In article <201101191636.p0JGaCm5021032@...>,
Reese <reeza@...> wrote:
On the chance that the brick is properly toasted and cannot be fixed,
what are some other options for 12vdc @ 4a to power the monitor?
Car battery ? :-)
Maybe:
.
LM338 is an adjustable regulator output can be set at 12V. It is a 5A
regulator so the external regulator transistor is not requiredThis design
is a bit over-rated for your requirement. Transformer can be 15V at 85VA
or you /might/ get away with a 12V transformer depending on your incoming
mains. C1 capacity could be halved and voltage rating 25V upwards. Again,
B1 could be downrated to 5A. Personaly i always put a fuse on the
transformer seconary side and this should be 5A "Anti-surge"
Note. I haven't fully worked through the design but it looks OK.
--
Stuart Winsor
Midland RISC OS show - Sat July 9th 2011
