fm radio receiver using tda7000

The TDA7000 is a well-known FM radio receiver integrated circuit (IC), also referred to as a one-chip FM radio receiver. It operates within the VHF FM band, covering frequencies from 70 to 120 MHz. Introduced in the 1980s, the TDA7000 has maintained its popularity in the electronics industry for over three decades. Its widespread use is attributed to the integration of complex circuitry required for an FM receiver, including the input RF stage, IF filter stage, local oscillator stage, IF limiter stage, and frequency-locked loop system, all within the IC. This allows for the construction of a high-quality FM radio receiver with minimal external components, achieving a sensitivity of 1.5 µV. The IC also includes a built-in audio amplifier circuit, providing an output of approximately 70 mV, necessitating the use of an additional audio amplifier IC, such as the LM386 or TDA7052, to drive a speaker effectively. Although the manufacturer discontinued the TDA7000 in 2004, it remains available through some electronic distributors, and alternatives such as the TDA7010T, which is a surface-mount version with a 16-pin configuration, can be used as a substitute. The circuit design incorporates two coils, L1 and L2, where L1 consists of six turns of enamelled copper wire of 23 SWG wound closely on a 3 mm diameter air core, and L2 consists of five turns of 23 SWG wire, also wound closely on a 3 mm diameter air core. A small variable capacitor or trimmer should be used in place of VC1, and a telescopic antenna or an 80 cm wire can serve as the antenna. The supply voltage for the circuit can range from 3V to 10V DC, and any suitable audio amplifier IC can be employed to drive a speaker.

The TDA7000 FM receiver IC is designed for simplicity and effectiveness in FM radio applications. The internal architecture allows for the seamless integration of various stages of FM reception, ensuring that the receiver can effectively demodulate FM signals within the specified frequency range. The RF stage captures incoming signals, while the IF filter stage processes these signals to remove unwanted frequencies. The local oscillator stage generates a stable frequency, which is essential for the demodulation process.

The circuit requires minimal external components, which significantly reduces the complexity and size of the overall design. The sensitivity of 1.5 µV is a critical specification, as it determines the receiver's ability to pick up weak signals, making it suitable for use in areas with poor reception. The built-in audio amplifier, although limited to 70 mV output, is sufficient for driving small speakers or headphones when paired with a more powerful external amplifier.

For the coil construction, the choice of wire gauge and the number of turns is crucial for achieving the desired inductance and resonance characteristics. The air core design minimizes losses associated with magnetic cores, enhancing the performance of the receiver. The use of a variable capacitor allows for fine-tuning of the circuit, enabling the user to adjust the receiver to the desired frequency.

The power supply range of 3V to 10V DC provides flexibility in the choice of power sources, making the TDA7000 suitable for battery-operated devices. The inclusion of alternative audio amplifier ICs enables designers to customize the audio output stage according to their specific requirements, further enhancing the versatility of the TDA7000 in various applications, from hobbyist projects to commercial products.TDA7000 is a famous FM radio receiver IC also called one chip FM radio receiver covers VHF FM band from 70 to 120 MHZ. This IC was first introduced in 1980`s and gained very popularity in the electronics world and it is still very popular after 31 years.

The main reason of its popularity is that all the complicated circuitry of an FM receiver like input RF stage, IF filter stage, local oscillator stage, IF limiter stage, Frequency locked loop system etc. has been built in side the IC therefore the IC require only few external components to make a good quality FM radio reciever with the sensitivity of 1.

5uV. The IC also contain a small built in audio amplifier circuit but its output is around 70mV due to which a small audio amplifier IC can be used at the output of the IC like LM386 or TDA7052 etc. Although the IC has been discontinued by the manufacturer in 2004 but it is still in stock of some electronic distributors so you have to search it online or at your local electronic market if you require one.

If you cant find the IC then you can also use its other substitute which is TDA7010T. The internal circuit of this IC is almost similar to TDA7000 only the difference is that TDA7010T is a surface mount version (SMD) and comes in 16 pin. The circuit mentioned here is using two coils L1 and L2. L1 is equal to 6 turns of enamelled copper wire of 23 SWG close wound on 3mm diamater air core. and L2 is equal to 5 turns of 23 SWG wire close wound on 3mm diameter form air core. Use small variable capacitor or trimmer in the place of VC1. Use telescopic antenna or 80cm wire as an antenna. The supply voltage can be between 3V to 10V DC. You can also use any audio amplifier IC with the circuit to drive a speaker. 🔗 External reference