R7 voltage is essentially 0 (0.04 on DMM)
Also -5.15V of neg reg does actually add up, vbe 0.65x2 + green led 1.9x2 , so dont think there is a problem. soekris can tolerate -5.5V so -5.15V is fine.
I upped to 15V input but behaviour is the same for pos reg.
Also -5.15V of neg reg does actually add up, vbe 0.65x2 + green led 1.9x2 , so dont think there is a problem. soekris can tolerate -5.5V so -5.15V is fine.
I upped to 15V input but behaviour is the same for pos reg.
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I upped to 15V input but behaviour is the same for pos reg.
OK so we exclude that. Check that Q4 gives a logical Vbe measurement too.
R1 voltage drop divided by R1 Ohms should also indicate the programmed constant current you targeted.
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