Questions tagged [input]

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

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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 ...
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27 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 ...
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1answer
59 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 ...
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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/...
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15 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=...
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23 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 ...
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1answer
58 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 ...
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1answer
100 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: ...
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1answer
92 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 ...
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41 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....
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38 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 ...
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1answer
63 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 ...
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1answer
47 views

Calculate input resistance of power amplifier

how can I calculate the input resistance of this circuit? Thank you!
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1answer
76 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 ...
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1answer
70 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 ?...
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1answer
252 views

Input filter on differential amplifier input

Hi, I need to determine the transfer function Vout/Vin. A traditional differential amplifier transfer function without the 2.2uF on the input side would be G1 = (Z2/Z1)*Vin, where Z2 = (2.2uF // ...
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1answer
127 views

Assigning specific bits of vector to outputs in verilog ucf

When I set up my module, I have code like input signed [7:0] SIGNAL but in the UCF I want to assign each bit individually. Currently my code in the UCF looks ...
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54 views

MCP4922 buffer feature

I'm using the MCP4922 as a dac with some different python programs. I am using this python package which has a setVoltage_buffered(channel, value) command. To quote ...
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1answer
58 views

PIC16F883 over 12V input with resistors?

I am using a ADM00308 with a MTS2916A driver development board from MicroChip. There is a serial port RX & TX which can be programmed into an input. I'll use those inputs to drive the motor a ...
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2answers
73 views

Arduino NANOs sharing input signals and controlling Pixel Ring blowing up

We're a bit stuck on the following problem : We've connected a bunch (18 to be precise) of Arduino NANOs on the same +12V supply and they all share the same PWM output from another device (which goes ...
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1answer
36 views

Maximum input capacitance of IO-Link-Device on C/Q

I have a bit of trouble understanding the IO-Link-specification concerning the input capacitance of the C/Q-pin. The specification says in table 7 (line 754): CQD Input capacitance min: 0 max: 1,...
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2answers
165 views

Audio ADC voltage level SNR question

I keep looking for Audio specific ADCs and the majority of these devices work at low voltages on the analog circuitry (5V for example). Lets say we want to process an higher voltage audio input ...
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0answers
148 views

Diode populated keyboard matrix: Wire two separate buttons to the same output?

I have an encoder board for a 16x8 row/column switch matrix. An absolute beginner to electronics but using all of the great online resources for research the best I can. However, occasionally it turns ...
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45 views

How to decide maximum input current required in linear charging method?

I am using MCP73213 IC for my charging application. I would like to use the maximum capacity of the IC for charging. i.e., 1 ampere charge current during constant current charge cycle.And input ...
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3answers
314 views

Analog Input Voltage for Agilent DSO-X 2002A Oscilloscope

How can I find the minimum analog input voltage for an oscilloscope? I've checked the datasheet for the particular one I am using(Agilent DSO-X 2002A) and only the maximum input voltage is listed.
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1answer
63 views

How to determine a system is stable without knowing the input?

I was doing some exercises for an upcoming exam and ran into this. I am not sure how to find if the system is stable without knowing the actual input (since Routh array is the only method I'm familiar ...
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65 views

Too low voltage on digital input on attiny45

I'm using one of my attiny's pins as digital input. I am using a 2k2 pulldown resistor on the input. I am applying a simple square wave generated by a separate waveform generator. The high state for ...
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1answer
382 views

Can I use MOSI, MISO, SCK pings for reading input in AT89S52?

I am doing a custom keyboard for my project. It has totally 22 keys. I am using AT89S52 microcontroller. I have allocated P0.0 TO P0.7 AND P2.0 TO P2.7 AND P1.2, P1.3, P1.4 (totally 19 pins) which ...
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3answers
163 views

Can I use an RC network somehow to allow reading of initial values from jumpers into a micro controller?

I completed a microcontroller project but I want to add a feature where when it starts up, it can read a 4-bit value defined by on-board jumpers (jumper closed = logic low, jumper open = logic high ...
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1answer
206 views

How to connect from a +/- 15v audio circuit to single powered amplifier

I built a 3 WAY CROSSOVER (ELLIOT SOUND CIRCUIT) with +/- 15v supply. I have found small class D amplifier for Mid AND high amplifiers. They are single sided power. Can I simply couple the input ...
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1answer
586 views

How to add a 32-bit input in Quartus 2

Can you help me to add a multiple pins input in Quartus 2? If there is not a default one, how can I add it by MegaWizard Plug-in Manager? Thanks!
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2answers
429 views

