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Proximity Alarm - This simple circuit is sure to have the police
beating a path to your door, however, it has the added advantage of
alerting you to their presence even before their footsteps fall on the
doormat. The circuit transmits on Medium Wave (this is the small problem
with the police). IC1a, together with a sensor (try a 20cm x 20cm sheet of
tin foil) oscillates.... [Circuit design by Rev. Thomas Scarborough]
Proximity Detector - Here is a Simple but Very Effective
One....(electronic schematic added 12/08)
Radio Wave Alarm - This simple circuit is sure to have the
police beating a path to your door, however, it has the added advantage of
alerting you to their presence even before their footsteps fall on the
doormat. The circuit transmits on Medium Wave (this is the small problem
with the police). IC1a, together with a sensor (try a 20cm x 20cm sheet of
tin foil) oscillates.... [Rev. Thomas Scarborough]
RS232C Link Monitors Animal Activity - 11/06/97 EDN-Design Ideas....A common
need in biological experimentation is the ability to unobtrusively monitor the
activity of small caged animals, such as mice, rats, and rabbits, as they move about
their enclosures. This monitoring must be over long periods and around the
clock. The circuit in.... [Design Idea by W Stephen Woodward, University of North
Carolina--Chapel Hill]
