[sdiy] MG-1 first mods, VC res

[jamhoney]

> ... 35V is the MAXIMUM
> for all 78xx and 79xx regulators, except the 7824 and 7924.

Can you cascade 2 regulators? Like, transformer --> 7824 --> 7815? I
believe it's okay, but...

Is there limit on the maximum load? Example: Given a 7824 and a 7815
that are each rated at 1 Amp, can you squeeze a full Amp though the
7815? I'll guess that you have to allow for some current loss at the
second regulator.
--
john


----- Original Message ----- 
From: "harrybissell" <harrybissell at prodigy.net>
To: "Metrophage" <c0r3dump23 at yahoo.com>
Cc: <synth-diy at dropmix.xs4all.nl>
Sent: Sunday, October 31, 2004 2:35 PM
Subject: Re: [sdiy] MG-1 first mods, VC res


> Metrophage wrote: <snipp'd>
>
> > These things get extremely hot! Might this be because the 58vct
> > transformer is a but much for +12/-15 volts? I wonder if the
regulators
> > might be happier with something like 35vct. Opinions?
>
> If that is 58vct AC, the DC voltage would be just over 40V.   35V is
the
> MAXIMUM
> for all 78xx and 79xx regulators, except the 7824 and 7924.  You are
> dancing with
> sudden death here.
>
> Yes, that transformer is TOO high a voltage. I'd agree with the
35VCT
> (actually 36vct, dual
> 18V secondaries).  Even a 48VCT is too high for 15V supplies.
>
> H^) harry
>
> >
> >
> > CJ