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Index 11

The audio frequency power amplifier with 40W to 60 W output power and formed by MOSFET

Published:2011/6/10 21:09:00 Author:leo | Keyword: The audio frequency power amplifier with 40W to 60 W output power and formed by MOSFET

The audio frequency power amplifier with 40W to 60 W output power and formed by MOSFET
The picture 1 shows a audio frequency power amplifier circuit diagram. It is made up of MOSFET with the output power of 40 to 160 W. In this circuit, the DC current feedback between power output stages to preamplifier stage is decided by the value of R1, while the AC current feedback is decided by the resistance value and capability of C1. The basic amplifying circuit is formed by series connecting the two stages differential amplifiers of VT1, VT2 and VT12 and VT13. The operating point of VT1 and VT2 is decided by constant current circuit VT3, while it is the same condition to VT12 and VT13. VT6, VT7, VT8 and thermistor RT form temperature protection circuit. VT14 forms the over current protection circuit. When the current value of output power MOSFET is stronger than the set value, VT14 is connected while VT12 and VT13 push the current to be weakless, and VT15 and VT16 is cut off. Therefore, all processes reach the final result of protecting the MOSFET. (View)

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M62438-dual channel SUR solution circuit

Published:2011/6/10 21:24:00 Author:leo | Keyword: M62438-dual channel SUR solution circuit

M62438-dual channel SUR solution circuit
M62438 is the integrated circuit of the dual-channel analog SUR solution, which is widely used in audio devices and audio system of the advanced big screen color TV. It is produced by Mitsubishi in Japan. 1.Function features:M62438 contains two 90 angel phase-moving filter system, SRS function switch control circuit, basic power supply circuit of 90 angle phase-moving filter system, and other related circuits. 2.Pin function and dataM62438 adopts 10-pin package methods. Functions of all pins and related data are shown in the picture. (View)

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The microcomputer dialing circuit UM-915-3

Published:2011/6/10 21:32:00 Author:leo | Keyword: The microcomputer dialing circuit UM-915-3

The microcomputer dialing circuit UM-915-3
　 UM-915-3 is a microcomputer dialing circuit which is applied in all kinds of telephone. 1.Function features:Integrated circuit UM-915-3 contains a pulse dialing signal processing circuit and key switch code circuit and other circuits. 2.Pin function:Functions of all pins and related data of UM-915-3 are shown in the picture. (View)

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MC3359-Narrow band FM ZF integrated circuit diagram

Published:2011/5/22 1:43:00 Author:leo | Keyword: MC3359-Narrow band FM ZF integrated circuit diagram

MC3359-Narrow band FM ZF integrated circuit diagram
MC3359 is a type of narrow band FM ZF integrated circuit which applies to frequency modulation of ZF circuit in duplex operation communication devices. 1.Function features:The integrated circuit MC3359 contains mixer circuit, oscillator, amplitude limiter, noise limitation detection, demodulator and other circuits. 2.Pin functions:MC3359 has two kinds of packages: one is 18-pin dual lie and the other is 20-pin patch(1 and 20 are NC while 2 to 19 pin correspond 1 to 18 pin). The picture gives all detailed information about the 18 pins. (View)

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Power Amplifier Circuit Diagram Formed by CA3094 and Others

Published:2011/5/20 22:28:00 Author:leo | Keyword: Power Amplifier Circuit Diagram Formed by CA3094 and Others, CA3094

Power Amplifier Circuit Diagram Formed by CA3094 and Others
As what is shown in the picture, this is a power amplifier circuit which is made up of CA3094 and others. CA3093 contains a output transistor with the maximum output current of 100mA and OTL audio amplifier used for 8Ω load with bootstrap transistor as well as tone control circuit and so on. In the circuit, VT2 and VT3 can form a complementary type emitting following bootstrap circuit. VT1 offers biasing and compensates temperature, which also decides the operating point of AB type amplifiers. C2 is bootstrap capacitor which is used to improve the drive voltage of amplifier. Tone control circuit is located in the load feedback circuit of operating amplifier to acquire better frequency feature. (View)

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MC13135-Wireless receiving demodulation integrated circuit diagram

Published:2011/5/21 22:12:00 Author:leo | Keyword: MC13135-Wireless receiving demodulation integrated circuit diagram

MC13135-Wireless receiving demodulation integrated circuit diagram
MC13135 is a type of receiving demodulation interated circuit which is applied in receiving demodulation of antenna in communication. 1.Function features:The integrated circuit MC13135 consists of dual conversion circuit, local oscillator circuit, mixer circuit, filed intensity detection circuit, audio pre-amplifying circuit, medium frequency signal amplifying circuit and other related circuits. 2.Pins functions and data:The integrated circuit MC14433 adopts 24-pin dual line package. The arrangement and functions of its pins are as what is shown in the picture. Note: If it cannot receive wireless signals, please check whether 22 pin of MC13135 can receive signals or not. If it is ok, please check whether the dual conversion signals of 18 pin is common or not. (View)

