Kevin Rosenberg wrote:
On Feb 11, 2011, at 9:44 PM, Neville Michie wrote:
[...]For the minus 12v I used a ICL7662, these are rare, so a cmos gate
oscillator and diode pump negative generator could be used. I am told the -12V
is quite uncritical.[...]
Thanks for the thoughts. I'm thinking about redoing the power supplies for my
T-bolts.
So, your comments are helpful.
May I ask where is the ICL7662 rare? Digikey has over 20K in various forms.
I've also heard that the 5V supply is not noise critical. For your minimum
power goal,
I imagine that's why you used a switcher rather than lose up to 0.4A x 7V
(2.8W) using
a linear 5V regular off the +12V line.
Kevin
You could look at using a variant of the Cuk switching regulator.
These can have relatively low input and output noise before any
additional filters that may be added.
Bruce
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