4 layers64 × 88.6 mm
SF500
jbilander/SF500
Spitfire 500, A low-end 14 MHz Accelerator with IDE and 4/8 MB fast RAM for the Amiga 500.
52 parts82CC-BY-SA-4.0
2 layers45 × 15 mm
A1200 IDE LED fix board
jbilander/A1200_IDE_LED_fix_board5A small PCB that fixes the IDE Activity LED always lit problem on the A1200.
- Size
- 45 × 15 mm
- Copper layers
- 2
- Thickness
- 1.6 mm
- Parts
- 6
- Nets
- 43
- Pads
- 96
- Tracks, vias
- 80, 5
- Pours
- 2
- Routed
- Yes
- KiCad
- KiCad 5 (file 20171130)
- Created
- 11 Mar 2022
- Updated
- 26 Apr 2022
Overview
A1200 IDE LED fix board is an open-source printed circuit board by jbilander, from the jbilander/A1200_IDE_LED_fix_board repository on GitHub, published under the CC-BY-SA-4.0 licence. It is a 2-layer board of 45 × 15 mm with 6 parts on 43 nets, routed with 80 tracks and 5 vias.
It is built around the 74HCT2G14GW. Its parts include 2 connectors, 1 capacitor and 1 IC.
Main components
1README
README.mdA1200_IDE_LED_fix_board
A small PCB that fixes the IDE Activity LED always being lit problem on the A1200.
Video:
https://drive.google.com/file/d/1M3btw3f4qckySm2AM4Yh1fa0WKVMcq9z/view?usp=sharing
Symptom:
When using the Sintechi (*) SD2IDE-adapter in an A1200 the H.Drive LED is always on.
Apart from this, these adapters works perfectly.Cause:
The motherboard should turn on the HD LED when the IDE /ACTIVE input is low.
However, the transistor on the motherboard controlling the HD LED will switch it on
whenever it sees more than ~0.6V difference from 5V on /ACTIVE.
As the more recent version of these SD card adapter outputs 3.3V when there is no activity,
the LED will never be switched off.Solution:
Using a 74HCT14 IC in-between the pin 39 /Active signal will bump the 3.3V
up to 5V since HCT has TTL-level inputs. 2V is enough to detect a High,
which will then be shifted up to 5V on the output.Description taken from here
BOM Rev. A
| Position | Name/Value | Package | Notes |
|---|---|---|---|
| U1 | 74HCT2G14 | TSOP-6 | Dual inverting Schmitt trigger |
| C1 | 0.1uF = 100nF | 0805 | Decoupling capacitor |
| J1 | PinSocket_2x22_P2.00mm_EdgeMount_SMD | ||
| J2 | PinHeader_2x22_P2.00mm_EdgeMount_SMD |
This work is licensed under a Creative Commons Attribution-ShareAlike 4.0 International License.
Parts
6| Qty | Value | Footprint | References |
|---|---|---|---|
| 1 | 0.1uF | Capacitor_SMD:C_0805_2012Metric_Pad1.15x1.40mm_HandSolder | C1 |
| 1 | 74HCT2G14 | Package_SO:TSOP-6_1.65x3.05mm_P0.95mm | U1 |
| 1 | Conn_02x22_Odd_Even | A1200_IDE_LED_fix_board:PinHeader_2x22_P2.00mm_EdgeMount_SMD | J2 |
| 1 | Conn_02x22_Odd_Even | A1200_IDE_LED_fix_board:PinSocket_2x22_P2.00mm_EdgeMount_SMD | J1 |
The 4 most common of 6 parts.
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Questions
How big is the A1200 IDE LED fix board PCB?
It measures 45 × 15 mm and has 2 copper layers, 1.6 mm thick.
What parts does the A1200 IDE LED fix board use?
6 parts, built around the 74HCT2G14GW. 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 A1200 IDE LED fix board KiCad files?
From the jbilander/A1200_IDE_LED_fix_board repository on GitHub, at the commit this page was made from: the board is KiCad/A1200_IDE_LED_fix_board.kicad_pcb. PCBKit opens the board in the browser, with nothing to install.
Can I use the A1200 IDE LED fix board design in my own project?
Its repository publishes it under the CC-BY-SA-4.0 licence: you may reuse it on that licence's terms (keep the author's notice, and for a copyleft licence share your changes alike).