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Index 1826

Open-circuit state display logic pen circuit (2)

Published:2011/5/26 8:04:00 Author:Christina | Keyword: Open-circuit, state, display, logic pen

The Open-circuit state display logic pen circuit (2) (View)

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Lithium battery constant voltage charging circuit

Published:2011/5/30 21:21:00 Author:Fiona | Keyword: Lithium battery, constant voltage

Lithium battery constant voltage charging circuit
The figure below shows a constant current of the lithium battery charging control panel, the figure Q1, R1, W1, TL431 consist of the precision adjustable voltage circuit. Q2, W2, R2 consist of adjustable constant-current circuit. Q3, R3, R4, R5, LED are charging instructions circuit. With Rechargeable lithium battery's voltage rises gradually, charge current will gradually decrease,the R4 batteries voltage will continue to decrease after the battery is full finally ended Q3, LED is off, in order to ensure the battery is sufficient,please continue to charge 1 ~ 2 hours after the lights extinguished , it need to install the appropriate size of the heat sink at Q2, Q3 when using. (View)

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Car Windshield Wiper Controller (the 3rd)

Published:2011/5/20 2:55:00 Author:Felicity | Keyword: Car Windshield Wiper Controller (the 3rd)

Car Windshield Wiper Controller (the 3rd)
Work of the circuit The circuit consists of examining circuit, Multivibrator and motor control circuit (It is showed in the picture 7-165.). When it is rainy the Multivibrator begins to work. When the outputted signal is of high level the windshield wiper begins to work. And when the signal is of low level the motor stops working. When the rain is not heavy the motor will just wok for a short time. And when the rain is heavy the motor will work for a rather long time. (View)

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Eye-care Lamps (the 1st)

Published:2011/5/20 1:49:00 Author:Felicity | Keyword: Eye-care Lamps (the 1st)

Eye-care Lamps (the 1st)
Work of the circuit The circuit consists of power circuit, touching light adjust circuit, control execute circuit and light examine circuit (It is showed in picture 9-68.). When hand touches pole A body inducted signal is supplied to rC’s pin 5 through resistor R5 and R6 to make circuit within IC work. The function of light examining can protect the user’s vision in case the light is too dim. (View)

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Agricultural Automatic Water Feeder (18)

Published:2011/5/25 6:02:00 Author:Sue | Keyword: Agricultural, Automatic, Water Feeder

Agricultural Automatic Water Feeder (18)
When the level is lower than b, D6 outputs low level, D5 outputs high level. D1-D4 output low level. VL is red. K is connected. KM is connected. M begins to feed water. When the level reaches c, D6,D1-D4 output high level. K and KM are released. M stops working. When the level is lower, D6 outputs high level, M doesn't work. When the level is lower than b, M begins to work. The circuit works in such a way to keep the level moving between b and c. (View)

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Agricultural Automatic Water Feeder (17)

Published:2011/5/25 5:58:00 Author:Sue | Keyword: Agricultural, Automatic, Water Feeder

Agricultural Automatic Water Feeder (17)
When the level doesn't reach the highest point, V2 is connected and V3 is disconnected. K is connected. M begins to feed water. When the level reaches the highest point, V4 is connected. V3 V2 are disconnected. K is released. M stops working. When the level reaches the low level, V1 and V2 are connected, V3 is disconnected. K is connected and M begins to work again. The circuit works in such a way to keep the water level moving between the highest and the lowest. (View)

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Agricultural Automatic Water Feeder （16）

Published:2011/5/25 5:55:00 Author:Sue | Keyword: Agricultural, Automatic, Water Feeder

Agricultural Automatic Water Feeder （16）
When the level is lower than B, D4 outputs low level, RS will reverse. D3 outputs high level. V and K are connected. M begins to feed water. When the level is higher than B, D4 outputs high level, M keeps feeding water. When the level reaches A, IC's 1 pin has low level, RS will reverse and D3 outputs low level. V is disconnected and K is released. M stops working. When the level is lower than A, IC's 1 pin will become high level. When the level is lower than B, the circuit works like above, keeping the level moving between A and B. (View)

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M50431—101SP (TV)infrared remote control receiving microprocessor circuit

Published:2011/5/26 9:58:00 Author:Lena | Keyword: infrared, remote control, receiving, microprocessor

M50431—101SP (TV)infrared remote control receiving microprocessor circuit

M50431-101SP is a voltage synthesis digital tuning 4-bit singlechip, applied to TV etc. It contains 14bit PWM output circuit used to tune voltage and three 6-bit PWM output circuit used to control analog quantity. The function is identifying different instruction signals sent by infrared remote control receiver, then output control signals to corresponding control circuit. technology featureCMOS technics, power loss is low.Single power supply, the voltage value is 5V±0.5VConnectting Ceramic Resonator and 30pF capacitor, oscillation frequency is 4MHz. (View)

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DC fluorescent circuit

Published:2011/5/30 0:45:00 Author:Christina | Keyword: DC, fluorescent

DC fluorescent circuit
This circuit is composed of three components and a transformer, it has the features of simple structure, high efficiency, low power consumption and durable. (View)

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U disk circuit principle diagram

Published:2011/5/26 8:13:00 Author:Christina | Keyword: U disk, circuit principle

U disk circuit principle diagram
(View)

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Integral circuit principle diagram

Published:2011/5/26 8:14:00 Author:Christina | Keyword: Integral, principle

The Integral circuit principle diagram is as shown: (View)

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HIC1015 protection circuit

Published:2011/5/26 8:15:00 Author:Christina | Keyword: protection circuit

The HIC1015 protection circuit is as shown: (View)

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Crystal transistors EMD12 and UMD12N interal circuit

Published:2011/5/26 8:16:00 Author:Christina | Keyword: Crystal transistors, interal circuit

The Crystal transistors EMD12 and UMD12N interal circuit is as shown: (View)

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DAC0832 and 8031 double buffers synchronous way interface circuit

Published:2011/5/26 7:56:00 Author:Christina | Keyword: double buffers, synchronous way, interface circuit

DAC0832 and 8031 double buffers synchronous way interface circuit
(View)

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DAC811 and 4-bit microcomputer interface circuit

Published:2011/5/26 7:59:00 Author:Christina | Keyword: 4-bit, microcomputer, interface circuit

DAC811 and 4-bit microcomputer interface circuit
(View)

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Sharp C-1460 protection circuit

Published:2011/5/26 7:58:00 Author:Christina | Keyword: Sharp, protection circuit

The Sharp C-1460 protection circuit is as shown: (View)

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Sharp 29NF-1 protection circuit

Published:2011/5/26 2:52:00 Author:Christina | Keyword: Sharp, protection

The Sharp 29NF-1 protection circuit is as shown: (View)

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LED tuning indication circuit

Published:2011/5/25 22:11:00 Author:Christina | Keyword: LED, tuning, indication circuit

LED tuning indication circuit
You can install a LED on the first endpoint of the tuning dish. Which light-emitting diode conducts, the tuning instruction will be away from it, when the two LEDs are all cut off, the tuning instruction will goes to dead point, so we get the right tuning instruction point. The advantage of the tuner is the low current consumption, you can use a LED which has the weakest light to indicate the very tiny tuning error. By adjusting VR1, you can make the dead point area wide enough, so the LED will not flash because of the big volume language or music. (View)