F.M Radio Circuits and links
THE MOST GREAT THING YOU CAN DO IS USE RADIO WAVES AROUND YOURSELF AND ENJOY.
HERE ARE SOME COLLECTION OF FM RADIOS OF IC'S & TRANSISTORS.
YOU CAN WONDER HOW IN TODAY'S TECHNOLOGY, BECAUSE OF DIGITAL CHIPS THE RADIOS CAN BE IN ALL CONSTRUCTED SIZE OF A BOTTON CELL, THATS OF A CLEAR AND VERY HIGH FREQUENCY.
IF YOU HAVE HABBIT OF CONSTRUCTING A FM RECEIVER YOU CAN TAKE ANY OF THE CIRCUITS AND TRY AND ALL THEY WORK.
IN MARKET, I AGREE THAT SOME OF COMPONENTS LIKE INDUCTORS, VARIABLE CAPACITORS, OR IC'S MAY NOT AVAILABLE BECAUSE OF DIGITAL CHIPS WHERE WHOLE RADIO IS CONSTRUCTED IN A SINGLE CHIP. BUT DON'T WORRY I WILL HELP YOU IN TELLING ANY ALTERNATIVE.OK -
HERE ARE SOME IC CIRCUITS-
1)
2) 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
With a minimum on peripheral components we can build a high performance and small FM radio receiver .
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 .
TDA7000 FM Receiver Coils
This Wideband
VHF FM receiver uses a common TDA7000 IC and will tune between
70MHz and 120MHz. 200mW AF power
into a 16ohm speaker is gained using a TBA820 O/P IC. Both inductors L and L1 should be the same using
22SWG. For 70MHz 6 turns on 7mm former quite
closely wound, 100MHz
5turns and 115MHz 4turns. The gain
of the receiver
drops of considerably after 110MHz. Datasheets are available. Look at my Technical
Info page. The 90pF Tuning Capacitor is actualy two trimmers
in parrallel. The main one being 22pF Variable Capacitor and a 75pF Trimmer.
HERE IS MY FIRST FM RADIO USING TDA 7000 WORKS VERY WELL AND WITH LOUD SPEAKER.
HERE ARE SOME COLLECTION OF FM RADIOS OF IC'S & TRANSISTORS.
YOU CAN WONDER HOW IN TODAY'S TECHNOLOGY, BECAUSE OF DIGITAL CHIPS THE RADIOS CAN BE IN ALL CONSTRUCTED SIZE OF A BOTTON CELL, THATS OF A CLEAR AND VERY HIGH FREQUENCY.
IF YOU HAVE HABBIT OF CONSTRUCTING A FM RECEIVER YOU CAN TAKE ANY OF THE CIRCUITS AND TRY AND ALL THEY WORK.
IN MARKET, I AGREE THAT SOME OF COMPONENTS LIKE INDUCTORS, VARIABLE CAPACITORS, OR IC'S MAY NOT AVAILABLE BECAUSE OF DIGITAL CHIPS WHERE WHOLE RADIO IS CONSTRUCTED IN A SINGLE CHIP. BUT DON'T WORRY I WILL HELP YOU IN TELLING ANY ALTERNATIVE.OK -
HERE ARE SOME IC CIRCUITS-
1)
PARTS
LIST
(the following components will be included in the package unless otherwise stated) |
|
IC1 : TDA7000
FM Radio IC
IC2 : LM386 Audio Power Amplifier IC 18-pin socket -- (for TDA7000) 8-pin socket -- (for LM386) |
Ceramic
capacitors :
0.001 µF (#102 or 1n) -- x 1 pc 0.01 µF (#103 or 10n) -- x 1 pc 0.1 µF (#104 or 100n)-- x 4 pcs 0.0022 µF (#222 or 2n2) -- x 1 pc 0.0033 µF (#332 or 3n3) -- x 2 pcs 0.022 µF (#223 or 22n) -- x 1 pc 150 pF (#151 or 150) -- x 1 pc 180 pF (#181 or 180) -- x 2 pcs 220 pF (#221 or 220) -- x 2 pcs 330 pF (#331 or 330) -- x 2 pcs |
Electrolytic
capacitors : (10V min)
220µF or 470µF or 1000µF --- x 2 pcs 4.7µF ------------- X 1 pc |
|
Preset
10K (or 15K, 20K or 22K) (trim pot) C1 --- Ceramic cap (see * schematic) L1 --- Adjustable coil -- for tuning broadcast stations |
Resistors
Miscellaneous items
: 10Ω 1/4W or 1/6W --- x 1 pc 22K 1/4W or 1/6W --- x 1 pc
|
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/TDA7000-Radio.jpg){kind=link}
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
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 Radio Receiver Circuit
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
 |
 |
Wideband FM VHF Receiver
HERE IS MY FIRST FM RADIO USING TDA 7000 WORKS VERY WELL AND WITH LOUD SPEAKER.
MATERIALS REQIURED-BELOW PIC
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