noise makers, anything that generates tones, or sounds.. http://www.reconnsworld.com/forum/list.php?12 Wed, 08 Sep 2010 23:36:08 -0700 Phorum 5.2.9a http://www.reconnsworld.com/forum/read.php?12,501,501#msg-501 http://www.reconnsworld.com/forum/read.php?12,501,501#msg-501
I'm new at this fórum. I'm not good at electronics, but I like to make some gadgets at home.

I'm trying to find, in the WEB, some circuits to produce 16 Khz Ultrasound. I'm planning to make a gadget with it.

I, only, found a circuit to produce 40 to 50 Khz Ultrasound, but I think it is very high for my project.

Can anyone help to find it?

Thanks. Sorry about my english. It isn't very good.

Pedro]]> pedro Sound Generators Tue, 22 Jan 2008 15:15:55 -0800 http://www.reconnsworld.com/forum/read.php?12,379,379#msg-379 http://www.reconnsworld.com/forum/read.php?12,379,379#msg-379 :smile: does anyone have a simple circuit for one of these???to replicate dalek sounds etc..]]> SHELDONS TV Sound Generators Mon, 02 Jan 2006 07:26:29 -0800 http://www.reconnsworld.com/forum/read.php?12,234,234#msg-234 http://www.reconnsworld.com/forum/read.php?12,234,234#msg-234 hotwaterwizard@aol.com Sound Generators Sun, 19 Dec 2004 12:01:04 -0800 http://www.reconnsworld.com/forum/read.php?12,30,30#msg-30 http://www.reconnsworld.com/forum/read.php?12,30,30#msg-30

parts:
U1, U1 NE555 timer IC
R1 1 megohm potentiometer
R2 1 1k resistor
C1 0.001uf ceramic capacitor
C2 0.1uF ceramic capacitor
SPKR1 4 or 8 ohm miniature speaker

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

this tone generator can be used to control your robot. you will need to use the tone decoder for this. to widen the range, higher or lower - substitute a higher, or lower valued capacitor for c1. for frequencies about 5khz and 15khz, use a piezoelectric element as the speaker. Use a miniature speaker for frequencies under 5khz, and use an ultrasonic transducer for frequencies over 30khz.]]> andrew Sound Generators Fri, 30 Sep 2005 06:27:43 -0700 http://www.reconnsworld.com/forum/read.php?12,18,18#msg-18 http://www.reconnsworld.com/forum/read.php?12,18,18#msg-18

parts:
U1, U2 NE555 timer IC
R1, R4 10k ohm resistor
R2, R5 1 mega-ohm resistor
R3 47k ohm resistor
C1 0.22uF ceramic capacitor
C2 0.1uF 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 circuit provides a good siren noise suitable for warding off robot-predators! Change the pitch by adjusting R2, and R5.]]> andrew Sound Generators Thu, 26 Jun 2003 18:46:25 -0700