Guess what this circuit is for !!! :)

[AbdelHamid]

I think , all of that are some filters and mixers or so
for Analog voice reception .!

 

[terminal]

cool design

 

[farhada]

If I can huess again, not joking this time. It is a poor mans WLL.

The battery is for normal operation, the circuit is to controll the "switch" and ring signals and the cell phone is replacing the cable to the station.

If not, I would go for a remote control unit!

BR,
/Farhad

 

[arbalez]

it's an own-made keypad used to replace the original keypad of the cell phone.

 

[humanresourceful]

EPABX system?

 

[ahsan]

may be a mobile battery charger....

 

[pisoiu]

Hello

many thanks for nice answers!! It was funny for me to read.
Competition is over, ACE-X was first has the point (+100 points from me actually), it's remote alarm system built by mine

It's for protecting our garden with bees. I was very surprised but some theft had stolen some of bee-boxes from the garden....

This device has been developed to be low-cost and easy to build (what I've actually found).

The main trick is that used phone (old alcatel) is able to dial number by holding defined key. The most difficult part of work was to melt the wires to keyboard and put them out

Device has several current loops - 2port inputs; when intruder breakes the loop, derivative circuit is used to create pulse which is extended to 2sec for activating the dialing.
3 port inputs are used for IR motion sensors which requires +12V supply.

I understand that you're laughing but trust me, this device is rocking stable and fulills all my needs. It was also quite easy to build in my free time...

I see that the announcement made by Eirp is somehow elusive for some people. Competition is over, and the mistery was solved. Topic locked.

/pisoiu