A filter modifies signals based on their frequency.

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72 views

Decoupling Capacitor (High Frequency Spike)

Wondering if anyone could help me rectify my understanding of decoupling capacitors and their role in suppressing high frequency voltage spikes (particularly increases in supply voltage). Similar ...
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1answer
35 views

Applying 1st order filter [on hold]

I have a 1st order continuous filter T * y'(t) + y(t) = u(t) . I discretized the equation by hand and applied filter and I used ...
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3answers
75 views

Why are ratios relevant, but not the increments when defining center frequency of a band-pass filter?

First of all, here is my directly related previous question: Why is center frequency of a bandpass filter is given by the geometric average of the two cutoff frequencies? Olin Lathrop explained very ...
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2answers
37 views

high frequency noise from multiple feedback op amp

I've built a multiple-feedback low-pass filter with a TL084IN op amp. I've simulated the filter for the chosen R and C values using LTSpice and it looks like I was expecting: . I've also assembled ...
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1answer
28 views

Can I use barrier rectifier as a diode in bulk converter circuit?

I have this LC circuit which will work under 12V and quite high load (10-20A): The diode D1 must be a shottky diode but the only similar thing I have at the moment is actually 3-leg MBR3045CT ...
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3answers
450 views

Using LC filter instead of RC filter in mains powered circuits

Above is a dimmer circuit. In some of these circuits I see a toroid inductor together with a capacitor forming a low pass LC filter which is called choke filter. My questions are: Why is RL used ...
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1answer
42 views

Are the terms corner frequency,cutoff frequency and break frequency the same?

I am studying electronics engineering and I came across these terms..how are these terms different from each other?
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0answers
31 views

CR 2nd order with 2 poles at same location

Is it possible to make a 2nd order CR LPF or HPF where the cut off frequencies for each pole are equal? Here is a calculator for this system which includes the transfer function. ...
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4answers
47 views

Remote Controlled Vehicle Design

For our term project we have to design a vehicle which has to have three functions; move forward, turn left and turn right. The vehicle will have two dc motors that will work at the same speed for ...
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1answer
47 views

Avoiding electrolytic capacitors in high-pass filters with sub-Hz cut-off

We need to design a HPF filter to AC couple a bipolar signal to a high gain amplifier. Any substantial DC left would saturate the amplifier, and thus it must be removed with the high-pass ...
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0answers
18 views

Active damping for Application in High Power with LC-filter

I am working on a circuit which consists of inverter subsequent by a filter as shown in the figure, the filter consists of LC and RC as branch for the filter. I have gotten after the filter a ...
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1answer
42 views

RC filter with an square wave input (checking my math and find my error, if it is somewhere) [duplicate]

I've this RC filter circuit (r is connect to earth on the bottom): My Vin is a square wave: With Laplace transform I derived that: $$Vout(s)=\frac{r}{r+\frac{1}{cs}}\cdot Vin(s)$$ and this ...
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1answer
58 views

RC filter with an square wave input

I've this RC filter circuit (r is connect to earth on the bottom): My Vin is a square wave: With Laplace transform I derived that: $$Vout(s)=\frac{r}{r+\frac{1}{cs}}\cdot Vin(s)$$ and this ...
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1answer
33 views

DC-LVDT Output noise filtering

I am working with the DC-LVDT Omega 620-25 http://www.omega.com/pptst/LD620.html Manual: http://www.omega.com/Manuals/manualpdf/M4345.pdf Specs: http://www.omega.com/pressure/pdf/LD620.pdf I am ...
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1answer
35 views

Narrow bandpass filter using maximally flat LPF prototype design

I'm doing a project involving wireless power transfer, where an LED will be turned on via 2 induction coils (tx and rx). The interfacing power circuitry for this has already been figured out (an ...
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2answers
52 views

Is it OK to combine passive and active filters?

