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Add Voice Command To Virtual Instrumentation - 05/02/02 EDN-Design Ideas: (design
idea added 1/05) |
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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…(added 5/02) |
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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
....(added 4/02) |
| Scanmate Audio Activated Recorded - (Tony van Roon's
schematic / circuit added 10/02) |
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Set your lights to music - 08/06/09 EDN This circuit activates six ac
outlets according in a logarithmic thermometer-code format, causing six to 12 strings
of lights to flash on and off according to the level and tempo of music you are
playing.....(design idea added 08/09) |
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Sound Activated Toy - This circuit makes a flower bop to the beat of music. The
flower stem contains a crooked wire which is spun by the motor. The circuit is a
microphone driven peak-detecting one-shot and works very well. The microphone is in a
sponge mount to insulate it from the vibration of the running motor. Similar circuits
are used to drive rock'n coke cans (added 2/05) |
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Sound Controlled Flip Flop - Described here is a very inexpensive solution to many
phono-controlled applications like remote switching on, for instance, or activating a
camera, tape recorder, burglar alarms, toys, etc. The circuit given here employs a
condenser microphone as the pick-up. A two-stage amplifier built around a quad op-amp
IC LM324 offers a good gain to enable sound pick-up upto four metres. …. (added
10/05) |
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Sound Operated Switch - This sensitive sound operated switch can be used with a
dynamic microphone insert as above, or be used with an electret (ECM) microphone. If
an ECM is used then R1 (shown dotted) will need to be included. A suitable value would
be between 2.2k and 10kohms. The two BC109C transitors form an audio preamp, the
gain.... (added 2/06) |
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Sound triggered flash - If you wish to take a picture of a fleeting event which
generates a sound, you can do it with this sound activated trigger. It does not
require any power supply: it feeds on the high voltage available on the flash trigger
terminal. Any economic ceramic microphone is suitable for the purpose....(added 9/07) |
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Ultrasonic Dog Whistle - (electronic design added 9/02) |
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Voice activated switch - The VS-1 provides quality components and a compact
printed circuit board that makes it a snap to “turn on” a multitude of devices, from
HAM transmitters and amps to tape recorders or clandestine listening
equipment.....HAVE FUN! ....(electronic design added 6/07) |
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Voice Record/ Playback Circuit - The ISD1000A is a Direct Analog Storage
device which allows you to store 20 seconds worth of voice data on an IC chip which
can be play backed anytime. The data stored will stay in memory even if the power is
removed. To use the circuit below simple apply power to the circuit, press the record
button and hold. Speak clearly into the microphone. You have up to 20 seconds….(added
08/08/08) |
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Wave Multiplier for music Synthesizers - (electronic circuit added 4/05) |
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Weird Sound Generator - (electronic circuit added 08/08/08) |
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Whistle On - Whistle Off - This is an extension of the CMOS toggle flip flop
circuit shown in the "Circuits controlling relays" section with the addition of two
bandpass filters and condenser microphone so the relay can be toggled by whistling at
it. The condender mic used is a PC board mount Radio Shack #270-090C. The filters are
tuned to about 1700 Hz, or the third Ab above middle C on a piano keyboardr....(added
05/06) |
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Whistle on Whistle Off - This CMOS toggle flip flop circuit has an addition
of2bandpass filters and condenser microphone so the relay can be toggled by whistling
at it. (added 5/02) |
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Whistle Responder - Beeps when hears your whistle A gadget suitable for
key-holders, games etc. (added 9/04) |
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Whistle Switch - (electronic schematic / circuit added 4/02) |
