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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Speaker level to line level

I want to reduce my amplifier output to line-level. I found this tutorial, Connecting speaker signals to line level inputs, which is compatible with 50 W output power. There is also mentioned ...
LiskoSlayer63's user avatar
4 votes
2 answers
254 views

Handling audio (from mic to headphones)

Right, I'm new to electronics, but this is what want to know: What do I need to take a mic input, and output it to some ear phones (standard jack, can be mono). I want to build a motorcycle intercom, ...
Ben Everard's user avatar
4 votes
1 answer
764 views

Netduino to power 12V LED Strip

I'm a programmer by nature, but I thought I'd try dabbling in programming a micro controller. I've hooked up my voltage meter, and have figured out how to switch my output ports on/off, and they're ...
Chase Florell's user avatar
4 votes
2 answers
136 views

Operational amplifier using power supply current as output [closed]

I have come across a circuit (I am not allowed to share it) with an opamp that uses a special output. The opamp's output is loaded with a resistor and has no other connection. It is the current drawn ...
Hyp's user avatar
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How do I calculate sound pressure level (dB SPL) from headphones at a specific setting on my sound card?

I am using headphones with sensitivity 102 dB SPL / 1 Vrms with impedance of 300 ohms. For a particular volume knob setting on my sound card embedded with a headphone pre-amplifier, I would like to ...
Tanmayee Pathre's user avatar
4 votes
1 answer
387 views

PIC pins change state when DC motor connected

I'm new to PIC programming, and having trouble getting getting it control a DC motor. It's a PIC18F25K22, and a TI L293D driver. Power is suppliued by a 5V linear regulator connected to a desktop ...
Trenton Holmes's user avatar
4 votes
2 answers
4k views

Is pinch off voltage of JFET constant?

The drain current is related to gate to source voltage by the following equation: \$I_d = I_{dss} (1 - \frac{V_{gs}}{V_p})^2\$ Now, with changing \$V_{gs}\$, I think \$V_p\$ also changes. I am ...
Victor Mukherjee's user avatar
4 votes
1 answer
422 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 ...
Linkyyy's user avatar
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1 answer
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What is causing the digital output of my MEMS pressure sensor to decrement continuously?

I'm a lowly mechanical engineer so bear with me. This problem has been the bane of my existence. I'm using a temperature-compensated barometric pressure sensor in a fluid-contacting application. ...
mere engineer's user avatar
4 votes
0 answers
310 views

LDO Outputs wrong voltage

I am working with a very low profile LDO, TCR5RG18A and I'm having issues at the regulators output. It's outputting 0.9V which is half its nominated value (nominal value = 1.8V) The LDO is operated at ...
ZagElectroBat's user avatar
3 votes
2 answers
643 views

Darlington transistor configuration

Can two 2n2222a transistors output more than 1amp of current if biased properly; supposing 1.4v to 1.5v is applied to the base?
imran muhd's user avatar
3 votes
4 answers
799 views

Is an op-amp's output current limited by the supply (+/- Vsupply)?

As above. I'm looking at the OPA548. The max. output current is 3 A, but reading the datasheet, I'm unsure if that's from the +/- Vin or the +/- Vsupply.
mrjayviper's user avatar
3 votes
1 answer
948 views

Headphone output - what is the function of these resistors going to ground between the decoupling capacitors and headphones

The Korg Monotron Duo synth uses the TPA6111A2 headphone amp. The circuit they use is largely the same as the one from the datasheet - except for R78, the 470ohm resistor going to ground right after ...
Kenny Winker's user avatar
3 votes
2 answers
236 views

MAX608 boost converter stopped working, the OUT pin is shorted to ground

I was working on a little project to convert 3.7V from a lithium ion cell to 5V using a MAX608 boost convertor IC. I put the required components according to page 7 of the data sheet and everything ...
ilgaar's user avatar
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2 answers
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Best way to linearly step-up MCU output 0-3.3V to 0-5V

I am about to move from Arduino to my own MCU platform and am currently looking at the likes of the ARM Cortex M7 and M0+. One of my worries is that these microcontrollers seem to be only capable of ...
Eliott W's user avatar
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2 answers
386 views

