Questions tagged [analog]
Analog circuits have a range of voltages, rather than just two as in digital logic.
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2answers
37 views
How to send a digital signal when analog sensor (QRE1113) reaches a threshold value without resorting to wasting analog input pin?
I'm building a miniature pinball machine and I am attempting to use an infrared reflector sensor (QRE1113) to detect when the ball rolls over it (I got the original idea from Ben Heck's videos).
In ...
1
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2answers
76 views
Circuit To Measure Phase difference
Is there any classical analog circuit to measure the phase difference between two analog signals ( especially sinusoidal signals )?
I want to measure the phase difference between two sinusoid signals ...
1
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3answers
86 views
Simple Non-Inverting Op-Amp Problem
I am trying to double the voltage out from a 1.5V battery using an MCP618 op-amp as a learning experience prior to using the op-amp to amplify the output from a set of strain gauges set up in a ...
-3
votes
1answer
87 views
How to reduce frequency of output signal? [on hold]
I am making a new circuit for energy harvester.
The output power is about 100V and 100Hz signal.
I want to get the 5V(or 3V) and 10Hz, with a minimum number of circuit components.
Because the ...
0
votes
3answers
58 views
Tektronix function generator THD
I am confused by the datasheet of the AFG3021C: https://www.tek.com/link-click-count?nid=75006&url=https%3A//download.tek.com/datasheet/AFG3000C-Arbitrary-Function-Generator-Datasheet-75W282817....
0
votes
1answer
27 views
IR circuits: increasing sensitivity of simple analog receiver IR LED
I have the following circuit using a TSOP1738 and a simple IR receiver LED (analog):
It's basically:
a TSOP1738 put to my 5V uC pin, its OUT being read directly by the yellow channel of my ...
1
vote
2answers
43 views
Sallen-Key - how opamp input bias current changes cutoff frequency?
As in the title: what exactly is the impact of input bias current in Sallen-Key topology, for example the one below:
I read that it can matter significantly, however I did not find anything more on ...
0
votes
1answer
28 views
Wires coming out of a pigtail cable
There's a audio 3.5mm to pigtail cable on sell at Adafruit:
https://www.adafruit.com/product/1700
It looks like what I need as I could connect one side to an old phone, play some music and the loose ...
0
votes
2answers
35 views
VL input on analog switch
I'm going to use a DG403 analog switch, supplied with +/-15V, to switch an audio signal below that range.
datasheet
The logic signal would be 0V/5V, so I need 5V on the VL pin of the switch. The ...
0
votes
1answer
21 views
Analog Sensor output signal accuracy and sensitivity
I have to decide between 2 load cell models. the only difference between the two is that the output on one is 2mV/V and the other is 3mV/V. Both are rated at 2.5klbs.
Which one of them would be more ...
-1
votes
1answer
175 views
Logic Circuit Completely Failing (Cue Lights System)
I have been working on a circuit the details of which are below. Today I finally got round to finishing and testing it. Guess what! It failed... I don't know if this is the place for this but would ...
1
vote
1answer
29 views
VCVS in LTSpice Operating as a Comparator
I am using a VCVS in LTSPICE.
I am confused about the command in the Spiceline for using a Table.
I want to use the VCVS as a 1 bit Comparator instead of making a transistor based one.
What will ...
-2
votes
2answers
42 views
A precision industrial measurement system uses a transducer that produces an output analogue signal of 5V peak, [closed]
A precision industrial measurement system uses a transducer that produces an output analogue signal of 5V peak, which is bandlimited at 2.5 kHz. The signal is digitized with an accuracy of +-0.0025% ...
1
vote
4answers
140 views
Op-Amp gain calculation
I'm trying to find R4 that will make:
$$\frac{V_{out}}{V_{in}}=-120$$
The operational amplifier is ideal.
My attempt: In the '-' input there is a virtual ground, so the equivalent resistor above is ...
0
votes
1answer
33 views
Voltage Circuit Switch with BJT
I have Found One Circuit Which acts as Switch to Pass 15NV (15 Negative Voltage) to Opamps Negative (-VCC) Supply But I am unable to understand its working . Why Two NPN are used in this Circuit ? ...
0
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2answers
37 views
Measuring maximum output current of Operational Amplifier
I just designed a two stage miller compensated operational amplifier, I am not sure how to measure it's maximum output current, Can you give me a precise definition of this current?
