Circuit Diagram

light-controlled timer switch circuit

Published:2011/8/20 3:56:00 Author: | Keyword: light-controlled, timer switch

The picture shows a Mexican light-controlled timer switch circuit, which is suitable for outdoor street lamp and the supply control of advertising lamp box. It is a product that combines the light control function as well as gear shift and timing,and the circuit is simple,easy to make.Set the rotary switch at timing gear 2h, 4h, 6h or 8h,and this circuit will supply the correspondingcontrol time automatically when it has no light to save energy and reduce invalid energy.   (View)

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new switch circuit of door light

Published:2011/8/20 4:16:00 Author: | Keyword: switch, door light

Light switch outside the door is often turned on,turned off by someone,and it is easy to damage.There is a new door light switch. This is a percussive door light switch, and has the role of the doorbell. Circuit is shown as picture, and it is mainly formed by the percussion and detection circuit, door light trigger and delay control circuit, the doorbell circuit and power supply circuit.F1 ~ F4 adopt CD4093 digital integrated circuits. Music IC adopts KD-156 model. VT1, VT2 adopt SC9014 transistor; VT3 uses SC9013 transistor; VT4 uses 2SC9012; VT5 uses 2SC8050.   (View)

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voice operated delay lamp circuit

Published:2011/8/19 6:35:00 Author: | Keyword: voice operated, delay, lamp circuit

The telephone-table lamp shown in the picture can light automatically when it rings in the evening or it is off-hook,and it will extinguish after a delay of 45s when it is on-hook.Usually it can be used as a general dimming lamp without switch. And when it is used as a delay light,it will extinguish after a delay of 45s if you press the delay button.The circuit has many applications,and it is formed mainly by the optical coupling circuit, light control circuit, negative pulse generating circuit, monostable trigger circuit, thyristor switch circuit and power circuit.   (View)

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currency detector circuit

Published:2011/8/19 6:23:00 Author: | Keyword: currency detector

The audio alarm currency detector is used to identify the counterfeit money, this machine can remind people by sending out Attention,this is the counterfeit money, and its internal circuit is shown in the picture. It consists of magnetic track detection, watermark detection, fluorescent indicator and power supply ofaudio alarm and so on.   (View)

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wireless alarm with multiple detective heads circuit

Published:2011/8/17 7:41:00 Author: | Keyword: wireless alarm, multiple, detective heads

This alarm separates the detection part and alarm part,and an alarm can be with multiple detective heads.The detection part and alarm part can communicate by wireless wave. It is divided into wireless alarm receiver as well as wireless alarm detection and transmitter. The wireless alarm receiver is formed by the 315MHz wireless data receiver module, decoding IC PT2272-M4, monostabillity circuit and audio generator. Wireless alarm transmitter and detection has many detective circuits.The circuit is shown as picture.   (View)

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high-sensitive alarm

Published:2011/8/14 19:56:00 Author:chopper | Keyword: high-sensitive, alarm

The picture shows the simplified circuit of high-sensitive alarm,and its photoresistor resistor are connected with three LDR ordinary resistors. Thus, when light varies from dark to full light,the potential range of point X is about 1/4 to 3/4 as large as power supply voltage. This potential is also added to input ends of two double contact switches.A self-excited oscillator and a grouping circuit of inverter control the switches to transform alternately,and the switching frequency is usual a few Hertz, making two capacitors charge alternately.   (View)

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audio monitoring system

Published:2011/8/14 20:05:00 Author:chopper | Keyword: audio, monitoring system

As to important program for vital period, it can adopt selected demodulator to monitor through the audio power amplifier which can display the state of the audio, and has friendly interface to get the failures timely and accurately and ensure the quality of the audio.As for programs for non-critical time,it can use automatic channel(or frequency) conversion demodulator and audio indicator and audio alarm for surveillance.   (View)

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thyristor drive circuit

Published:2011/8/14 20:13:00 Author:chopper | Keyword: thyristor, drive circuit

Circuit is formed mainly by the new pyroelectric infrared sensor TDH98072. The circuit assembled with the device is of the advantages like simple circuit, easy adjustment, and high reliability. The device can also assemble other control circuits, such as burglar alarm, automatic lights, automatic valves, etc.The light resistance (in the bright environment resistance) of the selected CdS photoresistor should be less than l00kΩ,and dark resistance should be greater than 3.3MΩ. Pyroelectric infrared sensor PIR can choose either a small pyroelectric sensor (with the lens, such as ANM1 type).   (View)

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oil furnace control circuit made by frequently-used integrated package

Published:2011/8/14 20:21:00 Author:chopper | Keyword: oil furnace, control circuit, frequently-used, integrated package

The circuit is suitable for small oil furnace as a controller. The integrated package of previous small oil furnace controller is special integrated piece or single-chip microcomputer,which are difficult to buy in medium and small cities,thus the repair is difficult.The small general-purpose oil furnace controller is with reliable performance, simple structure, low cost, easy maintenance, etc.Just change the wiring, you can apply it to a variety of oil furnace.   (View)

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omnidirectional tracking soalr electronic device

Published:2011/8/16 1:50:00 Author: | Keyword: omnidirectional tracking, soalr, electronicdevice

