Contents

Results and application

RESULTS AND APPLICATIONS

 

·        Some figure or graph for modulator or voltage controlled oscillator circuit

 

 

 

The following  graph is showing the waveform at point A  when switch is turned on.

 

 

 

The following  graph is showing the waveform at point A  when switch is turned on.

 

 

 

 

 

The following  graph is showing the waveform at point A  when switch is turned off.

 

 

 

 

 

The following  graph is showing the waveform at point A  when switch is turned off.

 

 

·       Amplifier section of the circuit

If we put 1V AC signal, we will get following fig at input pointed by A.

If we put 1V AC signal at input, we will get following fig at output.

Case 1:

We have done several combinations with the circuit. It is seen that resistor and capacitor which are driving by the input is changing the output. Here is the table considering the circuit of figure-1.

 

Resistance(R4)

Capacitance

Voltage across the speaker

10k

22uf

656.5nv

22k

22uf

1.127uv

33k

22uf

1.772uv

47k

22uf

4.319uv

56k

22uf

3.805uv

63k

22uf

3.195uv

82k

22uf

65.43uv

100k

22uf

15.94uv

220k

22uf

288.9nv

330k

22uf

963.9nv

Case 2:

If resistance varies then output voltage also varies non linearly, because we can see that voltage has grown up and fall down slowly. If we fixed the resisitance with 100k and varies the capacitance output doesn’t varies.aHere is the table considering the circuit in figure-1.

 

Resistance(R4)

Capacitance(C2)

Voltage across the speaker

100k

0.01uF

15.94uV

100k

0.1uF

15.94uV

100k

0.15uF

15.94uV

100k

0.22uF

15.94uV

100k

2.2uF

15.94uV

100k

3.3uF

15.94uV

100k

4.7uF

15.94uV

100k

10uF

15.94uV

100k

22uF

15.94uV

100k

47uF

15.94uV

Case 3:

If we consider the amplifier section which has a bypass capacitor C3  output varies with C3, output varies linearly with some extend then it goes in saturation region. Here is the table considering main circuit in figure -1.

 

Capacitance(C3)

Voltage across the speaker

0.22uF

9.235uV

0.33uF

10.80uV

0.47uF

12.0uV

4.7uF

15.48uV

2.2uF

14.95uV

3.3uF

15.27uV

22uF

15.86uV

33uF

15.90uV

100uF

15.94uV

220uF

15.96uV

This circuit is henceforth used in low noise generation in transponder link with a amplifier based approach. The generated signal provides a high gain as well as reduces noise.

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