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0answers
58 views
Can you generate a pure sine wave by mixing a fixed frequency sine wave with a variable frequency square wave?
Let us suppose I don't have a DDS available, and instead I have two square wave clocks with frequencies of my choosing. I have the impression that creating a wide bandwidth (multi-decade) sine wave ...
3
votes
1answer
36 views
Phase shift near saturation mitigation in input stage amplifier — How does this work, why does this work?
I'm trying to understand how this circuit works on the input stage to the 4192A Impedance Analyzer.
Apologies for the quality... this is the best scan I could find. The design is furnished with the ...
0
votes
0answers
26 views
Measure the 'gain' of this circuit
I made this schematic using Ni multisim and I got asked to find the ‘gain of this circuit using a 1v p-p 1kHz sine signal’ and I was unsure about this because I’m not sure if it means voltage gain or ...
0
votes
1answer
39 views
CT measuring circuit with PIC
I am using external CT to measure Current parameter. I am using PIC16F1938 to measure analog . Now here i am looking for circuit and calculation involved to get proper current rating
datasheet
Min ...
0
votes
2answers
54 views
Use ADC as Analog Comparator (AttinyAVR)?
I have recently been trying to transition from Atmel's Atmega 328p avr to the newer (and much smaller) attiny416. The trouble is, the 416 only allows you to choose between two positive inputs and two ...
-1
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1answer
81 views
Any cheap and easy ways to isolate analog signals?
I want to isolate some transducer signals. Everything I've looked up is pretty expense/requires a lot of supporting circuitry which, because of volume, is not ideal. What is the easiest/cheapest way ...
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2answers
77 views
Figure of merit of Operational amplifier
How can I measure FOM(figure of merit) of an operational amplifier? There are so many parameters, how can I decide which formula to use while calculating FOM?
1
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1answer
73 views
Considering analog meters as displays, which would be more versatile - voltmeters or ammeters?
Note: I'm here to see if there's an objective reason to choose one type over the other.
I've got some projects in mind that would use a microcontroller to drive one or more analog meters as displays, ...
0
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0answers
64 views
PCB Grounding Plane Review
I am reviewing a 6 layer board that has analog signals on the left and right side of the board.
I have always read that analog circuitry should be grouped together for easy plane segmentation. ...
0
votes
1answer
25 views
LTSpice transient analysis and current amplification problem
Im simulating LC circuit in LTSpice:
It's tuned at resonance at 1 MHz in the transient response simulation plotting the source and R1 current. Both of which are equal in amplitude 600mA but with a ...
0
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0answers
47 views
Differential Amplifier Exam Problem
I am lost with how to approach part C and D of the question. In fact, I need some intuition with how to tune a differential amplifier.
2
votes
1answer
681 views
What is the purpose of op-amp in the output of Instrumentation amplifier
I encountered a problem while solving an analog circuit.
I just need to know the purpose of the last op-amp (K4) at this circuit:
while solving I understand it just amplify the output voltage from ...
0
votes
1answer
18 views
Analog Devices Filter Wizard Schematic Question
I am using filter wizard to help me design an active multiple feedback bandpass filter. I understand the parts of the schematic that show the stages of the filter, like this:
However, I am ...
2
votes
4answers
501 views
Photodiode almost no mV at analog port
So I have bought a photodiode, which I intend to hook up to the analog port of my Arduino, so that I can measure differences in the light that the photodiode picks up.
I realized, that when I don't ...
0
votes
1answer
106 views
FM Transmitter Circuit (range 3 km) on Multisim
I am new to the telecom simulations system specially multisim, which I am having a project that I want to simulate.
My project in (Analog Communications) is consisting to have FM Transmitter (...
2
votes
1answer
62 views
Coupling coefficient variation in Wireless power transfer
Question regarding WPT compensation topologies.
I'm trying to make a inductive wireless power transfer system where the RX coil can move quite conisderably relative to TX coil and still transfer ...
0
votes
4answers
107 views
Opamp with multiple feedback loops
I have been trying to figure out how the following circuit works and what it might be good for without any luck so far.
What might the transfer function be?
Is there a way that analysis can be ...
11
votes
6answers
2k views
Why do we get only one frequency as output in oscillators?
