DC DC

I could start looking but I might miss something.
Looking for a + - 15 volts or therebouts at least 100 ma. supply
from 9-15 volts input. The key is low in-out capacitance and resistance.
I really should be using something less than 50 pf. The lowest one
I have is about 200-300 pf.

greg

 

Actually, the Traco measures 86 pf, better than I thought. Still looking for better.

greg

 

Sorry..I dont understand the question..
Something is very important is missing..??
D from BC

 

I did find some supplies. About 7 pf I/O capacitance from Traco. Now to see what
money I need.

greg

 

Power supplies offering galavanic isolation still have some
capacitance across the isolation barrier - voltage noise on the input
side will drive some noise current into the output ground connection,
and vice versa. It can be important to minimise this.

Ralph Morrison's "Grounding and Shielding Techniques" published by
Wiley Interscience (John Wiley and Sons) - ISBN0-471-24518-6 - is very
informative on the subject.

He liked double-screened transformers, with one screen grounded to one
side of the isolaton barrier, and the other screen grounded to the
other side. Cute.

 

He appears to want a DC-DC converter that has low capacitance between
the input and the output. Maybe low leakage as well, if that is why
"resistance" is in there.


Best regards,
Spehro Pefhany