Reply to "Design of a $10-20 DCS-TIU Port Tester Tool?"

I ordered 2 kits from Tom a while ago and finally got around to assembling one. Other than the pads on U1being really close, soldering was straight forward.

I powered it up and all seemed to operate fine. I started Stan's calibration and verified 5 volts. I set the pot in the middle and momentarily touched I had a red light flash. I rotated the pot to both extremes and got the expected results of neither flash and both flash.

The problem - while making adjustments, I apparently had my probe slip from one side of R11 to D2 while I connected to D1. Now when I power up with no DCS signal the red light comes on and stays on. The power LED comes on and there is still 5 vdc.  Figured I blew one or more components.

Does anyone have a thought on which one or other simple measurements to isolate?

Ken

OGR Publishing, Inc., 1310 Eastside Centre Ct, Suite 6, Mountain Home, AR 72653
330-757-3020

www.ogaugerr.com
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