I am just into oscillators where I learned \$AB=1\$ for sustaining oscillations in positive feedback. Since \$A\$ and \$B\$ are both frequency-dependent, \$AB=1\$ is true only for a particular ...
2
votes
1answer
46 views
Analog ground/Digital ground question
I am designing a four layer PCB, (signal, ground, pwr, signal), which is to generate +-1V max 30kHz frequency signals which is output on a differential pair.
It is pretty simple board layout but I am ...
1
vote
0answers
23 views
Operation of Swing-Type Voltage Controlled Amplifier
I'm trying to understand this Swing-Type Voltage Controlled Amplifier which is found in the classic Roland TR-808 drum machine.
What I understand currently is that the input signal to the base of the ...
0
votes
2answers
73 views
Analysing circuit for digital filter design
I have a hard time understanding how one would come up with \$H(j\omega )\$
given a circuit for an unknown filter.
The circuit looks like this:
I know that: \$H(j\omega ) = \frac{Y(j\omega )}{X(j\...
-1
votes
0answers
21 views
Digital SPST 74HC4066 and Reed Relays
I'm reaching out today to ask for help regarding SPST switches as compared to Reed Relays.
To control a series of signal lines that come from a sensor (from which I unfortunately do not have much ...
0
votes
1answer
47 views
Crystal Oscillator Power
In the following circuit:
taken from: https://circuitdigest.com/tutorial/quartz-crystal-oscillator
How is the crystal powered to begin oscillation?
I understand the amplifier is required to prevent ...
0
votes
1answer
42 views
Electronicaly switching parallel LC circuit components
Let's say I have mentioned circuit and I want to be able enable/disable one of the 1uF capacitors to change the frequency of the LC circuit.
I would like to do this electronically with a micro-...
0
votes
1answer
47 views
How can I make a voice transmitter receiver? [closed]
How can make a system which have two circuit. And one is place at ground floor and another is in roof. We send voice (like call) one from other by pushing a switch and vice versa. It may be wired ...
0
votes
1answer
33 views
Mixed equipment grounding
I have built an analog circuit PCB that I want to debug.
It has to get a bipolar power +-5V and an input sinus signal. The signal on the CUT (circuit under test), has buffered inputs (but a common ...
-1
votes
0answers
50 views
Low power analog timer circuit
How can I achieve the following:
When a switch closes momentarily
Hold a mosfet switch closed for about 15s.
Then gradually reduce power to zero over about 4s
Using little-to-no power when not ...
0
votes
2answers
61 views
Why is bipolar EMG better than monopolar at reducing (common mode) noises?
As defined in this post, the monopolar EMG can reduce the common mode noise by taking the difference of the two inputs, i.e. EMG_mono = k * (V1 - V2).
And, for bipolar mode,EMG_bi = k3 * [k1 * (V1 - ...
1
vote
0answers
18 views
Common Source with Active Load
I'm trying to design this circuit using gm/Id method.
I am already able to achieve the desired GBWP and Gain (this is just a simple example so I'm just trying to achieve both) but I'm having trouble ...
0
votes
1answer
80 views
Adding multiple differential signal
As I asked in "Adding multiple analog signal" before, I got that: for adding some signal together, we can only use op-amp, instead of lovely integrated circuit (ough).
But the question arise because ...
0
votes
2answers
64 views
Adding multiple analog signal
I'm trying to add 4 output of ADA8282 together and create only one analog signal with bandwidth about 6 MHz, I know Op-Amp adder as "How can I add three AC signals?" and "ElectronicTutorial" said. ...
1
vote
1answer
153 views
Arduino - Using NPN transistor as a switch to pull-up/down analog pin
Let me start by saying that I am not an EE, and my knowledge in Electronics is basic, so please bear with me and be patient if, initially I am bending a few rules.
In Epee fencing, a touch is awarded ...
1
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0answers
26 views
Sampling DC and AC components of capacitive sensor
I'm using a MEMS capacitive pressure sensor SCB10H. As I understand it, I can wire it up in one of two ways. Either I can measure the absolute capacitance using a chip like the TI FDC1004. In this ...
1
vote
1answer
79 views
Floating analog input using Arduino with 1m cable
I use an analog input from an Arduino to read the value from a piezo plugged in parallel with a 1M ohm resistor.
I followed this tutorial from Arduino: https://www.arduino.cc/en/Tutorial/Knock
Here ...