Inverting opamp amplifier

The gain of an ideal opamp is considered infinite and Vout=K(V+ - V-). where V+ is the non-inverting input and V- is the inverting input. The output voltage in the case of an inverting opamp amplifier ...
Sakshi Dwivedi's user avatar
3 votes
3 answers
4k 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 ...
Jamie Lamb's user avatar
3 votes
2 answers
10k views

difference between dry contact mode output and open collector output

We have a device which can work with dry contact input and a device which gives open collector output. Will it inter-operate? Is there any difference between dry contact mode output and open ...
SunnyShah's user avatar
  • 141
3 votes
5 answers
589 views

LM358 output problem

I have a problem when using LM358 in compare mode. I'm trying supply LM358 with 5V (V+ = 5V, V- = GND). The non-inverting input is 0.6V and the inverting input is 0V and 1.2V, respectively. When the ...
Nhat Micls's user avatar
3 votes
2 answers
1k views

Building a midi project with Arduino + scrap components (optocoupler and diode)

Original title: 300V output Optocoupler in a 5V circuit I'm (new to this) trying to build a midi controller (in and out) with arduino and scrap. I guess I had several questions in one so I changed ...
mikmikmik's user avatar
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2 answers
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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....
T555's user avatar
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3 votes
2 answers
11k views

Why should the output impedance of a current source be much greater than the input impedance of the load?

For a voltage source (except RF circuits), the output impedance of the source signal being coupled must be much smaller than the input impedance of the load. This is first of all done to prevent ...
user16307's user avatar
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3 answers
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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 ...
thexeno's user avatar
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3 votes
1 answer
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OP Amp controlling a Power Mosfet

let me say that I have a 40 Years+ experience in digital electronics (I worked for Sperry Univac) but my knowledge of basic analog electronics is almost zero, so I beg you pardon for may possibly ...
Resca's user avatar
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3 votes
4 answers
8k 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 ...
gorilon's user avatar
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2 answers
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If a clock edge matches with data output edge what should SPI read?

I have an analog to digital converter that reads in and sends data out on falling edges. I also have two MCU's the FEZ Hydra and the FEZ Cobra. I've noticed using the oscilloscope that the data into ...
user1084113's user avatar
3 votes
1 answer
110 views

500 mV p-p noise in two stage photodiode amplifier output

I have problem with power supply noise finding its way to op-amp output. Power line (+ and -) noise is 40 mV p-p. Is this due to poor pcb layout or poor filtering and what to do to make it better. I ...
Jesse Haataja's user avatar
3 votes
3 answers
488 views

How to prevent short circuit between output pins

I am trying to hack some signals coming from an old computer going to a Floppy drive using an ATtiny1614 microcontroller. Normally the computer has full control of the signal lines but at some window ...
durandal's user avatar
3 votes
1 answer
1k views

Using an LM358 as line level buffer

Recently, I've acquired an old SNES, specifically the SNSM-CPU-1CHIP-03 model, with no audio output. I traced the issue to a dead S-Mix chip, essentially a buffer between the audio DAC and the line ...
Areku's user avatar
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3 votes
2 answers
507 views

Video generation with Shift Register

Im building a homebrew 8 bit computer and having some problems with video output. I want to know if its possible to generate high resolution, say 640x480, monochrome video output, PAL or NTSC, using ...
h0m3's user avatar
  • 85
3 votes
2 answers
2k 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 ...
MrUser's user avatar
  • 259
3 votes
2 answers
2k views

How does a NOT gate bypass the output?

I have found the basic tutorials on gates and the way they work. However, I'm not understanding conceptually how a NOT gate, when activated, bypasses the output. Circuit as follows: simulate this ...
Robbers85's user avatar
3 votes
1 answer
272 views

Using LED driver as PWM digital outputs

I'm building a robotics project where I need to control a lot of DC motors. I picked the DRV8870DDAR H-bridge motor driver chip which needs 2 PWM input signals to control the speed and direction. ...
csiz's user avatar
  • 174
3 votes
1 answer
2k views

Analog and Digital Output protection?

I know it's important to protect analog and digital inputs. My question is should you also protect outputs, both analog and digital? For the inputs, right now I'm using clamping diodes, an MOV, a ...
Pugz's user avatar
  • 831
3 votes
2 answers
3k views

Solenoid stays on when output turned off

I have a power supply with 12V running into a the common on my PLC. Output 0 on the PLC is wired into a solenoid. The negative on the solenoid runs into the ground on the power supply completing the ...
Ben B's user avatar
  • 41
3 votes
1 answer
139 views

How to determine voltage level of the ultrasonic transducer?

