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Sound Operated / Sound
Activated Circuits
#'s - P Q
- T U - Z
Last Updated on:
Monday, October 03, 2011 06:07 PM |
| Circuits
Designed by Dave Johnson, P.E. : |
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Audio Activated Switch
Drawing only 2uA from a 3v lithium battery, this circuit will turn on a
transistor switch, whenever it detects an audio signal greater than 0.035v
RMS.
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Links to electronic circuits, electronic schematics, designs for engineers, hobbyists,
students & inventors: |
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Add voice command to virtual instrumentation - 30-May-02 Issue of
EDN Debates still persist in the engineering community about the
relative merits of analog and digital controls of instrumentation.
Meanwhile, a revolutionary new type of control—voice-command control—is
gaining acceptance in many application areas (Reference 1]. This
Design Idea focuses on the practical implementation of the Voice Commander
voice-command interface in a virtual-instrume.... [Design Idea by Alexander
Bell, Infosoft International Inc, Rego Park, NY] |
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Add voice commands to your CAD system - 2-May-02 Issue of EDN
The first time I activated the Language Bar (Speech Tools] in my Microsoft
Word 2002 and started dictating this Design Idea, the on-screen title
displayed "cat" instead of "CAD." By using the "Add/Delete Words" feature,
I've trained the system to recognize the "CAD" acronym. This was my
first experience with the MOSR (Microsoft Office Speech Recognition] tool,
which is part of the latest Micros.... [Design Idea by Alexander Bell,
Infosoft International, Rego Park, NY] |
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Audio Activated Switch - This switch circuit is powered for years
by a single 3v lithium cell. Its transistor switch closes whenever the
circuit detects audio signals in excess of 50mv RMS. It can be used to
trigger relays or activate indicator lights. (added 12/04) ….
[Designed by David A. Johnson] |
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Audio Controlled Christmas Lights - Here is a simple circuit to control
110VAC things such as Christmas Lights with low voltage audio. Be careful, high
voltage AC can kill you. “The basic Idea was to have Christmas lights flash with
the music. In my design I use an ordinary amplified computer speaker, a diode bridge,
and a ‘CRYDOM’ SSR (Solid State Relay). In order to increase the time that the lights
were on as well as protect the SSR I used a Diode Bridge to rectify the signal from
the amplifier circuit.”....(added 02/09) |
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Clap Activated Remote - (circuit / schematic design added 11/06)
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Clap Relay - Clap sensitive on-off Relay. 3V Battery operated, small
portable unit, (added 03/05) |
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Clap Switch - Circuit / schematic (added 02/05) |
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Deer Repellent (techlib) - Here is a simple sensor which can detect the
seismic vibrations caused by a person or large animal walking nearby. A representative
application for the sensor is a deer repellent for the vegetable garden…..(added
02/05) |
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Dog Whistle - It's well known that many animals are particularly sensitive
to high-frequency sounds that humans can't hear. Many commercial pest repellers based
on this principle are available, most of them operating in the range of 30 to 50 kHz.
From what I've read, dogs and other mammals of similar size behave much differently
than insects....(added 11/05) |
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Hand Clap Electronic Control - We have all seen the commercial on
TV....CLAP, ON, CLAP, OFF, THE, CLAPPER....well here is a circuit that will perform
that same function… [Randy Linscott] |
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Hand clap lamp control - Hand Clap Lamp/Appliance Control - Clap once for ON
and twice for OFF I think [Reverse engineered schematic by Stepan Novotill] |
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Perimeter Monitor - Using a single cable such as speaker wire or doorbell
cable, this circuit can be remotely positioned, for example, at the bottom of a garden
or garage, and used to detect all sound in that area. The cable can be buried in a
hosepipe or duct and is concealed out of sight. The mic is an ordinary dynamic mic
insert.... [Circuit design by Andy Collison] |
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Sound Operated / Sound
Activated Circuits: #'s - P
Q - T
U - Z |
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