GS1299 circuit FM stereo radio tuner

GS1299 circuit FM stereo radio tuner

GS1299 circuit FM stereo radio tuner. Don’t miss out on the opportunity to build your own GS1299 circuit FM stereo radio tuner! Purchase the DIY kit now and enjoy the convenience of a fully integrated synthesizer, IF selectivity, and MPX decoder. Experience optimum sound quality with varying reception conditions and tune in to the worldwide frequency band. Get your hands on this amazing project and start building today!

Schematic GS1299 circuit FM stereo radio tuner


A radio is an electronic device that can receive, decode, and convert radio signals into audio signals. An FM radio is a radio that receives FM (frequency modulation) radio signals. The circuit uses the GS1299 chip as the core, with a power module consisting of a battery size and a voltage regulator chip. The 3.5 mm headphone jack serves as both the signal reception end and the output end for audio signals. A surface-mount crystal oscillator provides the clock signal, and control signals are input via 5 touch buttons.

Circuit Fm Stereo Radio Tuner Datasheet Block

The GS1299 chip is a special stereo receiver chip produced by a Chinese company, which does not require users to write programs.

Circuit Fm Stereo Radio Tuner Datasheet

Two AA batteries are connected to battery holder BT1 to provide a 3V input voltage (VCC_BAT). This voltage is controlled by toggle switch SW6 and is regulated by the PL3500 voltage regulator chip to generate the supply voltage for the chip circuit (VCC). Resistor R2 and diode D1 form an indication circuit to check if the power supply is normal.

Battery Holder Structure And Logic Package Design

Buttons SW1~SW5 are connected to different function pins of the GS1299 chip, serving as power on/off, volume up, volume down, next channel, and previous channel control terminals. SW1 is stabilized by resistor R1 and capacitor C1 to avoid interference. The project uses silicone rebound buttons for better touch sensitivity, where pressing the button connects the circuit, and releasing it automatically returns to the unpressed state.

Double-Foot Patch-Type Silicone Touch Rebound Button

The supply voltage (VCC) is filtered through capacitors C4 and C5 before being sent to pins 6 and 10 of the GS1299 chip to provide power supply voltage. Crystal oscillator Y1 (32.768kHz) and the chip’s phase-locked loop circuit work together to generate the required clock signal for the chip to operate.

Various Types Of Crystal Oscillators

The GS1299 chip uses the headphone wire as an antenna, and when the headphone wire is connected to the 3.5 mm headphone jack (J1), the FM signal is filtered through L3 and C6 before being input to pin 4 of the chip. The GS1299 chip will automatically decode, A/D convert, amplify the FM signal, and then output the stereo left and right channel signals through C2, C3, L1, and L2 after eliminating RF interference, to the headphone jack.

Pj-313 Headphone Jack Physical Picture And Logic Package Design

J2, J3, J4 are three screw holes connected to the “ground” network.

About IC GS1299

The GS1299 is a single-chip broadcast FM stereo radio tuner with fully integrated synthesizer, IF selectivity and MPX decoder. The tuner uses the CMOS process, require the least external component. The package size is SOP16 and is completely adjustment-free. All these make it very suitable for portable devices. The GS1299 has a powerful low-IF digital audio processor, this make it have optimum sound quality with varying reception conditions. The GS1299 can be tuned to the worldwide frequency band.

BOM GS1299 circuit FM stereo radio tuner

Parts Value Description Quantity
C1 22nF/10v/C0603 C0603 — SMD ceramic capacitor 1
C2,C3 47uF/B CAP-SMD_L3.5-W2.8 2
C4 22uF/10v/A CAP-SMD_L3.2-W1.6 1
C5 0.1uF/10v/C0603 C0603 — SMD ceramic capacitor 1
C6 24pF/10v/C0603 C0603 — SMD ceramic capacitor 1
R1 1K/1%/R0603 R0603 — SMD Resistor 1
R2 10K/1%/R0603 R0603 — SMD Resistor 1
D1 GREEN/0805 LED0805 — SMD Green LED 1
U1 GS1299 SOP-16 — single-chip broadcast FM stereo
radio tuner
U2 PL3500-3.3v or XC6206P332MR (662k) SOT-23 3.3V voltage regulator 1
BT1 BH-AAA-A1AJ020 Battery Connector 1
J1 PJ-3135-B 3.5 mm headphone jack 1
J2,J3,J4 M3x10+6Cu M3 3
L1,L2 1uH/L1206 L1206 — SMD Inductor 2
L3 100nH/L0603 L0603 — SMD Inductor 1
SW1,SW2,SW3,SW4,SW5 SPEH110100 SMD,6×6 mm Push Switch 5
SW6 SS-12F23 SPDT Slide Switch 1
Y1 32.768kHz/FC-135 32.768kHz SMD3215-2P Crystal 1

Download files, links, and notes

Pcb 3D Top
Pcb 3D Bottom


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About the author blog author. Electronics technician for the technical school of Brasilia - Brazil. Interested in electronics, circuits and technology in general.

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