Let me start by saying I am not an electrical engineer, I am a nurse. However, electronics has always been a hobby of mine. I know some...but not enough. On that note...I also have two dogs that bark...and a neighbor that barks more. We have tried so many things, but the ultrasonic dog bark machine seemed to work the best. I am just trying to improve on the function by making it a little more dynamic (adjustable volume, sensitivity, frequency, etc.)
So I designed and built this circuit. It works pretty well. I have been testing it with 6v (4 AA's) and it generates a pretty loud squeal. (I intentionally made the oscillator adjustable to within hearing range for testing purposes.) However, the speaker is a piezo tweeter GT-1005 similar to a KSN1005, and I feel I could really get some more power out of it. Any help improving this circuit, particularly the output would be much appreciated.
Thanks,
Chris
Circuit description: Electret microphone signal amplified by lm386 trips monostable 555 (timer) which activates 555 oscillator. Output fed to Tip31 NPN.
So I designed and built this circuit. It works pretty well. I have been testing it with 6v (4 AA's) and it generates a pretty loud squeal. (I intentionally made the oscillator adjustable to within hearing range for testing purposes.) However, the speaker is a piezo tweeter GT-1005 similar to a KSN1005, and I feel I could really get some more power out of it. Any help improving this circuit, particularly the output would be much appreciated.
Thanks,
Chris
Circuit description: Electret microphone signal amplified by lm386 trips monostable 555 (timer) which activates 555 oscillator. Output fed to Tip31 NPN.