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SukkoPera / Raemixx500

Open Hardware Remake of the Commodore Amiga 500+ Mainboard
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C401/402 #16

Closed SukkoPera closed 4 years ago

SukkoPera commented 4 years ago

C401 and 402 (video power) are specified as 1000 uF, but these had higher values in older revs, as I've personally seen up to 3300 uF. While 1000 uF can be fine, we might change and move their footprints a bit so that physically larger caps will fit (they always had a hard time anyway, even of older boards there wasn't enough room!).

A quick search on RS shows that a diameter of 16 mm should be enough. Good candidates are Panasonic EEUFS1C332 (16V, 12.5 (Dia.) x 25mm) or EEUFS1E332L (25V, 12.5 (Dia.) x 35mm). The FS series has very low ESR. The original footprints have a diameter of 8 mm and a pitch of 5 mm.

SukkoPera commented 4 years ago

Fitting 16mm footprints proved not trivial, so I went for 12.5mm, which just required offsetting a couple of tracks.

Pitch remains 5mm, so hopefully everybody can be happy.

SukkoPera commented 4 years ago

For uniformity's sake, d1d801d also changes C307 (the only other 1000uF cap) to D12.5mm.