A interposer for 3.3V 486 for using on motherboard without 3.3V regulator. A advantage of this 486VRM interposer: switching regulator instead linear regulator.
- 000 initial draft
- 001 smaller pcb size, current limit resistor added for Intel DX4 I/O buffer (pin J1), added solder help
- Vcore can be adjusting with jumper: 3.3V, 3.45 and 4V
- Clock-Multi jumper (for some DX4 and AMD/Cyrix 5x86)
- Writeback L1 jumper
- connector for fan, 5V
- I use "BGA"-technologie on this interposer.
- using of solder paste is very recommend.
- you need solder iron with long and small chisel for extra adding of tin to socket.
- "solder helper hold pin (bottom) on their place.
- very recommend: solder only one row with pin to pcb, then second row, then third row.
[
| Footprint | Count | Value | Supplier | Order-number |
|---|---|---|---|---|
| Top1 | 1 | 486 | various | PGA-168 486 168pin socket |
| Bot1 | 1 | 486 | various | turned pin header, dia =0.5mm |
| JP1 | 1 | WB/WT | Mouser | 649-78511-203HLF |
| JP2 | 1 | voltage | Mouser | 649-78511-203HLF |
| JP3 | 1 | CLKMUL | Mouser | 649-78511-203HLF |
| JP4 | 1 | FAN | Mouser | 649-78511-203HLF |
| U1 | 1 | TPS54308DDCR | Mouser | 595-TPS54308DDCR |
| R1 | 1 | 50Ω | Mouser | 603-RC0402JR-0750RL |
| R2 | 1 | 100kΩ | Mouser | 603-RC0805JR-07100KL |
| R3 | 1 | 22kΩ | Mouser | 603-RC0805JR-0722KL |
| R4 | 1 | 430kΩ | Mouser | 603-RC0805JR-07430KL |
| R5 | 1 | 91kΩ | Mouser | 603-RC0805JR-0791KL |
| R6 | 1 | 100Ω | Mouser | 603-RC0805JR-07100RL |
| C4,C3,C2,C1 | 4 | 10µF | Mouser | 80-C1206C106M3P |
| C6 | 1 | 75pf | Mouser | 581-08051A750J |
| C10,C9,C8,C7,C5 | 5 | 0.1µF | Mouser | 581-08055C104K |
| C11 | 1 | 47µF | Mouser | 80-T491C476M010 |
| L1 | 1 | 10µh | Mouser | 581-LMLP07A7M100DTAS |
The project is free for non-commercial reproduction. Do not sell it on Ebay or other platforms for profit. Do not make a closed source derivative. Share your experiences and ideas with the community.
This work is licensed under a Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International License.
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