The working principle:it uses the photovoltaic solar device,and if it can not track the sun,its performance will greatly reduce. Here the device allows it to achieve full track of horizontal and vertical direction of the sun,and it will automatically reset at night.To track the sun, it must have solar probe. As shown in the picture, the solar probe of the device consists of a convex lens, five light-sensitive resistors, the control circuit board and a cylinder.   (View)

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inner flash circuit of camera

Published:2011/8/16 2:00:00 Author: | Keyword: flash circuit, camera

The circuit is formed by light metering circuit and flash circuit,just as shown in picture.It is suitable for POPTICS (a popular integrated camera), Franka X-500, WIZEN-860S and so on.It consists of the following circuit:(1)VT1,VT2,light metering device RG (using cadmium sulfide CdS photoresistor)form the light metering circuit. (2) VT3,C1,T1 form the inductive three-point type oscillator circuit to complete the transformation:low-voltage DC → high-voltage AC → high-voltage DC,and provide the flash with power. Component selection: VT1, VT2 use C945-type transistor;VT3 uses D965-type transistor.   (View)

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lampblack absorber automatic control circuit

Published:2011/8/16 2:10:00 Author: | Keyword: lampblack absorber, automatic control

The working principle:the gas sensor and W1 in the picture form the gas detection circuit,and the 5V AC power of power transformer will heat the heating silk of the gas sensor. Inverter F1, W2, thermistor Rt form the temperature sensing circuit.The high potential signal output by two detection circuit will control the motor control circuit formed by F2, F3, R2, VT2, J1 through the isolative diode VD8, VD9 respectively. Photosensitive resistor CdS, W3, F4, R3, VT3, J2 form the lighting control circuit; IC1 is the music alarm circuit, and it is controlled by the gas detection circuit.   (View)

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electric mixer circuit

Published:2011/8/17 7:13:00 Author: | Keyword: electric mixer

The materiel of electric mixer used in industrial and mining enterprises often has odors or dust,so the operators should not be too close.The light-operated electric mixer(or other electrical appliance) circuit shown in the picture can adopt ordinary flashlight as remote control commands, and it can control the electric mixer in 10m.The entire circuit can be put into plastic box,and it is easy to use in the field.Components selection: IC adopts AN7812 three-terminal regulator IC. VT1~VT3 use 9014 transistor.   (View)

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neon flasher circuit of licence plate of motorcycle

Published:2011/8/17 7:29:00 Author: | Keyword: neon flasher, licence plate, motorcycle

The working principle:adding the neon flasher to the licence plate of motorcycle can increase the safety of motorcycle in the evening,and it can remind the followed the vehicles, it also can flash with the tail-lamp when the motorcycle brakes.The devicecan adopt the neon tube which can surround the plate just a round as nocturnal lighting.VT1, VT2 constitute a complementary astable multivibrator, BP1, C3 determine the frequency of oscillator.   (View)

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LVF501 FM radio tuner circuit

Published:2011/7/25 2:17:00 Author:chopper | Keyword: FM radio, tuner circuit

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BA4424N FM radio tuner circuit

Published:2011/7/25 2:18:00 Author:chopper | Keyword: FM radio, tuner circuit

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function and data of pins of integrated circuit TDA9860

Published:2011/7/26 5:54:00 Author:chopper | Keyword: function, data, pins, integrated circuit

TDA9860 —— I(2)C Bus control universal Hi-Fi audio signal processing integrated circuit. 　　TDA9860 is a Hi-Fi audio signal processing integrated circuit produced by Philips,which is widely used in large-screen TV and RPTV, home theater and computer, DVD player and other audio systems.1.function characteristics　TDA9860 IC can switch the input of three-way stereo audio signal or six-way single channel audio signal to the one of the SC / L light,speaker and earphone for outputting.   (View)

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AN7220,7221 FM,AM intermediate frequency amplifier circuit

Published:2011/8/25 20:21:00 Author:chopper | Keyword: FM,AM, intermediate frequency, amplifier circuit

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Electronic decorative peacock flaunting circuit of CD4017,NE555

Published:2011/7/26 6:06:00 Author:chopper | Keyword: Electronic, decorative, peacock flaunting

Electronic decorative peacock flaunting includes 10-group light-emitting diodes,each LED contains multiple light-emitting diodes, and these LEDs are installed on the tail of the peacock in.And under the drive of the light-driven circuit,these LEDs shine circularly and radially by the fan shape,which is like the peacock flaunting,and itis shown as picture. It consists of LED drive circuit, drive pulse oscillator and LEDs.   (View)

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function and data of pins of integrated circuit

Published:2011/7/26 5:46:00 Author:chopper | Keyword: function, data, pins, integrated circuit

TDA9859 —— I(2)C Bus control sound source switching, audio processing integrated circuit 　　TDA9859 is the sound source switching,audio processing integrated circuit produced by Philips,which is widely used in domestic and imported large-screen color TVs.1.function characteristics TDA9859 integrated circuit contains the accompanying signal of main channel switching and processing circuit, I(2)C bus interface circuit, high and low turning point setting circuit, R and L channel audio signal processing circuit, reference voltage circuit, pseudo-stereo setting circuit, the analog site selecting and input signal processing circuit, and other auxiliary circuits.   (View)

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