circuits to sense sounds and then take action, or signal so something else can take action http://www.reconnsworld.com/forum/list.php?11 Wed, 08 Sep 2010 23:26:14 -0700 Phorum 5.2.9a http://www.reconnsworld.com/forum/read.php?11,269,269#msg-269 http://www.reconnsworld.com/forum/read.php?11,269,269#msg-269 Need a transmitter on one end and a receiver/speaker/LED on the other.
Any help would be appreciated..]]> rybodelerium Sound Detectors Sun, 10 Apr 2005 19:13:14 -0700 http://www.reconnsworld.com/forum/read.php?11,236,236#msg-236 http://www.reconnsworld.com/forum/read.php?11,236,236#msg-236 OpinDJ Sound Detectors Thu, 06 Jan 2005 02:59:34 -0800 http://www.reconnsworld.com/forum/read.php?11,40,40#msg-40 http://www.reconnsworld.com/forum/read.php?11,40,40#msg-40

Beamsonic is a circuit which apparently listens for sounds and sets off a remote beeper when a threshold sound level is reached. Cold be used in a situatio where you want to be notified of someone or something moving in a monitored area like a store or warehouse.]]> andrew Sound Detectors Mon, 21 Aug 2006 14:59:36 -0700 http://www.reconnsworld.com/forum/read.php?11,17,17#msg-17 http://www.reconnsworld.com/forum/read.php?11,17,17#msg-17

parts:
U1 NE567 IC
R1 50k ohm 3 to 15-turn precision potentiometer
R2 1k ohm resistor
C1 0.022uF monolithic of Hi-Q ceramic capacitor
C2 0.02uF ceramic capacitor
C3 0.005uF ceramic capacitor
C4 1uF ceramic capacitor

all resistors are 5 or 10 percent tolerance, 1/4-watt
all capacitors are 10 percent tolerance,
rated 35 volts or higher
this is also designed to be in conjunction with the sound detector amp/electret mike amp. this circuit is designed to trigger on a 1 khz tone. to change this frequency - refer to the table below, then change the resistor and capacitor values accordingly..

Center frequency of LM567

R1------C1=0.0047---C1=0.01---C1=0.022
470ohm-411.54-------193.42----87.92
1k------193.42-------90.91-----41.32
1.5k----128.95-------60.61-----27.55
2.2k----87.92--------41.32-----18.78
3.3k----58.61--------27.55-----12.52
4.7k----41.15--------19.34-----8.80
5.6k----34.54--------16.23-----7.38
10k-----19.34--------9.09------4.13
22k-----8.79---------4.13------1.88
33k-----5.86---------2.75------1.25
47k-----4.12---------1.93------879 Hz
100k----1.93---------910 Hz----413 Hz
220k----880 Hz-------413 Hz----188 Hz
All frequencies in kHz unless otherwise noted;
capacitance in uF



]]> andrew Sound Detectors Tue, 23 Nov 2004 00:27:57 -0800 http://www.reconnsworld.com/forum/read.php?11,16,16#msg-16 http://www.reconnsworld.com/forum/read.php?11,16,16#msg-16

parts:
U1 NE555 timer IC
R1 1k resistor
R2 50k potentiometer
C1 0.1uF ceramic capacitor
C2 10uf tantalum capacitor

all resistors are 5 or 10 percent tolerance, 1/4-watt
all capacitors are 10 percent tolerance,
rated 35 volts or higher

for use with the sound detector circuit/electret mike amplifier. when the 555 ic goes into timing mode (triggered by an output signal from the sound detector amplifier,) the timer's output (pin 3) is set into HIGH for a duration set by C2, and R2. adjusting R1 will adjust how long it listens, from 10 seconds all the way down to 2/10ths of a second. this could be used to listen for hand claps.]]> andrew Sound Detectors Sun, 19 Dec 2004 11:59:01 -0800