Schematics Depot >> Audio >> warbler

warbler siren:

U1, U2NE555 timer IC
R1, R410k ohm resistor
R2, R51 mega-ohm resistor
R347k ohm resistor
C10.22uF ceramic capacitor
C20.1uF 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.
Return to: Schematics Depot, or Audio Circuits

Site by Andrew Wilson. Copyright 1997-2006 All Rights Reserved unless otherwise noted.
Schematics in Schematics Depot were found on the internet and assumed to be in public domain. Contact webmaster if the copyright holder wants them pulled for any reason.