Questions tagged [input]
Something put into a system or expended in its operation to achieve output or a result
534 questions
2
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What are some ways I can get an LM5176 buck-boost converter to operate down to 2.5V input voltage without a separate power supply?
The datasheet for the LM5176 says it can primarily operate with an input voltage between 4.2V and 55V. However, the datasheet also says it can operate down to 2.5V input voltage, but only if the BIAS ...
- 343
0
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5
answers
138
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How to protect a μc IO pin that might see voltage when μc is off but must read it when μc is on?
I have a small voltage source which I'm using as a detector for power in another circuit. It connects to a microcontroller pin. Sometimes it's active when the microcontroller is not powered up, but ...
- 201
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0
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29
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PIC32MZ not detecting when quadrature encoder is turned
My Problem
I'm trying to interface a quadrature encoder, this one, to a PIC32MZ. I made a simple test to check the functionality of the encoder, but I cannot get the Input Capture peripheral of the ...
- 190
-1
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1
answer
74
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Problem about inputs (zones) of a security system [closed]
I have a couple of questions regarding home security control panels and PCB design that I hope someone can help me with.
First, I'm curious about the circuit and components used in the zones of a home ...
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1
vote
1
answer
135
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How can I select one of two identical USB power sources while blocking out the other?
I am trying to design a keyboard with two USB-C inputs that connect to host. I decided on using a HD3SS6126 for switching logic.
HD3SS6126 datasheet.
I would like to make it so that when one of the ...
- 11
2
votes
1
answer
108
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Confusion in deciding a voltage regulator's input output capacitor types
As a part of a PCB, I want to use this AMS1117-3.3 voltage regulator with 22uF input and output capacitors as follows:
As for the exact part for the capacitors, I was planning to use this X7R ...
- 4,385
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0
answers
27
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Protection still adequate?
I'm trying to protect an analog input (that goes through a MUX and a buffering op amp). Expected input frequency is less than 10 Hz.
I would like to go from the top schema to the bottom one.
LDR/...
- 293
0
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2
answers
89
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Circuit that offsets input voltage to exactly 0 V
I am looking for a (op amp) circuit to offset \$f(x)= \log(x)\$ always to zero. More comprehensible is the explanation on the x-y plot below.
Basically, it is possible to offset the voltage with an ...
- 19
0
votes
1
answer
45
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Bulletproof automotive drycontact input switch with constant current opto driver
Please comment on this circuit. I want to make sure a push button input SW? is as robust as possible before it goes into my processor after the U12A buffer.
0
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2
answers
85
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What happens if misconfigured input GPIO delivers 3.3V if it is connected to 3.3V to detect high?
Let's say I have GPIO0 on an ESP32 which is configured as input pin using an external 4.7K Ohm pull-down resistor to ground. Default state therefore is low. When I ...
- 484
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0
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43
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Difference between Vid and Vidr
I have two different operational amplifiers datasheets with absolute maximum ratings. The TI LM358DR has a differential input voltage specification (Vid) of -32 V to 32 V, whereas the OnSemi LM358DR2G ...
- 7,793
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1
answer
51
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Effect of low pass filter in ADC when the pin direction is changed from input to output
Consider a circuit to measure ADC :
The ADC pin is changed from input to output every 5 seconds and the pin is read for analog value.
Every 5 seconds it is made high for 100 ms, low for 100ms and ...
1
vote
1
answer
69
views
Input ranges exceeding rails in opamps & comparators
With opamps & comparators datasheets I've seen, it was typical to show in absolute maximum ratings values such as:
$$V_{SUPPLY} (V_{DD} \; to \; V_{SS}): \quad 12V$$
$$V_{DIF\_IN} (V_{-IN} \; to \;...
- 409
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1
answer
44
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Terms for pressure sensitive pads
I'm working on a project that needs pressure sensitive input, and I'm a bit lost on the lingo for parts. What would be a good search term to look for parts that describes a pressure sensitive pad that ...
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1
vote
1
answer
81
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Reusing an output in Falstad
I'm simulating a logic circuit in Falstad and a particular output X is used multiple times in the circuit. Can I take input as X without drawing many wires from X?
- 129
1
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1
answer
57
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STM32G030K6 24V on input pins with internal protection diodes
I have 24VDC signal and I want STM32G030K6 MCU to detect it (state low/high). I know this MCU has internal diodes on some pins, connected from inputs to VDD and max positive injected current is 5mA. ...
