Psu
About the Psu PCB
Psu is an open source PCB design by eshazen, published on GitHub. It is a 2-layer board measuring 127 × 50.8 mm, with 25 components from 14 distinct parts.
Other key parts include the BOOST and BUCK. By type, the board carries 8 resistors, 6 transistors, 4 connectors, 2 ICs, 2 diodes and 2 capacitors.
It belongs with the retro computing and displays & leds designs in this gallery.
From the project
Retro-tech HP-25 calculator clone using Z80
This is branch "ScopeClock". Building up another CPU board for used as a general purpose computer for the scope clock, along with the DAC/Interface board from that project, which (whew!) has an actual UART for the serial port.
Time for something new! The VFD HP-25 is cool and all, but I've lusted after an HP-97 most of my life, plus I love nixie tubes! Starting to think about a nixie-display HP-97 emulator. Probably no card reader, but a small printer is certainly doable. Inspiration from Oliver De Smet (archived elswhere in this repository just in case):
Main components on the Psu
Psu bill of materials (BOM)
25 components, 14 distinct parts.
| Qty | Part | Footprint | Refs |
|---|---|---|---|
| 1 | BOOST | ebay_XL6009 | U1 |
| 1 | BUCK | ebay_buck | U2 |
| 2 | 2N3904 | TO-92_Inline | Q1, Q2 |
| 2 | 2N3906 | TO-92_Inline | Q3, Q4 |
| 2 | IRF540N | TO-220-3_Vertical | Q5, Q6 |
| 2 | Conn_01x02_Male | Molex_KK-396_A-41791-0002_1x02_P3.96mm_Vertical | J1, J4 |
| 1 | Conn_01x04_Male | PinHeader_1x04_P2.54mm_Vertical | J2 |
| 1 | Conn_01x06_Male | Molex_KK-396_A-41791-0006_1x06_P3.96mm_Vertical | J3 |
| 1 | SW_SPST | Molex_KK-396_A-41791-0002_1x02_P3.96mm_Vertical | SW1 |
| 2 | LED | LED_D3.0mm | D1, D2 |
| 2 | 0.1uF | C_Disc_D3.8mm_W2.6mm_P2.50mm | C1, C2 |
| 6 | R_US | R_Axial_DIN0207_L6.3mm_D2.5mm_P10.16mm_Horizontal | R1, R2, R3, R4, R5, R6 |
| 1 | 2.5k | R_Axial_DIN0207_L6.3mm_D2.5mm_P10.16mm_Horizontal | R7 |
| 1 | 150 | R_Axial_DIN0207_L6.3mm_D2.5mm_P10.16mm_Horizontal | R8 |
Psu design files
The KiCad project lives in the eshazen/retro-25 repository on GitHub; these links point at the commit this page was built from.
Psu: common questions
How big is the Psu PCB?
The Psu measures 127 × 50.8 mm, has 2 copper layers and is 1.6 mm thick.
How many components are on the Psu?
25 components, from 14 distinct parts. The full bill of materials is listed on this page.
Where can I download the Psu design files?
From the eshazen/retro-25 repository on GitHub, which has the KiCad layout; the links under Design files point to each one.
Can I use the Psu design in my own project?
The repository has no license, so all rights stay with eshazen. Use it as a reference, and ask the author before reusing the design.
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