Questions tagged [output]

A signal or power being generated by one system for consumption by another, or a connection for that purpose.

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116 views

Altera FPGA Pinout help [closed]

I recently bought an Altera FPGA Cyclone II board off of ebay, it says BAIXUN on the LCD display. It didnt come with any documentation. I'm trying to program the FPGA board but I have no idea what pin ...
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1answer
95 views

Why can some products take 110v 60hz and also 240v 50hz? [closed]

Most modern chargers can go into any output across the world. I believe this is because of low powered "Switch mode" technology it uses rather than transformers, like they used to. To go from high AC ...
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1answer
851 views

How to Shift the DC Level of Positive-going Op Amp Input Signal into the Negative Supply Region

I have a 1Vpp 1Hz repetitive arbitrary wave signal that resides entirely above the DC line. IOW there is no negative-going excursion. This is output from an LM358 inverting op amp buffer powered ...
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2answers
558 views

Can I play sound from USB, Not from sound card?

I made an FM radio transmitter circuit and it works. It is supplied using a 12 volts transformer. The input of the transmitter is connected to the output of my PC's sound card (just like the way we ...
1
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1answer
68 views

Accidentally outputting to an optoisolator

It's your friendly electronic hobbyist again. I am designing a board where I am reading input from an optoisolator like this. IN7 is connected to a peripheral parallel port chip of an old 8-bit ...
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2answers
920 views

Can I replace watch quartz with DS3231 32 kHz output?

I'd like to know if it's possible to synchronize classical quartz clock by replacing inbuilt quartz crystal with DS3231's 32 kHz output. I need to synchronize my analog watch with RTC DS3231. Am I ...
2
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1answer
4k views

Latched outputs on 8255A

I am studying about the 8255A PPI. In Mode 0 of it, it says that the outputs are latched and inputs are not latched. What exactly does it mean?
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0answers
162 views

continuous DC voltage across output pin of an IC (DAC output)

I would like to ask you one question. Actually in the automotive there is chance of 20v or 5v continues output come across output of my IC (PGA400)i.e output of DAC. I would like to know in general ...
3
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2answers
372 views

Simple LM386 Circuit RC Branch Question

Please take a moment to checkout at the LM386 circuit below. The circuit comes directly from the LM386 specifications document: My question revolves around the output branch consisting of the 0.05 ...
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2answers
56 views

USB controllable digital output ports at >100kHz [closed]

I need to control 8 digital output pins over a USB connection at a minimum of 100kHz. What solutions exists that allows me to do that? Preferable a COTS module if possible. I am thinking something ...
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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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3answers
5k views

Correct Way to Limit Op Amp Output Current

I'm planning to use an AD817 op amp in the output stage of my function generator (datasheet). I'm worried about how the part would stand up to a short, so I ran some simulations. The simulation below ...
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1answer
697 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 ...
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 ...
0
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1answer
986 views

How can a speaker have a higher output power than input

Looking around the internet, there haven't been many answers to this questtion. Here is one which doesn't fully explain it: Power input smaller than output? How can this be? So I am confused. I know ...
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1answer
4k views

Programmatically turn on PIR device with Arduino

I have a D203S PIR sensor operated device. I want to simulate motion detection with my Arduino and then let the device operate as normal. I have seen that shorting the PIR sensor for a couple of ...
3
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2answers
1k views

Simple function generator: is current-limiting/short circuit protection/impedance matching necessary?

I have designed a function generator with the intent to provide test signals to a microcontroller or ADC of some other device. However, I may forget that a year down the line and plug it into some ...
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
65 views

Question about output current

I've got huge three-phase transformer, primaries are connected in Y configuration, secondaries in Delta, then goes to 6 diode bridge rectifier. Output is about 200 amp 52 VDC. In short, how many ohm ...
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2answers
213 views

Deactivating NE555P with a latch

I wish to use a two gate latch to control a 555 timer.The goal is to turn off the output by shutting down the IC.Will this happen if I disconnect the positive supply or the ground so there will be no ...
0
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2answers
857 views

Arduino - Controlling 8 RGB LEDs (beginner question)

First time poster here. I have an Arduino Uno project that will require 8 RGB LEDs to be controlled. They will be turned on and off with pushbuttons, cycling through red, then green, then blue, then ...
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1answer
49 views

Current limit on data out pins of Microchip HV5623

I am working on a project that uses the Microchip HV5623K7-G Serial-to-Parallel converter. As part of the design process I need to determine what would happen if the board I am designing is plugged in ...
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2answers
673 views

555 Timer Min Max Expected Output Voltage Value

Could someone please tell me what are the min and max output values that should be expected from a 555 timer Output (pin 3) given X volts as the voltage source? For example, assuming that the 555 ...
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2answers
1k views

Why do we short the input when calculating the output impedance?

