Circuit Diagram

Pressure measurement circuit diagram composed of OPO7

Published:2011/4/29 2:36:00 Author:Nicole | Keyword: Pressure measurement

The figure 1 is a pressure measurement circuit which is composed of OPO7. In the circuit, A2 uses Bi-FET input operational amplifier, when adjust potentiometer RP1, it can avoid the zero drift which is caused by bias current. A3 is initial balanced circuit and singal calibration circuit. The precision of amplifier is 0.5%, but the allowable bridge resistance precision is ±10%. In reality, it can be improved if take measures. The common-mode rejection ratio is about 90dB, 1kHz band noise is about 1~2μV(peak-peak value). It provides pressure sensor with constant current.   (View)

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Benz W140 ADS system control computer circuit diagram

Published:2011/4/29 2:44:00 Author:Ecco | Keyword: Benz , ADS system , control, computer

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Benz W140 (LH System Engine) ADS system circuit diagram

Published:2011/4/29 2:43:00 Author:Ecco | Keyword: Benz, LH System Engine, ADS system

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DSM-872 Typical Application Circuit (b) circuit diagram

Published:2011/4/29 1:30:00 Author:Ecco | Keyword: Typical Application Circuit

In the circuit shown as the chart, the high and low level of pin 3,pin 4 changes alternately, SCR1 and SCR2 will turn alternately, then the lamps will flash alternately.   (View)

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DSM-872 Typical application circuit (1) circuit diagram

Published:2011/4/29 1:40:00 Author:Ecco | Keyword: Typical application circuit

In the circuit shown as the chart, the high and low level of pin 3,pin 4 changes alternately, the LED1 and LED2 will flash alternately.   (View)

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TA7550S audio amplifier integrated circuit

Published:2011/4/29 1:30:00 Author:TaoXi | Keyword: audio amplifier

The TA75550S is designed as one kind of audio amplifier integrated circuit which is produced by the TOSHIBA company, and it can be used in large screen and rear projection TV such as the Konka BT5O01 rear projection TV.etc. 1.Features The TA75550S has two-stage amplifier with the same functions. The two-stage op amp only supplies power to TA75550S, so the distortion is very small. 2.Pin functions and data The TA75550S is in the 9-pin single in-line package, and the pin functions and data is as shown in table 1. Table 1 The pin functions and data of TA75550S   (View)

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Low drift amplification circuit composed of TL592B

Published:2011/4/29 2:40:00 Author:TaoXi | Keyword: Low drift, amplification circuit

The Low drift amplification circuit composed of TL592B is as shown.   (View)

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TA8880CN light/color, line/field small signal processing integrated circuit

Published:2011/4/29 2:35:00 Author:TaoXi | Keyword: light/color, line/field, small signal processing

The TA8880CN is designed as one kind of light/color, line/field small signal processing integrated circuit which is produced by the TOSHIBA company, and it can be used in imported and domestic large screen color television sets. 1.Features The TA8880CN has the brightness, chroma signal processing circuit, the line/field small signal processing integrated circuit, the I2C bus interface circuit, the color signal processing circuit, the graphic, screen display or picture in picture color signal processing circuit, the standard (PAL / NTSC / SECAM) identification and switching control circuit, and other circuit. The TA8880 is in the 64-pin package, the pin functions and data is as shown in table 1. Table 1 ThepinfunctionsanddataofTA8880CN   (View)

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TOYOTA COASTER coach seat belt alarm, rear window defrosting circuit wiring circuit diagram

Published:2011/4/29 1:50:00 Author:Nicole | Keyword: TOYOTA COASTER, coach, seat belt alarm, rear window defrosting

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Benz W129 (KE System Engine) ADS system circuit diagram

Published:2011/4/29 2:30:00 Author:Ecco | Keyword: Benz , KE System Engine, ADS system

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Audio preamp circuit composed of DY336

