2 layers229.9 × 93.3 mm
2 layers86.4 × 53.8 mm
Ssr load switch
ethanjamesauto/modular_8bit_computer2- Size
- 86.4 × 53.8 mm
- Copper layers
- 2
- Thickness
- 1.6 mm
- Parts
- 201
- Nets
- 35
- Pads
- 516
- Tracks, vias
- 992, 151
- Pours
- 12
- Routed
- Yes
- KiCad
- KiCad 7 (file 20221018)
- Created
- 18 Aug 2024
- Updated
- 8 Nov 2025
Overview
Ssr load switch is an open-source printed circuit board by ethanjamesauto, from the ethanjamesauto/modular_8bit_computer repository on GitHub. It is a 2-layer board of 86.4 × 53.8 mm with 201 parts on 35 nets, routed with 992 tracks and 151 vias.
It is built around the LM324 and 74LVC1G08Z. Its parts include 116 resistors, 40 diodes, 20 capacitors, 16 ICs and 4 transistors.
Main components
2
LM324
SOP-14-1.5V~10V 0℃~+70℃ 24V 250nA 3V~20V 4 40mA 50nA 700uA 7mV 80dB SOP-14 Operational Amplifier ROHSHXY MOSFETOperational Amplifier
74LVC1G08Z
SOT-553-5-40℃~+125℃ 1 1.65V~5.5V 1.7V、2V 2 2.4V、3.8V 32mA 32mA 4ns@5V,50pF 550mV、800mV 700mV、800mV 74LVC Series AND Gate SOT-553-5 Logic Gates ROHSDiodes IncorporatedLogic Gates
README
README.mdModular 8-bit Computer
This is the repository for an 8-bit computer system that is built using cards with a standardized interface.
- CPU card
- Protoboard card
- This card contains an onboard clock generator, address and data registers/buffers, and a protoboard area for testing designs.
- Bus interface modeling
Here's an example of a card:
Current Bus Specification
// The main bus wires (32+8=40 wires total)
// On the bus connector, all buses have LSBs closer to the power pins and MSBs farther away
wire VCC_5V;
wire GND;
wire clk; // generated by motherboard clock generator
wire rst_n; // probably a button on the motherboard
wire VCC_3V3;
wire we_n; // active LOW
wire oe_n; // active LOW
wire int_n; // pulled up by motherboard; driven down by any peripheral (could be used for interrupts)
wire [7:0] data;
wire [15:0] addr; // 64k address space is suppored by default. More address bits may be added later
wire [7:0] aux_bus;Parts
201| Qty | Value | Footprint | References |
|---|---|---|---|
| 104 | R | Resistor_SMD:R_0603_1608Metric | R1, R1, R1, R1, R10, R10, R10, R10, R11, R11, R11, R11, R12, R12, R12, R12 +88 |
| 32 | LED | LED_SMD:LED_0603_1608Metric | D1, D1, D1, D1, D2, D2, D2, D2, D3, D3, D3, D3, D4, D4, D4, D4 +16 |
| 12 | C | Capacitor_SMD:C_0603_1608Metric | C1, C1, C1, C1, C2, C2, C2, C2, C3, C3, C3, C3 |
| 12 | R | Capacitor_SMD:C_1206_3216Metric | R1_1206, R1_1206, R1_1206, R1_1206, R4_1206, R4_1206, R4_1206, R4_1206, R8_1206, R8_1206, R8_1206, R8_1206 |
| 8 | C | Capacitor_SMD:C_1206_3216Metric | C4_1206, C4_1206, C4_1206, C4_1206, C5_1206, C5_1206, C5_1206, C5_1206 |
| 8 | D | Capacitor_SMD:C_0603_1608Metric | D9, D9, D9, D9, D10, D10, D10, D10 |
| 4 | 2N3904 | Package_TO_SOT_THT:TO-92_Inline | Q1, Q1, Q1, Q1 |
| 4 | 4N25 | Package_DIP:DIP-6_W7.62mm | U1, U1, U1, U1 |
| 4 | 74LVC1G08 | Package_TO_SOT_SMD:SOT-23-6_Handsoldering | U3, U3, U3, U3 |
| 4 | Conn_01x04_Pin | Connector_PinHeader_2.54mm:PinHeader_1x04_P2.54mm_Vertical | J1, J1, J1, J1 |
| 4 | LM324 | Package_DIP:DIP-14_W7.62mm | U4, U4, U4, U4 |
| 4 | LM741 | Package_DIP:DIP-8_W7.62mm | U2, U2, U2, U2 |
| 1 | LOGO | AudioJacks:BOAT | G*** |
Questions
How big is the Ssr load switch PCB?
It measures 86.4 × 53.8 mm and has 2 copper layers, 1.6 mm thick.
What parts does the Ssr load switch use?
201 parts, built around the LM324 and 74LVC1G08Z. 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 Ssr load switch KiCad files?
From the ethanjamesauto/modular_8bit_computer repository on GitHub, at the commit this page was made from: the board is DEFINETELY NOT WORK/aqvssr shit/ssr_load_switch/ssr_load_switch.kicad_pcb. PCBKit opens the board in the browser, with nothing to install.
Can I use the Ssr load switch design in my own project?
Its repository states no licence, so its author keeps all rights: ask ethanjamesauto before reusing the design.
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