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BA3502F-the integrated reproducing circuit of single door stereo

Published:2011/5/18 22:17:00 Author:Borg | Keyword: integrated reproducing circuit, single door

BA3502F-the integrated reproducing circuit of single door stereo

BA3502F is an integrated reproducing circuit of single door stereo produced by Toyo Power Tool Corp., Japan, which is used in ultra-small and ultra-slim radios.1.the internal circuit and pin functions of BA3502FThe internal circuit of BA3502F consists two lines of identical preamplifier circuits, power amplifier circuit, tape running direction switching and displaying circuits and tape type selecting circuits, which is a integrated reproducing circuit of multiple functions.The internal circuit and typical application circuit of BA3502F are listed in Figure 1. (View)

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Portable digital amplifier PWM D type amplification circuit diagram

Published:2011/5/11 4:40:00 Author:Rebekka | Keyword: Portable digital amplifier , PWM D type amplification

Portable digital amplifier PWM D type amplification circuit diagram is shown as above. (View)

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TDA7498 two-channel audio power amplifier integrated circuit diagram

Published:2011/5/5 3:56:00 Author:Ecco | Keyword: two-channel , audio, power amplifier , integrated circuit

TDA7498 two-channel audio power amplifier integrated circuit diagram
Philips TDA7498 is the two-channel audio power amplifier integrated circuit produced by Philips, it is widely used in high-fidelity audio, such as home audio, car audio, TV audio. 1. Features of functionTDA7498 integrated circuit contains two audio power amplifier circuits with the same functions, electronic volume control circuit, the standby control circuit, overheat protection and short circuit protection, output power per channel is 8W. 2. Pin functions and data TDA7498 IC uses 15-pin single in-line package, the pin functions and data are listed in Table 1. Table 1 shows TDA7498 integrated circuit pin functions and data. (View)

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TDA7497 three-channel audio power amplifier integrated circuit diagram

Published:2011/5/5 3:52:00 Author:Ecco | Keyword: three-channel , audio , power amplifier , integrated circuit

TDA7497 three-channel audio power amplifier integrated circuit diagram
TDA7497 is the three-channel audio power amplifier integrated circuit produced by Philips, it is widely used in various hi-fi, such as TV audio, multimedia audio and so on. 1. Features of function TDA7497 integrated circuit includes three ways of audio amplifier circuits with the same functions, and it also has two independent mute functions, and it can execute squelch control on the main channel and center channel; it also sets overheating protection and short circuit protection. 2. Pin functions and data TDA7497 IC uses 15-pin single in-line package, the pin functions and data are listed in Table 1. Table 1 shows TDA7497 integrated circuit pin functions and data. (View)

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Three-channel audio power amplifier integrated circuit diagram

Published:2011/5/5 2:46:00 Author:Ecco | Keyword: Three-channel , audio, power amplifier , integrated circuit

TDA7494 is the three-channel audio power amplifier integrated circuit produced by Philips, it is widely used in the high-fidelity home theater, television, audio and other systems. 1. Features of functionTDA7494 integrated circuit contains three-way audio power amplifier circuits with the same functions, two independent mute control circuits, it can execute independent mute control on the main channel and sub channel; it also has overheat, short circuit protection functions. 2. Pin functions and data TDA7494 integrated circuit uses the package with 15-pin in single row, the pin functions and data are listed in Table 1. Table 1 shows TDA7494 integrated circuit pin functions and data. (View)

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TBA800 5W Amplifier Circuit

Published:2011/5/4 8:48:00 Author:Robert | Keyword: 5W, Amplifier

TBA800 5W Amplifier Circuit is shown below. This circuit's technical data is concluded here: Output voltage, V: U12 12(11~13) Static Sink Current, mA:I1+I3 9(<20) Input DC current, uA: I8 <5 Output power, (Distortion coefficientk=10%), W: Po >4.4 Input AC voltage (Po=5W), mW:U8 80 Input resistance, MΩ:r8 5(>1) Bandwidth (3dB down),Hz: f3dB 40~20000 Distortion coefficient(Po=0.05~2.5W),%k: 0.5 Voltage gain, dB, with feedback:Vu 42(39~45); without feedback:Vu 80 Input port Noise Voltage,uV:Ut 5 Effciency(Po=4W),%:η 70 (View)