| The power supply illustrated
below is controlled by a Measurement Computing USB1208FS Data
Acquisition Card. To protect the card from the inadvertent
application of high voltage two opto-isolators are used.
The first, U1 is a Perkin-Elmer VTL5C2 resistive device, the
second, U5 is a Vishay IL300 or Agilent HCNR200/1. Power
is borrowed from the USB1208FS for the opto-isolators and
opamps. The +5V on the USB1208 is a bit noisy so a 33uF
tantalum capacitor and 100uH choke ( are used. |
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