Questions tagged [input]
Something put into a system or expended in its operation to achieve output or a result
363
questions
0
votes
2answers
64 views
How to make a sawtooth waveform look less like a staircase (DAC)?
I am making a 4-bit digital-analogue converter using an adder circuit with four inputs. Each input is a square wave of a specific frequency. The output of the DAC is meant to be a sawtooth waveform ...
0
votes
0answers
85 views
How should I connect 5 buttons to arduino so that I can use the least number of inputs all the buttons are connected to ground [migrated]
The problem here is that I want to connect 5 input buttons to an Arduino but I do not want to utilize 5 input pins of Arduino, is there any matrix like connection using which I can reduce the number ...
0
votes
3answers
36 views
Output drop/change in linear circuits
Lets say I have a linear circuit with some input and output voltages. Assume this is a block with inputs/outputs. When I connect input of another block to the output of my first block, I observe that ...
37
votes
8answers
3k views
Add a passive hardware token using a 3.5mm jack
I have a box that I made for my niece, which allows her to exchange voice messages with me. It is powered by a Raspberry Pi and features two buttons, a LED, a microphone and a speaker.
Now, for ...
0
votes
1answer
34 views
AVR ATtiny1634 - PB3 as Input and Watchdog Timer
I'm quite a beginner in AVRs and this is my first project soldering the microcontroller and programming it on board. I know the ATtiny1634 QFN might not me the best micro for a beginner, but ...
1
vote
1answer
48 views
What is Hang Input in Logic Design?
When it comes in Digital Logic Design using IC (Integrated-Circuit) what is the term HANG Input means? what does it do? and how will it affect the output of the IC?
1
vote
2answers
75 views
Illuminated LED and push-button using only 2 wires
I want to make a circuit with an illuminated LED push-button that is far away from the input board and I only have 2 wires available. The push-button is not something specific. The input board will ...
0
votes
0answers
32 views
Common Collector Amplifier - Explanation?
I am new into electronics, and I dont get it how we find input and output impedance of Common-Collector Amplifier. I mean, I dont know what we are looking at when we are trying to find input and ...
0
votes
1answer
31 views
L293d, Input Voltage Specification
I have made project " DTMF Based Land Rover ".
The whole circuit is working in usual manner. The voltage at arduino output pins is 3.46 volts.
And pin no 16 and 8 are Vcc of L293d respectively
So ...
0
votes
0answers
33 views
ESD Input protection on low Vmax digital inputs (3.6v)
I have a microcontroller monitoring a few digital inputs. The max voltage on these inputs is VCC + 0.3v. VCC is 3.6v so these inputs can't be higher than 3.9v. These digital input are just switch ...
4
votes
2answers
141 views
How to protect input against both ESD and reverse polarity?
I need to protect an external input on a device against both reverse polarity and ESD (IEC61000-4-2 +-8kV). The normal input is +5V dc at 100-200mA; the reversed input could be -5V and that should be ...
1
vote
2answers
79 views
What does an U244B IC’s input voltage do?
I’m new to electronics and I’m trying to connect a U244B ic on a breadboard. One pin says it’s an input voltage (pin 7). It works without anything being connected to the input and with battery ...
0
votes
1answer
83 views
timer input capture for really low frequencies
How low of a frequency can a timer be used to measure an external signal in "input capture" mode?
If I need to measure something that has a frequency of say 1hz - 2hz... or even slower for that ...
3
votes
3answers
215 views
What is meaning of active low input in combinational logic circuits?
I am currently doing self study on combinational logic circuits. I encountered few terms like active low output, active low input. I understood what active low output means (putting not gates at ...
11
votes
4answers
3k views
Where Does VDD+0.3V Input Limit Come From on IC chips?
There are a variety of integrated circuits that specify that their input voltage can span a fairly wide (absolute maximum) range, e.g. -0.3V to 6.0V (ref, pdf page 4), and then have a "Input Voltage ...
0
votes
2answers
118 views
NVG compatibility LED Lights
For an avionics application I need to make a keypanel which has NVG compatible LED lights behind its keys. I am trying to understand how does the NVG compatibility (Night vision Goggles) relates to ...
0
votes
2answers
48 views
Interconnect 5v - 3.3v
Is this correct to connect 5v outputs and 3.3v inputs ttl logic via an open drain transistor and an internal pull-up resistor on the digital input?
