Increase the supply voltage

By using quartz crystal

Using L and C

Improve the property of circuits

AC 127

BF 194B

BC 148B

AC 188

10 time constants

7 time constants

5 time constants

3 time constants

Apply opposite polarity of signal

Provide negative feedback

Using high Q coils and good quality capacitors

Increase the supply voltage

LC values required is too large

LC components are not available

LC tank circuit does not produce AF signals

LC tank circuit operation requires high voltage