Re: mass storage for Apple //c

[Michael J. Mahon <mjmahon@aol.com>]

David Schmenk <dschmenk@gmail.com> wrote:
> On Wednesday, 12 June 2013 00:13:56 UTC-7, Michael J. Mahon  wrote:
>> Riccardo <rigreco.grc@gmail.com> wrote:
>> 
>>> The converter have a system protection of short-circuit or over range
>> 
>>> current, (by a feedback control - it can put down all voltage output to 0
>> 
>>> V for safety),  but, anyway, all depends to type of over load current
>> 
>>> (time/current curve). 
>> 
>>> 
>> 
>>>> 
>> 
>>>> The supply has internal protection. It will probably work fine--just give
>> 
>>>> 
>> 
>>>> it a try. 
>> 
>>>> 
>> 
>>> 
>> 
>>> Oh no thanks! :-)
>> 
>>> 
>> 
>>> (I don't trust of internal protection)
>> 
>>> 
>> 
>>> Ric.
>> 
>> 
>> 
>> The internal supply must protect itself from overloads, since there is no
>> 
>> fusing on any connectors to the outside world. 
>> 
>> 
>> 
>> A bad power supply can fry a main board, but I've never seen a bad main
>> 
>> board (or joystick, or...) fry a power supply. They just shut down
>> 
>> (repeatedly) until the load is manageable. 
>> 
>> 
>> 
>> -michael - NadaNet 3.1 and AppleCrate II: http://home.comcast.net/~mjmahon
> 
> Actually, I have some ROM 0 //c's and they do have a fuse on the MB. 
> Looks like a little glass cap near the back left.   Couldn't find it on
> any schematics, but managed to "discover" it when I was making a 12 V car adapter.
> 
> Dave...

So I'm guessing it's on the external supply line, just in case the polarity
is reversed or voltage too high. 

-michael - NadaNet 3.1 and AppleCrate II: http://home.comcast.net/~mjmahon