Atari I, Robot Switching Power Supply Rebuild, Hall Effect Joystick Rebuild, ...

[10100rsn]

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.  ;)

[iankellogg]

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.

[10100rsn]

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.

[iankellogg]

1n914 or 1n4148 are high speed 0.2a 100v diodes. There shouldn't be very much current in use there