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

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2
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1answer
50 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: ...
1
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1answer
39 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
117 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. ...
-3
votes
1answer
51 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 ...
0
votes
2answers
47 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. ...
0
votes
1answer
31 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 ...
0
votes
1answer
47 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 ...
1
vote
1answer
85 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 ...
0
votes
1answer
117 views

Ghosts? Speakers playing sound from Raspberry Pi 2 without being connected [closed]

Yesterday I discovered something really strange: my speakers were influenced by my Raspberry Pi without having the headphone jack plugged in. Well okay, that does not sound very special, since they're ...
1
vote
0answers
42 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, ...
-1
votes
1answer
124 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 ...
0
votes
1answer
63 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
106 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
1answer
88 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 ...
0
votes
1answer
50 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
votes
2answers
85 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 ...
0
votes
1answer
56 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 ...
0
votes
1answer
43 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 ...
0
votes
2answers
49 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 ? ...
0
votes
3answers
133 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 ...
1
vote
1answer
149 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 ...
0
votes
1answer
41 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 ...
1
vote
3answers
269 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 ...
0
votes
2answers
92 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 ...
2
votes
3answers
530 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 ...
0
votes
1answer
159 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 ...
2
votes
1answer
363 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 ...
5
votes
2answers
321 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
votes
3answers
50 views

SN74HC138 demultiplexer. How do I implement a switch?

I have this demultiplexer and I need to configure it in such a way that I can control 8 transistors using its outputs. They NEED to be NPN transistors, so when I select an output using the addresses, ...
0
votes
0answers
39 views

How to obtain a 50 hz 240 Vac from a 3 phase PMG unstable frequency supply?

I have read about using a rectifier, buck/boost then a inverter at the end to achieve my goal. But is there any easier way to do this? I may fix my generator rpm, but it may result in low frequency. I ...
1
vote
2answers
229 views

How to tristate output digital pin on a pic 16 series microcontroller?

I know that I can set digital output pins as high and low like this in c: OUTPUT_PIN = 1; OUTPUT_PIN = 0; Is there any way to set that said pin as tristate or ...
2
votes
1answer
176 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 ...
1
vote
1answer
139 views

How to calculate theoretically Output Impedance of a Linear Voltage Regulator

I am trying to calculate the output impedance of the following circuit, a linear voltage regulator. What is confusing me is the feedback coming from R1 and R2. I used R4= 500 ohms, R3 = 1K , R1= 25k ...
1
vote
3answers
111 views

Calculated output is greater than the op amp can produce?

I had to analyze a differentiator and integrator op amp. I am now asked the question of what would happen if the calculated output is greater than the op amp can produce? I am given a hint that it is ...
0
votes
1answer
48 views

Output Pin of Burleigh PZ-150 Amplifier Driver Analog High-Voltage Power Supply Unit

I have found a Burleigh PZ-150F Analog Amplifier Driver. However I could not locate the manual. What connector cables are compatible with the output port of this amplifier? It seems there are two male ...
2
votes
1answer
118 views

Transfer function of a real opamp circuit

I know how to calculate the transfer function of an ideal opamp. But when calculating for a real opamp, should I use the Input Bias Current values specified in the ...
0
votes
2answers
138 views

Convert perpetual magnet motor output to 5 volt DC

Disclaimer: Hi, I was in the neighborhood (StackOverFlow) and just noticed this cool site. I have had this general wondering for a while now and I am not sure if my question is constructive enough for ...
0
votes
0answers
77 views

1 Mbps satellite channel with a 270 ms delay

Consider 500 byte frames sends on a satellite channel with a 270 ms delay on send an receive by 1 Mbps rate. by ignore the length of ACK message and using Slide Window technique, how many bits need ...
0
votes
0answers
55 views

Linear time invariant system transfer function is known - calculate output signal

Here is my task: a) Calculate and sketch amplitude spectrum of u(t), b) u(t) is input signal for linear time invariant system whose transfer function H(jw) is shown. Calculate output signal uo(t) ...
1
vote
3answers
140 views

Recognising output impedance of an amplifier though inspection

The output impedance of FET amplifiers seem to be a hit and miss affair when I try to find it just through inspection. For example, sometimes it's easy to predict, whereas some other times I have to ...
-1
votes
1answer
107 views

Input 5V 100mA, output 200mA

I am new to electronics. I have come across a problem which I face. Will need some advice from here, as I am a student and would like to know: is there any way I can increase current in a circle. ...
2
votes
1answer
265 views

Calculating the Output Resistance of a Widlar Current Source

I'm currently struggling to understand the small signal equivalent used in the following calculation: http://en.wikipedia.org/wiki/Widlar_current_source#Output_impedance My problem is: How come they ...
1
vote
1answer
63 views

Output impedance of a differential line receiver

Let's say I have an INA134 (http://www.ti.com/product/ina134) from Texas Instruments in my design. I want to take the output of that IC and feed it into a resistor network which can have a flexible ...
1
vote
0answers
71 views

Arbitrary difference between the output of multiple op-amps

We recently created a circuit where we were testing the voltage drops in a mesh network of resistors. We wanted to be able to apply arbitrary voltages between different nodes in the mesh network. ...
0
votes
2answers
71 views

Comparator Output Swing Measurement

i wan't to measure the maximum and minimum output swing of a Comparator. I'm using the circuit which you can find attached. However, since the Output of the Comparator (TI LM2903) is open drain, I ...
2
votes
4answers
560 views

Why do they usually make comparators open collector?

I never see open collector opamps while I frequently see open collector comparators. What is reason for preferring open collector output in comparators? (Inside of LM193.)
0
votes
0answers
55 views

Crystal Oscillator output voltages and power

I have built the crystal oscillator stage to the Pixie 2, a Hartley oscillator, with a 9 volt voltage source. I measured the output with my VOM set to AC 30 volts. It read almost 30 volts. That is ...
0
votes
2answers
889 views

Maximum op-amp output current

Im looking to drive an LED, but am not sure if i should use an op-amp or bjt configured as a switch. Is it possible for an op-amp to source roughly 10mA; the current needed to drive an LED in series ...
4
votes
2answers
154 views

Understanding resistors on inputs/outputs of op amps

I was looking at the schematic for Dave Jones' uCurrent, and I can't seem to make sense of why there are 270 ohm resistors on the inputs and outputs of the op amps in his circuit. The resistance is ...
2
votes
1answer
198 views

Differential pair output to voltage amplifier transistor

When designing an amplifier stage, like this, how does it work in a linear fashion? Suppose you're applying some feedback, the output may well be stabilized to zero, but the more "wrong" \$R_C\$ is ...