I suspect the 5v part can influence to the 3v part ...
1
vote
1answer
24 views
Input range for TPA311x
I'm reading through the datasheet of the TPA311x family.
I'm looking for the input range for pins INPR and INPL but I cannot find this information. I see the absolute maximum ratings, but it's not ...
1
vote
0answers
38 views
What is input to the RF power amplfiier (gate of the MOSFET)?
I have read that the RF PA is a block just before the antenna. So, the input to the RF PA (voltage signal at the gate of trasistor in the PA) should be a modulated signal and thus the PA just does the ...
1
vote
2answers
55 views
Consequences of leaving unused inputs of clock buffer floating. Alternative: best practice
I'm using a Si53342-B-GM
Original datasheet download at silabs for the si5334x-series
as a clock buffer.
In some cases I only need to distribute a single clock signal and in some of my cases I ...
0
votes
1answer
70 views
How does the logic board know the buttons have been depressed on the Philips ACC2330 foot pedal? [closed]
Unlike other input devices like an Xbox controller, that has the buttons
physically mounted to the logic board, this foot pedal's logic board has
absolutely no apparent connection to the buttons. How ...
0
votes
3answers
72 views
Contact Closure over distance
I have a contact (pushbutton) that's about 10 metres away of a Raspberry Pi.
However; it behaves quite erratic and would trigger when for example an exhaust fan is started in proximity of the wire. I ...
0
votes
0answers
75 views
Are these input jacks the same?
Apologies for the dumb question. I am wondering if these two input jacks the same. Here's a stereo 1/4" jack designed for a guitar with active pickups:
https://www.realparts.com.au/electronics/jacks/...
0
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0answers
17 views
Connecting balanced output with unbalaned input using adaptor
I want to connect my audio interface (balanced TRS jack output) with guitar pedal (unbalanced TS jack input) and I wonder if this kind of adapter will work:
https://www.amazon.com/dp/B001JYSMV0/ref=...
0
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0answers
24 views
Combined 25V/OPEN and 25V/0V Input circuit
I am designing a board for digital inputs in which I will be receiving 2 types of inputs, 25VDC/OPEN and 25VDC/0V, 10 inputs each.
The input signals have different specs but is it OK to design same ...
0
votes
1answer
73 views
Connecting balanced low impedance output with unbalanced high impedance input
I want to send the signal form my audio interface to the guitar pedal effect. I'll use interface's line out balanced output and plan to plug it in to the effect pedal which has high impedance ...
0
votes
3answers
122 views
Is it a good practice to use resistors for MCU inputs for this case?
I want to use Arduino Uno or a Nano which uses ATMEGA328P as micro-controller.
D2 is now set as INPUT. During the start up I want the MCU to detect whether pin D2 is HIGH or LOW depending on the ...
0
votes
1answer
155 views
STM32F4 input capture
How can get input capture values from STM32F4 for measuring the duty cycles of the four different signal?
Here is one channel code:
...
0
votes
1answer
123 views
Burned Up Trace on Input Cap
I'm working on a fairly simple PCB that interconnects three arduinos. There are also MOSFETs for switching some solenoids. The system runs off of a 24V DC power supply. I was running a LM7812 voltage ...
0
votes
1answer
108 views
ESD protection diodes on audio inputs / outputs?
I'm building a digital audio device with 1/4" stereo in and outputs that connect to a CS4272 codec. I'm wondering if and where I should place esd protection diodes.
Pictured below is the analog part ...
0
votes
1answer
53 views
When using mA on analog devices, does the other wire go to 0V or Earth?
On the Schneider analog input module (link) we have IC, IV, IS, 0V and Earth terminals for a single channel.
I've seen people connecting the signal wire from a transducer to the IC terminal and the ...
1
vote
0answers
49 views
Input of BLDC motor
Among the brushless DC motor, is there a motor with two input wire?
I thought that bldc motors with hall sensors should have 2 input, but it was hard to find such one. Is it wrong concept about bldc ...
2
votes
1answer
81 views
Can I Use a Transformer to feed a Mains current to a RPI GPIO pin
I have a standard mains (240v) motion detector that activates an outdoors lamp. I want to notify my Raspberry Pi when the lamp is activated.
