shabaz123/simple_dcr1Simple Direct Conversion Receiver for 40m (7 MHz) Band
Soldersmoke dcr pcbversion is an open-source printed circuit board by shabaz123, from the shabaz123/simple_dcr repository on GitHub. It is a 2-layer board of 160 × 100 mm with 113 parts on 36 nets, routed with 359 tracks and 24 vias.
It is built around the BZX55C8V2. Its parts include 23 capacitors, 19 resistors, 17 connectors, 5 diodes and 5 transistors.
This project is based on https://hackaday.io/project/190327/files
The main difference is that the project has been converted to a printed circuit board layout.
To order a PCB, Click here for the PCB Gerber Zip File and then upload it to any PCB manufacturer. The board is 2-layer, 160 x 100 mm in size.
The 3D-print file for constructing the variable inductor is available from the Hackaday website (direct link to the file).
The parts list is in a table further below.
Click here for the PDF version
T50-6 Iron Powder
Pins 1-2: 26 Turns
Pins 6-4: 5 Turns
FT50-43 Ferrite
10 Turns Trifilar
Three Windings: Red, Green, Blue
Pin 4: Red end A
Pin 6: Red end B
Pin 1: Green end A
Pin 3: Blue end B
Pin 2: Remaining ends (Green end B, Blue end A)
| Reference | Value | Qty | Description |
|---|---|---|---|
| C1,C2 | 2 x 330pF in Parallel | 4 | NP0 Ceramic Capacitors (660pF combined) |
| C3 | 130p | 1 | NP0 Ceramic Capacitor |
| C4,C5,C6,C7 | 0.1u | 4 | Ceramic Capacitor |
| C8,C14 | 10u | 2 | Electrolytic Capacitor |
| C9,C11,C13 | 470u | 3 | Electrolytic Capacitor |
| C10,C12,C15 | 47u | 2 | Electrolytic Capacitor |
| C16 | 0.47u | 1 | Ceramic Capacitor |
| C17 | 33u | 1 | Electrolytic Capacitor |
| C18,C19 | 2 x 330pF in Series | 4 | NP0 Ceramic Capacitors (165pF combined) |
| C20 | 10p | 1 | NP0 Ceramic Capacitor |
| C21,C22,C23 | Optional | 3 | 40pF Trimmer Capacitors |
| D1 | BZX55C8V2 | 1 | Zener Diode 8.2V |
| D2,D3,D4,D5 | 1N5819 | 4 | Schottky Diode |
| J1 | Antenna | 1 | 3.5mm or 3.8mm 2-way Screw Terminal Block |
| J2 | Speaker | 1 | 8 ohm Speaker |
| J3 | 9V Battery | 1 | PP3 Battery Connector |
| L1 | Variable Inductor | 1 | 19 Turns on 3D-printed Former |
| L2 | 10u | 1 | Axial Inductor |
| L11 | 100uH | 1 | Axial Inductor |
| Q1,Q3,Q4,Q5 | 2N3904 | 4 | NPN Transistor |
| Q2 | J310 | 1 | N-ch JFET |
| R1,R2 | 10k | 2 | Resistor |
| R3 | 3.3k | 1 | Resistor |
| R4,R6,R14 | 100R | 3 | Resistor |
| R5 | 100k | 1 | Resistor |
| R7 | 47R | 1 | Resistor |
| R8,R12,R16 | 15k | 3 | Resistor |
| R9,R13,R17 | 4.7k | 3 | Resistor |
| R10,R18 | 1k | 2 | Resistor |
| R11,R19 | 470R | 2 | Resistor |
| R20 | 220R | 1 | Resistor |
| SW1 | SPDT | 1 | Right-Angle SPDT Toggle Switch |
| TR1,TR2 | T50-6 | 2 | Toroid Iron Powder Type 6 |
| TR3,TR4 | FT50-43 | 2 | Toroid Ferrite Type 43 |
| TR5 | Transformer 1k/8R | 1 | Audio Transformer 1kohm:8ohm |
| VR1 | 1k | 1 | Potentiometer Log Audio (Type A) |
| n/a | Former | 1 | 3D-printed Coil Former for Inductor |
| n/a | M6 Bolt BRASS | 1 | M6 75 or 80 mm Screw MUST be SOLID BRASS |
| n/a | M6 Nut | 1 | M6 Nut Ideally Brass |
| n/a | Enamelled Wire | 1 | Approx 24-26 AWG Enamelled Wire |
| Qty | Value | Footprint | References |
|---|---|---|---|
| 14 | ~ | User_Global_Library:PinHeader_1x02_P2.54mm_Vertical | J4, J5, J6, J7, J8, J9, J10, J11, J12, J13, J14, J15, J16, J17 |
| 12 | LOGO | LOGO | G***, G***, G***, G***, G***, G***, G***, G***, G***, G***, G***, G*** |
| 10 | ~ | User_Global_Library:mousebites-imperial-5-trackgap | H1, H2, H4, H5, H8, H10, H12, H13, H16, H20 |
| 9 | ~ | User_Global_Library:mousebites-imperial-5 | H3, H6, H7, H9, H11, H14, H15, H19, H22 |
| 4 | 0.1u | User_Global_Library:C_Disc_D3.0mm_W1.6mm_P5.0 | C4, C5, C6, C7 |
