At 12:34 PM 8/30/03 -0800, you wrote: > I have not seen them for years. a little line current all >the time, so this thing would have to distinguish between a fraction of an >amp, and the higher draw when the TV is actually on.
Use a step down transformer in reverse. Put the low voltage side (secondary) in series with your load and connect a relay to the high voltage side (primary). Use a transformer that has a LOW voltage output, say 3 volts, and a current rating similar to that of the load that you're monitoring. That should give roughly 3 volts line drop to the load being monitored, that shouldn't affect the load. The relay needs to roughly match the output (primary side). You'll have to play with the ratings and you may need to put a dropping resistor in series with the relay to decrease it's sensitivity. The transformer should have low voltage output when little current is flowing to the load (the load is off). When the load is on and drawing appreciable current then the output voltage will rise and engage the relay. Joe Or is there a >commercial product that will do the job? Thanks in advance. Syd H. Levine >AnaLog Services, Inc. > 270-276-5671 > 270-276-5588 > [EMAIL PROTECTED] > www.logwell.com -- Author: Joe INET: [EMAIL PROTECTED] Fat City Network Services -- 858-538-5051 http://www.fatcity.com San Diego, California -- Mailing list and web hosting services --------------------------------------------------------------------- To REMOVE yourself from this mailing list, send an E-Mail message to: [EMAIL PROTECTED] (note EXACT spelling of 'ListGuru') and in the message BODY, include a line containing: UNSUB CHIPDIR-L (or the name of mailing list you want to be removed from). You may also send the HELP command for other information (like subscribing).
