[Milsurplus] DC-DC: Need a Receiver Bias Supply?

[David Stinson]

Another use for these little DC-DC converter bricks:
If you get one that's isolated (the output does not share a common
negative or ground with the input), you can use it to "flip"
your A+ voltage of 6, 12, or 24 volts and zener it to a nice 
little bias supply.
There are many little low-current converters available for cheap 
with various inputs and outputs.
For example- if your A+ is 12 Volts and you need -7.5 bias,
get one that does 10-16 Volts in,  9 or 12 Volts out.  
Resistor and a zener and away you go.

The RFI situation may vary, but I've built a couple of supplies 
using DC-DC converters with ferrites and a metal box to 
encase them.  It's worked for me with the residual "birdies" not
being any problem (hey... whadda ya want for a $10 supply??).

To see what's available, search the Bay with this string:

-non dc-dc converter isolated

"-non" because otherwise it will list "non-isolated" and that
won't work for a bias supply.

73 DE Dave AB5S