I am designing the generator for an ultrasonic transducer for a cleaning system and I am not sure how to set the output voltage level. I measured the voltage level of the existing products, peak ...
hax's user avatar
  • 33
3 votes
2 answers
83 views

Could this circuit cause the MCU to fail?

I drive a common-cathode three digit 7-segment display (JSD-2832AUR) with an MCU (TM4C123GH6PGE). The circuit looks as follows: Distribution of the signals on the MCU ports: All ...
Velvet's user avatar
  • 4,299
3 votes
1 answer
891 views

Output resistance of an amplifier

While studying amplifiers, I came across the AC equivalent circuit of an amplifier: To calculate the output resistance of the amplifier, the input signal was set to zero and the load resistance was ...
Essar's user avatar
  • 31
3 votes
1 answer
442 views

555 timer that does not output low when reset

I'm trying to design a circuit with the following goals: When not active, output can be either Vcc or floating When triggered by pressing a button, output pulses several times to GND at some ...
Ryan's user avatar
  • 33
3 votes
2 answers
4k views

Output resistance of MOSFET circuit

I am trying to find the output resistance \$Rout\$ of this circuit consisting of 3 n-type MOSFETs. It is given that all 3 MOSFETs have \$g_m=4 mA/V^2\$ and output resistance \$R_o=100k\Omega\$. ...
Lachlan's user avatar
  • 83
3 votes
1 answer
913 views

Output of a D flipflop upon power up?

I guess the output state of a D-flipflop is unknown upon power up. But what are the chances that it is neither 0 nor 1 but an intermediate state such as VDD/2? The D-flipflop in this question has an ...
Niranjan Kulkarni's user avatar
3 votes
2 answers
2k views

FFT + filtering sound = triggering signal

I'm trying to FFT the live input sound and filter it to have only 350 to 500 HZ. So, my goal is to turn the LED light on only when some sound has frequency between 350-500. I looked at FFT codes, but ...
Bri's user avatar
  • 31
3 votes
3 answers
3k views

arduino thermal anemometer

I've been trying to use my arduino as a thermal anemometer based on the excellent and tiny IST FS5 "thermal mass flow sensor" - there is more information and a datasheet here - http://uk.farnell.com/...
user avatar
3 votes
2 answers
821 views

Is the dynamic resistance ignored in this output impedance formula?

Does the following tutorial neglect the dynamic resistance across the base and the emitter in derivation of the output resistance:? It assumes Vbe constant and ignores the dynamic resistance? But ...
user1245's user avatar
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3 votes
2 answers
2k views

Wiring 2 audio output transfomer secondaries in series or parallel

I want to know if wiring 2 audio output secondaries in series is doable. See problems with this schem? Would parallel be a viable alternative?
The XO's user avatar
  • 31
2 votes
3 answers
325 views

Flash ADC's nonlinear output and response

I don't understand this paragraph about flash ADC. A flash converter can produce a non-linear output which is an additional advantage. The voltage divider network consists of equal-value resistors ...
bb0667's user avatar
  • 115
2 votes
4 answers
7k views

Opamp output to source and to sink

The output impedance of an ideal opamp is zero. The output of an ideal opamp acts as an ideal voltage source. The output of the opamp should be able to output very large currents (to source) and (to ...
Roshan Timsina's user avatar
2 votes
3 answers
1k views

Updating Multiple Ports on 8bit AVR in Single Cycle

On the 8bit Atmel AVR MCUS (specifically mega and xmega series), is it possible to simultaneously modify multiple ports in a single instruction cycle? For example, I have a 512kB RAM chip which ...
user3081739's user avatar
2 votes
1 answer
2k views

JK flip flop random start outputs

I am working on a project for college and I have to implement a sort of alarm using only MUX's and JK flip flops and a bread board. The problem I encountered is that whenever I power the whole circuit ...
Xzenon's user avatar
  • 153
2 votes
1 answer
6k views

Transformer - If the Output V number matches, does it matter that the A numbers are different"

The transformer that came with my Kinkle Fire say "DC Output: 5V1.8A". I want to install some Fastmac Usockets in my house but their specs say "Output: 5VDC 2.4A". Do the different A numbers matter? ...
Shirley's user avatar
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