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The major problem with resistors at high frequencies is for wire-wound (power) resistors, that will act as inductors at high frequencies. In addition, very small resistors, like chip resistors, can also exhibit capacitive effects. Special high frequency resistors are designed to offset these effect.[1]
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Advantage of a choke coil over a resistor in a power supply filter?
A choke is an inductor. For typical power frequency, an inductor will slightly change the power factor, but will not actively use much energy. An abnormal voltage spike on a power supply is equivalent to voltage at a much higher frequency. Inductors appear to be a much greater impedance to high frequencies. This allows the choke to pass "normal" power, while at the same time it blocks "abnormal" power.A resistor acts independent of frequency. It will limit the effects of the high frequency voltage spikes by dissipating their energy, but it will do the same for the normal power system frequency. In effect, it is always using power, when the choke only uses what you don't want to get to the power supply.
What is the difference between voltage gain obtained with bypass capacitor and without the bypass capacitor?
A: A TRANSISTOR gain is determined by current flow on the collector by adding a resistor to the emitter this current flow is reduced by adding or bypassing this resistor with a capacitor the net effect is that this emitter resistor will be reduced in value as frequency increases therefore change gain as a function of frequency input
How do you convert low frequency to high frequency with a circuit?
You typically create a DC power supply from the low frequency, and use that to run a high frequency oscillator and amplifier. If there needs to be a relationship between frequency in and frequency out, often there is a divider running on the high frequency side in combination with a phase locked loop synching up to the low frequency side.
What is the name used for a high power variable resistor?
Rheostat
What is a high end frequency scanner?
A: It is a terminology to imply that the scanner will be used at the hi end of frequency as opposed to low frequency
Frequency response curve of RC coupled amplifier?
at low frequency less than 50hz the voltage gain decreases with decreasing frequency and at mid frequency{50hz to 20khz} the voltage gain is uniform because resistor value are independent of frequency change and at the high frequency votage gain falls.
How do you calculate the resonance frequency of a metal rod?
Resonant frequency is the frequency where the voltage across the tuned filter is maximized. Inject a sine wave through a resistor into the filter, and adjust frequency for peak amplitude.At higher frequencies, such as RF, this becomes interesting because everything disturbs the circuit, including the resistor, because it is no longer a pure resistor. Measurment of resonant frequency in RF circuits is best done in situ.Resonant frequency is measured like all frequencies in Hertz or cycles per second.
How will be the outputs across the inductor and resistor if you keep the frequency of the input signal very low?
For a low frequency source, the voltage across the inductor tends to zero because its impedance is proportionnal to source frequency, whereas the voltage across the resistor tends to the voltage source value.
What does the U stand for in UHF?
Ultra high frequency.
What frequency does high energy electromagnetic have?
High energy is high frequency.
When you turn the knob of your radio to tune to a station what do you chang?
You change a variable resistor in the the tuning circuit. The value of the resistor dictates the frequency that the radio is receiving.
How do I fix the blower control on a 1992 Chevy cheyanne since it only blows on high speed?
Check the resistor if it only works on high Check the resistor if it only works on high Check the resistor if it only works on high
What is high frequency tuned amplifier?
High frequency amplifier is a device which is tuned by high frequency. Tuned means the overlapping of generated frequency with that amplifier.
What is damaged resistor?
A damaged resistor is one that it fried by current that is too high
Is high frequency sounds low pitch?
No, high pitch means high frequency.
Does A high-pitched sound result from low frequency waves?
high pitch is high frequency, low pitch is low frequency
Does a high pitch sound result from low frequency waves?
high pitch is high frequency, low pitch is low frequency