Published:2011/4/29 2:22:00 Author:TaoXi | Keyword: Audio, preamp circuit

The audio preamp circuit supports the functions of signal switching, volume adjustment and buffer.etc, and you can add the 10 times voltage to amplify it to make the better sound quality. One amplifier channel of the pre-amplifier is as shown. The circuit uses three DY336 low noise, high quality op amps. A1 is the input signal's buffer follower, it can reduces the burden of the signal source. The negative feedback volume controller is composed of the A2 and RPl, this kind of volume adjustment method can reduces the distortion and noise. Compare with the conventional volume control method, the transient distortion is smaller because of the no RC constant's integration effect. The output stage is composed of the A3, VTl and VT2, this stage works under the single-end A condition, the Single-end output contains even harmonics to make the sound quality better, and the current driving force of transistor is stronger, the low level control will be better.   (View)

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Walkman bass upgrade circuit

Published:2011/4/29 1:22:00 Author:TaoXi | Keyword: Walkman, bass upgrade

The LAG665 and LAG668 are single cassette player IC, LAG668 is the improved mode of LAG665, their internal circuits are very similar. For the bass lovers, they can replace LAG665 with LAG668 and change the external circuits to upgrade the bass. Low frequency enhance measures is always to attenuate high or medium frequency. After the high or medium frequency has been attenuated, the signal falls off to influence audio sensitivity and dynamic effects, so the volume falls down and can not meet rated output power. The remedial measures are: 1.Improve the voltage gain of the front stage; 2. Increase the level of first voltage amplification; 3. Improve the rear level's input impedance to improve the input sensitivity by small stimulation; 4. Increase the gain of amplifier. The LAG668 uses the 3 and 4, the first: improve the rear stage's (attenuator) input impedance to 200kt2; the second: improve the power amplifier's voltage gain to 38dB. The Walkman bass upgrade circuit is as shown, channel 1's tone network is the same to channel's.   (View)

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Packet Control Circuit of Chandelier

Published:2011/4/21 9:39:00 Author:Christina | Keyword: Packet Control

1.Operating Principle The packet control circuit of chandelier is as Figure 1 shown, the function is as follows: when the power switch turned on, l1 group of lamp light; when the power switch turned on again, l1 and l2 group of lamp light; then the power switch still turned on, l1 and l3 group of lamp light; fourth operation, l1,l2 and l3 group of lamp light. If we continue to operate, the lanterns will be light over the order cycle again. 2.Installation As the light control circuit is simple and has fewer components, we can make it into PCB before install it at the ceiling lamp's junction box. This circuit do not need to debug, just need to divide the chandelier lamps into three groups and connected correctly by this circuit. In the actual operation, you should avoid the voltage of c3 depleted.   (View)

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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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SE9518 multi-pattern program control color lamp control circuit

Published:2011/4/27 9:20:00 Author:Nicole | Keyword: program control, color lamp

SE9518 is CMOS multi-pattern program control decorative color lamp special integrated circuit, it has eight-way drive output and through the different level grouping of pattern choice terminal K0,K1,K2,K3 can achieve more than 20 kinds of color lamp flashing and jump patterns. The circuit is as shown, it consists of eight-way color lamp control circuit, firecrackers sound, power amplifier circuit, AC depressurization rectifier circuit and steady voltage circuit.   (View)

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74 series digital circuit 74155/156 and other 2 to 4 line decodes/demultiplexers

Published:2011/4/23 3:11:00 Author:May | Keyword: digital, 2 to 4 ine decodes, demultiplexers

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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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Self-adapting zero voltage switching electron ballast

Published:2011/4/23 3:37:00 Author:May | Keyword: self-adapting, zero voltage, switching, electron ballast

The principle diagram of self-adapting zero voltage switching electron ballast IR2520 is mainly used for driving fluorescent lamp with power under 40W. The rated power of the lamp is different. The parameters of components such as Q1, Q2, L2, C7, etc have several differences. For example, when rated power of lighting tube is in the range of 16-28W, Q1 and Q2 should choose MOSFET which is 500V, 2A, such as (IRFC420, etc), the induction value of L2 is about 1.8mH and 3.5mH, the capacity of C7 is normally about 3.3nF-5.6nF. The power of lamp is larger, the induction of L2 is smaller, the real value is determined by debugging in order to close or meet the rated current of the lamp.   (View)

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