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FUA7805 in Q1 on 680 mother bd

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  by William Dromgoole - 06/21/2009 18:55
On a 7805 pin 1 is input,pin 2 is Gnd and pin 3 is the output.
What it looks like is happening is pin 2 is connected to -15.9 volts. Pin 1 is - 6.3 volts so input is 9.6 volts positive with respect to pin 2 and the output is 5 volts positive with respect to pin 2 or -10.9 volts.Circuit loading could drag that down(or up) to -8.4 volts.

Thats my theory anyway.

billdrom

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