Special points and working principles of Wireless remote Control doorbell
1. Product characteristics
The radio remote control circuit is composed of coded signal transmitting and receiving parts, and its reliability immunity is superior to that of traditional gate.
Pity, is getting more and more extensive application. The door-bell emitter is composed of a transistor multivibrator, pulse modulation and emission.
Quartz crystal frequency stabilization technology has the characteristics of long emission distance, stable working performance and low static power consumption.
2. Introduction to TC4069 chip
TC4069 is a 6 phase inverter
3. Introduction to TO33A chips
TQ33A chip is a music integrated core used in wired doorbell remote control, wireless doorbell and visual doorbell, etc.Can drive the horn directly to emit different music ringtones.
4. The working principle of wireless remote control doorbell
1) the working principle of wireless contact control doorbell transmitter.The circuit principle of the wireless remote control doorbell transmitter.
he working principle of the wireless gated doorbell receiver has been singled out.
The circuit is technical to collect the signal to be able to send the garden to show on the 4th the land. Collector of the bureau city block interiorly has 6 invertes are composed of TC4069 digital integration chip.superregenerative oscillating receiver coil, manually wound, in diameter 5mm 3 times round with 0. 51 enamelled wire, and the middle of the skeleton is tuned with a steel core festival. When the mountain oscillates at the same frequency as the emitter, the superregenerative signal is generated and the transmitter's tuner signal is controlled. L color loop inductor prevents high frequency signal from passing through. The super-regenerative oscillation circuit has the function of self-detection. The modulated signal after the demodulation produces the voltage drop on R, C. Send the TC4069 to amplify, shape and amplify, this is made by the three inverters (three-stage high gain amplifier) are used to filter the detected high frequency clutter, and the signal-to-noise ratio of the detected signal is the highest. Modulation signal and transmitter after three stage amplification (low Frequency 32.768kHz) in the same frequency, the crystal oscillator SAW can select the frequency in the circuit, the signal of the same frequency can pass smoothly and filter out.
The interference of many external signals, the signal sent to the transistor VT after frequency selection, amplifying and shaping, the amplitude of the signal is still low, after the most latter two stages open circuit inversely amplify the output equal-amplitude square wave signal, and finally trigger 703 music integrated chip to make the horn send out different music ringtones.
This article is from ALLICDATA ELECTRONICS LIMITED.