Questions tagged [input]

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

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2
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1answer
169 views

Input output voltage problem in PIC32 starter kit & IO expansion board

I have a PIC32 Ethernet Starter kit and IO expansion board. I have a made a simple input output program in which if ...
1
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1answer
115 views

Is this a safe design for an input at a 74HCT165

I'm new to designing my own circuits so please be kind and tell me if I'm right with my thoughts or if I have errors in it. Thanks! The purpose of the 12V is to compensate the resistance of long ...
0
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3answers
179 views

What happens to voltage source if I take out both volt and current with separate circuit using diodes and then combine both separate circuits?

I have 3.8V and 1.2Ah battery. I will use a step up circuit that gives 5v and 200mA output using 2v in (from my battery). Then I will use blocking diode to take voltage only(5v) and I don't need ...
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1answer
536 views

How not to waste power with digital inputs?

I am trying to make simple gates with n-MOSFETS, yet I'm not sure how to actually do physical gate inputs correctly. At first, I tried this (a single-pole, single-throw switch from +5V to gate). ...
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2answers
992 views

Quick question about aux cable DIY

I've been planning to make an aux cable for my BMW 3-series, because the original costs 80€... So I've read a couple of DIY and I've found this So I've ordered the cable, capacitors, and the ...
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2answers
315 views

Input range of operation amplifier

Lets have a look at the following circuit: (Input waveform is sinusoidal and Vpp would be ~32V) The input waveform should represent an AC Source from a ...
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3answers
4k views

Digital Input Clamp Circuit Protection

To be able to connect some peripheral to digital input, I'm designing the circuit protection to avoid any possible failure due to over/under-voltage issue. So, I will add a clamp protection circuit. ...
1
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1answer
146 views

Comparing industrial vs. off-the-shelf analog input

Industrial controls are expensive and my company current spends a great deal of money installing them to monitor some rudimentary signals on equipment. For instance, we're trying to monitor: ...
0
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1answer
107 views

Input Pins having voltages (5V)

I am currently working on a microcontroller based system, the issue i am facing is that my inputs pins 40 and 39 of atmega32 are somehow getting internally high, Pin40 shows 2.5 volts and Pin39 shows ...
2
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2answers
329 views

Single input for consecutive state transitions in an FSM: preventing fall-through

Consider the following state diagram where the inputs are c and v. The system is also receiving a high frequency clock ...
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3answers
282 views

Computer peripherals to immediately (<5ms) detect digital input state change in C# programs

The C# application I'm working on needs to be able to be able to call a function within 5 milliseconds of a digital input signal's state change (0V = off, 5V = on). Rather than using software to ...
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3answers
297 views

Low leakage current methods of initializing pin inputs at power up

Suppose I have an IC that has a standard level triggered input pin. I need this pin's state to be setup immediately at power on at a time when my MCU's GPIOs may not have established levels. What are ...
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2answers
291 views

Oscilloscope input impedance when using a preamplifier

I am currently measuring the power consumption from a SoC. With the aim of reducing quantization noise due to the small amplitude of the signal (less than mV), I am connecting a R&S HZ-16 ...
0
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3answers
206 views

Simple Circuit Analysis, why this cap is needed?

This is a sub-circuit that is part of larger design and I was wondering why the designer choose to use C1 inline with the BJT base? and what does the combination of R1, C1,R2,R3 do? Since the max ...
0
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2answers
921 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 ...
1
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1answer
269 views

DC Op-Amp Output at an unexpected voltage?

