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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100 views

No output from AOZ3103DI buck converter

I built the typical application in the datasheet but after powering up the circuit I got no output and the IC is getting hot with in seconds even it is only consuming 60 mA, I am running the circuit ...
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2answers
71 views

Lack of data when performing hand calculations

This question refers to BJTs, FETs, MOSFETs, etc. When I am designing a one or more staged BJT transistor circuit I am often considering differential base-emitter resistance aka "rπ" and finite ...
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3answers
3k views

Inverter Output Filters

I am designing a H bridge converter which is supplied with a 400VDC bus. The switching frequency will be 20kHz I want fit an LC filter to the output so that a sinusoidal voltage is produced, the ...
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2answers
1k views

Diode - output waveform of a network

Question: Determine the output waveform for the network(assume that all diodes are ideal) The book says for the positive half-cycle it will be like this: Similarly I think that for the negative ...
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2answers
378 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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1answer
208 views

AVR timer output when Data Direction Register set to input

This question refers specifically to an ATmega328P, but probably can be generalized to most or all AVR MCUs. Known 1: When the Data Direction Register (DDR) for a pin is set as input mode, it is ...
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2answers
2k views

Matching sensor output with PLC input

I am trying to add a height captor for a line of my production where I work. I found this Banner captor (QS30LLPQ) and it has 2 bipolar discrete outputs (PNP and NPN). Now, I am trying to decide which ...
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2answers
897 views

How does an output switching from HI or LO to HI-Z affect an input in CMOS?

Let's say we have a tri-state buffer output connected to an inverter input, implemented in 7400 series CMOS chips. If the buffer output is HI, the inverter output is LO. If the buffer output is LO, ...
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1answer
110 views

Where does my negative input voltage come from? [closed]

I'm a bit confused about the concept of an input ground for an op Amp. Let's say I'm amplifying the output from a 555 timer ic. I assume the output pin from the 555 is my positive input but what is a ...
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1answer
58 views

How to find out a register contains inputs or outputs or both?

I don't have much experience with embedded systems and I am trying to check if is possible to determine if a register is made of inputs or outputs or a mix of inputs and outputs. Let's say I have a ...
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1answer
40 views

Connecting 2 ventilators to the same output? [duplicate]

So i have an output of 5V 1A, and i want to connect 2, 5V 0.15A ventilators to the same output, and the question is - will there be enough voltage for both of them(because i have 1A output, and both ...
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1answer
318 views

Does a rotated polarity diagram have a special meaning on a netbook adapter? [closed]

I saw some other questions about replacing charger X with charger Y, so it's probably not offtopic here. This is my original adapter: This is the adapter that looks promising to be a replacement: ...
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1answer
341 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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5answers
783 views

Regulating LED brightness using headphone output

My PCs headphone jack (green) outputs a 4Vpp (2V amplitude) sinusoidal signal at 100% output level set in the sound preferences. What kind of circuit would I need to drive a red LED (2.2V forward ...
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2answers
1k 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 ...
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3answers
1k views

How to differ output & input resistance of small-signal model BJT?

I understand how input and output resistance of small-signal model for bipolar transistor is defined and how draw one. What I don't understand quite yet is how actually input and output resistance of ...
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1answer
2k views

Spartan 6 bidirectional pins how to use

Is it possible to use pins of Spartan-6 bidirectional. (switch between input/output) The following is the situation: I have a high speed ADC and DAC, but this do not have to opperate at the same time....
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2answers
692 views

Opamp wrong output gain

I have a circuit like this: I am using OP07CP op-amp . V+ and V- are supplied by two 12.2V adapters (which are quite stable!) V1 are supplied using Function Generator According to what I have ...
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2answers
2k views

Common drain JFET output resistance “problem”

The output resistance of small signal model for common drain JFET amplifier equals $$ \frac{1}{g_\text{m}} || R_{\text{ds(on)}} \parallel R_\text{S} $$ and since $$ R_{\text{ds(on)}} =\frac{1}{g_\text{...
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4answers
249 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
5k views

Confusion with output impedance of non-inverting and inverting opamp circuit

I'm trying to understand why the output impedance of non-inverting and inverting opamp circuit is almost zero. I found the following text on the derivation: β is the closed loop gain above. But I ...
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2answers
10k views

How much voltage does a green LED need to be supplied? Will it handle 5V?

I’m supplying 9v through a 5v regulator. This regulator powers five IC quad gates. This is all for a 4 bit ripple carry adder. With that aside, could I just power the LEDs (which will visualize the ...
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1answer
362 views

I/O Voltage of JFET Common Source with source degeneration

For common source JFET (n-channel): Uin = Ugs (approximation for simplicity), but really Uin is a little bit lower because of input resistance, like so and Uout equals something like this: But how ...
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1answer
216 views

Is it possible move mouse cursors via IR pins?

