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The Elektor DSP radio (1)

DSP world receiver with USB interface

The Elektor DSP radio (1)
The Elektor DSP radio (1)
Many radio amateurs in practice use two receivers, one portable and the other a fixed receiver with a PC control facility. The Elektor DSP radio can operate in either capacity, with a USB interface giving the option of PC control. An additional feature of the USB interface is that it can be used as the source of power for the receiver, the audio output being connected to the PC’s powered speakers. To allow portable 6 V battery operation the circuit also provides for an audio amplifier with one or two loudspeakers.

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Matériaux

Fichier Gerber

Le circuit imprimé de cet article est disponible sous forme d’un ou plusieurs fichiers Gerber. Seuls les membres de la communauté d’Elektor peuvent télécharger gratuitement ce(s) fichier(s). Avec ce(s) fichier(s), vous pouvez réaliser vous-même le circuit imprimé ou bien le faire faire.

Si vous souhaitez passer par un service en ligne, nous vous recommandons notre partenaire Eurocircuits. Nous faisons régulièrement appel à Eurocircuits pour nos prototypes et notre production en série.

L’utilisation de nos fichiers Gerber est protégée par une licence Creative Commons modifiée. Creative Commons offre aux auteurs, scientifiques, enseignants et autres créateurs la liberté de gérer avec souplesse leurs droits d’auteur, sans perdre leurs droits réservés.

PCB

Info supplémentaire / Mise à jour

Features
- no set-up adjustments required
- Si4735 DSP receiver IC
- ATmega168 microcontroller
- USB interface using FT232R
- backlit 2 x 16 LCD panel
- battery voltage 4.8 to 6 V
- current consumption approximately 50 mA
- 3.3 V internal power supply
- power from PC over USB interface
- stereo audio output
- stereo audio amplifier (2 x LM386)
- RDS display
- AM from 153 kHz to 21.85 MHz
- automatic station search
- antenna signal strength indication in dBµV
- signal strength meter connection
- diode switching of AM band
- automatic tuning of AM resonant circuit
- switchable AM bandwidth
- optional PC control over USB
- tuning using rotary encoder
- four control pushbuttons
- station memory (30 AM presets and 30 FM presets)
- open-source firmware (free download)
- in-system programming interface
- printed circuit board available ready-populated and tested

Composants

La nomenclature (BOM, Bill of Materials) fournie par Elektor est une liste aussi complète que possible de fournisseurs pour les projets du labo d’Elektor. Elle est plus détaillée que la liste publiée dans le magazine. En outre, elle est mise à jour si nécessaire.
En tant que lecteur, vous pouvez télécharger cette nomenclature ici.

Télécharger la liste de composants

Liste des composants

Resistors
(5%, 0.25 W)
R1-R3 = 100Ohm
R4,R5 = 470Ohm
R6-R8 = 22kOhm
R9,R10 = 1kOhm
R11 = 47Ohm
R12,R13 = 10Ohm
P1 = 10kOhm trimpot, linear, vertical adjustment, PCB mount, ALPS type RK09K11310KB (Farnell # 1191725)

Capacitors
C1,C23,C24,C26,C27 = 1uF 16V, electrolytic, radial, 5mm diameter
C2, C3 = 4.7uF 16V, electrolytic, radial, 5mm diameter
C4-C16 = 100nF, ceramic capacitor, 2.54 mm lead pitch
C17, C18 = 47pF, ceramic capacitor, NP0, 5.08mm lead pitch
C19, C20 = 22pF, ceramic capacitor, NP0, 5.08mm lead pitch
C21, C22 = 12pF, ceramic capacitor, NP0, 5.08mm lead pitch
C25 = 100uF 16V, electrolytic, radial, 6.3mm diameter
C28, C29 = 47uF 16 V, electrolytic, radial, 6.3mm diameter
C30, C31 = 470uF 16 V, electrolytic, radial, 8.0mm diameter
C32, C33 = 100nF, polyester (MKT), 5.08 mm lead pitch

Inductors
L1 = 10uH (Fine Inductors Fastron type SMCC-100X-YY)
L2 = 0.1uH (Fine Inductors Fastron type SMCC-R10X-YY)
L3 = 4.7uH (Fine Inductors Fastron type SMCC-4R7X-YY)
L4 = 220uH (Fine Inductors Fastron type SMCC-221X-YY)
L5 = 2.2mH (Fine Inductors Fastron type SMCC-222X-YY)

Semiconductors
D1-D5 = BAT48, Schottky diode, 330 mW, DO-35
D6,D7 = 1N4148
IC1 = LP2950ACZ-3.3/NOPB, LDO voltage regulator, 3.3 V, 100 mA, TO-92
IC2 = FT232RL, USB to serial UART interface, FTDI, SSOP-28
IC3 = ATmega168PA-PU, PDIP-28, programmed, Elektor # 100126-41)
IC4, IC5 = LM386N-1, DIL-8
Y1 = Si4735 broadcast AM/FM/SW/LW radio receiver carrier board, DIL-20, Elektor # 090740-71

Miscellaneous
ENC1 = Rotary encoder, vertical, 12 ppr, ALPS type EC12E1220401 (Farnell # 1520809)
JP1 = 3-way pinheader, 2.54 mm lead pitch + jumper
JP2-JP5 = 2-way pinheader, 2.54 mm lead pitch + jumper
K1-K3 = 2-way, screw-type terminal block, 5mm lead pitch
K4 = BNC connector 50 ohms, black, PCB, mount, Tyco Electronics type 1-1634612-0 (right angle);
type 1-1634505-0 (vertical) (Farnell # 1020957; # 1020960)
K5 = 3-way PCB terminal block, 5mm lead pitch
K6 = jack socket, 3.5mm, stereo (Farnell # 1267400)
K7 = USB socket type B, PCB mount
K8 = 6-way (2x3) header, wire-to-board (Farnell # 1096984)
LCD1 = Alphanumeric LCD 2x16, (Electronic Assembly type EA DOGM162W-A) + LED blue backlight (type EA LED55X31-B)
S1 = slide switch, SPDT, C&K type OS102011MS2QN1 (Farnell # 1201430)
S2-S5 = Tactile switch, SPNO, MULTIMEC type 3FTL6 (Farnell # 1132885) + elevation caps
X1 = 8MHz quartz crystal, low-profile, case type HC49
X2 = 32.768 kHz quartz crystal, cylindrical case (3x8 mm)
2 pcs IC socket, DIL-8
1 pc IC socket, DIL-28 narrow body
Sockets for LCD elevation
PCB, bare, Elektor # 100126-1
PCB ready assembled and tested, Elektor # 100126-91

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