Post by thread:cats!

I once hooked a crystal earphone element up to my signal generator to see what the cat could hear. She could hear up to about 28Khz. My methods weren all that exact, but I tried several frequencies and pulsed the output on and off to see if it would get her attention. 25Khz seemed to get her attention pretty well. I have no idea if she hates it or not. Of course 120dbs of sound pressure at 25hz might do the trick! (and drive all living creatures insane for a 100 yard radius!) Dan On Thu, 9 Sep 1999 14:39:05 EDT, Kev Howard wrote: >Does anyone know what frequencies Cats hate? > >Its more humane than letting the dog have a free dinner! > >Thanks > >Kev >

>Of course 120dbs of sound pressure at 25hz >might do the trick! (and drive all living creatures >insane for a 100 yard radius!) Welcome to Waco. And Panama. And other sites around the world. It's a common technique used by the military. Andy ================================================================== Eternity is only a heartbeat away - are you ready? Ask me how! ------------------------------------------------------------------ spam_OUTandyTakeThisOuTrc-hydros.com http://www.rc-hydros.com - Race Boats .....andyKILLspam@spam@montanadesign.com http://www.montanadesign.com - Electronics ==================================================================

i one................... used a neon sign xformer wired to the fire escape and ground..well the trash can was isolated too and wired....... call it the CAT'S MEOW!!!!!!!! OMG..... woke the neighbors up in the middle of the night...<G> sorry.. but was really tired of those darn cats prowling around in the trash... it was triggered by the pir infraed sensor...(works great for burgulars too ..people that wasn't supposed to be there) slight shock 150 ma @ 15 kv..............fused....1/2 amp........it stopped the cat's CAUTION DO NOT ATTEMPT THIS AT HOME...... ONLY TO BE USED UNDER CONTROLLED CONDITIONS...... hehe,,,, -----Original Message----- From: Kev Howard <KHo9196475spam_OUTAOL.COM> To: @spam@PICLISTKILLspamMITVMA.MIT.EDU <KILLspamPICLISTKILLspamMITVMA.MIT.EDU> Date: Thursday, September 09, 1999 10:40 PM Subject: Re: cats! >Hello Peter >Just want to scare them off via their ears not fry them! > >240v here! fry them quicker! > >regards > >Kev >

In a message dated 9/9/99 4:04:02 PM Pacific Daylight Time, RemoveMEstm800TakeThisOuTCITY-NET.COM writes: << i one................... used a neon sign xformer wired to the fire escape and ground..well the trash can was isolated too and wired....... call it the CAT'S MEOW!!!!!!!! OMG..... woke the neighbors up in the middle of the night...<G> sorry.. but was really tired of those darn cats prowling around in the trash... it was triggered by the pir infraed sensor...(works great for burgulars too ..people that wasn't supposed to be there) slight shock 150 ma @ 15 kv..............fused....1/2 amp........it stopped the cat's CAUTION DO NOT ATTEMPT THIS AT HOME...... ONLY TO BE USED UNDER CONTROLLED CONDITIONS...... hehe,,,, >> I had to say this: I love it!

