iamlark Posted September 23, 2005 Report Share Posted September 23, 2005 i just got a 16v PSU to power my SID. i'm worried about over-heating the core voltage regulator by sending 16v straight into it, so i want to build a sort of "step-down" module. my question is, is this simple enough that i can stick a 7809 regulator between the main power in and the core or do i need caps in there as well?thank you.-joey Quote Link to comment Share on other sites More sharing options...
pay_c Posted September 23, 2005 Report Share Posted September 23, 2005 If you use 78xx the caps *should* be there in any case - should means no must anyhow. So at least you should use one cap (like 1000 µF) between the power and the 7809 and another one after the 7809. And then the normal caps already on the core.I would even think about adding more of those things, because: 16 Volt - 9 Volt = 7 Volts; 7 Volts * lets say 300 mA = 2,1 watts pure heat - really much for a 78xx (heatsink!!!)Perhaps a 7812, then the 7809 and back to the core (7805)? Quote Link to comment Share on other sites More sharing options...
iamlark Posted September 24, 2005 Author Report Share Posted September 24, 2005 sounds easy enough.should i put caps around each regulator? like this:input>2200uF>7812>2200uF>7809>100uF>outputor something like that?i need to read up on caps and whatnot.... Quote Link to comment Share on other sites More sharing options...
smashtv Posted September 24, 2005 Report Share Posted September 24, 2005 should i put caps around each regulator? like this:input>2200uF>7812>2200uF>7809>100uF>outputYou can lose the 2200uF between the regulators:input>2200uF>7812>7809>100uF>outputBestSmash Quote Link to comment Share on other sites More sharing options...
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