Questions tagged [signal]
A signal is a stream of information in the form of a varying quantity. Usually in electronics, signals can be in the form of voltages, currents, or radiated electromagnetic fields.
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How can the diode conduct in negative half cycle of AC signal in clamper circuit?
Could you kindly help me understand the clamper circuit. I watched a couple videos and I'm confused. My confusion is in positive clamper circuit. How can the diode conduct during the negative half ...
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Why do direct conversion receivers amplify only after mixing?
The vast majority of the simple direct conversion receivers I've seen amplify only after mixing. The RF is filtered before mixing, but not amplified at all. For example (from Solid State Design for ...
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Capacitor in series with a button
I'm working on making my old Lift Master / Craftsman / Chamberlain garage door opener 'smart'. The original control panel uses two wires at 22 volts to control 3 functions - door toggle, light toggle, ...
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Controls - seeing if a discrete time system can arrive from a certain input to a certain output
Given a system:
$$A = \begin{pmatrix} 7 & -3 \\ 18 & -8 \end{pmatrix} \quad B = \begin{pmatrix} -2 \\-6\end{pmatrix} \quad C = \begin{pmatrix}1 & 0 \end{pmatrix} \quad D =0$$
I need to see ...
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'Strange' behaviour due to DC motor
TLD: How do I minimise noise / electrical disruptions created by a DC motor?
Situation
I would like to control a DC motor through DMX512. Therefore I connected a Max485 chip to an Arduino to receive ...
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How to calculate a differential + common mode LPF circuit?
I'm trying to validate my understanding of a differential + common mode LPF circuit using the AK4499EX datasheet (019001308-E-00 2022/07 version, p. 47). It presents the following circuit:
and its ...
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Why is my encoder showing abnormal spikes on the oscilloscope readings? Any suggestions on what might be causing it?
So to summarize, I have these winch drives that I've put together. One of them went berserk during testing and now I'm diagnosing the problem. I have attached an oscilloscope to where the KEB servo ...
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SPI device stops working when integrating Schmitt triggers and ESD diodes
I am integrating a BME680 temperature, pressure and humidity sensor using SPI.
When I only use 33 Ohms series resistors, the system works fine. However, when adding Schmitt triggers (NL27WZ17DFT2G), ...
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Localized interference between 2 distant points [closed]
Lets say an emitter sends a directional carrier wave of 60 Hz that can travel up to 100 km.
Then, at 50 km from source, another weaker wave of 60 Hz is emitted.
This weaker wave is off phase compared ...
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Why do PALs have higher speed than PLAs?
When considering speed I have learned that PLAs are much slower than PALs. As each signal has to propagate through same sequence of gates (in series) why there is a speed difference?
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How do I relate input and output signals and find the output for other input signals in LTI system?
I am studying about signals and systems. I came across a few practice problems. For the below question, I was able to mimic the input and output waves shown in ...
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How do I represent a signal as the real part of complex exponential and find the value of complex amplitude & complex frequency?
Context:
I was solving some practice problems and came across this problem. I know the complex exponential is:
$$ s(t)=Ae^{i({\omega}t+{\phi})}{\Rightarrow}Ae^{i{\phi}}e^{i{\omega}t} $$
Where \$Ae^{i{\...
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Is my understanding about the ECG waveform is correct or not
I need to design an amplifier for an ECG signal.The signal specification is given below.
BW = 0.47Hz..40Hz (-3dB) – Limited by the system
Signal amplitude max. 10mVPV (peak-to-valley), DC offset max ±...
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ROC of Laplace Transform of a time shifted impulse signal
If x(t) is of finite duration and is absolutely integrable, then the ROC is the entire s-plane.
This is stated and proved formally in the book of signals and systems by Oppenheim in the context of ...
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Interdependency Issue in Power Enable Circuits for Sensor and Modem Controlled by STM32L476RG
I have designed a power enable circuit to control the power supply to both a sensor and a modem, each with its own dedicated power enable circuit. The MCU used is the STM32L476RG, and the power enable ...
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