10 MΩ voltage input impedance?

I'm only speaking for equipment interesting in voltage measurements. Multimeters, oscilloscopes and conventional lock-in amplifiers seem to have mainly input impedances of 10 MΩ. I understand the need ...
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1 answer
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How to interface MCU with open-collector output?

I have a 3.3VDC microcontroller (based on Nordic nRF52840) with digital inputs which I need to interface to a device that outputs slow pulses (1 second) via an "open collector output". The ...
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Why does Raspberry PI reduce input voltage on GPIO Pin?

We have a cadence/pace sensor for a bike, and we want to retrieve the "sin" by plugging it to a GPIO Pin of a Raspberry PI. The signal "sin" has a voltage that varies between 0 and ...
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1 vote
2 answers
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Best way to detect any combination of keypresses with few pins? (not just single key presses)

I ask for the "best" way, but a "typical" way or a "better" way will be appreciated. A great way to detect a single keypress among a bunch of buttons is to use a resistor ...
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Panasonic RX-DT860 mod, how to unmute audio signal?

I have this older terrific sounding Panasonic Boombox RX-DT860 (huge!) and the laser unit of the CD-player died and cannot replace it. The Boombox also lacks an AUX-input, so time to change it, time ...
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-1 votes
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What rating of SMPS is perfect input to buck converter for 10A output

I'm having a 10A DC-DC Step Down Buck Converter, suppose I want to get X volts and Y amps at output, so do I need to have input DC of rating more than X and Y ? or how to decide input rating? Now let ...
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How do you design a logic circuit diagram, when there are 2 inputs and each input has 2 values?

So I came across this problem, where the conditions of the output (P, Q, R) will be set to high (1) if the condition is true: The conditions are: Output P : A > B Output Q : A = B Output R : A &...
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2 votes
1 answer
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How does this 4050 IC input protection circuit work?

While reading through the 74HC4050 datasheet I came along this input protection circuit. In order for the mosfet to turn on the gate voltage has to be more positive than the source voltage though they ...
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Intel FPGA input voltage between Vil and Vih : what's happening?

Considering these settings: Cyclone 10 LP (or Cyclone II / Cyclone III / Cyclone IV) IO configured as Input LVTTL 3.3V (Vilmax=0.8V Vihmin=1.7V) Voltage between 0.8V and 1.7V on this input No CLK ...
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2 votes
1 answer
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Electrical Voltage Conversion Confusion [closed]

so my friend bought a drumset from America and had it shipped all the way here to Amman, Jordan. Of course im going to need a convertor for the voltage difference between the 2 countries. However I'm ...
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Pulse duration detection evaluation (opto) LT-22222 from dragino

My question seems simple but i can't find the answer on documentation. (or I don’t have enough skillz) I have this energy meter with pulse output: https://cdn.store-factory.com/www.compteur-energie....
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1 vote
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73 views

Protection of the pins of an electronic board against overvoltage due to a bad connection

I designed an electronic board with two inputs connected to an ADC (MCP3202), one output connected to the output of an AOP (INA105) and a 24V battery supply. My question is: is there a way to protect ...
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STM32G0 Seems to output 0.77 V on the input pin when set to high impedance and nothing else is connected to it, why does this happen?

Currently I have an a pin on an STM32 set to be an input and floating (high impedance). When the device it was measuring from was powered down and nothing was going on I was measure about 0.35 V on ...
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Piezo connected to ESP32 - Why doesn't it kill the input?

I have a ESP32, and a piezo disk connected as a sensor: Piezo - to GND Piezo + to Analog In 50K Resistor in parallel to piezo My understandin is that the piezo generates a voltage when it is ...
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ESP32 - Read multiple analog inputs

I need to read multiple analog inputs as fast as possible on a ESP32. With as fast as possible, i mean that ideally all inputs are read simultaneously. Currently I simply read them one after the other ...
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2 votes
2 answers
275 views

Is there a way to measure the Phase Shift between the input and the output voltages related by the equation: \$V_o = V_i(a+jb).\$? [closed]

Say \$V_i\$ is an input voltage, and the output voltage is given by \$V_o = V_i(a+jb).\$ Is there a way to measure the Phase Shift between these input and output voltages?
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1 vote
1 answer
283 views

Is 3.5VDC going to damage an stm32 analog input?

I have a pressure transmitter sensor that is supplied with 5VDC and provides 0.5-3.5VDC analog value within a pressure range of 0-4bar. The system that I'll be using the sensor within, will almost ...
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2 answers
66 views

Is it possible to read the value of a switch in another active circuit?