- 11
0
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1
answer
37
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Max voltage per pin when measuring differential voltage with MCP3422
Im measuring differential voltage over a 1 Ohm (shunt) resistor at max 1 Amp, load voltage is 12V DC using one of the channels on MCP3422. MCP3422 is powered from 3v3 DC.
The datasheet https://ww1....
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0
votes
1
answer
39
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What ESC matches criteria? [closed]
Is there any ESC, that takes PWM from an Arduino as an input, has three wires for three motor phases and has three wires for the hall effect sensors? Does this match my criteria Product ?
- 13
2
votes
1
answer
81
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IC 74HC08 can the output drive the input without destroying it? [closed]
i made a circuit with a 74HC08 and i wanted that when the output is high(1Y) it would take over contact (1B) with a led between it .and the input B connected to ground with a 20K resistor it works ...
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0
votes
3
answers
194
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Modify headphone jack to not mute speakers when plugged in (Yamaha HS4)
I have a set of speakers with an additional stereo headphone output on the front. As it is now, when the headphones are plugged in, the speaker mutes, giving output to the headphones alone.
I want to ...
0
votes
1
answer
56
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How to increase the Atmega32A input output pins
I’m using ATmega32A to control a system which have a 30 outputs and 30 inputs. The issue is that the ATmega32A have only 32 DIO pin which can be use as input output pins.
So how can I increase the ...
0
votes
1
answer
33
views
Led blanking while the DIO_Read is LOW and work well while DIO_Read is HIGH
I'm trying to read digital 24v in MCU so I used a voltage regulator to step it down to 5v then I got the 5v to pull down resistor with a transistor like that
then I get the V out to the MCU pin which ...
-2
votes
1
answer
56
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Polarity free dc circuit module [closed]
I am looking for a chip or a circuit module in which the output will be dc voltage in certain pins positive + and negative - , no matter how the dc input is connected, normal +- or or reverse -+. The ...
1
vote
2
answers
67
views
Coupling class-D output to audio input of another device
I have a MAX98357 with a class-D output stage that I want to use as the audio input to another device.
The other device has a high-impedance (around 2.2 kΩ) input and ground connection.
I was thinking ...
- 11
0
votes
1
answer
75
views
Input stage for sampling audio sine wave with ADC
I'm building a prototype, checking the potential for a project.
I want to be able to sample a sine wave from a power amplifier using a Teensy4 ADC.
I have a Teensy 4.0 powering an Evisun isolated DC-...
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1
vote
4
answers
244
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Understanding input pins [closed]
I am trying to gain a better understanding of input pins. As per my current understanding, they act as a voltmeter with super high resistance and are connected to the ground on one side. When ...
- 11
0
votes
1
answer
49
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Transmitting input through USB from microcontroller [closed]
I am making a device, similar to a cross between a controller and a mouse, and I wondered how I would send input to the computer.
For example:
Transmitting movement, buttons pressed etc.
Also, how ...
0
votes
1
answer
83
views
Direction of Op Amps Input Bias Current relative to declared sign on datasheet
Input Bias Current is a parameter of Op Amps related to the Base/Gate currents flowing in or out of the differential amplifiers at the input of the amplifier. It is calculated as the average value of ...
0
votes
2
answers
49
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Choosing points for analysing equivalent resistance
I realized there is something fundamental about equivalent resistance I don't understand in terms of application. I understand the part about mechanically simplifying resistors into one resistor, just ...
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0
answers
44
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How to get a voltage range of -1.5V to 1.5V using batteries combination of 3V and potentiometer
How to get a voltage range of -1.5V to 1.5V using batteries combination of 3V and potentiometer.
So for the details, I'm using batteries of 1.5V each, which are connected in series such that output is ...
0
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0
answers
43
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How can I increase the output voltage without changing the motor and turbine design?
I made a small hydropower project for school. Water flow rate is too low. I attached 24 V DC gear motor. The output is 4 V. How can I increase it?
I can not change the turbine dimensions and motor and ...
1
vote
2
answers
175
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Correct way of optical input EMC protection
I tried to find an answer online, but didn't find anything that would make my doubt go away.
The thing is: when you want to protect any input, that is referenced to ground, you use ground-referenced ...
- 43
1
vote
0
answers
82
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Circuit Design Explanation
Can anyone tell me how this circuit will work? I have a AI (analog input) 0-10 V / 4-20 mA and a AO (Analog Output) 0-10 V. I only have one IO pin from ESP32 from which I will use to get AI from a ...
