Axial capacitors

Various tweaks and fixes from video ghosting to audio fixes etc.
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exxos
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Axial capacitors

Post by exxos » Tue Aug 22, 2017 10:58 pm

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In light of Axial capacitors being harder to find, not very good spec, or simply stupid prices, I came up with this little adapter board design.

The cost cost of the "kit" turned out a lot higher than I had initally thought and thus did not intend to put this into production. Though several people expressed interest in these, so I made a few up which are now available in my store.

The main challenge was finding some small enough capacitors with a good enough ESR rating. The 4,700uF capacitors are used on my Atari's from the ST to STE, to Falcon so this design is a one size fits all type solution, at least for the 4,700uF value.

The overall size of the board isn't any larger than the existing axial capacitor. While the 4,700uF original probably has a pretty bad ESR figure, my boards value is 5,440uF @ 7.6Amps.

I tested this on a STE motherboard and it really helped with stability , in particular the floppy drives motor generally casues a dip in voltage and this simple board helps reduce that and increases stability of the system overall.

I am also aware of many other axial's from 2,200uF down to 100uF (and possibly lower on the Falcon). Smaller boards could be done to replace them all with basically ceramic based cap-boards. At least then they would never degrade over time like electrolytics do. This is on my "to do list" but likely isn't going to be done any time soon.

STORE LINK
https://www.exxoshost.co.uk/atari/last/storenew/#0090

..wrap..
4MB STFM 1.44 FD- VELOCE+ 020 STE - 4MB STE 32MHz - STFM 16MHz - STM - MEGA ST - Falcon 030 CT60 - Atari 2600 - Atari 7800 - Gigafile - SD Floppy Emulator - PeST - HxC - CosmosEx - Ultrasatan - various clutter

https://www.exxoshost.co.uk/atari/ All my hardware guides - mods - games - STOS
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