Photo coupler data transmission circuit

Published:2011/4/24 8:49:00 Author:Nicole | Keyword: photo coupler, data transmission

MCD2 photoelectric isolator can receive TTL input singal. Transmitter 322 comparator drives LED of MCD2, receiver 322 comparator is added bias circuit, then it can match with the photodiode output of photoelectric isolator. This circuit is inphase, the delay time is about 2μs. V+ can be 4.5~40V.   (View)

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1A transistor integrated circuit driven by photoisolator

Published:2011/4/27 9:42:00 Author:Nicole | Keyword: transistor, opto-electrical isolator drive

Any standard photoelectric isolator can produce enough output to meet the input current requirement of 1A power transistor. When it is without drive singal, R1 pulls in the Q1's base current, to keep it cut off. To add power supply to LED D1, then LM195 will be absolutely conducted by the insufficient 20μA current which is produced by photodiode D2. The power voltage can reach 42V.   (View)

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The power supply circuit of high efficient emergency light

Published:2011/4/23 3:14:00 Author:May | Keyword: power supply, high efficient, emergency light

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ltc4053 USB charger circuit diagram

Published:2011/4/23 3:13:00 Author:May | Keyword: USB charger

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The principle diagram of 400W switchching power output dc5v/80a

Published:2011/4/11 1:03:00 Author:may | Keyword: switchching power, 400W, output dc5v/80a

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330W AC stabilized voltage supply circuit

Published:2011/4/15 5:34:00 Author:May | Keyword: stabilized voltage supply

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3~120V stabilized voltage supply circuit

Published:2011/4/14 5:58:00 Author:may | Keyword: stabilized voltage supply

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Protective current adjustable 15V stabilied voltage supply

Published:2011/4/15 5:21:00 Author:May | Keyword: Protective current adjustable, 15V, stabilied voltage supply

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QiSheng DVD-8829 switching power supply circuit diagram

Published:2011/4/11 4:11:00 Author:Rebekka | Keyword: Singular sound , switching power supply

Here is the schematic diagram of theQiShengDVD-8829 switching power supply circuit:   (View)

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Cursor control circuit

Published:2011/4/27 9:45:00 Author:Nicole | Keyword: cursor control circuit

This circuit uses software to control cursor, then the cursor can be writen at any place of display screen, it is not limited by the form of from above to below or from left to right. TVII system contains 8K bits BASIC and 32 usable ASCII control codes, but only 18 codes are used. Three 7445 BCD code changes into BCD decoder work as the way of 3 lines change into 8 lines, the (12) is used as chip start-up line. When the (12) is low level, there must be a output turning into low level.   (View)

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TDA two chips switching power supply circuit diagram

Published:2011/4/28 9:31:00 Author:Rebekka | Keyword: two chips , switching power supply

TDA two chips switching power supply circuit diagram is shown as above.   (View)

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Hafeisaima car charging system circuit diagram

Published:2011/4/28 1:38:00 Author:Rebekka | Keyword: Hafeisaima car charging system

Hafeisaima car charging system circuit diagram is shown as above.   (View)

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Using TDA as positive and negative regulator dual power supply circuit diagram

Published:2011/4/28 1:36:00 Author:Rebekka | Keyword: positive and negative , regulator dual power supply

Using TDA as positive and negative regulator dual power supply circuit diagram is shown as above.   (View)

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Pull-up standard voltage circuit composed of RF2320

Published:2011/4/11 3:02:00 Author:may | Keyword: Pull-up standard voltage

The diagram is pull-up standard voltage circuit composed of RF2320. This circuit uses two transformer TTWB-2-B, one used as input transformer, the other used as output transformer. Using 2 pieces RF2320 to form push-pull circuit. The signal is coupling input through input transformer, get by push-pull enlarge than coupling output by output transformer. Output transfomer centretap offers 7V of power standard voltage.   (View)

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Output boost adjustable power composed Of MAX761 circuit diagram

Published:2011/3/30 5:04:00 Author:may | Keyword: Output boost adjustable, power

The diagram is output boost adjustable transform power, itconsists of highly active, low power consumption Step Up DC convertor MAX761 and some peripheral cells. The output voltage depends on the specific value of R2 and R1, it can calculate according to the formula V0＝(1+R2/R1)×VREF, VREF＝1.5V.   (View)

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Multipurpose charging cirucit

Published:2011/4/13 4:10:00 Author:Nicole | Keyword: multipurpose charging

This circuit not only can charge to Ni-Cd battery and dry battery after used by large current, but also can used in general low voltage DC power supply. The circuit consists of charging part and DC output part. K2 is fast or slow charging selection switch, R2, R3 is limiting resistance, it can change the charging current. Normally, the fast charging is about 4h and slow charging is about 14h. AN, ZD form testing circuit. Before charging,it shouldfix the stay rechargeable battery. When pressed AN, ZD is without light or has low light level, it is normal; When the charging time meets requirement, and press AN, after ZD emitting more than 10s, it means full, it can be used by the electrical equipments.   (View)

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Constant current source using integrated regulator circuit

Published:2011/4/26 3:12:00 Author:May | Keyword: Constant current source, integrated regulator circuit

The value of resistor R in this circuit can determine the value of constant current I3. But I3=I1+I2, among them, quiescent current I2 is about 5mA. The design of circuit must make the voltage U not higher than the maximum value of integrated circuit. The selection of resistor R should make sure that the integrated circuit current not higher than maximum load value, namely, Rmin=UR/IMAXIn the formaula, UR is integrated circuit constanst voltage ,IMAX is integrated maximum current value.Load resistor RL must satisfy the following relation:RL=(UE-UR)/IMAX   (View)

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Using TDA as positive and negative voltage single-supply circuit diagram

Published:2011/4/27 3:49:00 Author:Rebekka | Keyword: positive and negative voltage , single-supply

Using TDA as positive and negative voltage single-supply circuit diagram is shown as above.   (View)

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Using TDA2030 as DC power supply circuit diagram

Published:2011/4/27 3:44:00 Author:Rebekka | Keyword: DC power supply circuit

Using TDA2030 as DC power supply circuit diagram is shown as above.   (View)

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The Driver Circuit of Soft Turn-off Adding Technology

Published:2011/4/21 21:45:00 Author:muriel | Keyword: soft turn-off technological

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