A filter can be designed using an op amp by by replacing the resistors in an inverting or non-inverting amplifier with inductors or capacitors. Search for "op amp" on wikipedia for some simple schematics as a starting place. If you understand the basics of filter output and bode plot calculations, you should be able to replace R1 or R2 with C1 (1/jC1w) or L1 (jwL), and analyze the output vs. input characteristic.
Note op amps have limitations on frequency response, so this approach is good for fairly low frequencies - if you get into the high MHz, or GHz, a passive filter circuit becomes necessary.
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The parallel-tuned filter in antenna circuit rejects only the undesired frequencies.
That depends what circuit it is in. If it is in a sweep circuit (vertical/horizontal) no because it will change the frequency of the circuit. If it is in a power supply circuit, probably yes becuase it is probable only being used as a filter. BUT if that leg of the power circuit supplies a sweep circuit, no.
An inductive filter is in fact an LC circuit in which an inductor is connected in series with the capacitor. This arrangement is also known as a low-pass filter. http://www.answers.com/topic/inductive-filter
It is a direct-current amplifier in which the dc input signal is filtered by a low-pass filter, then used to modulate a carrier so it can be amplified conventionally as an alternating-current signal; the amplified dc output is obtained by rectifying and filtering the rectified carrier signal.
The instrumentation amplifier provides isolation, and gain to the output of the Wheatstone Bridge. It is placed before filtering because the low output of the gauges would suffer from induced noise in the filter circuit if left unamplified.
Exciter Power amplifier Input filter/amplifier Demodulator Audio processor
Exciter Input filter/amplifier Demodulator power amplifier audio processor
There is no power to it. The 'protected' light indicates that the filter circuit is operational and has power to it. The 'grounded' light indicates whether a device is properly grounded. But it still needs power to the surge protector to light it.
An active filter is a type of analog electronic filter that uses active components such as an amplifier. Amplifiers included in a filter design can be used to improve the performance and predictability of a filter, while avoiding the need for inductors (which are typically expensive compared to other components). An amplifier prevents the load impedance of the following stage from affecting the characteristics of the filter. An active filter can have complex poles and zeros without using a bulky or expensive inductor.
capacitor
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by combining a low-pass filter with a high-pass filter.[1]
To cut off unwanted frequencies, unwanted frequencies are called noise.
The parallel-tuned filter in antenna circuit rejects only the undesired frequencies.
Install a bigger one
A circuit that doesn't require a lot of filtering such as a charging circuit for a battery. In a single capacitor filter, the sine wave or AC doesn't get completely eliminated.