Analog circuits have a range of voltages, rather than just two as in digital logic.
1
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0answers
28 views
Analysis of Shunt Circuit
I am having trouble computing the closed loop gain of the circuit below:
It seems clear that this configuration is a Shunt Voltage but I just can't figure a way of computing the feedback factor and ...
2
votes
2answers
123 views
Most efficient way to read analog signals in c++
I am new to AVR programming, and I am trying to learn the basic I/O with C++.
I am trying to find the simplest, most efficient way to read analog signals using the same function for different ...
1
vote
1answer
74 views
Reason for certain steps in Circuit Analysis
The image is from this lecture.The instructor Prof. Shanthi Pavan says that the part encircled in orange can be replaced by a voltage source with current through \$v_1\$ as \$i_1\$ and not \$i_1 + ...
0
votes
0answers
26 views
over temperature and current limiting question about a power switch: BTS5235
I am designing a cuircuit with BTS5235-a smart power switch from infineon.this is the datasheet of BTS5235
I get realy confused about its datasheet.
1.problem about VDS(Voltage at power transistor). ...
4
votes
2answers
116 views
subtract two AC voltages with instrumentation amps
I'm implementing the so-called "3 omega technique", where a thin metal line is excited with a sine current. The metal has a high TCR which causes a 3rd harmonic oscillation, and I need to measure the ...
1
vote
1answer
41 views
what is the effect of a current-carrying wire through a solenoid?
The solenoid coil concentrates the magnetic field lines through the interior when the solenoid wire carries a current.
I am curious about a different case, however. If a (separate) straight wire went ...
2
votes
2answers
133 views
Expanding Range Of Analog Values From Temperature Sensor
I'm trying to build a temperature controlled relay module with an ATtiny45 ( Arduino UNO R3 as ISP ) and a NXP KTY81-222 Temperature Sensor.
The temperature range i want to monitor is 20°C to 30°C.
...
1
vote
2answers
99 views
Transfer Function Of Multiple Feedback Filter
Can someone please give me tips on how I could prove that the transfer function of the multiple feedback filter below is
\$
T(s) = \dfrac{ -\dfrac{1}{R_1 R_2 C_1 C_2 } } {s^2 + s\dfrac{1}{C_1} ...
3
votes
1answer
77 views
Solving for RC circuit transfer function
How do I calculate the transfer function of this circuit? \$H(s) = \dfrac{V_o}{V_i}\$
I apply the Kirchhoff's law at the node \$V_x\$ but I still have \$V_x\$ as unknown :
\$\dfrac{V_x - ...
2
votes
1answer
76 views
Reversing a .5-4.5V analog sensor output to 5V-0V
I have a pulse width modulation (PWM) control board that uses a 0-5V input via a potentiometer to control a DC motor speed. As I understand how this works, the potentiometer goes from 0% PWM at 0V to ...
7
votes
2answers
163 views
How to analyze this diode circuit?
I am trying to analyze this simple diode circuit by hand, but I can't seem to get too far.
simulate this circuit – Schematic created using CircuitLab
Using circuit lab, it is evident ...
1
vote
1answer
138 views
Reading the frequency of an AC signal using an arduino
Basically I have a motor with a magnet spinning on the end. I have a sensor that produces an AC signal when the spinning magnet is placed next to it. It produces a voltage of ±300mV. I want to measure ...
1
vote
1answer
43 views
Derivation of filter tables
Could someone please point me in the right direction for finding derivations showing how normalised filter table values come about? What should I be searching for to find the derivations?
I've ...
0
votes
1answer
52 views
PIC32 Issue with using JTAG Pins as Analog Inputs
I'm trying to read in a value using a few analog pins on a PIC32 (MX775F512H), including RB12-- part of the JTAG pins on the device. The device the board is reading from works great, but the board ...
0
votes
2answers
67 views
What is the basic principle for a cmos vcc detector circuit?
Most systems that have any controller/firmware need to know when to start powering up. I would imagine this might need a powerup circuit or a detector that trips when we are at an acceptable voltage. ...
2
votes
3answers
143 views
How do I calculate the input voltage based on an ADC reading?
+UB is a 12V power supply. I have to find the voltage on U_KL30.
