2 layers208 × 110 mm
2 layers114 × 130 mm
Aymbedded
ladmanj/aymbedded1PCB for embed the AY-3-8910 and class-D amplifier into the ZX Spectrum+ case 2023/2024 Jakub Ladman (ladmanj at volny cz)
- Size
- 114 × 130 mm
- Copper layers
- 2
- Thickness
- 1.6 mm
- Parts
- 40
- Nets
- 92
- Pads
- 256
- Tracks, vias
- 516, 67
- Pours
- 3
- Routed
- Yes
- KiCad
- KiCad 7 (file 20221018)
- Created
- 26 Jan 2024
- Updated
- 1 Feb 2024
Overview
Aymbedded is an open-source printed circuit board by ladmanj, from the ladmanj/aymbedded repository on GitHub. It is a 2-layer board of 114 × 130 mm with 40 parts on 92 nets, routed with 516 tracks and 67 vias.
It is built around the MAX3232ID, 74HC74D and 74HC132D, with the 74HC138 among its other parts. Its parts include 18 capacitors, 9 ICs, 7 resistors and 4 connectors.
Main components
4
MAX3232ID
SOIC-16-40℃~+85℃ 2 2 250Kbps 300uA 3V~5.5V Short-Circuit Protection Transceiver Yes ±15kV SOIC-16 RS232 ICs ROHSTexas InstrumentsRS232 ICs
74HC74D
SOIC-14-40℃~+125℃ 1 15ns 2 2V~6V 3.5pF 37ns@6V,50pF 3ns、3ns、3ns 40uA 5.2mA 5.2mA 74HC Series 82MHz Asynchronous Complementary D-Type Rising Edge Set and Reset SOIC-14 Flip Flops ROHSNexperiaFlip Flops74HC132D
SO-14-40℃~+125℃ 1.5V~4.2V 2 21ns@6V,50pF 2V~6V 2uA 3.7V~4.5V、5.2V~6V 300mV~1.2V 4 400mV 5.2mA 5.2mA 74HC Series NAND Gate Schmitt trigger SOIC-14 Logic Gates ROHSNexperiaSpecialty Logic74HC138
SOP-160℃~+70℃ 24ns@5.0V,16pF 2V~6V 3/8 5.2mA 5.2mA 5uA 74HC Decoder Reverse function Single Supply SOP-16 Signal Switches, Multiplexers, Decoders ROHSGRSignal Switches, Multiplexers, Decoders
README
README.mdPCB for embed the AY-3-8910 and class-D amplifier into the ZX Spectrum+ case 2023/2024 Jakub Ladman (ladmanj at volny cz)
For years I had a wire nest with a piece of protoboard for my AY-3-8910 (actually YM2149) that was very flimsy and prone to damage. Last Christmas break I drew the PCB to put everything in the computer case. The three PSG channels are mixed with the output of the SPKR ULA and the resulting signal is amplified by a class-D amplifier and sent to a reasonable quality loudspeaker.
All IOs used in the ZXS128k for serial ports are equipped with RS232 transceivers. The second IO port is connected directly to the optional connector. These IO ports are not yet tested.
The PCB is soldered directly on the underside of the ZX Spectrum motherboard to the CPU pins. The images are in the connection_instructions folder.
License: Do what you want. My support will be very limited, but feel free to ask me anything.
I have four blank PCBs. The first four of you can basically have it for the cost of shipping. Please contact me if you are interested.
Parts
40| Qty | Value | Footprint | References |
|---|---|---|---|
| 10 | 100n | Capacitor_SMD:C_0603_1608Metric | C7, C8, C9, C11, C12, C13, C14, C16, C17, C18 |
| 8 | 1uF | Capacitor_SMD:C_0603_1608Metric | C1, C2, C3, C4, C5, C6, C10, C15 |
| 5 | 300k | Resistor_SMD:R_0603_1608Metric | R1, R2, R5, R6, R7 |
| 2 | 74HC74 | Package_SO:SO-14_3.9x8.65mm_P1.27mm | U2, U4 |
| 2 | Conn_01x02_Pin | Connector_PinHeader_2.54mm:PinHeader_1x02_P2.54mm_Vertical | J3, J4 |
| 2 | MAX3232 | Package_SO:SO-16_3.9x9.9mm_P1.27mm | U7, U8 |
| 1 | 10k | Potentiometer_THT:Potentiometer_Bourns_3299Z_Horizontal | RV1 |
| 1 | 1k | Resistor_SMD:R_0603_1608Metric | R3 |
| 1 | 22R | Resistor_SMD:R_0603_1608Metric | R4 |
| 1 | 74HC132 | Package_SO:SO-14_3.9x8.65mm_P1.27mm | U5 |
| 1 | 74HC138 | Package_SO:SO-16_3.9x9.9mm_P1.27mm | U3 |
| 1 | AY-3-8910 (YM2149) | Package_DIP:DIP-40_W15.24mm | U6 |
| 1 | DE9_Plug | Connector_Dsub:DSUB-9_Male_Horizontal_P2.77x2.54mm_EdgePinOffset9.40mm | J1 |
| 1 | DE9_Receptacle | Connector_Dsub:DSUB-9_Female_Horizontal_P2.77x2.54mm_EdgePinOffset9.40mm | J2 |
| 1 | PAM8304ASR (CS8305E) | Package_SO:Diodes_SO-8EP | IC1 |
| 1 | Speaker | Connector_PinHeader_2.54mm:PinHeader_1x02_P2.54mm_Vertical | LS1 |
| 1 | jen motiv na desce | Package_DIP:DIP-40_W15.24mm | U1 |
Questions
How big is the Aymbedded PCB?
It measures 114 × 130 mm and has 2 copper layers, 1.6 mm thick.
What parts does the Aymbedded use?
40 parts, built around the MAX3232ID, 74HC74D, 74HC132D and 74HC138. 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.
Where can I download the Aymbedded KiCad files?
From the ladmanj/aymbedded repository on GitHub, at the commit this page was made from: the board is aymbedded.kicad_pcb and its schematic aymbedded.kicad_sch. PCBKit opens the board in the browser, with nothing to install.
Can I use the Aymbedded design in my own project?
Its repository states no licence, so its author keeps all rights: ask ladmanj before reusing the design.
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