Description:
We’ve created a compact and cost-effective FM radio circuit using the TDA7000 IC, following the specifications in the datasheet, and the results are impressive. It’s a perfect project for electronics enthusiasts of all levels.
The TDA7000 is a monolithic integrated circuit specifically designed for mono FM portable radios, minimizing the need for additional peripheral components. It employs a Frequency-Locked-Loop system with an intermediate frequency of 70 kHz, and active RC filters are employed to achieve intermediate frequency selectivity.
The only aspect that necessitates adjustment is the resonant circuit for the oscillator, which determines the receiving frequency. Additionally, the IC incorporates a mute circuit to prevent spurious reception and filter out excessively noisy input signals. Special precautions are taken to ensure compliance with radiation standards.
Single Chip FM Radio Schematic Circuit Diagram with Parts List:
Notes:
- Wind 5 turns of 0.6 mm enamelled Copper wire on a 4 mm dia plastic former for L1 and L2.
- Use a 50mm long insulated copper wire for the antenna.
- The IC TDA 7000 can handle a supply voltage of up to 10 V.
- However, I recommend 6V.
- At the audio output, use an 8 Ohm speaker or headphones.
PARTS LIST
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 20K or 22K) (trim pot)
C1 – Ceramic cap (see * schematic)
L1 – Adjustable coil for tuning broadcast stations
Resistors
10Ω 1/4W or 1/6W – x 1 pc
22K 1/4W or 1/6W – x 1 pc
Miscellaneous items:
2 ft wire (antenna)
8 Ohm dynamic speaker
9V battery snap
