Wireless code remote control doorbell circuit by encoded signal transmission and reception is composed of two parts, its reliability and interference than traditional doorbell, are being more and more widely used. Through the Assembly of this kit, you can make young people intuitively understand the radio transmitter and receiver circuits and the working principle of remote control coding, decoding, and master the basic methods of debugging circuits, to improve students ‘ practical ability has a very good effect.
The kit is school electronic production and e-skills contest supplies. Following figure shows wireless code remote control doorbell Kit kind.
The suite also has circuit schematics, installation diagrams and circuit installation and commissioning instructions.
The radio magazine 2007 issue of making this kit is published articles, we welcome your inspection.
Fabrication and debugging:
First, inventory all circuit components, and testing. And components according to the marks on the printed board location welding , should pay attention to the polarity of components, such as electrolytic capacitors, light emitting diodes , and transistors , integrated circuits and so on.
Transmitter, micro switch, light emitting diodes, Trimmer Capacitors installed in the side plates of copper, battery electrode between the plates and cut out more component leads with connecting lines. When assembled, place the package inside a small piece of foam under the plastic buttons, assembled with the Shell key can be flexible.
Transmitting and receiving circuits when the installation is complete, carefully check the circuit for wrong welding, welding leakage, short circuit and other irregularities, and corrected the correction. Encoding of the transmitting and receiving circuits must be consistent. Then has power to measure voltage at all levels. Transmitter in the micro switch is switched on, the voltage from 0V to IC1 17th foot base voltage of about 1.7V,VT1 about 0.1V. In the receiving circuit, VT2, VT3, VT4 and VT5 collector voltage respectively, 1.3V, 0.8V, 0V, 2.4V, the base voltage is 0.8V, 0.6V, 0.6V, 0V. Touch the antenna coil, 0.1-0.2V of the collector voltage fluctuations in VT3, VT4 0-0.6V of the collector voltage fluctuations, VT5 0.8-2.4V of collector voltage fluctuations.
Voltage can be adjusted after C1 at all levels to adjust the emission frequency, adjusting C1 with no sense of screwdrivers, and do not touch any components, so as not to lead to frequency drift.
If every time you press the transmitter at close range when the micro switch, Bell sound, indicating normal circuit, then you can gradually distancing the experiment, carefully adjusting C1 enables remote control distance in the open reached more than 30 meters.
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