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
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
 |
 |
| 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 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 FM Radio Using Tuning Capacitor
Please send your ideas, which are very important for our success…
#1 by f de mahy on January 27th, 2013
HELLO I M TRYING TO MAKE THE TDA RECEIVER IN THE 75 MHZ RANGE .IT SEEMS THE PROBLEM I HAVE IS THE AUDIO IS FEEDING BACK INTO THE OSCILLATOR .I VE TRIED DECOUPLING THE LINES WITHOUT ANY SUCCESS.ANY IDEAS
THANKS.
FdeMahy
#2 by Edson on November 7th, 2012
Does this circuit really works ? Can I tune with it
the aircraft band (118 – 136 MHz ) ?
Thanks.
#3 by gede7 on June 28th, 2012
Will this circuit work on 9 V battery?
#4 by rezasat on May 15th, 2012
hello
#5 by Grace on March 6th, 2012
how can we receive signals? we can’t even have one.
and is that fine we took out the mute switch?
#6 by NeedInfo on February 15th, 2012
what are the materials of the capacitors?
#7 by Manuel on August 19th, 2011
I’m about to make this circuit, but I have one question
can I use a normal capacitor with a range between 15 and 30 pF as explained above as tuning capacitor? so without using the one you put in this circuit.
#8 by Taiye on April 22nd, 2011
Can sombody mail me on i can d calculations d fm receiver 4 project sake
#9 by seetharaman on May 1st, 2010
Hi Dyke you can use this IC between 1.5 to 110MHz FM range. refer the following doc,
http://www.pira.cz/pdf/TDA7000.pdf
use suitable tuned circuits.
#10 by Taylor Dyke on March 25th, 2010
Hello there, i am attempting this circuit, and i have a few questions.
1) How do you determine the values of VC1, L1 and L2 if you wish to cover other parts of the FM band, for example 27mhz instead of the 87-108 mhz band (i presume this schematic is for the typical FM radio band)
2) have you placed any errors purposely to stop reproduction of this circuit??
I will only be making one of these circuits as im trying to experiment with electronics and i hope you reply sonn
regards, Taylor