I do wonder what the idea of fusing it at 500mA is! That is certainly a LOT more than is necessary to kill a cat,or a human for that matter. Also, I hope the term "slight shock" in reference to 150mA is sarchastic,because that is also more than a lethal level of current. For a person, IIRC, 1 or 2 mA is considered maximum safe level (and this is only from a medical standpoint, it is NOT considered safe to allow that much to flow thru a person on purpose). By touching the case of an old scope, I found out that I can actually slightly feel only a few 100uA (the transformer-to-case isolation must have been less than it should be,another strong argument for isolation transformers!) Something like 4mA is pain threshold, 20mA strong muscle contractions, 50mA heart rhythm disruption, 100mA death likely. This also depends on the path the current takes. I find it AMAZING that defibrilators are designed to push something like 10A thru a person! I wouldn't have thought it possible to do so without REALLY high voltages and large burns. In short,I hope you didn't really do this because a little kid could probably get killed by something like this. Sean At 09:30 PM 9/9/99 EDT, you wrote: >In a message dated 9/9/99 4:04:02 PM Pacific Daylight Time, >spamBeGonestm800spamBeGoneCITY-NET.COM writes: > ><< i one................... used a neon sign xformer wired to the fire escape {Quote hidden}> and ground..well the trash can was isolated too and wired....... > call it the CAT'S MEOW!!!!!!!! > OMG..... woke the neighbors up in the middle of the night...<G> sorry.. > but was really tired of those darn cats prowling around in the trash... > it was triggered by the pir infraed sensor...(works great for burgulars too > ..people that wasn't supposed to be there) slight shock 150 ma @ 15 > kv..............fused....1/2 amp........it stopped the cat's > CAUTION DO NOT ATTEMPT THIS AT HOME...... > ONLY TO BE USED UNDER CONTROLLED CONDITIONS...... > hehe,,,, >> >I had to say this: I love it! > | | Sean Breheny | Amateur Radio Callsign: KA3YXM | Electrical Engineering Student \--------------=---------------- Save lives, please look at http://www.all.org Personal page: http://www.people.cornell.edu/pages/shb7 TakeThisOuTshb7EraseMEspam_OUTcornell.edu ICQ #: 3329174

This depends very much on circumstances sometimes defying logic or explanation as a teenager I grabbed the two poles of a 3kg heavy neon transformer...7kv @100ma... you would assume since current flowed from hand to hand, path over the chest this should be deadly..... it was not. I did not manage to release the poles but after about 15 seconds managed to kick the plug out of the outlet. I survived , shaken , but unharmed. Peter van Hoof ------------- pvhEraseME.....vertonet.com http://go.to/pvh [snip] {Quote hidden}> more than is necessary to kill a cat,or a human for that matter. Also, I > hope the term "slight shock" in reference to 150mA is sarchastic,because > that is also more than a lethal level of current. > > For a person, IIRC, 1 or 2 mA is considered maximum safe level > (and this is > only from a medical standpoint, it is NOT considered safe to allow that > much to flow thru a person on purpose). By touching the case of an old > scope, I found out that I can actually slightly feel only a few 100uA (the > transformer-to-case isolation must have been less than it should > be,another > strong argument for isolation transformers!) Something like 4mA is pain > threshold, 20mA strong muscle contractions, 50mA heart rhythm disruption, > 100mA death likely. This also depends on the path the current > takes. I find > it AMAZING that defibrilators are designed to push something like 10A thru > a person! I wouldn't have thought it possible to do so without REALLY high > voltages and large burns. > > In short,I hope you didn't really do this because a little kid could > probably get killed by something like this. .

Hi Peter, I agree that electronics often appears to defy logic,but did you actually measure the current? Just because the supply is capable of 100mA doesn't mean that 100mA actually went through you. Hand-to-hand "resistance" varies greatly. With my ohmmeter testing myself, I can get it to go as low as about 200k with sweaty hands and a firm grip,and almost arbitrarily high if I lightly touch it. I realize that due to electrochemical effects,this would be different for higher voltages,but it would still vary. 7kv/200k = 35mA,so as you can see,it is quite likely that you didn't in fact experience a 100mA current. You probably understand this fully,and are just making the point that what shock you actually receive depends on the circumstances and you are quite right. I just find it annoying that some people will make statements like "Car batteries can source 100's of amps so they can easily kill you",when in fact much less than 100A is necessary to be lethal. It all depends on the current that actually goes through you,which depends entirely on circumstances,which aren't even really ohmic (due to the complex composition of various tissues). Sean At 10:16 PM 9/9/99 -0400, you wrote: {Quote hidden}>This depends very much on circumstances sometimes defying logic or >explanation >as a teenager I grabbed the two poles of a 3kg heavy neon transformer...7kv >@100ma... >you would assume since current flowed from hand to hand, path over the chest >this should be deadly..... it was not. I did not manage to release the poles >but after about 15 seconds managed to kick the plug out of the outlet. > >I survived , shaken , but unharmed. > >Peter van Hoof >------------- >EraseMEpvhvertonet.com >http://go.to/pvh > >[snip] >> more than is necessary to kill a cat,or a human for that matter. Also, I >> hope the term "slight shock" in reference to 150mA is sarchastic,because >> that is also more than a lethal level of current. >> >> For a person, IIRC, 1 or 2 mA is considered maximum safe level >> (and this is >> only from a medical standpoint, it is NOT considered safe to allow that >> much to flow thru a person on purpose). By touching the case of an old >> scope, I found out that I can actually slightly feel only a few 100uA (the >> transformer-to-case isolation must have been less than it should >> be,another >> strong argument for isolation transformers!) Something like 4mA is pain >> threshold, 20mA strong muscle contractions, 50mA heart rhythm disruption, >> 100mA death likely. This also depends on the path the current >> takes. I find >> it AMAZING that defibrilators are designed to push something like 10A thru >> a person! I wouldn't have thought it possible to do so without REALLY high >> voltages and large burns. >> >> In short,I hope you didn't really do this because a little kid could >> probably get killed by something like this. >. > | | Sean Breheny | Amateur Radio Callsign: KA3YXM | Electrical Engineering Student \--------------=---------------- Save lives, please look at http://www.all.org Personal page: http://www.people.cornell.edu/pages/shb7 RemoveMEshb7EraseMEEraseMEcornell.edu ICQ #: 3329174

