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  1. GPG1

    70 volt regulator

    If the zener reads low both ways it is :'( You say "I found the zener to be a 8.5v approx 1.5 A " How did you test it?. If it has some writing on it tell us, and the values of the resistors
  2. GPG1

    70 volt regulator

    The zener is the reference for the regulator. When the voltage on the base of the transistor exceeds the zener voltage plus Vbe, the transistor conducts tending to remove base drive from the pass transistor. So the regulated output is (Vz + Vbe)*(1+R1/R2) What are the original values?
  3. GPG1

    70 volt regulator

    Attachment did not attach so its here http://homepages.slingshot.co.nz/~peg/
  4. GPG1

    70 volt regulator

    The zener is the reference for the regulator. MJE800 is a darlington transistor http://www.fairchildsemi.com/ds/MJ/MJE803.pdf Does that make it look like the att. The unlabelled resistors are part of the darlington.
  5. GPG1

    Need help with 2 ideas

    It is possible to use the drop across your existing wiring to measure the current. The way I have done it is to use a magnetic field sensor like this: http://www.allegromicro.com/sf/0750/ I rolled my own using a sensor and a modfied rectangular ferrite core salvaged from an old tv line drive...
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