I take this U_KL30 as an input at PortA<1> of my MC9S08DZ60 and use an ADC to get a ...
4
votes
2answers
96 views
Understanding the operation of a soil moisture measurement circuit
I have a circuit that measures soil moisture but I am not able to understand how it works. Should we use copper plates or probes in the circuit? Is the circuit measuring the capacitance or resistance ...
4
votes
3answers
105 views
Under what conditions should we use negative voltage? [duplicate]
As mentioned in the title I'm curious and confused under what circumstances a negative voltage should be used? Does it mean in a negative voltage power supply the current is flowing from ground point ...
-1
votes
1answer
79 views
what type of electronics job would combine mathematics, electronic design and programming into one [closed]
There are quite a few different areas of jobs in the Electronics industry.
We have Analogue, Digital, Embedded, Telecommunications, Control and much more. What I wish to know is that what job would ...
3
votes
4answers
99 views
ADC resolution selection
I want to convert analog output of an accelerometer to digital codes.
I understand that the sampling rate of the ADC should be with reference to Nyquist criteria.
Please let me know how to decide ...
2
votes
2answers
45 views
Input impedance of Arduino Uno analog pins?
I'm using the ACS712 hall-effect based current sensing chip on some small robotic arm motors, and reading in the analog voltage with an Arduino Uno. I've had reasonably good results, but only after ...
4
votes
1answer
51 views
analogRead(0) or analogRead(A0)
The arduino reference states that you would use the following code to read the value from analog pin #5:
int val1 = analogRead(5);
However to read from digital ...
4
votes
1answer
34 views
Efficient way to get multiple analogue voltages out of an Arduino?
I've read in my research that most microcontrollers are not built with DAC outputs as they are expensive to include on silicon chips. Also applications that require analogue outputs typically need a ...
1
vote
2answers
93 views
Virtual ground circuit won't work as expected
I need a split rail circuit for a 741 op amp.
The circuit can be found here:
or here (the latter can be simulated).
I have simulated the circuit in three different programs an it always seems to ...
0
votes
0answers
22 views
Single supply op amp for a twin-T oscillator? [duplicate]
I'm trying to build a twin-T oscillator for synthesising drum sounds. The LM741 heats up pretty quickly and the circuit hardly oscillates even when the feedback is at 100 per cent. Even with an LM386 ...
3
votes
1answer
223 views
Single power supply replacement for LM741 op amp?
I'm trying to build a twin-T oscillator for synthesising drum sounds. The LM741 heats up pretty quickly and the circuit hardly oscillates even when the feedback is at 100 per cent. Even with an LM386 ...
1
vote
1answer
97 views
Output Resistance Voltage Controlled current source
I am having problems evaluating the output impedance (\$R_{out}\$) of a voltage controlled volage source, the notes I am using say the output impedance is
$$ R_{out} = \frac{r_o}{1 +AK} $$
but I ...
10
votes
4answers
85 views
Can I use the analog pins on the Arduino for my project as digital?
I am new to using Arduino, and I have an Arduino Uno. For the projects I've done, I've only used the digital pins.
I am building a small vehicle that uses stepper motors. I have run out of pins to ...
3
votes
4answers
342 views
What is the use of analog circuits today?
While studying analog circuits and conducting experiments with op-amps, I couldn't help wondering why would I need an analog circuit to add/multiply/integrate electrical signals. In modern times, ...
13
votes
2answers
21 views
How do I extend the number of analog (input) pins available to me?
I already know how to extend the number of digital pins on an Arduino using a multiplexer.
I want to increase the number of analog input channels that I have. One solution is to add another Arduino ...
0
votes
1answer
40 views
What is the analog pin for on a Phidget 3051 Dual relay board?
I recently purchased a Phidget 3051_1 Dual Relay board with the intention of using it to switch on and off flourescent lamp ballasts (20W tubes) over a fish tank by connecting the relays to 110VAC and ...
0
votes
1answer
107 views
Active low pass filter giving constant output regardless of input
I have a sensor that gives me an output between 1 and 4V, and I wanted to filter out noise present on the output to give me a more stable and accurate reading.
I set up an active 2nd-order ...
