Mwee Posted February 4, 2007 Report Share Posted February 4, 2007 Could someone look over this circuit and see if you can see any problems. Cheers Quote Link to comment Share on other sites More sharing options...
audioguru Posted February 4, 2007 Report Share Posted February 4, 2007 Your schematic is a fuzzy JPG file type. It is too bad you didn't save it and attach it as a clear GIF or PNG file type so we can see the parts values.What are you going to use it for? It just makes a continuous beep and quickly kills the 9V battery. Do you have an AM radio that operates at its frequency?Add a 100uF supply bypass capacitor for the 555 and a 1000pf supply bypass capacitor for the RF transistors.Add a 22k resistor in serise with the slider of the trimpot so that you have better resolution of the amount of modulation. Without this resistor then when the trimpot is turned down the 555's output is shorted by the supply. Quote Link to comment Share on other sites More sharing options...
Mwee Posted February 4, 2007 Author Report Share Posted February 4, 2007 It would be used for a HAM fox hunt. How would you advise as to saving power? Quote Link to comment Share on other sites More sharing options...
audioguru Posted February 4, 2007 Report Share Posted February 4, 2007 A new 9V alkaline battery will power it all day. Quote Link to comment Share on other sites More sharing options...
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