In a mouse (with ball) there are IR sensors and phototransistor sensors (in pairs) to check the movement of the mouse in both axes. For each axis, there is the following configuration: http://...
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3answers
1k views

MOSFET Common Source Output Analysis

What is the difference between those two circuits, when only output node is changed? Is there any changes in the output resistance, voltage gain, or somewhere else? simulate this circuit – ...
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1answer
11k views

I/O Resistance of common source MOSFET with source degeneration

Common Source MOSFET with source degenerations looks like this I am a bit confused about different input and output resistance statements (provided by different sources). Some of them say that ...
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2answers
46 views

Avoid shocking with he help of isolation transformer [closed]

Is it possible to touch the output of islation tramsformer with out getting shocked ?
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1answer
151 views

Why is output equal to non inverting input opamplifier

I wanted to make a simple current source. The circuit was build so that the laser would get a constant current. I bought the opamplifier opa552 from china for 1 euro because it could handle large ...
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4answers
7k views

Purpose and explanation of resistor near output of LM317, high-current, adjustable-regulator circuit

I'm trying to make a high-current, adjustable-voltage regulator using LM317 data sheets. Specifically, I am using the schematic below. So, what is the point of the resistor related to Note A? Is it ...
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1answer
861 views

How to measure the output level of the sub out of an A/V receiver

I want to measure the output level of the RCA subwoofer output jack of an A/V receiver. How do I do that? Should I use the DC Volt mode of my multimeter and stick the positive prove into the hole of ...
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1answer
673 views

Fuzzy 3.3V from MC34063

Recently I've made simple buck regulator based on MC34063 from TI. I want to use that to power my SMT32 base application. Voltage on input varies from 9-26V. I've put some part on general purpose ...
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1answer
547 views

Impedance of BNC vs output impedance of function generator

I'm a bit confused on output impedance of function generator and coaxial cable impedance. Consider a function generator with output impedance of \$50 \Omega\$. Suppose that I connect to it a BNC \$...
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2answers
914 views

cmos push-pull configuration

Why here http://www.talkingelectronics.com/projects/MOSFET/MOSFET.html they say that push-pull configuration with high-side transistor as PMOS and lowside as NMOS is incorrect? I have found many ...
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3answers
348 views

Why triple output in every 230v -> low voltage DC power supply? [closed]

Why do all 12v power supplies produce triple output? All power supplies that I see at Amazon www.amazon.com/s/ref=nb_sb_noss?url=search-alias%3Daps&field-keywords=12v%20power%20supply%2030a or ...
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1answer
286 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
583 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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3answers
9k views

What is the minimum input voltage to turn on the Transistor?

Attached is the snapshot of the circuit I am working with. My aim is to find the minimum input voltage to turn on the transistor (T) With the following assumption, voltage drop across the resistor ...
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3answers
557 views

Flyback output voltage

I'm having trouble with a flyback converter I got. My output voltages are not what they are supposed to be. Flyback schematics is below: If you cannot see very clearly, primary number of turns is 200 ...
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2answers
167 views

Misunderstanding of output impedance and linearity

When I read about Thevenin equivalent, it is mentioned it only applies to "linear circuits". But I also see in texts and tutorials showing how to measure the output impedance of an actual device ...
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1answer
140 views

Problems with deriving output resistance without using a model

I was reading different texts about input and output resistance of the above circuit and trying to understand the Rin and Rout without using any transistor models such as pi-model or T-model. I think ...
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1answer
457 views

How much will the output voltage of a transformer drop as I add loads?

I have a transformer that says 6V 600mA 3.6VA, AC current (but the voltage measured is actually 8.65Vac). I will add a 4 diode rectifier WITHOUT capacitor (I say without in order to simplify the ...
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3answers
94 views

Will the IC mess up if the inputs that don't affect the output are disconnected?

Here's the situation. I'm trying to incorporate ANY decoder in the HC family to decode two bits. I'm also using the eagle autorouter. I decided to go with 74HC139 since its a dual decoder and the pin ...
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1answer
543 views

opt 101P photodiode for light communication [closed]

The following is the circuit for Light communication using opt 101P photodiode. Connections are COM pin (pin 8), and pin 3(-V) are grounded. Input volatge(pin 1) Vcc = 9 V . OPT 101 has a photodiode ...
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1answer
5k views

How to control the output voltage for the different types of the dc generator?

Generally DC generators are classified according to the ways of excitation of their fields. There are three methods of excitation. Field coils excited by permanent magnets – Permanent magnet DC ...
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3answers
984 views

Fight inrush current with PTC, good go or not?

To power an amplifier, I use a lipo battery 3.7v (4000mah) or two 18650 batteries 3.7v (4000mah) in parallel with a DC/DC boost converter that boost the voltage to 24.2 volts. The circuit performs ...
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2answers
531 views

What kind of output is on this PID Controller

I have a Altec PC410 PID controller with 2 outputs purchased from eBay. However the exact model number is not known. On top of the controller is a diagram showing how the 2 ouputs are different. Is ...
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2answers
612 views

Zero on non-inverting input for non-inverting amplifier gives output different than zero

I have downloaded spice models for LM358 and LM318 from TI website. Can somebody please explain me the difference between outputs on both amplifiers. I know that there should be some input offset ...
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1answer
248 views

Opto Isolator 150 V Square Wave Output

I am trying to design a circuit that enables me to use low voltages to control an actuator that works with high voltage. I think I need to use an opto-isolator. How can I get a 150V square wave ...
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1answer
617 views

What's the name of this output connector of ac adaptor

What's the name of this output connector of ac adaptor : Thank you for your help
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2answers
743 views

Original 555 timer transistor output implementation

I am a beginner casual electronics hobbyist trying to learn about how chips work internally. In order to accomplish, this I went out and got a 555 timer soldering kit and started experimenting with it....

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