Analog circuits have a range of voltages, rather than just two as in digital logic.
5
votes
2answers
126 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
99 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
42 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
0answers
35 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
55 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
132 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
71 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
89 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
72 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
98 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
3 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
27 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
7 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
81 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 ...