I am a newbie to filter design. I would like to know: is it common to use a first step active filter followed by five or six passive LC-filters for very high orders? Or do people usually don't combine ...
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1answer
15 views

MAX7414 low-pass filter OS pin

The datasheet of the MAX7414 low-pass filter shows the OS pin connected to a voltage divider to set the output offset when the IC is used on a single rail supply. Can the OS pin be supplied by the ...
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1answer
73 views

How to simplify opamps in circuits for limit analysis

I know that when simplifying electronic circuits for limit analysis you can e.g. replace capacitors with closed lines and coils with open lines. e.g.: the equivalen at high frequencies would be: ...
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0answers
90 views

Circuit for voltage division and DC shift doesn't work

I've connected the circuit below on a breadboard and tested it in the lab: Components: ...
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0answers
22 views

Matched Filter Design

A digital signal is transmitted with the following waveform. \$s(t) = \left \{ \begin{array} & A\ \cos(\omega_ct)*\mathrm{rect}(t - (T/2)), && bit = 1 \\ 0 , && bit = 0 ...
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3answers
74 views

Understanding Ferrite Chokes

I am looking to clean up the power supplied to a video transmitter on the UAV I am building. The video transmitter consumes about 200mA of current at 16V DC. The 16V line has noise from motors and ...
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1answer
88 views

What is the purpose of resistance & capacitance in parallel to Load ( refer ckt )

What is the purpose of resistance & capacitance in parallel to Load ( refer ckt ) ? As per my understanding these capacitor & resistor is for filtration purpose ( kindly clarify the same) . ...
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1answer
28 views

Cut-off frequencies for common mode and differential mode filter?

Attached is the circuit section for the differential signal amplification. The circuit is comprising of common mode and differential mode filter capacitors.So there will be two different cut-off ...
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43 views

Matlab filter to vhdl

I want to filter a sine wave signal using Altera FPGA(cyclone IV). The sine wave is first converted by an ADC with Fs= 20Mhz, then stored into a register inside the FPGA. The frequency of my signal is ...
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1answer
66 views

What happens if you put two coils in parallel

I want to build an LC-Filter from a tutorial I found (German language, if anyone is interested, I'll add a link). In that tutorial, a 330uH Coil with a max amp of 1A is used. I have some 330uH ...
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1answer
39 views

Uses of Electronic Filters? [closed]

Can anyone tell the real life examples of electronic filters? Why do we need them ? Whey do we need certain range of frequencies while others are rejected ? Sorry i am new in electronics so please do ...
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1answer
28 views

How can i 4th-order BPF analysis please

How can i calculation center frequency?, and Q-factor and BW? please detail analysis
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1answer
46 views

Can we determine if a filter is butterworth or chebyshev from its physical topology?

Can all analog filters be classified as Bessel, Elliptic, Butterworth or Chebyshev? Given a physical ladder topology of several stages of {L, C or LC} in {series or parallel}, is it possible to ...
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2answers
56 views

Filter design for high power voltages Partial discharge detector

Hell all, I have a signal imposed on a 60Hz 800V AC voltage that I need to retrieve via MCU. The signal is in the range of 10KHz to 50KHz with peak to peak voltage ranging from 5 to 50 volts . The ...
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0answers
18 views

Voltage across all the components of a Parallel resonant band-stop filter?

Ive been trying to solve this for a while and i haven't made much progress probably because ive been doing it wrong. given w = 1M i found the reactance of the capacitor and inductor to be = ...
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1answer
85 views

Filtering a frequency and its harmonics (Matlab)

I want to remove all the frequency components from a .wav file except those within \$\pm 25\$ of \$523 \ Hz\$ as well as its harmonics. Attempt: I used a high pass filter first to suppress ...
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2answers
50 views

Band-pass filter with a given impulse response (Matlab)

I am trying to pass a .wav sound waveform through a band pass filter whose impulse response is given by \$ h(t)=50u(t) \exp(-10t) \sin(2 \pi 440t), \$ I have imported the file into Matlab as ...
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1answer
45 views

Best values for an RC low-pass filter

I have a sonic sensor which outputs analog voltage in 0-10V range with some noise on it. The sensor will measure the distance changes so I'm interested in an output signal not more than 40Hz. The ...
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2answers
41 views

implementation different than simulation

I have to build the below series RLC circuit , and output its bode diagram using NI ELVIS Instrument Launcher. It is for a bandpass filter, so the output is taken across the resistor. Before ...
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1answer
156 views

