jacob.zurasky
New Member
Hello, I have a problem that I cant seem to figure out yet. I have an electret mic hooked up to a lm324 to give my pic a voltage 0-5v depending on sound level. The circuit works perfectly when running from a 9v battery. I switched to a AC adapter and a 7809 to supply the 9 volts. Now the output fluctuates up and down several volts, but sound still causes the level to rise. There are several capacitors around the 7809 and a 0.1uf cap right next to the lm324. I will post some schematics later so you can see exactly how it is configured. Im more of a digital person, so this is not my specialty. -Thanks jacob