RIAA_LINE_AMPLIFIER_DRIVER

Published:2009/6/18 23:45:00 Author:May

Two op amps by Analog Devices are used in this audio Iine amplifier, which is suitable for interfacing with an RIAA preamplifier.   (View)

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TRANSISTOR_RIAA_PREAMP_FOR_MAGNETIC_PHONE_CARTRIDGES

Published:2009/6/18 23:42:00 Author:May

This two-transistor circuit has around 40 dB (midband) gain at 1 kHz. A magnetic cartridge is used as a source.   (View)

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PERSONAL_STEREO_AUDIO_AMP

Published:2009/6/18 23:40:00 Author:May

You can make your personal stereo do double duty as a small room stereo by adding this 2-watt amplifier.   (View)

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TWO_TRANSISTOR_AUDIO_AMPLIFIER

Published:2009/6/18 23:39:00 Author:May

This is a general-purpose audio ampliffier for driving a pair of stereo earphones in monaural mode.Two can be used for stereo. In this case, ground the centei top of the earphone (sleeve of J1).   (View)

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NB_FM_AUDIO_AMPLIFIER

Published:2009/6/18 23:36:00 Author:May

This audio system amplifies, limits, and filters an audio voice signal for use with an FM modulator or VCO. It has pre-emphasis of 6-dB/octave 800-3000Hz. Almost any suitable op amp can be used.   (View)

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MICROPOWER_LINEAR_AMPLIFIER

Published:2009/6/18 23:34:00 Author:May

This circuit, based on the inverter in the CD4007UB CMOS linear amplifier, shows a method for reducing drain current.   (View)

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VACUUM_TUBE_AUDIO_AMPLIFIER

Published:2009/6/18 23:33:00 Author:May

This schematic is for a tubehead amplifier. The output from transformer T1 is positive half-wave ac rectified by Dl and filtered by C1, C2, and RI for a +15-V supply. A -15-V supply is avail-able from D2, C3, C4, and R3. The plate supply for the 12AX7 tubes is produced by a voltage multi-plier.Some listeners prefer the sound of a vacuum tube audio system. Although this is rather subjective and a personal preference, this circuit can be used to simulate the tube sound preferred by these listeners.   (View)

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TUNABLE_FM_ANTENNA_BOOSTER

Published:2009/6/18 23:16:00 Author:May

This two-transistor amplifier circutt with tunable Lank circuits boosts Lhe distant FM signals Coils L1 and L2 are 1 1/2 turns＃20 AWG bail tinned wtre wound around a 2/3 diameter mandrel．   (View)

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Little Modifying Tianpeng AP-321 Power Amplifier Circuit

Published:2011/7/28 17:45:00 Author:Robert | Keyword: Modifying, Tianpeng, Power Amplifier

Openning its case, the resistances are all five-ring metal films, dozens of red CBB small capacitors are high-quality. And the key places even use the sanyo 105℃ electrolytic capacitor. The coupling capacitors are two ELNA no-polarity series normal products. The audio source switch uses the long-axis switch. The kara OK chip uses the Japanese Mitsubishi company's M50195P. The large-power output tube is Toshiba company's 2SC3280 and 2SA1301. When modifying the machine later it alse find that all triodes and resistances have been strictly paired. The back board has two groups of output ports which could connect to a couple of speakers at the same time. It can uses the a switch on front board for AB contrast audition. The Kara OK and the tone stage all have the switchs. When they are not used they could be closed to avoid the bad effects on the sound quality, which is very practical.   (View)

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CRYSTAL_TUNED_AMPLIFIER

Published:2009/6/18 22:50:00 Author:May

  (View)

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BANDPASS_AMPLIFIER

Published:2009/6/18 22:38:00 Author:May

The circuit A is a bandpass amplifier，with the low corner frequency set by the impedance of the transconductance network，The high corner frequency IS set by the impedance ofthe RC network atthe amplifier output The passband gatn is (k）x (R1/RT)． Figure B is a plot ofthe circuit in Figure A，with Rt＝100Ω，Ct＝20nF，R1＝25Ω，and C1＝395pF．   (View)

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BASIC_LOGARITHMIC_AMPLIFIER_USING_OP_AMP

Published:2009/6/18 22:49:00 Author:May

This logarithmic arnplifier uses a single op amp. The current in the feedback loop of the op amp ts equal to the current flow at the input of the op amp.   (View)

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MOSFET_PUSH_PULL_AMPLIFIER

Published:2009/6/18 22:40:00 Author:May

This amplifier can be used for audio or as a driver for inverter service.   (View)

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HIGH_INPUT_IMPEDANCE_ac_AMPLIFIER

Published:2009/6/18 22:39:00 Author:May

This figure shows an op amp used as an ac amplifier. It is unusual in that dc bootstrapping is used to obtain high input resistance without requiring high-value resistors. In theory, this increases the output offset because the op amp offset voltage is multiplied by the resistance boost.But when conventional resistor values are used, it is practical to include R5 to eliminate bias-current error. This gives less output offset than if a single, large resistor were used. C1 is included to reduce noise.   (View)

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HIGH_SIDE_CURRENT_SENSING_AMPLIFIER

Published:2009/6/18 22:38:00 Author:May

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DIFFERENCE_AMPLIFIER_WITH_WIDE_INPUT_COMMON_MODE_RANGE

Published:2009/6/18 22:34:00 Author:May

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TUNED_AMPLIFIER

Published:2009/6/18 22:33:00 Author:May

This circuit is a tuned amplifier circuit, tuned to the resonant frequency of the LC transconduc-tance network: The impedance of the transconductance network is a minimum at the resonant frequency, providing maximum amplifier gain at that frequency. The Q of the amplifier is a function of the parasitic components associated with the LO network. The graph is the frequency response of the circuit, with Lt=2.93 μH and Ct=9.9 pF.   (View)

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VOICE_ACTIVATED_SWITCH_AND_AMPLIFIER

Published:2009/6/18 22:31:00 Author:May

In certain applications, such as transmitter or other communications and control applications, this circuit should be useful. Both audio output and dc control outputs are provided. R9 sets the con-trol threshold.   (View)

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REMOTELY_POWERED_SENSOR_AMPLIFIER

Published:2009/6/18 22:31:00 Author:May

For rerrtote sensor applications, this circuit enables use of a single twisted pair.   (View)

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PROGRAMMABLE_INPUT_AMPLIFIER

Published:2009/6/18 22:30:00 Author:May

This amplifier has eight inputs selectable digitally． IC1 CD4051 SP8T bilateral switch R1 10-kΩ 1/4-W 5% resistorIC2 Op amp to suit application R2 22-kΩ 1/4-W 5% resistorC1 0.1-μF capacitor R3 18-kΩ 1/4-W 5% resistorS1 SPST switch   (View)

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