Audio Circuit

TEANA A33-EL Reversing Light Circuit

Published:2011/7/14 8:40:00 Author:Joyce | Keyword: TEANA, Reversing Light

TEANA A33-EL Reversing Light Circuit   (View)

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TEANA A33-EL Stoplight Circuit One

Published:2011/7/14 8:40:00 Author:Joyce | Keyword: TEANA , Stoplight

TEANA A33-EL Stoplight Circuit One   (View)

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TEANA A33-EL Headlamp(Xenon) Circuit One

Published:2011/7/14 8:41:00 Author:Joyce | Keyword: TEANA , Headlamp

TEANA A33-EL Headlamp(Xenon) Circuit   (View)

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TEANA A33-EL Headlamp(Xenon) Circuit Two

Published:2011/7/14 8:41:00 Author:Joyce | Keyword: TEANA , Headlamp

TEANA A33-EL Headlamp(Xenon) Circuit   (View)

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TEANA A33-EL Headlamp(Xenon) Circuit Three

Published:2011/7/14 8:41:00 Author:Joyce | Keyword: TEANA , Headlamp

TEANA A33-EL Headlamp(Xenon) Circuit   (View)

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TEANA A33-EL Headlamp(Xenon) Circuit Four

Published:2011/7/14 8:42:00 Author:Joyce | Keyword: TEANA , Headlamp

TEANA A33-EL Headlamp(Xenon) Circuit   (View)

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TEANA A33-EL Headlamp(Xenon) Circuit Five

Published:2011/7/14 8:42:00 Author:Joyce | Keyword: TEANA, Headlamp

TEANA A33-EL Headlamp(Xenon) Circuit   (View)

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TEANA A33-EL Front Foglight Circuit

Published:2011/7/14 8:39:00 Author:Joyce | Keyword: TEANA , Front Foglight

TEANA A33-EL Front Foglight Circuit   (View)

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TEANA A33-EL Rear Foglight Circuit One

Published:2011/7/14 8:40:00 Author:Joyce | Keyword: TEANA , Rear Foglight

TEANA A33-EL Rear Foglight Circuit   (View)

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TEANA A33-EL Rear Foglight Circuit Two

Published:2011/7/14 8:39:00 Author:Joyce | Keyword: TEANA , Rear Foglight

TEANA A33-EL Rear Foglight Circuit   (View)

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Visitor or Family Member Differentiated Doorbell Circuit

Published:2011/7/14 0:35:00 Author:Joyce | Keyword: Visitor , Family Member , Differentiated Doorbell

As shown in the figure is a visitor or family member differentiated doorbell(CD4069、KD9300) circuit, which can tell whether it is a visitor or a family member by hearing the times of the doorbell rings.   (View)

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Sprinkler Sound Effects Artificial Circuit

Published:2011/7/14 0:36:00 Author:Joyce | Keyword: Sprinkler , Sound Effects , Artificial

Sprinkler sound effects artificial circuitis composedof a CD4069 and a CD4011, which form three groups of multivibrator with different frequencies. After mixing and modulating, it will produce a sound simulating that of water sprayer. The circuit is as shown in the figure. Two gates of CD4069 in the circuit D1, D2 compose a low frequency multivibrator with R1 and C2, whose function is to control the two audio oscillators to work by turns through cyclical change of the output pulse.   (View)

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Increasing-volume Close-the-door Reminder Circuit

Published:2011/7/14 0:34:00 Author:Joyce | Keyword: Increasing-volume Close-the-door, Reminder

As shown in the figure is an increasing-volume close-the-door reminder circuit. It is used in confidential rooms of banks or other organizations to remind people to shut the door when in and out. When the door remains unclosed for 10s after it is opened, it will give a reminder every two seconds Please close the door with increasing-volume of sound, it will not stop until it is closed.   (View)

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9W Audio Power Amplifying Circuit of μPC2002

Published:2011/7/13 8:22:00 Author:Michel | Keyword: 9W Audio Power, Amplifying Circuit

μPC2002 is audio power amplifying IC and it uses 5 feets single in-line plastic package and its pin's shape is divided into H and V type.This circuit output power is large and its distoration is small,the noise is low and the impulsive sound is low when it starts up. It also has surge-protector of the power supply,over-voltage and short-circuit overload protection. Thus it's widely used in car stereos, audio power amplifier of recorders.And its typical application circuit is shown as above.   (View)

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Telephone audio amplification and recording device

Published:2011/6/30 21:51:00 Author:zj | Keyword: Telephone, audio amplification, recording

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Telephone automatic recording control circuit

Published:2011/7/15 3:15:00 Author:Fiona | Keyword: automatic recording control

Voltage comparator which is compose of integrated circuit IC1 ( LM741) and external components is used for monitoring the telephone line voltage between L1 and L2. When the ordinary dial-up telephone is in hook state,the voltage between L1 and L2 is about 60V;when having a ringing current,it adds communication signal about 100V;when picking up the telephone receiver,the voltage between L1 and L2 drops to about 10V. Using this voltage change can judge out the telephone working state.Every time when picking up the telephone receiver,the control circuit automatically charges the recorder,then the recorder begins recording;when hanging up the telephone,the recorder automatically turns off the power to stop the recording.   (View)

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Program Controlled Gain Amplifier Circuit

Published:2011/7/18 6:27:00 Author:Sue | Keyword: Program Controlled, Gain Amplifier

The circuit is differential input program controlled gain amplifier circuit. 5G4051 works as a single-pole eight-throw switch. When its pin 6 has low level, it is corresponding to one state of A,B,C. When we connect the channel and change one state, the feedback resistance value will be changed once and the corresponding voltage gain will be changed once. The states of the two 5G4051 are changing simultaneously and the output voltage will be differential amplified by F007.   (View)

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High-precision Linear Amplifier Circuit

Published:2011/7/18 1:26:00 Author:Sue | Keyword: High-precision, Linear, Amplifier

The circuit is used to detect sensor signal. The circuit consists of bridge, operational amplifier A1, bridge voltage supply amplifier A2,A3. The output voltage UR,UR' of A2,A3 have the same value and opposite phases. Their values are decided by the base voltage UR and output voltage UO. In the bridge, (1+δ)R4 stands for the resistance value of the temperature sensor. δ is the relative variable ratio.The circuit's linear distortion is not larger than 0.5%, which can be use as the temperature measurement interface in air data processing system. It can also be used to measure the non electrical quantity such as pressure, speed and flow rate.   (View)

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MOSFET Tube Drive Digital Modulation Output Circuit

Published:2011/7/18 3:02:00 Author:Sue | Keyword: MOSFET Tube, Drive, Digital Modulation, Output

The picture shows the MOSFET tube drive digital modulation output circuit.   (View)

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Dual Track Loudspeaker Protection Circuit

Published:2011/7/18 0:46:00 Author:Sue | Keyword: Dual Track, Loudspeaker, Protection

The picture shows the dual track loudspeaker protection circuit. It is designed that the left and right tracks are working independently. In the picture(to take the left track for example), R2, C4 and VT2,VT3 compose starting delay circuit which can prevent the large starting current from shocking the loudspeaker. Component choice:We can choose Φ3mm high-brightness two-tone LED as LED. Because of the reason that LED has different working currents, so R5,R9 have adjustable parameters. At the same time, LED and current-limiting resistor R5,R9 are connected to relay RE1,RE2 in parallel, which can prevent inverse peak voltage and can prevent VT2,VT3,VT5,VT6 frombeing punctured. The best choice for C4,C9 is low-leakage tantalum capacitor.   (View)

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