Questions tagged [output]

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

37 questions with no upvoted or accepted answers
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88 views

Is a 90V output spike normal for a 45V buck boost converter?

The LT5176 buck boost converter outputs a short 90-91 volt spike at at the output in the 2nd second after startup, applying power to Vin. Schematic More details at Why does this buck boost with ...
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1answer
293 views

SMPS output noise: Why is it amplified further away from the output capacitor?

Well this is just a general question about switch mode power supplies, but i have recently built a buck converter, and read that it is very important where in the circuit you place your probes, to ...
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90 views

Increasing output current from ZVS driver

I bought the ZVS driver as shown in the picture below: After connecting a flyback transformer, I tried measuring the voltage and current at the output. The open circuit voltage is about 12KV. To ...
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1answer
275 views

PCM5102A: analog output level not what I expected?

I cannot achieve a 2.1 Vrms mentioned in their datasheet (pages 4 and 9). I can only output 1.04Vrms from the 1kHz source. Do I measure it wrong or this is what I should expect? Or maybe I get such ...
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1answer
448 views

Common audio signal voltage range on Line out connector

What is typical audio signal voltage range on Line out connector of consumer electronic devices? (Vmin/Vmax) I need specify Input voltage range to calculate op-amp. ...
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0answers
128 views

Is there any reason some pins don't not work as GPIO on ATmega?

I got an ATmega8515 and this simple code inside main(): void main(void) { DDRD = 0xFF; PORTD = 0xFF; while(1){} } I expect to see all the pins high, ...
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0answers
171 views

Power supply unit with two negative and positive outputs

So I am trying to add a power supply unit, which takes one input and supposed to provide one output: IN: 85-265V AC OUT:12V DC; 25A (max output power 300W) However, when I look at it, it clearly ...
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1answer
261 views

Combine 1 connector for in and output

To simplify the outside design as much as possible (keeping it simple to use and less expensive) I would like to use just one small 2-pin connector both as output to drive an external led and as 5V ...
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0answers
77 views

P-Ch high side switch output drop?

I am making a cutoff switch for a SLA battery using the this circuit V2 is the SLA battery, V5 is 0V or 5V coming from a some other logic circuitry. The simulation comes out fine. I understand that ...
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0answers
163 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 ...
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0answers
99 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
949 views

MOSFET - shorting the gate and source

I am currently in the fourth year of my bachelor's degree and my knowledge on this is really really really very limited, but i got a simulation circuit of an isolated dc-dc converter from my senior ...
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2answers
22 views

Output resistance of CE amplifier small signal model

I was studying input/output impedance of CE amplifier small signal model and I wanted to know why the output impedance (looking from the collector) is just Rc in parallel with dynamic output ...
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0answers
30 views

TPS54260 DC-DC Buck Regulator BOOT and PH pin voltage drop

I am using TPS54260 Buck converter which steps down 16V to 5V output. Load current is 600mA max. To the inrush current through the output inductor, I did some rework. But after some rework, my 5V ...
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62 views

Parallel Electrets - working BUT

I know this question is similar to the previous one, but it has a slight tweak. I have 4 electret capsules in parallel supplied by 5V (USB supply). They work fine (so I guess the current hasn't ...
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0answers
47 views

Common Collector Amplifier - Explanation?

I am new into electronics, and I dont get it how we find input and output impedance of Common-Collector Amplifier. I mean, I dont know what we are looking at when we are trying to find input and ...
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1answer
125 views

Circuit with two voltage dividers in parallel

I have the below circuit. I'm solving for Vx. Vx is just Vout for another voltage divider. So, the top left R is R1 the bottom is R2. Therefore shouldn't Vx be R/3R (Vs) = 1/3 Vs? But it's actually
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52 views

Analog sensor output incorrect when sensor not connected

I created a simple circuit to measure an analogue photo detector output that has 3 pins (vcc, gnd, output). I create a PCB by iron method to test it. But the problem is when the sensors are not ...
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0answers
52 views

Television output voltage at the headphone jack

The 3.5 mm headphone jack on an old tv is putting out 49 volts. This would seem too high. I am trying to fault find why my son received a shock from an amplifier body when he switched it on to play a ...
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36 views

capacitive displacement sensor calculation

while studying this certain types of problems with capacitive displacement sensors I came across one in particular that I am pretty much stuck. The whole problem is explained in following text and ...
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18 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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1answer
104 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
149 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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100 views

Power Supply - 2x output cables, joined at common rail

I have a 24V 25A power supply providing the juice to my 3D printer but it's a cheap LED driver and it's noisy - it's just the fan but as it's at home it's annoying. I'm looking to replace it with ...
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2answers
48 views

Load Cell Amplifier

I'm not from an electrical background and looking for possible options to amplify the load cell output. I'm using the following loadcell with a 2 mV/V output. http://www.sentranllc.com/pub/...
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61 views

Convert wet relay contact output to dry

I have a PCB which has output : GND and OUTPUT1. The contact is normally open, but when it closes it has voltage output of 4V and also closes the contact when checking on a multimeter. I want to ...
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0answers
41 views

Implementation of complementary filter and output of sensor while stationary

The code for a complementary filtered angle is not outputting the expected angle. I can get close to 90° using arctan formula from the accelerometer sensor data. Whereas, the complementary filter ...
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2answers
256 views

Electrical isolation in PLC output cards

Every output card spec sheet I read says something about electrical isolation. One I read recently said "Isolated 1500VDC channel to channel". What does isolation mean and what advantages do isolated ...
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0answers
43 views

Op Amp Output Current Requirements

Suppose I have a circuit like the one below. In simulation, at the point of maximum current draw, I measure the current through R1 to be ~-10mA, R18 to be ~28mA, R19 to be ~28mA, R3 to be ~-25mA, and ...
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1answer
53 views

Relay output issues

I am currently working on a project and to that end, i need to switch a 50VAC, 6-7 micro amp input across two outputs with a delay.I used a relay module connected to an arduino to do so. I intended ...
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151 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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2answers
310 views

DC-DC converter and trim resistor

I'm using this DC-DC converter +/-5V output version and I decided to use the trim up setting to get as close to 5.5V as possible. I determined the resistor value using this formula And got around 3....
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487 views

Can't get GPIOH pins to work as output on STM32F4 Discovery

I'm using 4 LEDs connected to different pins on STM32F4 Discovery: PA6, PD8, PH0, PD1. All of these pins have been configured as output with same function: ...
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1answer
422 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
459 views

Using LTSpice to find the gain of NPN-PMOS folded cascode

I am trying to use LTSpice to find the gain of NPN-PMOS folded cascode. Below is the question prompt: In the problem, the parameter specifications are as follows: \begin{equation} \beta =100,\:V_A=5V\...
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1answer
76 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
848 views

LM317 output voltage to 0 V with transformerless negative voltage created through a buck converter

I try to construct a shut down pin or a feature which can set the output of LM317 or LM78XX with negative voltage that is created through a transformerless buck converter. A buck converter having ...