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Carrier isolation amplifier circuit

Published:2011/12/2 1:49:00 Author:Ecco | Keyword: Carrier, isolation amplifier

Carrier isolation amplifier circuit
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The directly coupled amplifier

Published:2011/12/2 1:50:00 Author:Ecco | Keyword: directly, coupled amplifier

The directly coupled amplifier
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3310 changing into 600 power amplifier diagram

Published:2011/11/4 3:12:00 Author:Ecco | Keyword: power amplifier

3310 changing into 600 power amplifier diagram
3310 monofrequent power amplifier substitution chart (View)

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3508 changing into 600 power amplifier diagram

Published:2011/11/4 3:12:00 Author:Ecco | Keyword: power amplifier

3508 changing into 600 power amplifier diagram
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The power amplifier diagram of 600 changing into 3508

Published:2011/11/10 3:28:00 Author:Ecco | Keyword: power amplifier

The power amplifier diagram of 600 changing into 3508
The 600 power amplifier's welding position can be placed across the top of the power amplifier, the pin 1 of small power amplifier and and pin 11 of large power amplifer are put in alignment, pin 6 of small power amplifier and and pin 9 of big power amplifer are put in alignment, and small power amplifier's pin 2,5 are welding and grounded, and the small amplifier's shield and the large power amplifier's shielding box can be on a plane. (View)

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V70 power amplifier substitution chart

Published:2011/11/4 3:07:00 Author:Ecco | Keyword: power amplifier, substitution chart

V70 power amplifier substitution chart
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V66V60 power amplifier chart

Published:2011/11/4 3:09:00 Author:Ecco | Keyword: power amplifier

V66V60 power amplifier chart
When thetail of phonefaces down,the power amplifier position can be seen. (View)

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5W RF final stage amplifier

Published:2011/11/11 2:13:00 Author:Ecco | Keyword: 5W , RF , final stage , amplifier

5W RF final stage amplifier
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Key pin features LM378 audio amplifier

Published:2011/11/4 3:00:00 Author:Ecco | Keyword: Key pin features , audio amplifier

Key pin features LM378 audio amplifier
The monolithic double power amplifier can be connected to 8Ω or 16Ω load to make each channel output 4W. The ripple suppresses is 70dB; the channel isolation is 75dB, and the input impedance 3MΩ, and it contains current limiting circuit; it has the heating protection function. (View)

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The integrated infrared receiver circuit with pre- amplifier

Published:2011/11/7 21:13:00 Author:Ecco | Keyword: integrated infrared receiver, pre- amplifier

The integrated infrared receiver circuit with pre- amplifier
In the circuit, it uses the integrated amplifier, so the circuit is simple with small size. It uses the TDA4050 IC, and the weak infrared signal is received by the photosensitive diode VD,then it is amplified by transistor. As a result of the condenser lens ( diameter is about 15mm, focal length is about 30mm), it can increase the effective distance with 20 to 30 times. Capacitor C can effectively reduce the range of 50 ~ 100Hz low-frequency interference signals. (View)

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Key pin features of IR3F02 operational amplifier

Published:2011/11/4 3:05:00 Author:Ecco | Keyword: Key pin features , operational amplifier

Key pin features of IR3F02 operational amplifier
Input offset voltage is 400μV; Bias current is 40nA; Gain-bandwidth product GB=15MHz; Switching rate is 6V/μS; Noise is 2μVms; Current consumption is 3.5mA; it uses ±18V power source; Differential motion input voltage is ±30V; Syntype input voltage is ±15V; Power loss is 500mW. (View)

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Dynamic audio preamplifier

Published:2011/11/7 20:51:00 Author:Ecco | Keyword: Dynamic audio preamplifier

Dynamic audio preamplifier
This is a 3 stage discrete amplifier with gain control. Alternative transistors such as BC109C, BC548, BC549, BC549C may be used with little change in performance. The first stage built around Q1 operates in common base configuration. This is unusuable in audio stages, but in this case, it allows Q1 to operate at low noise levels and improves overall signal to noise ratio. Q2 and Q3 form a direct coupled amplifier, similar to my earlier mic preamp.Input and Output Impedance:As the signal from a dynamic microphone is low typically much less than 10mV, then there is little to be gained by setting the collector voltage voltage of Q1 to half the supply voltage. In power amplifiers, biasing to half the supply voltage allows for maximum voltage swing, and highest overload margin, but where input levels are low, any value in the linear part of the operating characteristics will suffice. Here Q1 operates with a collector voltage of 2.4V and a low collector current of around 200uA. This low collector current ensures low noise performance and also raises the input impedance of the stage to around 400 ohms. This is a good match for any dynamic microphone having an impedances between 200 and 600 ohms. (View)

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The reference for amplifier circuit

Published:2011/11/7 20:53:00 Author:Ecco | Keyword: amplifier circuit

The reference for amplifier circuit
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Quadraphonic Amplifier

Published:2011/11/7 21:40:00 Author:Ecco | Keyword: Quadraphonic Amplifier

Quadraphonic Amplifier
This is a four channel amplifier ideally suited for use with quadraphonic equipment such as a Sound Blaster Live card. There is no volume control,audio levels being directly controlled from the sound card itself. Parts List:D1-D4: 1N4001 (4)C1,C20: 1000u CAP (2)C2,C11: 47u CAP (2)C3,C5,C7,C8,C12,C14,C16,C17,C21,C22: 0.1u CAP (10)C4,C6,C13,C15: 10u CAP (4)C9,C10,C18,C19: 2200u CAP (4)R1,R4,R9,R12: 1M RESISTOR (4)R2,R6,R10,R14: 100k RESISTOR (4)R3,R5,R11,R13: 1k RESISTOR (4)R7,R8,R15,R16: 2R7 RESISTOR (4)IC1: 7812 (1)IC2,IC3: LM1778N (2)SPK1,SPK2,SPK3,SPK4: 8R 2 Watt speakers (4) (View)