Guest 12412 Posted November 18, 2004 Report Share Posted November 18, 2004 ;D ;D ;D Quote Link to comment Share on other sites More sharing options...
Guest 12412 Posted November 18, 2004 Report Share Posted November 18, 2004 http://www.electronics-lab.com/projects/sensors/026/index.html Quote Link to comment Share on other sites More sharing options...
Guest 12412 Posted November 18, 2004 Report Share Posted November 18, 2004 Quote Link to comment Share on other sites More sharing options...
Guest 12412 Posted November 18, 2004 Report Share Posted November 18, 2004 The circuit described here is that of a metal detector. The opera- tion of the circuit is based on superheterodyning principle which is commonly used in superhet receivers. The circuit utilises two RF oscillators. The frequencies of both oscillators are fixed at 5.5 MHz. The first RF oscillator comprises transistor T1 (BF 494) and a 5.5MHz ceramic filter commonly used in TV sound-IF section. The second oscillator is a Colpitt Quote Link to comment Share on other sites More sharing options...
Guest 12412 Posted November 26, 2004 Report Share Posted November 26, 2004 has any one buit it that can tell about it Quote Link to comment Share on other sites More sharing options...
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