Welcome to our site!

Electro Tech is an online community (with over 170,000 members) who enjoy talking about and building electronic circuits, projects and gadgets. To participate you need to register. Registration is free. Click here to register now.

  • Welcome to our site! Electro Tech is an online community (with over 170,000 members) who enjoy talking about and building electronic circuits, projects and gadgets. To participate you need to register. Registration is free. Click here to register now.

anyone have experience with an EAS system

Status
Not open for further replies.

MrDEB

Well-Known Member
My cheapo brother bought an EAS (electronic article surveillance ) setup from China.
FIRST the directions are broken English
not very descriptive (don't even show how to connect power (bro said it could be connected in 5 different ways?) Probally why it smoked at first try.
He actually got it working but some tags would not set the alarm off.
I wonder if the DVD (video store) is preventing triggering?
I got to wondering how hard would it be to build such a device?
found a schematic but its for a small table top unit (prototype)
Electronic article surveillance
circuit sounds easy enough. A 58KHZ feeding some high end op amps.
looks like the Amtel chip is used for generating the 58khz only.
thinking = build similar but larger amp, connect to two antenans on bought unit?
seeing how there are numerious pots to adjust (no real help in tunning description) I am contemplating using a frequency counter (I need one anyway) then measure the transmitter frequency??
specs as I did some investigating
CTR freq = 8.2mhz
scanning freq = +/- 500khz
scan rate = 180hz
detect spacing = 1.2 to 1.6M
bandwidth = 7.5mhz to 8.5mhz
 
Status
Not open for further replies.

EE World Online Articles

Loading
Top