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(under improvement -most functions working)
picture outside follows
summary:
the wish for a selfmade
voltage supply is nearly as old as my first steps in electronics
the wish
grew bigger and bigger and my wannahave features increased
it should be a
linear controlled suppy
with a lot of power and less ripple (< 10mV)
and after redesigning the
linear regulation for the third time I got a solution with <5mV and good
loadchange behaviour
the secondary transformator windings are automaticaly
connected serial or parallel via a industryrelay to decrease the lost power
during the linear regulation:
0-15V: parallel, 15-30V:
serial
normal control:
control via keys
extern control: 2 analog voltages can control the set points of voltage and
current
PC control:
set points from PC (under construction)
set points, actuel values and
control mode are shown simultaneous on a LCD-display and even the temperature at
the touch of a button
set points for voltage and current can be adjusted
by buttons with small and
high valuechange
the fans of the three coolers are seperatly
temperature controlled
and therefore very quiet
shutdown of the supply if temperature is too high
and error on display with actual temperatures
picture inside
follows
relay PCB:
supply PCB: 
Shunt PCB:
brain PCB:
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