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Power supplies / Help with -5vdc for JSR-01
« on: July 19, 2011, 06:13:34 AM »
I have already built the +5vdc version of the JSR-01 reg...but I am having trouble building a -5vdc version.
I have completed it but now get -7.6vdc on the output....I have done the following
input is -22vdc
H1 lamp is on
R10 = 47 ohms
C10 = 100 nF
C11 = Tin jumper
all above are done and ok
r4 wire bridge changed to r5 for neg version
6v8 zener in z2 position
t1 t2 and t3 are correct neg regs
tl431aid is in position ic8
any ideas??
pictures to follow
I have completed it but now get -7.6vdc on the output....I have done the following
input is -22vdc
H1 lamp is on
R10 = 47 ohms
C10 = 100 nF
C11 = Tin jumper
all above are done and ok
r4 wire bridge changed to r5 for neg version
6v8 zener in z2 position
t1 t2 and t3 are correct neg regs
tl431aid is in position ic8
any ideas??
pictures to follow