fm receiver circuit | Electronic Schematic Diagram https://electronicscheme.net Schematic Diagram & PCB Design Sat, 04 Oct 2014 06:44:09 +0000 en-US hourly 1 https://i0.wp.com/electronicscheme.net/wp-content/uploads/2017/05/cropped-transparent_text_effect.png?fit=32%2C32&ssl=1 fm receiver circuit | Electronic Schematic Diagram https://electronicscheme.net 32 32 129969089 One Transistor FM Receiver https://electronicscheme.net/one-transistor-fm-receiver/?utm_source=rss&utm_medium=rss&utm_campaign=one-transistor-fm-receiver https://electronicscheme.net/one-transistor-fm-receiver/#comments Fri, 12 Mar 2010 00:13:03 +0000 http://electronicscheme.net/?p=418 This is a very simple FM receiver which build based on one transistor only. No chip or another active component. The output is connected to […]

The post One Transistor FM Receiver first appeared on Electronic Schematic Diagram.]]> One Transistor FM Receiver circuit diagram

This is a very simple FM receiver which build based on one transistor only. No chip or another active component. The output is connected to earphones, you need an amplifier circuit if you want to listen the radio with a loudspeaker.

Part designator Part description
C1a,C1b 10 pf, 50 v, ceramic disc capacitor
C2 22 pf, 50 v, ceramic disc capacitor
C3 RF tuning capacitor
C4 330 pf, 50 v, ceramic disc capacitor
C5,C8 0.001 uf, 50 v, ceramic disc capacitor
C6 0.22 uf, 50 v, film capacitor
C7 0.0047 uf, 50 v, ceramic disc capacitor
C9 22 uf, 16 v, electrolytic capacitor
D1 TL431AIZ voltage control Zener (shunt regulator)
EPH1 High impedance earphone
L2 22 uh RF choke
Q1 2N4416A JFET transistor
R1 470K, 1/4 w, resistor
R2, R3 1K, 1/4 w, resistor
R4 10K, 1/4 w, resistor
R5 1M, 1/4 w, resistor
R6 100 ohm, 1/4 w, resistor
S1 Small SPST switch
screws for C3 screws for mounting C3 (2 needed)
nylon screw #4 nylon screw used for tuning C3
battery connector mini battery snap

L1 determine the frequency of the radio, acts as the antenna, and is the primary adjustment for super-regeneration. Although it has many important jobs, it is easy to construct. Get any cylindrical object that is just under 1/2 inch (13 mm) in diameter. A thick pencil or a magic marker or large drill bit work just fine. #20 bare solid wire works the best, but any wire that holds its shape will do. Wind 6 turns tightly, side-by-side, on the cylinder, then slip the wire off. Spread the windings apart from each other so the whole coil is just under an inch (2.5 cm) long. Find the midpoint and solder a small wire for C2 there. Mount the ends of the wire on your circuit board keeping some clearance between the coil and the circuit board.

More instruction how to build this circuit, visit this page

The post One Transistor FM Receiver first appeared on Electronic Schematic Diagram.]]> https://electronicscheme.net/one-transistor-fm-receiver/feed/ 7 418 FM Receiver with TDA7021T https://electronicscheme.net/fm-receiver-with-tda7021t/?utm_source=rss&utm_medium=rss&utm_campaign=fm-receiver-with-tda7021t https://electronicscheme.net/fm-receiver-with-tda7021t/#comments Wed, 20 Jan 2010 06:57:44 +0000 http://electronicscheme.net/?p=384 This is the circuit diagram of mini FM receiver that build based on single FM IC TDA7012T. Components List: R1 = 8k?2 R2 = 10k? […]

The post FM Receiver with TDA7021T first appeared on Electronic Schematic Diagram.]]> This is the circuit diagram of mini FM receiver that build based on single FM IC TDA7012T.

FM Receiver with TDA7012T circuit diagram

Components List:

R1 = 8k?2
R2 = 10k?
R3 = 390?
C1,C3 = 10nF
C2,C6,C9,C16 = 100nF
C4 = 33pF
C5 = 25pF trimmer (Murata type TZB4Z250AB10R00)
C7,C10 = 1nF5
C8 = 820pF		 C11 = 1nF
C12 = 68pF
C13 = 220pF
C14 = 47uF 10V (Nichicon UWX1A470MCL1GB 5.5mmL chip type)
C15 = 3nF3
L1 = 36nH (4 turns 0.5mm silver-plated wire, inside diameter 4mm; length 7mm)
L2 = 1uH, SMD case 0805 (fres > 300 MHz)
IC1 = TDA7021T (SMD in SO16 case)


The TDA7021T integrated radio receiver circuit is for portable radios, stereo as well as mono, where a minimum of periphery is important in terms of small dimensions and low cost. It is fully compatible for applications using the low-voltage micro tuning system (MTS). The IC has a frequency locked loop (FLL) system with an intermediate frequency of 76 kHz. The selectivity is obtained by active RC filters. The only function to be tuned is the resonant frequency of the oscillator. Interstation noise as well as noise from receiving weak signals is reduced by a correlation mute system.

PCB Layout:

FM Receiver with TDA7012T pcb layout

This receiver is a mono implementation, but at the output, the entire multiplexed signal (up to 53 kHz) is available. By using a PLL stereo decoder, such as the TDA7040T, a stereo signal can be generated in a traightforward way from the output signal of the TDA7021T.

Download the TDA7021T datasheet include the schematic diagram how to make this circuit stereo.
[wpdm_file id=55]

FM Receiver with TDA7021T source: http://electroniccircuit-s.blogspot.com/2009/07/mini-fm-receiver-circuit.html

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