For some reason Op-Amps are impossible for me. I'm experimenting with them a little bit. I have the following circuit... simulate this circuit – Schematic created using CircuitLab This is the ...
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4answers
499 views

Understading negative feedback [duplicate]

There is a question here about something similar, but it's asking about the internals of an op-amp. I'm having trouble understanding the function and use despite several hours of YouTube tutorials. ...
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2answers
526 views

Operational Transconductance Amplifier Input Configurations

I recently purchased several OTAs (Lm13700) but have had quite a bit of trouble using them. Going through the TI datasheet and a Nuts & Volts tutorial it's occured to me that transconductance amps ...
0
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1answer
196 views

“Differential Input Voltage” of “Fully Differential I/O Audio Amplifier” (OPA1632)

I want to use an OPA1632 as a symmetric signal receiver. The datasheet states: Supply Voltage, \$±V_{S}\$: ±16.5 V Input Voltage, \$V_{I}\$: \$±V_{S}\$ V Differential Input Voltage, \$V_{...
2
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1answer
115 views

Enable connected to unpowered regulator on another board

I have an ARM board which uses a VIO of 1.8V and requires that no i/o line be driven before it is fully powered up. It signals this readiness by asserting its "SYSEN" line. My design has SYSEN from ...
0
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1answer
647 views

PIC 18F PORTA pins as input

I am working on PIC18F4550. I have configured PORTA Pin0-Pin3 as inputs using following code PORTA=0X00; LATA=0X00; ADCON1=0x0F; CMCON = 0x07; TRISA =0XCF; and ...
0
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1answer
990 views

Relay driver circuit with input referenced to positive

I built a standard relay driver circuit as shown in the first schematic here: It works as expected, but I now realized my input is between the positive terminal instead of ground. How can I adjust ...
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2answers
224 views

TTL to CMOS Different Supply voltages

I am designing a circuit using a CD4011 Nand Gate 5 volt Vcc and a CD4555 using a 15 volt vcc. Will the Nand gate High output have enough voltage to drive the input of the CD4555 to a High Output? &...
2
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2answers
133 views

Temperature measurement into USB [closed]

I am trying to get a couple of temperatures into my computer. In my little lab I have about 50 thermistors that look a bit like this NTC-Thermistor. I now would like to get the temperature of all of ...
0
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1answer
973 views

How do I read my AC Adapter label. [duplicate]

My AC adapter reads... Output: +12V DC symbol 12.5A Input: 100-240V~ 50-60Hz 2.5A I would like some clarification on if i'm reading/understanding this correctly....
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4answers
4k views

Input and output resistance of an opamp circuit

Recently we have been working with opamps in the lab and I never can understand how to determin the output and input impedance of a circuit with op-amps (not the input and output inpedance of the ...
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2answers
426 views

Outputting 10V from 7 ports, low current

I'm working on a school project with a lighting unit that has seven inputs that read between 0-10VDC. I need some sort of microcontroller, relatively inexpensive, that can be programmed to output what ...
1
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1answer
102 views

Number of possible IOIO pulse inputs

Looking at this page it mentions that double precision digital pulse input (32-bit timer) can be divided into 2 single precision 16-bit timers. https://github.com/ytai/ioio/wiki/Pulse-Input It says ...
0
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1answer
75 views

tramsformer input output

I have one machine with transformer from 208 3 phase to 400 3 phase, what will happen if I connect the transformer to 360 V 3 phase as input is it will be okay or not? Because the machine comes from ...
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1answer
69 views

Selectively outputting 2 inputs based on a third input

I currently have 2 inputs that can be on or off, they could be 00, 01, 10, or 11. I want to output them only if a third input is active. I figured BJT transistors would do the job, but they seem ...
1
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1answer
176 views

Enable pin with maximum 3.0v

I've an Enable pin active-high that have maximum voltage rating of 3.0v, but I use a 3.3v MCU outputs. I've also a 3.0v voltage regulator on board. Should I use resistor voltage divider or there is a ...
5
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2answers
642 views

Is there a way to find the transfer function from only your input and the steady state response?

I know that a transfer function has the general form of $$ G(S) = Y(S)/U(S) $$ where \$Y(S)\$ is the output and \$U(S)\$ is the input. However, if given the output \$u(t)\$ and the steady state ...
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2answers
1k views

Pull up resistor on Schmitt trigger IC input?