I have a magnetic lock with an integrated switch (NC when locked). The lock opens when supplied current and stays open even after the current is no longer supplied (until someone manually closes the ...
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Impedance value effect on voltage measurement

When I measure voltage of, for instance, the open circuit voltage at low luminous intensity of a photodetector with ADC Adruino Uno an offset appears. The value is good if the photodecteor (here an ...
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2 votes
2 answers
641 views

What will happen if the input voltage of the buck-boost converter goes below the recommended input?

I am doing a solar panel project, but I don't have much knowledge about electronics. I am planning to use a buck-boost converter that gives me a stable output (12V.) What happens when the input ...
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How do I convert a switch’s single output into a double output per keypress?

I am new to electronics compared to many here I’m sure, but I have some experience with Arduinos and basic circuits and PCBs. If for example I had two mechanical keyboard switches wired up to an ...
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2 votes
2 answers
292 views

Amplitude vs Magnitude

Consider the relation between the output and input voltages: $$V_o=\frac{V_i}{2}(j-1)$$ where j is an imaginary number, and $$V_i=5sin(1000t)$$ Now, to find the amplitude of \$ V_o \$, should we look ...
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how this equation is obtained for calculating input capacitor of a fly back presented in UC3842 datasheet?

i know that it refers to stored energy formula for a capacitor according to voltage variations. but i dont have any idea about the specified part. where did this part come from? https://www.ti.com/lit/...
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1 answer
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Different output for recliner power supply safe to use 25V 2.5A to a 29V 2A [duplicate]

My father broke his power supply for his recliner. He's on oxygen 24/7 and I was trying to find out if it was safe to use a slightly different power supply cause I can't find an exact match. The one ...
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1 vote
2 answers
85 views

input parallel capacitors for rectifier in flyback

When should we use multiple parallel capacitors instead of a single one in input rectifier topologies of switching converters such as flyback?? What are the advantages and disadvantages?? thankfully
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-1 votes
1 answer
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Power-supply input power problem; single phase 220 V AC need to connect to 3-phase multi-voltage (208~520 V AC)

I bought POWER SUPPLY 3-PHASE, SMOOTHED. I used previous power supply 1-phase as following condition; Previous supply spec.: 960W 24V 40A Input: 1 phase 2 wire Output: 24V DC / around 20A Load: ...
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ESP - measure time between two inputs in high speed

I have a ESP32, and have 4 digital signals. At the beginning all 4 are low, and as soon as any one of those goes high, the other 3 follow up. I would need to measure the time between the first one and ...
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1 vote
1 answer
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How to opto isloate a pin and still use it as either an output or input at will

I am looking for a clever way to merge the two circuits. I want the freedom to configure the pin as input or output but still have the isolation. Not sure if this can even be done but I am for ...
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0 votes
1 answer
62 views

Arduino reading data from 82 different sources [closed]

I want to make my own electric darts. Whenever a dart will hit the dartboard I need to get the dart location to my Arduino so I can count the score. The problem I am facing is that the dartboard has ...
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2 answers
89 views

Keyboard USB transform

I want to press a key on my keyboard, for example "a" and a device should take the scan code of the button I pressed and transform it to something else: e.g. "b" or the scan code ...
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0 answers
55 views

Connection of TRRS microphone not TRRS headset

I know for headset T- Left R- Right R- mic S- Ground But for only microphone T - unknown ? R - unknown ? R - mic S - Ground What are those unknown? I want to plug it to my computer which has separate ...
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2 votes
3 answers
859 views

Should I buffer my analog input?

I've been using an Arduino's analog input to read a resistance. The resistance is typically from an LDR or from an adjustable resistor. It's working fine so far. I have 10 bits resolution, usually I ...
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4 answers
177 views

As a general rule, should input pins be protected with a series resistor?

I have read this article about why and how protect input pins. The article mentions the specific scenario of industrial electronics, with the input pin conneted to a long wire. However, if the input ...
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1 vote
1 answer
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Should I consider this 1.57V open pull-up pin on ESP32 faulty?

I'm working with a ESP32 NodeMCU32 dev board. When I set INPUT_PULLUP on pin 23, and measure its voltage, I get 1.57V. If I do the same for pin 22, I get 3.23V. ...
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Does this require a larger series resistor?

I am connecting a switch to an input pin on a Nexys A7-100T FPGA development board, like shown in the below image: The circuit has a 10K pull down resistor (R1 on drawing above) to ground and the ...
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