1
vote
1
answer
320
views
Unable to open input file in Verilog
I'm having trouble running my Verilog code.
Here is my code:
module hello(A,B);
input A;
output B;
assign B = A;
endmodule
And here is my testbench:
...
1
vote
3
answers
598
views
Button multiplexing supporting multiple simultaneous button presses?
I'm looking to build a MIDI controller from some hardware I've salvaged, which includes 30 non-latching buttons and 30 LEDs. I'd like to base the system around an Arduino board (specific type TBD ...
- 13
1
vote
3
answers
148
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What is the cheapest way to connect a 12V input into a PIC?
I have a pushbutton which delivers 12V when is pushed. I want to connect it to a PIC12F1572 input pin. What is the proper way to do it?
My idea was to use voltage divider to reduce voltage under 5V ...
- 67
1
vote
1
answer
58
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Usage of power supply with different output than input of consuming device [duplicate]
I'm about to use a power supply with output of 29V 1.8A for a device (linear actuator) with an input of 12V 5A. Is this a good plan regarding functionality and safety? I'm not even sure if this is a ...
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2
votes
1
answer
118
views
Transformer changing voltages at input
I have a confusion regarding the input voltage of the transformer. Is it necessary that the input voltage of the transformer should change its direction. If I give an input voltage, a sine wave but no ...
user340506
0
votes
1
answer
81
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Identify types of circuit(s) that would function as stated
I am trying to build a circuit that will have a trigger input, a clock input and an output that is (10) pulses at clock frequency for each trigger pulse.
Would it be multiple circuits (chips) or just ...
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0
votes
0
answers
143
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Capture/Compare Input Mode is not being triggered by PD12 on STM32F407 Discovery
I am trying to set a pin with capture/compare input mode and I will get the trigger from the PD12 pin which we have a green LED.
When I open the debugging mode, I see no change on the "timestamp&...
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1
answer
316
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5V, 50 Ω input single pulse signal to an FPGA
I have a 5 V, 50 Ω input single pulse signal (<1 ms pulse width) going into Trenz TE0711 (operating @3.3 V and 50 MHz clock). Since the input signal is too high of a voltage, I am trying to find a ...
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1
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1
answer
117
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Screw terminal damaged in input 230 V three-phase power supply
I use screw terminals for a 230 VAC three-phase power supply, but it blasts in many PCBs, so I want to replace it. What would be a better solution?
0
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1
answer
102
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How to command several devices simultaneously from MCU?
I want to control several devices using one MCU. Each device will receive either 1V or 3V depending on the application. I want to use only 2 analog pins from the MCU to send either 1V or 3V to several ...
- 99
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1
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328
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Using 0-3 V sensor with 0-10 V PLC
I have a sensor that generates an analog 0-3 V output signal. I would like to connect this sensor to a PLC which has only 0-10 V analog inputs.
My questions are:
Is this recommended to do in general? ...
- 407
1
vote
3
answers
566
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Pull-up resistor and series protection resistor
Sometimes, you see a pull-up resistor in combination with resistor that's in series with the microcontroller input pin.
If combined with a capacitor, it can provide some basic filtering (RC-circuit).
...
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votes
2
answers
678
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How do I successfully transfer MIDI OUT signal to Windows 7 (32 bit) Desktop PC? [closed]
Things I have:
I have an old type MIDI input device (Piano Keyboard Panel) which has a MIDI "OUT" port (female type jack) that has 5 holes. (and no USB port). it has a 9V power input (AC ...
user107801
0
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1
answer
156
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What is the correct way to measure DC power at the input of a multilevel inverter in a Simulink simulation?
I modelled a 11 level cascaded multilevel inverter, and I would like to measure the power at the input of the inverter, so I do not know how to properly evaluate the actual input power of that ...
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1
vote
1
answer
412
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PIC16F628A input not working
I am using PIC16F628A, MPLAB IDE to coding and Pickit3 to write the code into MCU. The code works on Proteus but does not in real world. I setted A0 pin as input. It should count up normally and count ...
- 25
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0
answers
293
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Combine two circuits in Multisim
I have two circuits, two separate simulations in Multisim, which work fine until I try to combine them.
I tried a common ground, on-page connectors, added the voltage follower, but that didn't help.
...
- 5
0
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1
answer
318
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I can't get output voltage from flip-flop in PSpice
I'm simulating a flip-flop in PSpice, but it doesn't show an output voltage.
This is testing a flip-flop; look at the Q output. It shows X (undefine). I don't know ...