J
jamesgangnc
Guest
I knew I'd get some grief about this but was hoping someone would help with parts and circuit suggestions.
The neighbor in question has been a problem for a long time. The only noise laws we have on the books are designated hours at night. They simply take the dogs in then. The allowable daylight hours are pretty broad and make no consideration for weekends. Besides, how enjoyable is being out on you deck in the afternoon with friends only to have dog barking interrupt you constantly? I'm at the end of a street and we all have big lots. The nieghbor on the other side of me and the neighbor on the other side of the problem don't have dogs. There is a public trail running through the wood behind us. It makes the situationn worse because the dogs bark at every one jogging or walking on that trail until they are out of sight. We have a cat so we're not without some sympathy for animals. But let's be realistic, thousands of unwanted cats and dogs are simply killed every day. They are just animals. Millions of other animals are killed daily just for us to eat.
I know I can find lots of simple class ab power amp circuits on the internet. But I would need to make a power supply for them. The power limit is the power supply and it gets expensive to make a power supply for high watt amps. So that's why I wanted to figure out a way to use the high amp 5v power supply I've already got.
"jamesgangnc" <james@nospam.com> wrote in message news:13r5u732kdes0e1@corp.supernews.com...
I want to build the killer of all dog bark stoppers. (Sorry to any dog lovers but we have neighbors with two dogs that they leave in a fenced yard and they bark at anything that happens within a 1/2 mile day or night.) I already have a device I bought that is tripped by barking and has a couple piezo tweeters in it. Not enough power though. I've got a power supply I salvaged out of some com gear that does 70 amps of +5 so I was thinking I could use some high current power transistors to run a whole bunch of those cheap piezo tweeters in parallel. I can adapt existing circuits and combine designs but designing from scratch is a little beyond my skills. Also I need parts suggestions for the power transistor. I know I need an amp design that has a lot of current gain, not voltage gain. And something I can run several of the amp circuits in parallel if I need to. I was planning to drive it from the output circuit of the existing bark stopper unit if I can. Otherwise if I need to I can interject some opamps (741s) or common low power transistors like the 2n2222 or 2n2907s to drive. I have a old tectronix 5mhz scope and digital multi-meter and a collection of basic parts. Figuring I'll have to get the power transistors from newark.
I'd previously been thinking about running a bunch of the piezoes in series and using the 115v mains directly into dc with some sort of high voltage amp circuit but then this 70 amp 5v power supply came along. Figured it's be a lot safer that rectified mains.
Anyone want to give me some pointers?
The neighbor in question has been a problem for a long time. The only noise laws we have on the books are designated hours at night. They simply take the dogs in then. The allowable daylight hours are pretty broad and make no consideration for weekends. Besides, how enjoyable is being out on you deck in the afternoon with friends only to have dog barking interrupt you constantly? I'm at the end of a street and we all have big lots. The nieghbor on the other side of me and the neighbor on the other side of the problem don't have dogs. There is a public trail running through the wood behind us. It makes the situationn worse because the dogs bark at every one jogging or walking on that trail until they are out of sight. We have a cat so we're not without some sympathy for animals. But let's be realistic, thousands of unwanted cats and dogs are simply killed every day. They are just animals. Millions of other animals are killed daily just for us to eat.
I know I can find lots of simple class ab power amp circuits on the internet. But I would need to make a power supply for them. The power limit is the power supply and it gets expensive to make a power supply for high watt amps. So that's why I wanted to figure out a way to use the high amp 5v power supply I've already got.
"jamesgangnc" <james@nospam.com> wrote in message news:13r5u732kdes0e1@corp.supernews.com...
I want to build the killer of all dog bark stoppers. (Sorry to any dog lovers but we have neighbors with two dogs that they leave in a fenced yard and they bark at anything that happens within a 1/2 mile day or night.) I already have a device I bought that is tripped by barking and has a couple piezo tweeters in it. Not enough power though. I've got a power supply I salvaged out of some com gear that does 70 amps of +5 so I was thinking I could use some high current power transistors to run a whole bunch of those cheap piezo tweeters in parallel. I can adapt existing circuits and combine designs but designing from scratch is a little beyond my skills. Also I need parts suggestions for the power transistor. I know I need an amp design that has a lot of current gain, not voltage gain. And something I can run several of the amp circuits in parallel if I need to. I was planning to drive it from the output circuit of the existing bark stopper unit if I can. Otherwise if I need to I can interject some opamps (741s) or common low power transistors like the 2n2222 or 2n2907s to drive. I have a old tectronix 5mhz scope and digital multi-meter and a collection of basic parts. Figuring I'll have to get the power transistors from newark.
I'd previously been thinking about running a bunch of the piezoes in series and using the 115v mains directly into dc with some sort of high voltage amp circuit but then this 70 amp 5v power supply came along. Figured it's be a lot safer that rectified mains.
Anyone want to give me some pointers?