Hi Tim, I saw your disclaimer,but it just said that you didn't recommend that others try this. I was just trying to warn you about how very dangerous something like this is. I think you would probably be liable even if it were a burglar,since they would get it before they were inside your house. In addition, I just don't think you can assume that no innocent people will get killed this way. IMHO, "controlled circumstances" means continuous observation when it comes to un-enclosed HV. It just seems to me that there are safer ways to deter cats. Sean At 10:20 PM 9/9/99 -0000, you wrote: {Quote hidden}>did i not say at the end of message PLEASE DO NOT TRY THIS AT HOME ONLY >FOR PROFESSIONALS UNDER CONTROLLED CIRCUMSTANCES.......MY DISCLAMER..... i >understand.about children they get very courious but the thing only turns on >when it is dark ( kids r to be in bed ) and it is part of a warning scheme >... also a pic monitors all thru ccd infra cam nite >vision...........recorded into a v c r.... >sorry but some teen agers don't get messages very well............ >not my fault........so got rid of the cat's my primary objective........ > | | Sean Breheny | Amateur Radio Callsign: KA3YXM | Electrical Engineering Student \--------------=---------------- Save lives, please look at http://www.all.org Personal page: http://www.people.cornell.edu/pages/shb7 RemoveMEshb7spam_OUTKILLspamcornell.edu ICQ #: 3329174

Paul, didn't you really mean that to be a positive statement? Like: "I find it quite LIKELY",etc. It seems like that from the rest of the sentence. On this, I have to stand corrected once again. I knew that this wouldn't be a truly ohmic situation,but I forgot about arcing through the skin at such a high voltage. SO, I guess it would have delivered the full current (limited just by the supply itself). Nothing like the PICLIST to help one with the virtue of humility <G>. Yes,indeed,you were very lucky, Peter. Sean At 02:39 PM 9/10/99 +1000, you wrote: {Quote hidden}> I find it quite unlikely that at that (open-circuit) voltage, it would >deliver its full current limit, since it would easily arc *through* any >skin resistance and body resistance is only in the order of hundreds of >ohms. > > It's an interesting story of a very *lucky* Van Hoof. I'll bet he was >sporting burns for a while. >-- > Cheers, > Paul B. > | | Sean Breheny | Amateur Radio Callsign: KA3YXM | Electrical Engineering Student \--------------=---------------- Save lives, please look at http://www.all.org Personal page: http://www.people.cornell.edu/pages/shb7 RemoveMEshb7TakeThisOuTspamcornell.edu ICQ #: 3329174

