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 by angelsix ¦  Thu May 07, 2009 11:53 pm ¦  Forum: SparkFun Product Questions ¦  Topic: 78L05 Filter Cap on input. Do I need them in this case? ¦  Replies: 27 ¦  Views: 5881

I'll read up on opto isolators also. Still no clarity on this voltage divider/diode clamp.. I posted a post that has been blocked and awaiting moderation but I basically asked if vy a voltage divider you simply mean 2 resistors and the Vout coming off in between the 2, and doing that for all 5 input...

 by angelsix ¦  Thu May 07, 2009 5:48 am ¦  Forum: SparkFun Product Questions ¦  Topic: 78L05 Filter Cap on input. Do I need them in this case? ¦  Replies: 27 ¦  Views: 5881

What part of it is silly exactly? Presumably just the regulators? As the only other thing in this circuit is the mosfets which are needed and cannot be made simpler. As for cost... can I really save that much with 78l05s costing £0.10 each? That means the other method must cost less than £0.60 to do...

 by angelsix ¦  Thu May 07, 2009 5:29 am ¦  Forum: SparkFun Product Questions ¦  Topic: 78L05 Filter Cap on input. Do I need them in this case? ¦  Replies: 27 ¦  Views: 5881

The only reason I'm using regulators is that I am new to electronics and thats the only component I know of at the moment to bring the 28 to 5. Could you please explain a little more about the other 2 options what components/schematics are needed? Also, the circuit will be drawing 5A on the 28v in b...

78L05 Filter Cap on input. Do I need them in this case?

 by angelsix ¦  Thu May 07, 2009 4:17 am ¦  Forum: SparkFun Product Questions ¦  Topic: 78L05 Filter Cap on input. Do I need them in this case? ¦  Replies: 27 ¦  Views: 5881

OK basically what I have is a unit that will run off a 24v trailer battery running at ~28v with engine running and alternator going. The 28v comes in and steps down to 5v using a 78L05, with 10uF cap for input-gnd, and a .1uF cap on output-gnd for chip. Thats all fine. Then I have 5 inputs going to ...

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