TDA7000 FM Radio Receiver with LM386 Amplifier
TDA7000 FM Radio Receiver with LM386 Amplifier


TDA7000 FM Radio Receiver with LM386 Amplifier


Simple circuit and easy to assemble DIY TDA7000 FM radio receiver with LM386 amplifier chip. Assembling an FM radio is always something interesting to the electronics enthusiast. TDA7000 which integrates a mono FM radio all the way from the aerial input to the audio output. Outside of the TDA7000 IC there is only one tunable LC circuit for the local oscillator, a few inexpensive ceramic capacitors and one resistor. The TDA7000 dramatically reduces assembly and post production alignment costs because only the oscillator circuit needs adjustment during manufacture to set the limits of the tuned frequency band. The complete FM radio can be made small enough to fit inside a calculator, cigarette lighter, key-ring fob or even a slim watch. The TDA7000 can also be used as receiver in equipment such as cordless telephones, CB radios, radio-controlled models, paging systems, the sound channel of a TV set or other FM demodulating systems.

TDA7000 FM Radio Receiver with LM386 Amplifier

Until now, the almost total integration of an FM radio has been prevented by the need for LC tuned circuits in the RF, IF, local oscillator and demodulator stages. An obvious way to eliminate the coils in the IF and demodulator stages is to reduce the normally used intermediate frequency of 10.7MHz to a frequency that can be tuned by active RC filters, the op amps and resistors of which can be integrated. An IF of zero deems to be ideal because it eliminates spurious signals such as repeat spots and image response, but it would not allow the IF signal to be limited prior to demodulation, resulting in poor signal-to-noise ratio and no AM suppression. With an IF of 70kHz, these problems are overcome and the image frequency occurs about halfway between the desired signal and the center of the adjacent channel. However, the IF image signal must be suppressed and, in common with conventional FM radios, there is also a need to suppress interstation noise and noise when tuned to a weak signal. Spurious responses above and below the center frequency of the desired station (side tuning), and harmonic distortion in the event of very inaccurate tuning must also be eliminated. We have now developed a mono FM reception system which is suitable for almost total integration. It uses an active 70kHz IF filter and a unique correlation muting circuit for suppressing spurious signals such as side responses caused by the flanks of the demodulator S-curve. With such a low IF, distortion would occur with the ±75kHz IF swing due to received signals with maximum modulation. The maximum IF swing is therefore compressed to ±15kHz by controlling the local oscillator in a frequency-locked loop (FLL). The combined action of the muting circuit and the FLL also suppresses image response.

Using the TDA7000 results in significant improvements for all classes of FM radio. For simpler portables, the small size, lack of IF coils, easy assembly and low power consumption are not the only attractive features. The unique correlation muting system and the FLL make it very easy to tune, even when using a tiny tuning knob. For higher-performance portables and clock radios, variable-capacitance diode tuning and station presetting facilities are often required. These are easily provided with the TDA7000 because there are no variable tuned circuits in the RF signal path. Only the local oscillator needs to be tuned, so tracking and distortion problems are eliminated.

Part Value Description Quantity
Resistors 1/4W 5%
R1 22k Red, Red, Orange, Gold 1
R2 10K Brown, Black, Orange, Gold 1
R3 5.6K Green, Blue, Red, Gold 1
R4 82 Gray, Red, Black, Gold 1
R5 1.5K Brown, Green, Red, Gold 1
R6 100k Brown, Black, Orange, Gold 1
R7 270K Red, Violet, Yellow, Gold 1
R8 4.7 Yellow, Violet, Gold, Gold 1
R9 150K Brown, Green, Yellow, Gold 1
R10 100 Brown, Black, Brown, Gold 1
R11 560 Green, Blue, Brown, Gold 1
C1 47p (47) Ceramic capacitor 1
C2 2.2n (222) Ceramic capacitor 1
C3 39p (39) Ceramic capacitor 1
C4, C17, C21, C24 100n (104) Ceramic capacitor 4
C5 220p (221) Ceramic capacitor 1
C6 150n (154) Ceramic capacitor 1
C7, C12 330p (331) Ceramic capacitor 2
C8, C13, C19 10n (103) Ceramic capacitor 3
C9 180p (181) Ceramic capacitor 1
C10, C11, C15 3.3n (332) Ceramic capacitor 3
C14 150p (151) Ceramic capacitor 1
C16 1.8n (182) Ceramic capacitor 1
C18 220n (224) Ceramic capacitor 1
C25 220µ/12V Electrolytic capacitor 1
C20 1000µ/16V Electrolytic capacitor 1
C22, C23, C17 10µ/16V Electrolytic capacitor 3
C26 22n (223) Ceramic capacitor 1
C27, C28 27p (27) Ceramic capacitor 2
IC1 TDA7000 CI FM – DIL18 1
IC2 78L05 5V positive voltage regulator 1
IC3 LM386N-1 (lm386) CI Audio Amplifier 1
D1 bb105 or BB809 or equivalent Varicap Diode 1
D2 Zener Diode of 2.7V or 3.3V Zener Diode 1
T1 BC558 PNP Transistor 1
T2 2SC3355 NPN Transistor 1
ANT, ANT1 Connect Antenna 1
DC Terminal block 2 pins Power supply 1
OUT Terminal block 2 pins Audio output 1
L1 4,5 turns 10 mm diam. Coil 18 AWG wire 1
L2 5 turns 10 mm diam. Coil 18 AWG wire 1
P1 10K (103) Potentiometer 1
P2 100K (104) Potentiometer 1

Accurate LC Meter Capacitance Inductance Meter with 16F628 and LCD
Volt Ampere Meter with 16F876 Microcontroller and LCD display
Accurate LC Meter

Build your own Accurate LC Meter (Capacitance Inductance Meter) and start making your own coils and inductors. This LC Meter allows to measure incredibly small inductances making it perfect tool for making all types of RF coils and inductors. LC Meter can measure inductances starting from 10nH - 1000nH, 1uH - 1000uH, 1mH - 100mH and capacitances from 0.1pF up to 900nF. The circuit includes an auto ranging as well as reset switch and produces very accurate and stable readings.
PIC Volt Ampere Meter

Volt Ampere Meter measures voltage of 0-70V or 0-500V with 100mV resolution and current consumption 0-10A or more with 10mA resolution. The meter is a perfect addition to any power supply, battery chargers and other electronic projects where voltage and current must be monitored. The meter uses PIC16F876A microcontroller with 16x2 backlighted LCD.

