[sdiy] How much is too much?

[Scott Gravenhorst]

Any condition that causes what should be a logic level to remain in the
"no man's land" between logic levels can be problematic.  I think that
the defined levels for logic states are slightly different for TTL and
CMOS, even running both at 5 volts.  TTL claims to be able to work from
4.75 to 5.25 volts Vcc, though I think a logical 1 starts around 2.7
volts.  Not sure about CMOS.  That should be in the data sheets.

mark verbos <mverbos at earthlink.net> wrote:
>On a power supply for digital electronics, how much ripple is too much? 
>When do the parts just freak out? I have an RSF SD140 drum machine that 
>doesn't work and I have no schematics. I have just checked the 5 volt 
>line and there is a little ripple on it. Would that make the thing not 
>power up? I'll just go ahead and change the caps on it, but I'm curious 
>anyway.
>
>Mark
>
>
>

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