In SX Microcontrollers, SX/B Compiler and SX-Key Tool, johncouture wrote:

When building a PCB to be fitted into a car with 12VDC:
 

1) Let's say I tap the cigarette lighter jack and put a fuse on the line

2) I use a 7805 IC to drop the power down with a 100uf 25V cap on either side to mellow out the voltage

3) I use a 1N4004 from out to in (anode connected to in) 

 

Does this provide reliable power for a SX.  In other words, car power systems are typically pretty noisy and prone to ups and downs.  Will the 7805 and the two caps mellow out the power to be reliable for a sensitive SX circuit?

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