>>Just want to scare them off via their ears not fry them! > >Use a motion sensor to turn on a sprinkler. Now you may need a way to tell >the difference between a cat and a kid! (maybe you could use a Pic). Why my kids would love a motion activated sprinkler. :) An electric fence found on the farm works nicely. Non-leathal and kids are only curious about it ONCE!! If you build a PIC based version let me know. I'll work on it with you. I need to keep mice out of my MG. I was in a friends basement as he was searching for something or other. He came across an old style 24 hr format mechanical digital clock. He pulled the clock off the shelf a nd asked his 6 year old son if he wanted to play with it. The kid dissapeared faster than the R oad Runner just before the coyote was foiled by his latest scheme. Apparently, one day the boy r eceived a 120VAC shock while playing with it and just the sight of it scared him. - -Mark P.S. Please don't wiz on the electric fence! =:0 __________________________________________________ Do You Yahoo!? Bid and sell for free at http://auctions.yahoo.com

In message <010701befb20$35576dc0$37d766cf@ken>, Ken Kaarvik <RemoveMEKen_KaarvikKILLspamBC.SYMPATICO.CA> writes >>Just want to scare them off via their ears not fry them! > >Use a motion sensor to turn on a sprinkler. Now you may need a way to tell >the difference between a cat and a kid! (maybe you could use a Pic). Visit your local zoo or Safari Park and buy some lion droppings, all cats mark their territory, and lion droppings placed strategically warn smaller cats to keep away. There's recently been a series on UK TV called 'Lion Country', about a safari park, and they showed this actually in use - they followed a guy home who had lots of cats ruining his lawn, he placed the droppings and the cats wouldn't come closer than the other side of the road :-). -- Nigel. /--------------------------------------------------------------\ | Nigel Goodwin | Internet : nigelgSTOPspamspam_OUTlpilsley.demon.co.uk | | Lower Pilsley | Web Page : http://www.lpilsley.demon.co.uk | | Chesterfield | Official site for Shin Ki and New Spirit | | England | Ju Jitsu | \--------------------------------------------------------------/

Exactly what model of PIC controller were you going to add to this project? /Bo -----Original Message----- From: pic microcontroller discussion list [spamBeGonePICLISTSTOPspamEraseMEMITVMA.MIT.EDU]On Behalf Of Quentin Sent: Saturday, September 11, 1999 1:34 PM To: KILLspamPICLISTspamBeGoneMITVMA.MIT.EDU Subject: Re: cats! Nigel Goodwin wrote: > Visit your local zoo or Safari Park and buy some lion droppings, all > cats mark their territory, and lion droppings placed strategically warn > smaller cats to keep away. Now I wonder which smell the worst. Lion droppings or cat droppings? Hey Tjaart, we can start a new business here in Africa! Shall we start the bid at say $1.00 a dropping? Freshly packed. Special for today: Free if you go fetch it yourself! Quentin

Tsk, Tsk. How dare you suggest a low tech solution <bg> ! And a clever one at that ! Eric On Friday, September 10, 1999 1:21 AM, Nigel Goodwin [SMTP:EraseMEnigelgEraseMELPILSLEY.DEMON .CO.UK] wrote: {Quote hidden}> In message <010701befb20$35576dc0$37d766cf@ken>, Ken Kaarvik > <@spam@Ken_Kaarvik@spam@spam_OUTBC.SYMPATICO.CA> writes > >>Just want to scare them off via their ears not fry them! > > > >Use a motion sensor to turn on a sprinkler. Now you may need a way to tell > >the difference between a cat and a kid! (maybe you could use a Pic). > > Visit your local zoo or Safari Park and buy some lion droppings, all > cats mark their territory, and lion droppings placed strategically warn > smaller cats to keep away. There's recently been a series on UK TV > called 'Lion Country', about a safari park, and they showed this > actually in use - they followed a guy home who had lots of cats ruining > his lawn, he placed the droppings and the cats wouldn't come closer than > the other side of the road :-). > -- > > Nigel. > > /--------------------------------------------------------------\ > | Nigel Goodwin | Internet : spamBeGonenigelgKILLspamlpilsley.demon.co.uk | > | Lower Pilsley | Web Page : http://www.lpilsley.demon.co.uk | > | Chesterfield | Official site for Shin Ki and New Spirit | > | England | Ju Jitsu | > \--------------------------------------------------------------/