3
votes
1answer
49 views
Effect of switching noise on a handheld measurement device
I'm planning to make a handheld LCR meter (plus more) based on Cypress's PSoC 5LP chips. One of their many features is a built in boost converter, which seems an attractive prospect, since it would ...
0
votes
2answers
54 views
Common Mode Differential Analog Input
I'm using the LTC5598 IC for modulation. I am confused as to how to properly feed my BaseBand analog signal into the chip.
According to its datasheet:
The circuit is optimized for a common mode ...
1
vote
1answer
51 views
ADC PCF8591 - change range for measuring
I'm doing my first project on my Raspberry pi with analogue signals, using the PCF8591 ADC.
I managed very easily to measure 0 - 5 V with the chip, connecting the Reference Voltage (VREF, pin 14) ...
1
vote
5answers
154 views
Oscillator circuits operation?
Damped AC oscillations are produced in LC circuit by charging and discharging of capacitor and inductor but how it is achieved through an RC circuit as RC circuit is used in Colpitts Oscillator?
1
vote
1answer
71 views
Turning the PN junction of JFET on?
I am going to use a N channel JFET as a normally-ON switch. I am wondering if it would cause any problem in the long term reliability having the PN junction forward-biased. In other words, would it be ...
4
votes
3answers
100 views
How should I search up parts for basic hard-wired computer? (really basic, no, more basic than that)
I'm looking to build a computer the size that I can use small jumper cables for the programming, no soldering. Of course it won't be able to do much more than binary counting, etc.
What kind of parts ...
0
votes
3answers
175 views
Input impedance is higher in Common-Emitter than Common-Base?
Why is input impedance is higher in Common-Emitter configuration as compared to Common-Base configuration as signal is applied on Base-Emitter junction in both Amplifiers. Not in both configurations ...
2
votes
1answer
83 views
Depletion region in JFET transistor?
In this diagram of JFET transistor the depletion region is narrower at one end and wider at other end. Why is that so? Is it due to the voltages applied at gate and drain?
1
vote
1answer
94 views
Fet is named field effect transistor,why?
Fet is named field effect transistor transistor while field effect is also producing in bjt. What are the factors/reasons that Fet is called field effect while bjt is not? I have read textbook but it ...
-2
votes
1answer
132 views
Easiest Way to Split Audio [closed]
I'm looking for the easiest way to split audio, and I couldn't find a splitter ic. I'm using an msgeq7 that combines the two channels, and I like to have a splitter before its combined so that I can ...
4
votes
4answers
336 views
Why JFET is called voltage controlled device while BJT is called current controlled device?
My question is why JFET/FET is called voltage controlled device while BJT is called current controlled as both required voltage to operate properly.In both electric field is produced so why is the ...
1
vote
1answer
56 views
TCA9555 Analog I/O
I understand that the TCA955 is an I/O extender that communicates via a I2C bus. What I can't figure out is whether this chip will take analog inputs as well as digital inputs. I'm trying to add more ...
0
votes
2answers
119 views
Electron flow due to impedance?
In the basic electronics lecture today not only I but whole class became confused by an explanation of our teacher that in high impedance value electrons movement become easier while in low impedance ...
1
vote
2answers
161 views
transfer function of active filters
I've been looking for some straightforward method or trick to obtain the transfer functions of active filters (like the Sallen-Key filter , the butterworth or Cauer topology etc...) since KCL or KVL ...
2
votes
4answers
159 views
analog circuit to convert one resistance to another
I plan to have a thermistor attached to a CPU heatsink control the speed of a computer case fan.
For temperatures below 30c (room temp) I want to stop the fan, and for temperatures at or above 60c, I ...
0
votes
2answers
50 views
Best Option for converting & processing multiple analog data lines
I am looking for a good Microcontroller (or DSP or other device if they are more applicable) option that has a reasonably large amount of analog input data lines (preferably > 10 analog input lines) ...
5
votes
1answer
106 views
How can I lower output impedance of an accelerometer?
I'm planning to use an accelerometer with a microcontroller to measure acceleration. The issue that I have ran across is that in PIC microncontrollers the ADC requires that the connected analog ...
8
votes
4answers
174 views
Flow of holes in transistor?
Bipolar transistor are said to have both electron and holes flow. Movement of electrons can be understood but holes are fixed part of the atomic/crystal structure.How can we characterize their ...
