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Last Updated:
Tuesday, November 17, 2009 02:51 AM
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Featured Circuit of the Week |
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Cut Phone Line Alarm --
Burglars, rapists and other criminals will often cut
a phone line before they break into a home. The cut phone line will prevent
many alarm systems from alerting the police. The battery powered circuit
below will sound an alarm when the unit no longer detects the voltage present on
an active phone line.... |
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Please
email
ideas for Circuit of the Week |
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All Circuits of the Week |
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Dave is
available for consulting projects - give him a call |
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Dave's other websites to visit: |
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collection of resources for inventors,
hobbyists, scientists & engineers |
resource
portal for information
regarding renewable, alternative
or sustainable energy |
Dave
Johnson & Associates -
consulting services for new products from conception to
production or improving the
cost & performance of existing products |
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David A. Johnson, P.E. is an
electronics engineer with over 30 years practical experience in
the areas of analog & digital design, fiber optics and RFID. Electronics is his
vocation, hobby and passion. He is a published author with articles and designs in
EDN, Electric Design, Midnight Engineering and Popular Electronics. Throughout
his career, Dave's imaginative approach to design has resulted in applying new
technologies in creative and cost saving ways. |
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