Quote:
Originally Posted by bikerhifinut
Lovely job!
I just wondered if it would be an idea to rework the Voltage regulator to incorporate a standard adjustable regulator. that would of course entail squeezing in a couple of resistors for the potential divider network.
I figured theres a fair few of us with a drawer full of LM317/LD1084 etc etc 3 legged regulator chips which can be used for any voltage between about 3 to 30V.
Best regards.
Andy
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Well I have taken up Andy's challenge.
I created a custom symbol to represent the regulator so that either a 78LXX device or an LM 317 can be used. I also created a custom hybrid footprint so that again either device can be inserted.
R101 and R102 are the voltage programing resistors, the present values give 9.6V which is about what a new 9V battery gives. (although if using a 12V walwart you might want to reduce this to give the specified 3V headroom for the regulator)
R101 and R102 are not used if using a 78L09.
Again if using battery then U101 is not fitted and D101 replaced with a link (R101 and R102 are not used in this case also)
Again I will leave it a couple of days for final comments and then order the pcbs.
Peter
ps the detail view of the regulator footprint is looking from the top without the groundplane and showing the rear tracks as though the board was transparent