Audio card
About the Audio card PCB
Audio card is an open source PCB design by nojan1, published on GitHub. It is a 2-layer board measuring 182.4 × 99.1 mm, with 31 components from 15 distinct parts.
Other key parts include the 74HCT574, 74HCT138 and TL074. By type, the board carries 12 resistors, 8 jumpers, 6 ICs, 2 transistors, 2 connectors and 1 capacitor.
It belongs with the audio designs in this gallery.
From the project
The purpose of Project Wrass is to develop the Wrass 1.
The purpose of Project Wrass is to develop the Wrass 1.
A 6502 based computer having the following specs.
W65C02 running at 2Mhz Bankable RAM giving a total of approx 300KB of usable memory * Expansion bus for up to 16 devices
The 16KB ROM is bankable using an external switch. This allows the computer to run "2 sets" of software.
The existing one is a simple homebrew "monitor" giving access to simple read, write and jump commands.
Main components on the Audio card
Audio card bill of materials (BOM)
31 components, 15 distinct parts.
| Qty | Part | Footprint | Refs |
|---|---|---|---|
| 4 | 74HCT574 | DIP-20_W7.62mm | U2, U4, U5, U6 |
| 1 | 74HCT138 | DIP-16_W10.16mm | U3 |
| 1 | TL074 | DIP-16_W10.16mm | U7 |
| 2 | BC558 | TO-92_Inline | Q1, Q2 |
| 1 | AudioJack2_SwitchT | Jack_3.5mm_PJ320E_Horizontal | J1 |
| 1 | Bus expansion | PinHeader_2x20_P2.54mm_Horizontal | J2 |
| 8 | SolderJumper_2_Open | SolderJumper-2_P1.3mm_Open_RoundedPad1.0x1.5mm | JP1, JP2, JP3, JP4, JP5, JP6, JP7, JP8 |
| 1 | 100nf | C_Radial_D5.0mm_H7.0mm_P2.00mm | C18 |
| 3 | 100k | R_Axial_DIN0207_L6.3mm_D2.5mm_P7.62mm_Horizontal | R1, R2, R3 |
| 1 | 100R | R_Axial_DIN0207_L6.3mm_D2.5mm_P7.62mm_Horizontal | R4 |
| 1 | 200k | R_Axial_DIN0207_L6.3mm_D2.5mm_P7.62mm_Horizontal | R5 |
| 1 | 33k | R_Axial_DIN0207_L6.3mm_D2.5mm_P7.62mm_Horizontal | R6 |
| 3 | 10k | R_Axial_DIN0207_L6.3mm_D2.5mm_P7.62mm_Horizontal | R7, R8, R9 |
| 2 | 470k | R_Axial_DIN0207_L6.3mm_D2.5mm_P7.62mm_Horizontal | R10, R11 |
| 1 | 1k | R_Axial_DIN0207_L6.3mm_D2.5mm_P7.62mm_Horizontal | R12 |
Audio card design files
The KiCad project lives in the nojan1/project-wrass repository on GitHub; these links point at the commit this page was built from.
Audio card: common questions
How big is the Audio card PCB?
The Audio card measures 182.4 × 99.1 mm, has 2 copper layers and is 1.6 mm thick.
How many components are on the Audio card?
31 components, from 15 distinct parts. The full bill of materials is listed on this page.
Where can I download the Audio card design files?
From the nojan1/project-wrass repository on GitHub, which has the KiCad layout and the schematic; the links under Design files point to each one.
Can I use the Audio card design in my own project?
The repository has no license, so all rights stay with nojan1. Use it as a reference, and ask the author before reusing the design.
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