My plan is to use a 240v to 3.3v transformer that I have ...
0
votes
1answer
110 views
Pic Programming - Nested Loops
I'm having some problem with my code and I can't get my two loops working properly. I'm new to C programming so I might have got the basic loop concepts wrong. I've got 10 LED lights connected to my ...
0
votes
1answer
46 views
Eliminating power-on state changes caused by input signal fluctuations
I have a circuit that uses several comparators to read an analog input signal and control some downstream digital logic. When the device powers up, the logic states fluctuate because the input signal ...
1
vote
1answer
51 views
Voltage source & current input
I am working on a project where I have a current source (analog output from a PLC) controlling a VFD. Based on the position of the dipswitch, the VFD will accept either a current or voltage input. The ...
0
votes
0answers
42 views
Allowing different inputs without needing to alter gain every time; a situation for a pre-amp?
The goal
I am attempting to make a small diy bookshelf speaker system using 2 16ohm, 25 watt speakers and a 2x25 watt class d amplifier board. If it matters, the amplifier board is a class d amplifier....
1
vote
6answers
216 views
Optocoupler Characteristics
In my application I need to isolate a PWM signal @ 1 kHz, which is generated from a Beaglebone Black microcontroller. In my signal, I want to have one hundred different steps in duty cycle (from 1% to ...
0
votes
0answers
41 views
Comparator resolving input voltages close to vdd
I have a design problem to solve. The problem statement goes as follows:
"Design a clocked comparator resolving input voltages close to vdd dissipating less than 100 uA".
What does "resolving input ...
0
votes
3answers
547 views
Amplify an Electret Microphone using an input Jack 3.5mm
First time on the platform, I will try to be as clear as possible, and electronics is a hobby for me, so I'm open to any welcommed criticism.
I'm trying to build a little project, recording the sound ...
3
votes
1answer
398 views
Op Amp input protection
I was looking for an Op Amp input protection circuit and the most common I found looks like this.
When the voltage at Input Signal goes above/below Op-Amp's supply ...
0
votes
1answer
66 views
Motor/MOSFET Does NOT React To Input On Breadboard
So I have tried so many different variations on breadboard of this circuit but the motor seems to just be powered by the power rail on breadboard. It does not react to any change in the input and ...
1
vote
1answer
61 views
GPIO Configured as Input OR Output
Is it possible to identify looking at the schematics whether a GPIO pin is configured as Input or Output pin for the case in following image?
PIN93 and PIN94 of a MCU are connected directly with ...
1
vote
2answers
157 views
Several Questions About Analog Input
I am new in the automation industry, and now I am focusing on learning how to wire correctly analog inputs in detail, since last time I tried I damaged the module input because of wrong wiring.
Here ...
0
votes
1answer
54 views
Calculate input resistance of power amplifier
how can I calculate the input resistance of this circuit?
Thank you!
0
votes
2answers
53 views
What's the use of the 4 outputs of a power entry module (Qualtek 864-10/009), and how to interpret it's circuit digram?
Main question: What is the purpose of having 4 outputs?
If I only had pins 1 & 4, I would be able to use 115VAC when it's set to 115VAC, and 240 VAC when it's set to 240VAC.
For 240VAC setting:...
0
votes
1answer
84 views
How to find the output voltage of a system with a computing amplifier?
I got a question regarding the following system.
The only given value is the input voltage $$U_e = 8V.$$
Now the task is to find the output voltage $$U_a.$$
My question now is how do I find this ...
1
vote
2answers
474 views
Difference between input current and supply current?
I am reading and trying to understand datasheet of ICs.
I am reading this datasheet now : http://www.ti.com/lit/ds/symlink/sn74hc00.pdf
In the table 6.5, there are two parameters namely Ii and Icc. ...
2
votes
0answers
122 views
Signal conditioning for piezo shock-sensor digital input
I have a piezo element glued to a piece of material, and I want to get a digital signal (to drive an interrupt on an Arduino) when something strikes the material. So, there's a certain noise floor on ...
0
votes
1answer
73 views
What happen to a dff(flip flop) without input?
I have this question but I don't know what happen to a dff without an input is it always 0 ?? like this picture below the 2nd dff hasn't any d ??? Also, if someone can draw the answer of the question ?...
