TDA7000 FM Radio Receiver Circuit


Tda7000 fm radio or receiver with lm386 amplifier

TDA7000 FM Radio Receiver Circuit Using Tuning Capacitor
GENERAL DESCRIPTION The TDA7000 is a monolithic integrated circuit for mono FM portable radios or receivers where a minimum on peripheral components is important (small dimensions and low costs).
The IC has an FLL (Frequency-Locked-Loop) system with an intermediate frequency of 70 kHz. The i.f. selectivity is obtained by active RC filters. The only function which needs alignment is the resonant circuit for the oscillator, thus selecting the reception frequency. Spurious reception is avoided by means of a mute circuit, which also eliminates too noisy input signals. Special precautions are taken to meet the radiation requirements.

The TDA7000 includes the following functions:
· R.F. input stage
· Mixer
· Local oscillator
· I.F. amplifier/limiter
· Phase demodulator
· Mute detector
· Mute switch

Tda7000 fm radio receiver circuit using Tuning Capacitor

This circuit is typical using with a  LM386 for the audio power amplifier.

With a minimum on peripheral components we can build a high performance and small FM radio receiver .

PARTS LIST

C1
0.22µF (224)

C2
22nF (223)

C3
10nF (103)

C4
27pF

C5
22pF

C6
3.3nF (332)

C7
180pF (181)

C8
330pF (331)

C9
3.3nF (332)

C10
150pF (151)

C11
82pF

C12
68pF

C13
220pF (221)

C14
100nF (104)

C15
330pF (331)

C16
220pF (221)

C17
1.5nF (152)

C18
470nF (474)

C19
100nF (104)

VC1
FM Tuning Capacitor (15-30pF)

R1
10kΩ

R2
22kΩ

R3
10kΩ

L1
5¾ (5.75) Turns of 23 swg enamelled copper wire close-wound on a 3mm diameter. (≈78nH)

L2
4¾ (4.75) Turns of 23 swg enamelled copper wire close-wound on a 3mm diameter. (≈70nH)

IC1
TDA7000

ANT
Telescopic antenna or 1m wire

S1
Mute Switch (mute is disabled when switch is on.)

TDA7000 FM Receiver Coils

Tda7000 fm radio Tuning coil L1
Tda7000 fm radio antenna coil L2

L1:Tuning Coil, 5¾ (5.75) Turns of 23 swg enamelled copper wire close-wound on a 3mm diameter.
L2: Antenna Coil, 4¾ (4.75) Turns of 23 swg enamelled copper wire close-wound on a 3mm diameter.

TDA7000 IC

TDA7000 FM Radio OR FM Receiver IC

TDA7000 QUICK REFERENCE DATA

Supply voltage range (pin 5)
VP
2.7 to 10 V

Supply current at VP = 4.5 V
IP
typ. 8 mA

R.F. input frequency range
frf
1.5 to 110 MHz

Sensitivity for -3 dB limiting
(e.m.f. voltage)
(source impedance: 75 Ω; mute disabled)
EMF
typ. 1.5 mV

Signal handling (e.m.f. voltage)
(source impedance: 75 Ω)
EMF
typ. 200 mV

A.F. output voltage at RL = 22 kΩ
Vo
typ. 75 mV

Tda7000 Block fm radio receiver

TDA7000 FM Radio Using Tuning Capacitor

Tda7000 fm radio Receiver


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