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Caller Detection Circuit
Related Component PDF Download:4N25CD40106How the circuit works:In the circuit, J1 is connected to the telephone line. When there is no phone coming in, the Vcc is 0V because there is no ring signal. The circuit does not work without the...
Computer Interface Level Matching Using Photocouplers
In computer systems, various series of semiconductor logic circuits are often consciously connected to each other. Different series of logic circuits require different power voltage. Therefore, different series of logic circuits cannot b...
Circuits that emit various hint languages
Related Component PDF Download:555CX201064013SR4918TDA2879This circuit uses infrared light as an active light source, such as in the gate, in the infrared radiation area, when someone passes by to cover the infrared light, it can automat...
Regional day and night automatic monitoring system
Related Component PDF Download:CD4013LM324Video on-site monitoring has been used in some important and sensitive occasions, such as prisons, treasuries, airports, banks, libraries and museums. The main defect of the original video on-sit...
Let the phone make a musical sound (2)
Related Component PDF Download:4N259013When there are multiple handsets in the same office, it is difficult to tell which one is ringing when you call. Changing the adjacent phone rings to different music sounds solves this problem, and ...
Let the phone play music (1)
Related Component PDF Download:CD4017KA2411Now the mobile phone has the color ring function, which replaces the original monotonous ring tone with various languages and songs, making people feel very novel. You can change the monotonic r...
Power saving regulator circuit
Related Component PDF Download:SE555LM339The power saving regulator circuit is shown in the figure. In addition to the function of a general delay regulator, the main features of the regulator are: (1) Within the safe voltage range of 22...
Infrared Reflection Automatic Hand Dryer
Related Component PDF Download:NE5557809PH302Circuit schematic diagram of infrared reflective automatic dryer:Circuit schematic diagram of infrared reflective automatic dryer:
Overvoltage protection circuit
Related Component PDF Download:3BG12The protective circuit shown in the figure is controlled by the interruption of the photocoupler. When the voltage is normal, the photocoupler has almost no output and the VT tube is reversed and cut o...
Optically Controlled Glow Activator Circuit
The traditional fluorescent lamp starter is neon tube type. The startup time of neon tube starter is greatly affected by the change of ambient temperature and voltage, and its use is not ideal. As shown in the figure, a light-controlled ...
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