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Electronics Formulas and Sample Circuits
N5OSH

First, we need some parts to make a schematic.  Jim Martinelli came up with this nifty block for easy schematic creation with Micro$oft Windoze Paint.   I converted the file to a 'GIF' to take less memory on the page.

Here is another interesting bit of info for those of you that work with Printed Circuit Boards.  Please keep in mind that the trace current is an estimate that also includes a temperature rise for the conductor.   I prefer planning for 400% of the actual current to prevent heating. 

 

WIRE SHUNTS for power supplies... A little less expensive than Power Resistors!

SINGLE LAYER AIR CORE Calculation.  I will have to check, but I am not sure whether the measurement units are in inches or cm?

USA TELEPHONE LINE SPECIFICATIONS, or at least this is what I have found to be accurate so far...

RING DETECTOR


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73 and Thanks,
Al K3TKJ

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