I believe the title says everything about the question. My issue has to to do with the following: Consider a two-port given by: $$V_1 = Z_{11}I_1 + Z_{12}I_2$$ $$V_2 = Z_{21}I_1 + Z_{22}I_2$$ Cleary ...
4
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2answers
6k views

What does pulldown resistor from Arduino's output pin to ground do? Is it necessary?

I came across the first picture below. But I am not able to find out how such arrangement is necessary or beneficial when you want to switch a load with an N channel MOSFET? Question number 1: Is ...
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1answer
254 views

Why the led is blinking instead of keeping on atmega8

I wrote a very simple sample code into my atmega8 via avrstudio here it is: ...
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1answer
266 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
495 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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1answer
872 views

can i use a 20V, 2.0A for my laptop that needs 19V, 4.74 A? [closed]

i have a laptop that needs 19V and 4.74A my laptop's charger broke and i replaced it with a 20V and 2.0 A the laptop seems fine but i noticed that the charging goes on and off for like an interval or ...
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2answers
928 views

Low frequency low voltage Sine wave generator

I want to build a low frequency (around 10 Hz) and low voltage (about 3V) sine wave generator to drive an electro magnet. It would be very helpful, if you can suggest few efficient ways of doing this.
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1answer
174 views

Boost Converter High output impedance

at no load my boost converter, will be the same as in the photo. I'm thinking without a load at the end of the boost circuit the output impedance will be very high which will make the potential ...
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1answer
1k views

tri-state / high-z / high impedance output with gpio input

The Li-ion charger I'm using (MCP73831/2) has a tri-state status output. The datasheet says that the STAT pin outputs High-Z when inactive or complete, and Low while charging is active. Whats the ...
3
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1answer
8k views

What is drive strength a measurement of?

In microcontrollers and the like that have programmable drive strengths for GPIOs, said drive strengths are defined in mA. For example you might have a choice of 2mA, 4mA, 6mA, 8mA, etc. My assumption,...
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0answers
97 views

arduino output pins collapsing voltage - is it dead?

After a while i came back to my arduino UNO R3, and attempted most simple program, that sets digital output pin high. I measured voltage over that pin, and got 5 volts, but when I connected an LED, ...
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1answer
2k views

Measuring Output Amps From a Power Supply

I am in the quest to build a cheap bench power supply, i have successfully designed, built and tested the entire voltage circuitry. The device includes a graphic LCD screen that displays the voltage ...
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1answer
956 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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1answer
1k views

Non-inverting op-amp output problem

I have built very basic non-inverting op amp circuit and for some reason it outputs just 4V DC line instead of amplified sine wave. It happens only on breadboard, simulation works ok. I'm pretty sure ...
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1answer
166 views

10V DC Linear power supply

Currently I am using an Allen Bradley Analog output card to get a variable -10VDC to +10VDC output as defined by the PLC program. However the PLC will only supply 100ma with that voltage. The device ...
0
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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 ...
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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 ...
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2answers
128 views

When a datasheet specifies output current is it per pin or aggregated for all pins?

When a datasheet specifies something like output current, as with the 74FCT244 or for example, is this referring to the aggregated output current between all pins or the capacity of a single pin ? ...
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3answers
1k views

Get an output (like a voltage or dry contact closure) from any/most typical digital alarm clocks?

New to the community and less than a hobbyist so please advise if this question should go elsewhere. I am not noting a particular alarm clock or model because I would like this to be repeatable ...
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1answer
3k views

Fuse blown indicator circuits compilation

I have been working in a compilation of circuits to use that basically show to the user that a fuse has blown up, this is particulary useful in the bench, needless to say I haven’t tested all of them ...
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1answer
79 views

Confusion with output wiring and signal conditioning

I’m little confused about wiring and signal conditioning the following instrument: http://www.skypowerinternational.com/uploads/documents/4.3351.x0.140-161_WG-Geber-firstclass-advanced_analog_eng.pdf ...
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3answers
3k views

Do I really need the open loop output impedance of an op amp?

There are several answers on the internet and here on how to calculate the output impedance of the opamp with a given feedback. My intention, though, is to find this value with an open loop ...
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2answers
160 views

OUTPUT Impedance

I wish to find the output impedance of the circuit in the attachment. I have drawn the AC Equivalent of the circuit but I don't know how to come out with the Formula for the Output Impedance. I would ...
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3answers
13k views

How to read a push-pull output

I recently came across a sensor that had a "push-pull" output. I can't find anywhere how to read such an output: Is it some particular kind of analog output? I would want to read it with the ...
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1answer
1k views

using AD620 with load cell

I am currently using an AD620 to amplify the signal coming from my load cell. I am supplying it with single supply of 5V and 0V. Below is my preliminary circuit. I am feeding half the supply to the ...