How to Filter Very High Voltage Power Supply Noise

Any suggestions of how to filter out this noise? Basic filter math is not working out. I am adapting a cheap commercial HV supply (variable DC voltage up to 40kV at 10mA) for physics experiments. ...
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0answers
26 views

Bandpass attenuation does not fit from lowpass transformation

I got a small problem and which I can't solve. I am designing a bandpass filter for use in a compressor, I am using the method of transforming a lowpass filter into a bandpass filter. I First design ...
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2answers
98 views

Missing low frequency tones from bluetooth audio output

Currently I'm working on a project which uses a bluetooth module (Bluegiga WT32i) to get audiostreams from my iphone to a 3.5mm stereo jack input for a car AUX input. The problem now is that I have ...
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1answer
55 views

What's the purpose of this RC filter?

The circuit is the following and i think this RC filter is used for anti debounce purposes but i'm not sure. Is it to prevent the optocoupler and the indicator LED from being "damaged" by the debounce ...
3
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1answer
74 views

Curve Tracer Power Supply Puzzle

On my continuing odyssey to analyze real-life circuits as a way to expand my knowledge, I'm studying this Heathkit Curve Tracer: IT-1121 Curve Tracer Schematic There are a couple of features about ...
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2answers
62 views

Blocking DC when driving a buzzer with a PWM signal

I am driving a piezo buzzer with a PWM signal (typical freq. 100Hz-1kHz) in order to generate 'beeps'. However due to software constrains (*), when the PWM signal is stopped I can't control if it ...
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1answer
100 views

How to build a circuit that generates a sine wave?

How can I build a circuit to generate sine waves? What I am working on is building a 555-timer circuit that gives 50% duty cycle square wave, then using a low-pass or band-pass filter tuned to the ...
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1answer
48 views

How to protect constant LED current from ripples & clamps?

I need to develope a constant current LED Driver. The product must be portable and as small as possible. So I can not use SMPS, I have use AC/DC adapter as source. This is the AC/DC adapters output: ...
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1answer
37 views

Given input voltage and a set of output voltages of a second order low pass filter, how to calculate the gain of the filter?

I know that voltage gain = 20 log (Vout/Vin) dB, but the slope of the Bode s plot of second order low pass filter is -40dB/decade compared to the first order low pass filter with -20dB/decade. So ...
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0answers
91 views

All-Pass Filter that increases phase as frequency increases?

All the all-pass filters I've seen (both lead and lag versions) start at some phase and then lower the phase at some frequency. I need it to increase the phase instead, so instead of having a negative ...
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1answer
36 views

What frequency bandwidth should an accelerometer operate for measuring punching and kicking movements?

I'm trying to choose the bypass capacitors for a schematic circuit that measures the acceleration (in g) for punching, kicking, throwing, etc. But I don't know what to place on the x, y, z output of ...
0
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1answer
42 views

lead high pass filter and lag low pass filter

I have a question regarding lead high pass filter and lag low pass filter. I do not quite understand the reasoning behind these two special case (when z=0) ? Thanks!
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2answers
64 views

Using a reflective sensor to detect green-

I need to build a circuit that detects whether a green object is in front of it. As I do not need to know which color is in front of the sensor, but only if there is a green object, I thought a ...
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2answers
89 views

Is this an RC filter in the circuit for a nightlight?

So there is this nightlight (a little flower that you plug in directly into a mains socket and switching it on gives you some light to light up your bedroom at night) which I dismantled and tried to ...
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2answers
75 views

Current Generalized Immittance Converter (CGIC) Nodal Analysis

Below shows the current generalized immittance converter. I am trying to derive the transfer function (V3/Vin) of the said filter but I am getting problems in obtaining the voltages at some of the ...
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2answers
69 views

Adding Low Pass Filter to Open Collector Hall Sensor

I'm using a gear tooth sensor to create pulses when a metal object passes the sensor. There's a lot of noise on the signal so I decided a simple low pass filter would suffice(f-cutoff = appx.400hz). ...