Circuit diagram, breadboard wiring, frequency response Analog Communication Lab
AIM
To set up Low pass filter (LPF) to find out the cut off frequency.
EQUIPMENTS/COMPONENTS
Sl.No Name & Specification. Quantity required.
1 CRO/DSO 1No.
2 Function generator 1No.
3 Capacitors 0.1uF 1 No
4 Resistors- 1.5 kΩ 1 Nos.
PRINCIPLE
Filter is a circuit that can be designed to modify, reshape or reject all unwanted
frequencies of an electrical signal and accept or pass only wanted signals. Passive Filters are
made up of passive components such as resistors, capacitors and inductors and have no
amplifying elements (transistors, op-amps, etc) so have no signal gain, therefore their output
level is always less than the input.
Filters are so named according to the frequency range of signals that they allow to pass
through them, while blocking or attenuating the rest. The most commonly used filter designs are
The Low Pass Filter (LPF)
The low pass filter only allows low frequency signals from 0Hz to its cut-off frequency,
point to pass while blocking those any higher. Cut off frequency F = 1/(2πRC).
PROCEDURE
1. Check all the components, equipments and signal probes
2. Set up the connections as per the circuit diagram
3. a) For LPF (Passive & Active)
Apply 1V pp/100Hz sine wave to the circuit
Vary the frequency of input signal up to 5kHz with a uniform increment of 200 Hz.
Observe the output waveform in the CRO, and measure amplitude
F = 1/(2πRC)
Let fc=1KHz
R1=1.6K, C1= 0.1μF
OBSERVATIONS
Vin=1 V pp
Sl. No Frequency (Hz) V out(v) Gain (Vout/Vin) Gain in dB 20 log(Vout/Vin)
Негізгі бет RC low pass filter Circuit lab experiment AC Lab| Circuit Diagram | Breadboard Wiring
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