| 4 | 1N5819 | User_Global_Library:D_DO-41_SOD81_P10.16mm_Horizontal_soldersmoke | D2, D3, D4, D5 |
| 4 | 2N3904 | User_Global_Library:TO-92-soldersmoke | Q1, Q3, Q4, Q5 |
| 3 | 100R | Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P10.16mm_Horizontal | R4, R6, R14 |
| 3 | 15k | Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P10.16mm_Horizontal | R8, R12, R16 |
| 3 | 4.7k | Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P10.16mm_Horizontal | R9, R13, R17 |
| 3 | 470u | User_Global_Library:CP_Radial_D8mm_P3.5mm | C9, C11, C13 |
| 3 | M3 | MountingHole:MountingHole_3.2mm_M3_Pad | H17, H18, H21 |
| 3 | Optional | User_Global_Library:C_Trim_Multisized | C21, C22, C23 |
| 2 | 10k | Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P10.16mm_Horizontal | R1, R2 |
| 2 | 10u | User_Global_Library:CP_Radial_D5.0mm_P2.50mm | C8, C14 |
| 2 | 165p | User_Global_Library:C_Disc_Series_plus_1206_SMD_D3.0mm_W1.6mm_P5.0 | C18, C19 |
| 2 | 1k | Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P10.16mm_Horizontal | R10, R18 |
| 2 | 470R | Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P10.16mm_Horizontal | R11, R19 |
| 2 | 47u | User_Global_Library:CP_Radial_D6.3mm_P2.50mm | C10, C15 |
| 2 | 660p | User_Global_Library:C_Disc_Parallel_plus_1206_SMD_D3.0mm_W1.6mm_P5.0 | C1, C2 |
| 2 | FT50-43 Ferrite | User_Global_Library:soldersmoke-toroid-CT-12.7 | TR3, TR4 |
| 2 | T50-6 Iron | User_Global_Library:soldersmoke-toroid-ferrite-12.7 | TR1, TR2 |
| 1 | 0.47u | User_Global_Library:C_Disc_D3.0mm_W1.6mm_P5.0 | C16 |
| 1 | 100k | Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P10.16mm_Horizontal | R5 |
| 1 | 100uH | Inductor_THT:L_Axial_L9.5mm_D4.0mm_P12.70mm_Horizontal_Fastron_SMCC | L11 |
| 1 | 10p | User_Global_Library:C_Disc_D3.0mm_W1.6mm_P5.0 | C20 |
| 1 | 10u | Inductor_THT:L_Axial_L9.5mm_D4.0mm_P12.70mm_Horizontal_Fastron_SMCC | L2 |
| 1 | 130p | User_Global_Library:C_Disc_D3.0mm_W1.6mm_P5.0 | C3 |
| 1 | 19 Turns | User_Global_Library:variable-inductor-soldersmoke | L1 |
| 1 | 1k | User_Global_Library:Potentiometer_soldersmoke | VR1 |
| 1 | 220R | Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P10.16mm_Horizontal | R20 |
| 1 | 3.3k | Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P10.16mm_Horizontal | R3 |
| 1 | 33u | User_Global_Library:CP_Radial_D5.0mm_P2.50mm | C17 |
| 1 | 47R | Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P10.16mm_Horizontal | R7 |
| 1 | 47u | User_Global_Library:CP_Radial_D5.0mm_P2.50mm | C12 |
| 1 | 9V Battery | User_Global_Library:TerminalBlock_2way-3.5-3.81mm | J3 |
| 1 | Antenna | User_Global_Library:TerminalBlock_2way-3.5-3.81mm | J1 |
| 1 | Audio 1k/8R | User_Global_Library:soldersmoke-audio-transformer | TR5 |
| 1 | BZX55C8V2 | Diode_THT:D_DO-35_SOD27_P7.62mm_Horizontal | D1 |
| 1 | J310 | User_Global_Library:TO-92-JFET-soldersmoke | Q2 |
| 1 | On/Off Toggle | User_Global_Library:SPDT-RA | SW1 |
| 1 | Speaker | User_Global_Library:TerminalBlock_2way-3.5-3.81mm | J2 |
It measures 160 × 100 mm and has 2 copper layers, 1.6 mm thick.
113 parts, built around the BZX55C8V2. The full list of its parts is on this page, with links to each part's symbol and footprint where PCBKit's library has them.
From the shabaz123/simple_dcr repository on GitHub, at the commit this page was made from: the board is soldersmoke-dcr-pcbversion.kicad_pcb and its schematic soldersmoke-dcr-pcbversion.kicad_sch. PCBKit opens the board in the browser, with nothing to install.
Its repository states no licence, so its author keeps all rights: ask shabaz123 before reusing the design.
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