FM receiver circuit using transistor

This is FM radio receiver circuit that very small size and works well, although the sensitivity is poor. The principle of this circuit is to use the generator frequency circuit. Which consists of Q2 and Q3, they work by producing a frequency sync with the frequency has been derived. By the Q1 which acts as a pre-amp extension of the frequency VHF range wider. We may cut the Q1 out, then connect the antenna at the C4, but the sensitivity of this circuit will decrease.

We can adjust the C5 in the frequency generator circuit. To control the frequency from 87MHz to 108 MHz. And the frequency of the incoming sync with the frequency of the generator itself. Therefore, the frequency deviation of the signal received from the antenna to the audio signal. By the frequency modulation is across the VR1 + R5. the low pass filter circuit, R6/C6 be the frequency of sound, then after be amplified by the Q4 and Q6, and is enter to output by C9 respectively.

Note:

Also this circuit you can look at Basic FM Receiver Circuit It easy and work than this circuit.

Small FM radio receiver circuit

Details are as follows: Coil.
L1 is 10 turns of 25 SWG enamel coated copper wire wound with a inside diameter of about 3 mm, The L2 is 13 turns of 25 SWG inside diameter of about 3 mm, L3 is 4 turns of 18 SWG inside diameter of about 5 mm.

17 Comments

  1. Deepak June 29, 2012
  2. Deepak June 29, 2012
  3. Deepak June 29, 2012
  4. ali July 2, 2012
  5. alex July 12, 2012
  6. chayapon July 16, 2012
  7. spero October 1, 2012
  8. spero October 1, 2012
  9. spero October 1, 2012
  10. spero October 2, 2012
  11. aurel February 19, 2013
  12. blue bottom shoes April 9, 2013
  13. stefan May 31, 2013
  14. Elect Hayabusa June 21, 2013
  15. momename December 5, 2014
  16. RAHUL kumar January 9, 2015
  17. Lavr April 27, 2015

Add a Comment

Your email address will not be published. Required fields are marked *