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Title: Atari I, Robot Switching Power Supply Rebuild, Hall Effect Joystick Rebuild, ... Post by: 10100rsn on August 11, 2015, 07:40:21 pm Great job on that I,Robot guys! I think that mod with power and sense lines running to the test points is important with that supply. It should last a long time with that mod in place. Need to get me a thermal camera. ;)
CR21, CR22, CR23 and CR24 on that power supply create a bridge rectifier circuit and should all be 1N4001, but I think what's in there should be ok. They are listed as 1N914 on the schematic but in the parts list they are listed as 1N4001 which I believe would be correct. Looking at the data sheets I think a 1N914 might be ok there, though... I'm really curious about what Ian thinks about those diodes. I don't think I saw that in the video... Anyway, can't wait to see the next one. ;) Title: Re: Atari I, Robot Switching Power Supply Rebuild, Hall Effect Joystick Rebuild, ... Post by: iankellogg on August 20, 2015, 05:11:57 pm I imagine the 1n4148 will be fine since those diodes are all on very low current lines. the 1n4001 is a 1A diode and I think that is actually what is in the original board. I will probably change the diodes to something better anyways.
Title: Re: Atari I, Robot Switching Power Supply Rebuild, Hall Effect Joystick Rebuild, ... Post by: 10100rsn on August 20, 2015, 09:34:07 pm Thanks Ian. I've never encountered 1n914 diodes before. The 1n914 as a bridge rectifier just seems like it might have been a mistake even though I'm sure they could handle the little current going through there. I'm no expert though. :)
Title: Re: Atari I, Robot Switching Power Supply Rebuild, Hall Effect Joystick Rebuild, ... Post by: iankellogg on August 20, 2015, 09:36:13 pm 1n914 or 1n4148 are high speed 0.2a 100v diodes. There shouldn't be very much current in use there
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