gardners/pmod-composite5PMOD composite output board for FPGAs
Pmod composite is an open-source printed circuit board by gardners, from the gardners/pmod-composite repository on GitHub. It is a 2-layer board of 37.1 × 67.1 mm with 40 parts on 28 nets, routed with 115 tracks and 1 via.
It is built around the NE5532 and PJRAN1X1U04X. Its parts include 14 resistors, 12 capacitors, 6 inductors, 3 connectors and 1 IC. It belongs with the fPGA and programmable logic boards of this library.
Designed for use with FPGA boards used as DIY MEGA65 machines.
The DAC uses 4 FPGA pins per channel. It is designed for the FPGA to massively over-sample the outputs to obtain 4 bits of precision per FPGA line. Thus 16 bit precision per line should be possible. Most of the components on the board are the filter to smooth out the switching noise from driving the pins at 540MHz (270MHz DDR) to produce a nice clean 13.5MHz clocked composite signal. Should work fine as an audio DAC, too.
Design is all hole-through for easy assembly at home.
| Qty | Value | Footprint | References |
|---|---|---|---|
| 4 | 1.8u | Inductor_THT:L_Axial_L5.3mm_D2.2mm_P10.16mm_Horizontal_Vishay_IM-1 | L1, L2, L5, L6 |
| 4 | 270p | Capacitor_THT:C_Disc_D5.0mm_W2.5mm_P2.50mm | C3, C4, C9, C10 |
| 4 | 470p | Capacitor_THT:C_Disc_D5.0mm_W2.5mm_P2.50mm | C5, C6, C7, C8 |
| 4 | 6K8R | Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P7.62mm_Horizontal | R9, R10, R11, R12 |
| 4 | MountingHole_Pad | MountingHole:MountingHole_3.2mm_M3_DIN965_Pad | H1, H2, H3, H4 |
| 2 | 100p | Capacitor_THT:C_Disc_D5.0mm_W2.5mm_P2.50mm | C1, C2 |
| 2 | 10u | Capacitor_THT:C_Disc_D3.0mm_W2.0mm_P2.50mm | C11, C12 |
| 2 | 2.2u | Inductor_THT:L_Axial_L5.3mm_D2.2mm_P10.16mm_Horizontal_Vishay_IM-1 | L3, L4 |
| 2 | 200K | Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P7.62mm_Horizontal | R4, R8 |
| 2 | 24K9 | Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P7.62mm_Horizontal | R3, R7 |
| 2 | 390R | Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P7.62mm_Horizontal | R1, R5 |
| 2 | 3K09 | Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P7.62mm_Horizontal | R2, R6 |
| 2 | 75R | Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P7.62mm_Horizontal | R13, R14 |
| 2 | PJRAN1X1U04X | 00Project:SWITCHCRAFT_PJRAN1X1U04X | J2, J3 |
| 1 | Conn_02x06_Top_Bottom | Connector_PinHeader_2.54mm:PinHeader_2x06_P2.54mm_Vertical | J1 |
| 1 | NE5532 | Package_DIP:DIP-8_W7.62mm | U1 |
It measures 37.1 × 67.1 mm and has 2 copper layers, 1.6 mm thick.
40 parts, built around the NE5532 and PJRAN1X1U04X. 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 gardners/pmod-composite repository on GitHub, at the commit this page was made from: the board is pmod-composite/pmod-composite.kicad_pcb and its schematic pmod-composite/pmod-composite.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 gardners before reusing the design.
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