alarm motocykl

horn Circuit for motorcycle use

Gates Ul-a and Ul-b of the 4093 ąuad 2-input NAND Schmitt trigger are connected in variable, low-freąueney, square-wave oscillator circuits. The output of gate U 1-a is connected to one of the inpuls of gate Ul-b. The square-wave output of gate Ul-a modulates oscillator Ul-b, producing a two-tone output. A really interestmg sound can be produced by carefuUy adjusting po-tentiometers R1 and R2.