Inductive radio alarm circuit

  
Circuit inductive burglar alarm circuit from the radio scanning detection circuit, a signal processing circuit and alarm circuit, as shown in Figure 13-43. Radar detected by th
Inductive radio alarm circuit - schematic

e radar detection circuit module block (containing microwave emission, low-pass filtering, gating amplification circuit) IC1, W and antenna inductor L components. Identifying amplified by a signal processing circuit module block IC2 (includes regulator, amplified strobe, soft start, comparing amplification, delay isoelectric driving road), a capacitor Ci, Cz, resistor R. And potentiometer RP. Alarm circuit by the resistor Rz, crystal tube VT, two drop-tube VD, relay K and alarm HA, microwave oscillator signal (about 1000MHz) (2) Alarm principle IC1 internal oscillation circuit generated by the antenna to the surrounding space W emit high-frequency electromagnetic waves. Scanning radar detection zone within no moving objects, IC2 control output terminal (terminal 0) output low, VT is in ending state. K in a released state. HA is not sound. When someone moves within the effective range of the radio control scanning detection circuit, the magnetic field space will change. W antenna will detect human body after moving away IC1 points echo signal low-pass processing, the signal output terminal of Ic1 (O side) ultra-low frequency output signal, which is by the IC2 further amplification and strobe delayed drive processing, high output from the control output power peace, so that VT conduction, the relay pull-K, HA powered loud alarm sound.




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