S Suraj143 Active Member Apr 19, 2013 #1 Guys I want to make a fire alarm sound.The below circuit I made & it works. The only problem is its tone is in high pitch,I need a more weight tone as fire siren modules has. How to get more low frequency tone? Attachments fire alarm.JPG 21.7 KB · Views: 168
Guys I want to make a fire alarm sound.The below circuit I made & it works. The only problem is its tone is in high pitch,I need a more weight tone as fire siren modules has. How to get more low frequency tone?
ronsimpson Well-Known Member Most Helpful Member Apr 19, 2013 #2 Suraj143 said: How to get more low frequency tone? Click to expand... If you want a lower frequency try replacing the 200k ohm resistor with a higher value. Example a 400k resistor will probably drop the time by one octave. A 330k is a good place to start.
Suraj143 said: How to get more low frequency tone? Click to expand... If you want a lower frequency try replacing the 200k ohm resistor with a higher value. Example a 400k resistor will probably drop the time by one octave. A 330k is a good place to start.