Abstract:
A burglar alarm includes a main unit provided with a power supply voltage regulator circuit, a CPU circuit, an FET driving circuit, and an RLC oscillation circuit to convert digital code signals into analog signals, which are amplified and then carried via a power cord; and a decoding horn provided with a power supply voltage regulator circuit, a reference voltage circuit, an RLC oscillation circuit, a comparison circuit, a CPU circuit, and a horn voice driving circuit to decode and compare a received burglar-alarming signal and drive a horn to make vocal and sounding warnings. The burglar alarm is controlled via different frequencies that represent codes 1 and 0, or a base frequency and different pulse widths representing codes 1 and 0, so that the signals are carriable via the power cord without interference from noise on the power word.
Abstract:
A wireless anti-theft device mainly includes a host having a power-supply voltage-stabilizing circuit, an anti-theft coding and CPU circuit, a host control circuit, an emitting circuit, a host receiving circuit, and an I/O socket; and a wireless siren being internally provided with a power-supply voltage-stabilizing circuit, an RF wireless receiving circuit, a decoding and CPU circuit, and an anti-theft voicing and driving circuit. The anti-theft coding and CPU circuit generates Manchester anti-theft code having a Hi-Low ratio of 1:1, so that the wireless siren could quickly and accurately analyze received data code to emit precise warning sound.
Abstract:
Disclosed is a high-thrust clutch-type automotive electric lock which uses a motor to sequentially rotate a primary gear connected with a clutch assembly, a secondary gear, and a worm connected to the secondary gear, so that a push rod associated with the worm is guided by the worm to move forward or backward and thereby unlocks or locks an automobile door. The clutch assembly and the motor are in a loose connection relation when the motor is not started and no counter electromotive resistance would exist when a key is used to open the automobile door. Therefore, the torque output by the motor can be highly amplified through a big gear ratio of the secondary gear to the primary gear without the problem of counter electromotive resistance.
Abstract:
An ultrathin transmission mechanism for all types of automobile power windows is provided, in which the gears thereof each is formed at its shaft hole periphery with two laterally outward projected flanges for positioning the gears on the transmission mechanism with reduced overall width or thickness required for mounting the transmission mechanism. A transmission chain thereof is partially coated at its cord segments exposed between every two ball-type teeth with a layer of material the same as that used to make the ball-type teeth, thereby preventing the transmission chain from becoming extended even after a long term period of use and to always provide high-precision displacement.