I have two different circuits on two different boards. The output of board A, let's say, is optocoupler based and hence, it has a pull up on it. This signal is connected to board B through an ...
3
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3answers
3k views

Why do we need bulky filters at the input stage of SMPS designs?

I usually see costly and large filters at the input stage of switch mode power supplies. Isn't the AC signal already filtered by the large capacitor (the 100\$\mu\$F one in this example) after the ...
3
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2answers
1k views

Verilog data input

Hello I am relatively new to verilog and need help on part of a project am working on. I need someone to guide me as to how you read data from an analog device. I bought an analog temperature sensor ...
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4answers
5k views

Can an opto-isolated input be analog?

Title says it all: can an opto-isolated input be analog or are they intrinsically digital? Why: I am looking to purchase a relay control board and am deciding between a few options. Here is my ...
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3answers
1k views

What are the mechanisms at work in a pull-up or pull-down resistor circuits with a push-buttons and a GPIO?

I have a question regarding the GPIO (from a Arduino board for example). How does it work exactly when you use it as an input pin? What are the mechanisms at work when you use it in a pull-up and pull-...
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1answer
1k views

24 volt on microprocessor input pin

I have got my hands on a Intel Edison system on chip. I would like to use it to detect non-zero voltage. For example I have a test point that could be either 0 volt or 24 volt and I want to detect ...
2
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1answer
678 views

Transfer function of a real opamp circuit

I know how to calculate the transfer function of an ideal opamp. But when calculating for a real opamp, should I use the Input Bias Current values specified in the ...
2
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1answer
2k views

Differences between MIPI-CSI1 and MIPI-CSI2

I'm trying to find what makes a difference between MIPI-CSI1 and MIPI-CSI2. From what I understand on this specifications document, they both work the same way, except that MIPI-CSI2 offers up to ...
4
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3answers
545 views

ESD protection for pH measurement electrode input

I want to puild a pH meter, which uses a normal glass electrode. Such an electrode behaves as a pH dependend voltage source (<+-500mV) with very high internal resistance (10MOhm - 1GOhm, depending ...
1
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1answer
996 views

When setting pin as input it getts pulled high, why?

I've hooked up a push button to GP1 and a LED to GP2 on my PIC12F683 and this is my code: ...
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2answers
155 views

How does one implement the following function with these tools provided?

Suppose I have a function defined as follows, such that it is expressed in POS form, with the product of the following max terms of 4 variables (A,B,C,D): 0,3,4,7,9,10,12,15 and I only have a 4 to 1 ...
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1answer
983 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. ...
1
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1answer
148 views

Input protection with MAX366 exhibits very slow falling edge. Why?

I'm using the following circuitry to protect my microcontroller input pin from the dangers of the bad and ugly outside world (a trigger signal coming from an unknown source). The signal comes in from ...
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2answers
740 views

Phototelectric smoke sensor with microcontroller

I am trying to connect a photoelectric smoke sensor with Atmega328. The smoke sensor IC has pin 7 as the I/O pin which gives a 9V when smoke is detected. I have connected this pin to the input pin of ...
0
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1answer
367 views

Understanding the input specifications for a laptop adapter [closed]

The sticker on my laptop adapter claims the input should be INPUT: 100-240V~ 2.5A(2,5A) 50-60Hz What does all this mean? Here are a couple specific questions: Can the adapter accept anywhere ...
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0answers
276 views

Should my external analog input be isolated?

I want to build a device that samples analog signals from various measurement instruments via their analog outputs. The instruments have their own power supply, and all devices are powered from the ...
2
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1answer
2k views

What is the use of dual differential amplifiers in audio applications?

Why do audio amplifiers use dual differential pairs sometimes? Is there a mathematical justification and not just "the joy of symmetry"? Any hints, especially with some math would be of great help. ...
3
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3answers
6k views

What kind of metal are the legs of resistors made from?

Can anyone tell me what kind of metal is used in electronics to make wires going in/out to the elements? Can longer of this metal wire be found anywhere? Actually I am looking for sth like copper wire ...