Protect Pycom Lopy from 12V input signal

I am in the process of building a water meter counter using a Pycom Lopy. The Lopy operates at 3.3v but my input sensor which is a metal detector (K1208065) uses 12V. Someone else has already build ...
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1answer
642 views

turn level-based input to edge-triggered input [duplicate]

I'm trying to figure out with the most minimal part count how to convert an input of a digital IC to an edge-triggered input. I am using the 82C55 IC and the input on it I want to make negative edge-...
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2answers
11k views

4 to 1 multi-bit multiplexer implementation [Q]

We are tasked with creating a 4 to 1 multiplexer with 4-bit inputs. I believe I fully understand how to create a 4 to 1 1-bit multiplexer, but I completely do not understand what the 'input' side and '...
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0answers
135 views

PIC18 port b interrupt on change is very sensitive

I am running a stepper motor with my PIC18F46K80 microcontroller. This microcontroller offer me the port b interrupt on change feature which basically generates an interrupt if the state the port b ...
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1answer
197 views

Amplifier IC - selecting input (Sound Card/Phone jack) and output(Headphones/RCA)

Good evening guys! I'm trying to figure out the solution to my problem, that I have encountered, but I just can't find anything close. So, first of all, the situation: I'm trying to build a 5.1 ...
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1answer
146 views

Arduino - Weird behavior reading speaker level input

I'm trying to detect when speaker starts playing audio, my speaker is connected with a 10uF 50v in series with the positive (red) cable coming out of my receiver, and negative to ground. Speaker (+) -...
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1answer
2k views

Bits are high on disabled pins(STM32)

For some reason I have many bits with value 1, even if they are supposed to be turned off. I tried to debug it with some LEDs and Keil uVision debugger. uC is STM32F103 The situation is: I have 2 pins ...
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1answer
724 views

How to connect input and output on Bistable Multivibrator

I built the circuit below on my breadboard. I've checked every connection and it doesn't work. The thing I didn't know how to do was connecting the output (a LED) and the input. (a button) I did ...
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2answers
948 views

Aux and Microphone to same input

I have a loudspeaker for my car and I've added an aux cord to the system so that I can play music over it. There is also a microphone attached to it and what I've done is add a 3 way switch between ...
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2answers
300 views

Using HDD as an input device for Arduino

I'm wondering if is it possible to use an old HDD as an input device that would feed some kind of data to Arduino. If you manually positioned the head and platter (the disk is not spinning, so it ...
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1answer
102 views

What does “LB” out mean in a DC-DC buck converter?

Teacher gave me a schematic,and it includes a DC/DC buck converter with "LB" input and output,but i have no idea what the "LB" is,so i want to ask that does someone know what may the "LB" be?
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2answers
268 views

Detect 230VAC or 12VDC in the same pin [closed]

I'm designing an input interface for a microcontroller (uC). Want to detect signals (only want to know if there is voltage or not) of different typology, so you can have in the same input to the board:...
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1answer
106 views

How to connect a headset as a microphone, and speakers at the same time with only one cable [closed]

So, I recently bought a headset from Tritton, named "Kama", as I got home I noticed a unusual problem... The audio input and output are in the same cable. I would really want to use this as both, but ...
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1answer
88 views

Input power vs charge curve (battery charging) [closed]

I want to know when charging a battery whether the charger reduces its current input as the battery reaches 80 percent charge, because it takes longer to charge the battery due to the charge curve. ...
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1answer
77 views

what is the minimum current sinking capability for pic

what is the minimum current sinking capability for pic16f18854? also i need to connect input switch to the pic.i have tried making my own and assuimg suitable data.please help me is this correct.need ...
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1answer
744 views

Voltage time graph integration

In a Voltage time graph , at constant current I= 170 amps, voltage=0 to 5,5 and time= 0 to 97 sec and voltage decreases from 5,5 at 0sec to 1,16 at 97 sec, now how can I find the total power ...
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1answer
366 views

Error: illegal Verilog output port specification

I am having problems with my verilog test bench. Every time I try to run it, I get the error in the title above for my four switch registers. I have searched this question numerous times but I cannot ...
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1answer
1k views

Input 5V 100mA, output 200mA

I am new to electronics. I have come across a problem which I face. Will need some advice from here, as I am a student and would like to know: is there any way I can increase current in a circle. ...
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1answer
580 views

Input Impedance of a diode connected MOSFET

I was trying to derive the small-signal input impedance of a diode-connected MOSFET (figure included), and came up with this expression. Is my method correct? I have been reading about methods of ...