[sdiy] +-12V supply

[harrybissell]

ok ok... but note that the monster will not take anymore power than it
wants to (being subject to Ohm's law) and if you want it to take MORE
you need to crank up the voltage.  Maybe a fullwave bridge right off the
mains...and a couple of large lytics in series to form an (AC) center tap...

(newbies... NO NO NO back away from the wall outlet !!!)

H^) harry

Chris CROSSKEY wrote:

> But I like building power supplies.... it brings out the Frankenstein in
> me...
>
> "....MORE POWER IGOR!!!"
>
> ".... you mindless FOOLS, mankind is not meant to meddle with such forces!!"
>
> you'd understand if you'd seen some of my more overengineered PSU's.....
>
> chrisc
>
> ----- Original Message -----
> From: "harrybissell" <harrybissell at prodigy.net>
> To: "Chris CROSSKEY" <chris at crosskey.fslife.co.uk>
> Cc: "synth" <synth-diy at dropmix.xs4all.nl>
> Sent: Friday, January 14, 2005 4:44 AM
> Subject: Re: [sdiy] +-12V supply
>
> > fvck it... buy a PowerOne and be done !!!
> >
> > (this is why I don't build power supplies  :^)
> >
> > H^) harry
> >
> > Chris CROSSKEY wrote:
> >
> >>  Toss out the 7812/7912 and use a 723 on each side with a big bypass
> >> transistor.....
> >>
> >> that said, don't overdo the resevoir cap or it will start to make ripple
> >> an
> >> issue, a series of decade divided bypass caps isn't a bad idea... 100uF
> >> tant, 10uF tant, 1uF, 100nF,10nF, 1nF polyester...OTT but you get a nice
> >> warm glow from the knowledge that everythign is getting caught.... they
> >> ain't no such thing as an oversized heatsink, overspec the rectifier to
> >> make
> >> sure it runs cold, over spec the transformer adn make sure it's
> >> toroid.....
> >>
> >> chrisc
> >>
> >> ----- Original Message -----
> >> From: "Pat Kammerer" <spivkurl at wearerecords.com>
> >> To: "sdiy" <synth-diy at dropmix.xs4all.nl>
> >> Sent: Thursday, January 13, 2005 12:57 AM
> >> Subject: [sdiy] +-12V supply
> >>
> >> > Okay I'm making a PCB for an improved power supply (based on 7812 and
> >> > 7912
> >> > TO-220), and I had a quick question.
> >> >
> >> > Other than larger filter capacitors, are there any simple modifications
> >> > to
> >> > the "basic" regulated power supply which would enable even lower noise
> >> > floor?  Maybe it's too vague, but I'm not sure how else to put it.  I
> >> > just
> >> > want to make a good simple low noise linear PSU.
> >> >
> >> > Thanks for any help,
> >> > Pat
> >> >
> >> >
> >
> >