Phone alert alarm. Encyclopedia of radio electronics and electrical engineering
Encyclopedia of radio electronics and electrical engineering / Security devices and object signaling
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This alarm is assembled on the simplest domestic element base. The signaling through the relay is connected to a landline or cell phone. The alarm works as follows: In case of an alarm, +12 Volts must be supplied to the input for approximately 3 to 50 seconds.
Next, relay 2 picks up the phone, and relay 1 presses the snooze button. After the phone rings twice, the device turns off completely. Relay 3 will turn it off from power and in standby mode, the current consumption of the device is 0.
(click to enlarge)
Device details
DD1, DD5 - K155LA3
DD2,DD3 - K155TM2
DD4 - K155IE5
VD1, VD2 - any low-power diodes
Relays: any low-power 12 volts, but not reed relays
This scheme can easily be adapted for calling on a mobile phone. At the same time, the circuit changes slightly: an additional block appears - a waiting multivibrator, a short pulse appears at its output, which "picks up the phone".
Relay 2 is connected to the call button, and Relay 1 to the snooze button (depending on the phone model).
Author: Mechanic; Publication: cxem.net
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