[XCSSA] Power Supplies Continued

[X-otic Computer Systems of San Antonio]

Howdy...

Personally I would fuse the hot line of the 120 VAC input.
I would not ground the circuit to the third prong, however if you have a 
metal case, it would be a good idea to ground it.
The third prong is a safety ground, not a signal ground so to say...

I'm not familiar with building a power supply but I can have a look at 
it if you want to.
I would find a regulator (7805, LM1086, LM2940 or similar) that fits my 
need and follow the manufacturers recommendations...

Start by specifying your needs and then search for a regulator that fits.

/Fredrik

X-otic Computer Systems of San Antonio wrote:
> Alright I've got another couple of questions about power supplies :)  
> While I am likely going to make things easier on myself and buy a pre- 
> made mainboard and parts kit for my MidiBox SID, I still need to  
> figure out how to power the thing. Fredrick was kind enough to let me  
> have an extra C64 PSU, but I'm actually thinking it might be fun to  
> make my own power brick.
>
> The idea is to have 1 or 2 transformers (I'm having trouble finding  
> multi-taps that output 9 and 5VAC) connected to mains and then rectify  
> and regulate those. My previous method called for using voltage  
> regulators in series with a big heatsink. That works, but it seems  
> kinda lame and intentionally less efficient.
>
> So, my questions are then - for fusing the 120VAC input, do I just  
> need to fuse the positive line (and not the neutral)? And, assuming I  
> use a 3-pronged cord, do I ground everything to the 3rd prong  
> (basically connect it to the ground plane of the board, assuming I get  
> a printed board)? Also does anyone know what those laptop style cable  
> and connectors are called? You know, the ones that has a standard 3- 
> prong on one and hexagonal female on the other? It looks sort of like  
> a nuclear warning sign. Dell uses it alot on their connectors. I  
> figured that would be easier to use than trying to strip a normal AC  
> table and all that stuff.
>
> If anyone wants to see my (very much alpha) design, I'd be happy to  
> send it your way!
>
> Thanks! Oh and Happy New Year!
>
> Tim
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