50MHz 60MHz Frequency Meter / Counter with 16F628 & LCD
1Hz - 2MHz XR2206 Function Generator
60MHz Frequency Meter / Counter

Frequency Meter / Counter measures frequency from 10Hz to 60MHz with 10Hz resolution. It is a very useful bench test equipment for testing and finding out the frequency of various devices with unknown frequency such as oscillators, radio receivers, transmitters, function generators, crystals, etc.
1Hz - 2MHz XR2206 Function Generator

1Hz - 2MHz XR2206 Function Generator produces high quality sine, square and triangle waveforms of high-stability and accuracy. The output waveforms can be both amplitude and frequency modulated. Output of 1Hz - 2MHz XR2206 Function Generator can be connected directly to 60MHz Counter for setting precise frequency output.

BA1404 HI-FI Stereo FM Transmitter
USB IO Board PIC18F2455 / PIC18F2550
BA1404 HI-FI Stereo FM Transmitter

Be "On Air" with your own radio station! BA1404 HI-FI Stereo FM Transmitter broadcasts high quality stereo signal in 88MHz - 108MHz FM band. It can be connected to any type of stereo audio source such as iPod, Computer, Laptop, CD Player, Walkman, Television, Satellite Receiver, Tape Deck or other stereo system to transmit stereo sound with excellent clarity throughout your home, office, yard or camp ground.
USB IO Board

USB IO Board is a tiny spectacular little development board / parallel port replacement featuring PIC18F2455/PIC18F2550 microcontroller. USB IO Board is compatible with Windows / Mac OSX / Linux computers. When attached to Windows IO board will show up as RS232 COM port. You can control 16 individual microcontroller I/O pins by sending simple serial commands. USB IO Board is self-powered by USB port and can provide up to 500mA for electronic projects. USB IO Board is breadboard compatible.

ESR Meter / Transistor Tester Kit
Audiophile Headphone Amplifier Kit
ESR Meter / Capacitance / Inductance / Transistor Tester Kit

ESR Meter kit is an amazing multimeter that measures ESR values, capacitance (100pF - 20,000uF), inductance, resistance (0.1 Ohm - 20 MOhm), tests many different types of transistors such as NPN, PNP, FETs, MOSFETs, Thyristors, SCRs, Triacs and many types of diodes. It also analyzes transistor's characteristics such as voltage and gain. It is an irreplaceable tool for troubleshooting and repairing electronic equipment by determining performance and health of electrolytic capacitors. Unlike other ESR Meters that only measure ESR value this one measures capacitor's ESR value as well as its capacitance all at the same time.
Audiophile Headphone Amplifier Kit

Audiophile headphone amplifier kit includes high quality audio grade components such as Burr Brown OPA2134 opamp, ALPS volume control potentiometer, Ti TLE2426 rail splitter, Ultra-Low ESR 220uF/25V Panasonic FM filtering capacitors, High quality WIMA input and decoupling capacitors and Vishay Dale resistors. 8-DIP machined IC socket allows to swap OPA2134 with many other dual opamp chips such as OPA2132, OPA2227, OPA2228, dual OPA132, OPA627, etc. Headphone amplifier is small enough to fit in Altoids tin box, and thanks to low power consumption may be supplied from a single 9V battery.

Arduino Prototype Kit
RF Remote Control 433MHz Four Channel
Arduino Prototype Kit

Arduino Prototype is a spectacular development board fully compatible with Arduino Pro. It's breadboard compatible so it can be plugged into a breadboard for quick prototyping, and it has VCC & GND power pins available on both sides of PCB. It's small, power efficient, yet customizable through onboard 2 x 7 perfboard that can be used for connecting various sensors and connectors. Arduino Prototype uses all standard through-hole components for easy construction, two of which are hidden underneath IC socket. Board features 28-PIN DIP IC socket, user replaceable ATmega328 microcontroller flashed with Arduino bootloader, 16MHz crystal resonator and a reset switch. It has 14 digital input/output pins (0-13) of which 6 can be used as PWM outputs and 6 analog inputs (A0-A5). Arduino sketches are uploaded through any USB-Serial adapter connected to 6-PIN ICSP female header. Board is supplied by 2-5V voltage and may be powered by a battery such as Lithium Ion cell, two AA cells, external power supply or USB power adapter.
200m 4-Channel 433MHz Wireless RF Remote Control

Having the ability to control various appliances inside or outside of your house wirelessly is a huge convenience, and can make your life much easier and fun. RF remote control provides long range of up to 200m / 650ft and can find many uses for controlling different devices, and it works even through the walls. You can control lights, fans, AC system, computer, printer, amplifier, robots, garage door, security systems, motor-driven curtains, motorized window blinds, door locks, sprinklers, motorized projection screens and anything else you can think of.

Electronics-DIY.com © 2002-2024. All Rights Reserved.