This example describes a remote radio-controlled "ding" doorbell made from the twh630/631 remote module, and when guests visit, press the doorbell in the frame. Press the button, and the doorbell sends out the sound of a bird's voice, which is so refreshing, that a visitor comes outside the door. If the owner goes home, press the remote switch in his pocket and the doorbell rings. It's particularly suitable for children with primary schools at home, who can go to school without the keys, with a little remote control, and when they come back to the door, with a click on the remote, parents know
Son went home。
Rationale
The remote doorbell remote-controlled transmitter and receiver are the two main parts of the circuit logic, as shown in figures a and b, respectively。
620)this. Width=620; "syle=cursor:point"/
The transmitter's main vehicle is a twh630 micro-radio transmitter, which, when pressing the button to launch sbl, is irradiating high-frequency signals to the air via its inner antenna. This transmitter's modem oscillator uses a normal 555-hour base integrated circuit, which is replaced by a self-inflammation multi-organiser, f=1. 44(r, + 2r2) c1, calculated by the data shown in figure a, b, of approximately 1 khz, and which is modulated by the carrier-end in of radioactivity from electrical resister r3 to twh630。
The receiver, consisting of twh631 radio receivers, lm567 audio transcribers and ki-156 specialized integrated circuits, received first magnification after the signal from the launch module, then sent to lm567 by the output end and then decoded by the central frequency of the transcriber, mainly rrp+r4 and c4, opf = 1 /(rrp+r4) c4, adjusts the rp to equal the central frequency to the modulation frequency of the transmitter 1 khz, at which point the eight-foot output of the block is flat, added to the lower trigger tt2 of the ic5, so that it is triggered by a “tinking” signal and a transist vt magnifying loudspeaker bl. Ic5 is an integrated circuit of “ding-bing-bing-bing-bing-bing-bing-bing-bing-bing-bing-bing-bing-bing-bing-bing-bing-bing-bing-bing-bing-bing-bing-bing-bing. Sb2 is a key installed on the door frame, and when the guest comes to the house and presses sb2, the high-altitude trigger end of tt2 is triggered, so the loudspeaker bl sends the sound of a “bird beep”。
Component selection
Icl may use time-based integrated circuits such as ne555, si55 or p. A5555; ic2, ic3 may wish to use radio launch and reception modules type twh630/631; ic4 for lm567 audio transcipher; ic5 for kd-156 "ding-bird" music integrated circuits, which use black ointment soft seals, r61 r8, capacitors c5 and transistor vt to weld small printing circuit boards of the chip. Vd1, vd2 is the normal 1n4148 silicon switch diode, the effect of which is to operate kd-156 under normal voltage using its current pressure reduction to the diode。
Vt uses the type 9013 silicon npn transistor to require a current magnification factor of β>l00。
Rp should preferably use wsw organic solid calibrations, with no special requirements for other resistance elements, but only smaller volumes。
G1 better use an electronic lighter-specific 12v battery, g2 with a 4 § 5 dry battery with a 6v voltage.
