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Category: Inside Circuits Views: 4840 Rank: 4 This house alarm circuit has open and closed loop sensor and has self shutdown function. The delay after trigering can be adjusted from 1 minute to 12. The delay before trigering is 13 seconds. Offcourse all this timmings can be change with litle changes to few passive parts.  The inportand parts in the circuit are 3 ICs CD4011 which are well known quad2 input nand gates, a timer 555 and the CA3097E. Datasheet file1: Click here to download CD4001.pdf datasheet. Datasheet file2: Click here to download LM555.pdf datasheet. Datasheet file3: Click here to download CA3097E.pdf datasheet.
Related circuits Increasing the power rating of zener diodes A power transistor can be used to provide a high powered zener voltage from a low wattage zener. A 400 mW zener can be used where a 10 watt zener is required or a 1 W zener can be used where a 50 to 80 watt zener is required by using appropriate transistors for Ql and Q2 in the circuits shown.... The sound picked up by SPKRl, which acts as a microphone, is fed to transistor amplifier Ql. The output of Ql is applied across coupling transformer T1 and is used to drive the gate circuit of Triac TRl. Remote-sensor-loop-transmitter This circuit shows amplifier Al as a sensor amplifier in a bridge configuration. Amplifiers A2 and A3 are configured as a voltage to frequency converter and A4 is used as the transmitter. This entire sensor/ transmitter can be powered directly from a 4 to 20 mA current loop. The bridge... This circuit is a TTL-to-TTL isolator circuit. The driver circuit is an open-collector TTL inverter (Ul). When the input is high, then the output of the inverter is low. Thus, when the input is high, When the probe is in contact with a TTL low (0) the probe emits a low note. With a TTL high (1), a high note is emitted The monostable circuit is triggered by a continuous input pulse train and the threshold voltage is modulated by a control signal. The resultant effect is a modulation of the output pulse width, as shown Three or more inputs with individual level controls feed into the base of Q1 The signal booster, built around a few transistors and support components, offers an RF gain of about 12 to 18 dB Burglar Alarm and Pulsating LED Circuits from Make: Electronics
Protect your Room with your own Laser Security System!!!
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