I placed this project before and did not follow advice and sent payment for this project outside Freelancer directly to the winning [url removed, login to view] has since refunded me 100.00 but The job was not done so I will place this project again.
I do have a diagram of a simple circuit using a transistor.(BC558) The diagram does not provide any diodes to protect the transistor so you may have a better way.
Needs of the alarm:FIRST OF ALL I DO NOT WANT JUST A DIAGRAM, I WANT A PHYSICAL ALARM.
(1) Description of operation:
The alarm needs to be a normally closed circuit, which would alarm if the wire were cut. A wire loop made of insulated wire, would be intertwined with the vents in the covers.
Should this be cut, the alarm would sound until the battery went dead. I don’t believe the wire gage it would use is important because of it being battery powered.
(2) Component needs:
(a) It is important for the alarm to use a readily available and cheap IC like a 555 IC or a transistor like a BC558.
(b) It must have a loud alarm, 132 decibel like found in personal alarms.
(c) The alarm would need to be battery powered by a physically small battery, maybe a 9 volt battery.
(d) The box containing the alarm must be as small as possible and the case needs to be easily obtainable and cheap. All must fit in a plastic containment of 5 inches by 5 inches or LESS.
The alarm would be mounted in an area where there are already electronics components which are protected from the weather, so the container of the circuit is not subjected to the elements, but is subjected to vibration and heat up to 110-120 F.
(e) The place where the wire loop attaches needs to have two terminals with metal screws or “screw-downs for “loop wire” (could be like the ones used for stereo speakers) (when wire is cut alarm will sound) I will be using possibly a gauge of wire like insulated telephone wire (#24 gauge) or slightly larger
(f) This must have a “test” button button (push=on; release=off) and a way to cancel alarm by the owner. (micro-switch push=on , push=off) or tiny toggle switch
(g) short alarm for low battery
(h) very low battery drain while circuit is in alarm-off mode
(i) The components must be cheap and easily obtainable costing no more than $5.00 total
Our budget for this project is 300.00.I will need three duplicate alarms sent to me by priority mail.
Also, I must have complete instructions concerning construction so I may build it myself.
If you would like to know me by reputation look at my Ebay ID My Ebay ID is blupkwy.I was one of the original sellers on Ebay and was a Power Seller for many years.I thank you in advance for your help.
Using a 555 ic is not written in stone, you could suggest a better,cheaper method.I do want the loud alarm(at least 130 decibel) and all components in the same container.
Do not worry about getting paid, I honor my commitments,you will get paid promptly.
I can design this circuit and build required prototypes. I have an excellent knowledge in this area after working for a large UK company making this type of product.
21 freelancers are bidding on average $340 for this job
I am automation engineer wth 32 years of experience supported by two elecronics engineers. Caould give you the tested product. Brajesh
Hi, I have excellent experience with electronics hardware and software design. I am very much sure that I can do it. The bid does not include shipping cost. As a cheaper option I can provide I can provide complet Daha Fazla
Hi, I can design this alarm with a cheap microcontroller in 14 days. Shipping cost will be extra for the prototypes. I have 19 years of design experience in Analog and digital electronics and microcontroller b Daha Fazla
Iam electronic circuit designer,I had finished car alarm product that used mobile phone to contact with ownner,your project is simple ,i will happy if i can help you,i has addition alarm idea for you,thanks,blupkwy
Like I already told you, I can do it. Please, see PM.
I am an Electronics Engineer esp. in Instrumentation, Telecomm., and microprocessor system design. Awaiting your positive answer
i am 24 hour far from u. i.e. i m from Nepal. i can just make a simulator diagram in Proteus, Livewire or in workbench.i can also send u details about the components, and the schematics. in your project the alarm f Daha Fazla
I can do this project within 15days Shipping fees wil be added
I can make this project exactly to your requirements. Lets do it! Please see PMB
Hello. I am an Electronic Engineer. Please let me get the job. I will do it effectively.
My bid is simply covering all what you mentioned, without any additional costs. Check your PMB.