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

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2answers
56 views

Input and UART error in PIC32

I have a PIC32 starter kit and I am making a program such that when I apply input 1, MCU will send this data to my PC using UART and ...
0
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2answers
65 views

Arduino digital input - Read voltage slightly higher then 5V - a power efficient solution [duplicate]

I need my Arduino to detect the state changes in a device - (ON or OFF). In order do do this, I have to check the voltage between two points on the PCB of the device. When the device is OFF, the ...
0
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1answer
61 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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0answers
29 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 ...
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0answers
18 views

HDMI Output to VGA Input [migrated]

I have a computer with only an HDMI output and a monitor with only a VGA input. I would like to have the computer extend its display onto the monitor. However, I have read that VGA outs cannot be ...
1
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1answer
43 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 ...
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3answers
109 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 ...
1
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1answer
327 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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0answers
37 views

Trouble Setting Up RF Link System

I'm trying to send a number from 1 to 4 over an rf link using 2 microcontrollers, but I keep getting some really weird "interference"? On the sending end, I press a button and it outputs a 5 ms ...
1
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2answers
350 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 ...
0
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1answer
40 views

Samsung Galaxy Microphone and Audio Recording Specs [closed]

I'm a documentary Filmmaker who's interested in exploiting the Audio recording capabilities of the Samsung Galaxy S6, S5, Note and Alpha on their own [Audio recording only] as well as in conjunction ...
1
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2answers
86 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 ...
0
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3answers
96 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
83 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
48 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
55 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 ...
1
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3answers
140 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 ...
0
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2answers
26 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
48 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
95 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 ...
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2answers
52 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
48 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 ...
0
votes
4answers
133 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. ...
0
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2answers
49 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 ...
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0answers
79 views

Compressor capacity vs input power, Kelvins law

Have got a silly confusion regarding efficiency calculation of AC & Ref. compressors. Here is a sample of specs of an Aspen miniature compressor. ...
0
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1answer
52 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, ...
1
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1answer
51 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 ...
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0answers
36 views

Square wave oscillator (up to 5kHz) from -40V to -10V (approximately)

I want to test a depletion mode TFT which has a turn on gate voltage of about -35V and consequently I want to show that this TFT can be used as an inverter and find the maximum frequency at which it ...
0
votes
1answer
148 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
votes
1answer
66 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 ...
0
votes
2answers
90 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? ...
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0answers
32 views

Explain to me how values are read with pullup resistors [duplicate]

In the above picutre, it seems to me as if when the switch is open, a voltage of VCC is on the input pin (i.e., voltage comes in through the resistor, to the input pin then back to GND through the ...
2
votes
2answers
80 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 ...
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1answer
83 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 ...
2
votes
4answers
144 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 ...
0
votes
2answers
105 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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0answers
69 views

Problem with Operating ATmega16 in Differential ADC mode

I have used ATmega16 in differential mode by configuring ADMUX as 01001111 for (Reference Voltage at AVCC and external capacitor at ARef, Left Adjustment, ADC3 as Positive Pin, ADC2 as Negative Pin, ...
1
vote
1answer
45 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 ...
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1answer
59 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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votes
1answer
54 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
58 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
votes
2answers
354 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 ...
0
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0answers
134 views

PSpice gives a crazy plot

I am simulating the following circuit The input voltage is a PWL voltage source that I configured to get a unit impulse input. From Matlab I know I am supposed to get this response But this is ...
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2answers
231 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 ...
0
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0answers
88 views

Input sensing level of STM32F0 microcontroller

I am trying to work with PS/2 protocol. It gives 5V as data '1'. Voltage level of stm32f0 is 3.3V. I am trying to take 5V from PS/2 protocol as input. But whenever I am trying that, it shows nothing. ...
3
votes
3answers
497 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
219 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
369 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
323 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 ...
0
votes
1answer
169 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 ...