BASIC_QUASI_COMPLEMENTARY_POWER_AMPLIFIER_CIRCUIT

Published:2009/6/19 1:51:00 Author:May

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RIAA_PHONO_AMPLIFIER

Published:2009/6/19 1:48:00 Author:May

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ONE_CHIP_STEREO_PREAMP_WITH_TONE_CONTROL

Published:2009/6/19 1:48:00 Author:May

A Motorola TCA5500 or TCA5550 can provide a stereo preamplifier system with tone controls. This circuit provides a gain of about 10X, a 14-dB tone-control range, a 75-dB volume control range, and it can operate from 8 to 18 Vdc. IC2 provides 15 V for 101, and the input of IC2 can be supplied from the power amplifier's power supply (+) rail. D1 and R5 should be used if over 30 V input will be used.   (View)

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BASIC_QUASI_COMPLEMENTARY_POWER_AMPLIFIER_WITH_SPLIT_POWER_SUPPLIES

Published:2009/6/19 1:47:00 Author:May

This is the basic circuit used in many audio power output stages where split supplies are used.This amplifier is inherently dc coupled and has high open loop gain and good dc stability if the feedback network is properly designed.   (View)

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RFI_PROOF_AUDIO_POWER_AMPLIFIER

Published:2009/6/19 1:46:00 Author:May

This 1-watt audio amplifier was used in an FM repeater and proved to be immune to strong RE signal pickup. It functioned well in very strong RE fields.   (View)

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16_W_BRIDGE_AMPLIFIER

Published:2009/6/19 1:45:00 Author:May

This circuit delivers 16 W RMS audio into a 4-Ωload (RL). The ICs are LM383s．   (View)

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POWER_SUPPLY_FOR_VACUUM_TUBE_AMPLIFIER

Published:2009/6/19 1:43:00 Author:May

The power supply for the amplifier uses two low-voltage transformers connected back-to-back The full-wave bridge rectifier, BR1 provides dc for the filaments, plates, and screens.   (View)

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SIMPLE_VACUUM_TUBE_AMPLIFIER

Published:2009/6/19 1:43:00 Author:May

Using a pair of 60 FX5 tubes, direct operation from 120 Vac is possible. However, the use of a power supply with an isolation transformer is recommended. RI is adjusted for equal voltages at pin 1 of V1 and V2. The power output is about 2 to 3 watts.   (View)

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LINE_OPERATED_AUDIO_AMPLIFIER

Published:2009/6/19 1:41:00 Author:May

An audio amplifier which operates off a +98-Vdc power supply (the rectified line voltage) is of-ten used in consumer products. The external high-voltage transistor, Q1, is biased and controlled by the LM3900. The magnitude of the dc biasing voltage, which appears across the emitter resistor of Q1 is controlled by the resistor. The resistor is placed from the (-) input to ground.   (View)

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POWER_BRIDGE_AMPLIFIER_WITH_SINGLE_ENDED_OUTPUT

Published:2009/6/19 1:40:00 Author:May

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10_WATT_AUDIO_AMPLIFIER

Published:2009/6/19 1:39:00 Author:May

This circuit is a general-purpose 10-W audio amplifier for moderate-power PA or modulator use in an AM transmitter. With higher voltages and a change in bias resistors, up to 30 W can be obtained.   (View)

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PARALLEL_POWER_op_AMPS

Published:2009/6/19 1:37:00 Author:May

The power amplifiers, A2 and A3, are wired as followers and connected in parallel with the outputs coupled through equalization resistors.   (View)

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AUDIO_POWER_AMPLIFIER，15W，12V

Published:2009/6/19 Author:May

Although ICs have largely replaced circuits such as this, this circuit still finds use where the flexibil-ity of a discrete device design is desirable. Parts are easy to obtain and the problem of IC obsoles-cence is eliminated. The TIP31A can be heatsinked to a small metal heatsink, if desired.   (View)

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ELECTRONIC_EAR_LOW_NOISE_AUDIO_AMPLIFIER_FOR_PAROBOLIC_DISH_MIKES

Published:2009/6/18 23:57:00 Author:May

Use this circuit with a parabolic reflector microphone for eavesdropping on distant sounds.   (View)

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RIAA_PREAMPLIFIER

Published:2009/6/18 23:55:00 Author:May

This preamp for RIAA phone use uses two op amps by Analog Devices. A switch selects compensation for moving magnet or rrtoving coil pickups.   (View)

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SIMPLE_HIGH_GAIN_AUDIO_AMPLIFIER

Published:2009/6/18 23:53:00 Author:May

This amplifier has a very high gain in the audio range and is approximately the product of the current gains of the three transistors multiplied by the ratio of RL to (RIN+RS).RIN is approximately to:   (View)

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FET_PHONO_CARTRIDGE_PREAMP

Published:2009/6/18 23:51:00 Author:May

A high-Z phono cartridge can be rnatched to a low-Z amplifier with this circuit. The FET provides a current gain of over 1000x and a voltage gain of about 0.5x.   (View)

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HIGH_GAIN_DYNAMIC_MICROPHONE_PREAMPLIFIER

Published:2009/6/18 23:50:00 Author:May

This microphone preamplifier is capable of about 70 dB or more gain at audio frequencies. Its gain is approximately equal to the product of the hfe of both transistors times the ratio of the load resistance to the input resistance of the preamp. As an approximation, these resistances are usually similar in value (≈2 to 5 kΩ) for most applications, so this ratio can be taken as unity.   (View)

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SIMPLE_20_dB_GAIN_AUDIO_AMPLIFIER

Published:2009/6/18 23:49:00 Author:May

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LOW_LEVEL_AUDIO_AMPLIFIER

Published:2009/6/18 23:48:00 Author:May

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