future engineers

future engineers

Simple and powerful F.M. Receiver

Communication in F.M. band is easy, less expensive and has many more advantage. As we have already published Simple F.M. transmitter circuit in previous article. Now, here is a circuit diagram with description of Powerful F.M. receiver using single IC used to receive frequency range of 88 MHz to 108 MHz in F.M. band. You can also use F.M. receiver  circuit in radio, tape recorder, stereo etc.

Circuit Description simple and powerful F.M. receiver

With the circuit described here (F.M. receiver) one can easily receive F.M. signal and is build around IC TEA5591 (IC₁). Transmitted F.M. R.F. signal is received by telescopic antenna and is given to pin 2 of IC₁ passes though band pass filter made from coil L₂ and capacitor C₄. R.F. signal given to IC₁ is amplified and is tuned with the help of capacitors C₉, C₁₃ and coil L₁. Coil L₃ with capacitors C₈ and C₁₄ is configured as oscillator and its output is given to pin no 22 and 23 of IC₁ in order obtain IF frequency by mixing with tuned R.F. frequency. Tuned IF frequency of 10.7 MHz is obtained from amplifier made from coil L₄ and capacitors C₁₀ & C₁₁. Ceramic filter XT₁ and XT₂ is used to filter IF frequency and is given to pin no 4 of IC₁. Internal detector stage is used to detect F.M. signal. Finally output from F.M. receiver is obtained from pin 11 and is given to audio amplifier stage.

PARTS LIST

Resistor (all ¼-watt, ± 5% Carbon)

R₁ = 820 Ω

Capacitors

C₁, C₂ = 4.7 µF/35V

C₃, C₅ = 470 PF

C₄ = 22 PF

C₆ = 0.02 µF

C₇, C₁₀ = 0.01 µF

C₈, C₉ = 27 PF

C₁₁ = 47 KPF
C₁₂ = 220 µF/25V

VC₁ = 22 PF

VC₂ = 39 PF

Semiconductors

IC₁ = TEA5591

D₁ = 1N4007

Miscellaneous

L₁, L₃ = 3 turns on any pencil ; 21 gauge wire

L₂ = 5 turns on any pencil ; 21 gauge wire

L₄ = F.M. I.F.T.

XT₁, XT₂ = 10.7 MHz

Antenna