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Amplifier Circuit

Index 130

BALANCE_AND_LOUDNESS_AMPLIFIER

Published:2009/7/2 4:40:00 Author:May

BALANCE_AND_LOUDNESS_AMPLIFIER
The circuit shows a combination of balance and loudness controls. Due to the non-linearity of the human hearing system, the low frequencies must be boosted at low listening levels. Balance, level, and loudness controls provide all the listening controls to produce the desired music response. (View)

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VOLUME，BALANCE，LOUDNESS＆POWER_AMPS

Published:2009/7/2 4:39:00 Author:May

VOLUME，BALANCE，LOUDNESS＆POWER_AMPS
This circuit should prove suitable as a design example for audio sound application. (View)

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400_MHz_10_W_amplifier_136_V_supply

Published:2009/7/24 2:20:00 Author:Jessie

400_MHz_10_W_amplifier_136_V_supply
The electrical characteristics for the 2N3948 shown in this circuit are given in Fig. 2-15B. (View)

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MICROPHONE_PREAMPLIFIER

Published:2009/7/2 4:38:00 Author:May

MICROPHONE_PREAMPLIFIER
A microphone preamplifier using a :om CM0S op amp complete with its own battery, is small enough to be put in a small mike case. The amplifier operates from a 1.5-V mercury cell battery at low supply currents. This preamplifier will operate at very low power levels and maintain a reasonable frequency response as well. The TLC251 operated in the low bias mode (operating at 1.5 V) draws a supply current of only 10 μA and has a -3 dB frequency response of 27 Hz to 4.8 kHz. With pin 8 grounded, which is designated as the high bias condition, the upper limit increases to 25 kHz. Supply current is only 30 μA under those conditions. (View)

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STEREO_PREAMPLIFIER_1

Published:2009/7/2 4:37:00 Author:May

STEREO_PREAMPLIFIER_1
This circuit has RIAA playback equalization, tone controls, and adequate gain to drive a majority of commercial power amplifiers, using the CA3410 BiMOS op amp. Total harmonic distortion, when driven to provide a 6-V output, is less than 0.035% in the audio-frequency range of 150 Hz to 40 kHz. Complete stereo preamplifier consists of duplicating this circuit using the two remaining CA3410 amplifiers. (View)

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AUDIO_COMPRESSOR

Published:2009/7/2 4:35:00 Author:May

AUDIO_COMPRESSOR
A MC3340P is used as a variable gain amplifier. The output of TR2 is rectified and controls the gain of IC1. (View)

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STEREO_PREAMPLIFIER

Published:2009/7/2 4:33:00 Author:May

STEREO_PREAMPLIFIER
The circuit provides better than 20-dB gain in each channel. A better op-amp type will give a better noise figure and bandpass. In this circuit the roll-off is acute at 20,000 Hertz. (View)

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TRANSISTOR_HEADPHONE_AMPLIFIER

Published:2009/7/2 4:31:00 Author:May

TRANSISTOR_HEADPHONE_AMPLIFIER
(View)

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AUDIO_DISTRIBUTION_AMPLIFIER

Published:2009/7/2 4:24:00 Author:May

AUDIO_DISTRIBUTION_AMPLIFIER
The three channel output distribution amplifier uses a single TL084. The first stage is capacitively coupled with a 1.0 μF electrolytic capacitor. The inputs are at 1/2 VCC rail or 4.5 V. This makes it possible to use a single 9 V supply. A voltage gain of 10 (1 M ohm/100 k ohm) is obtained in the first stage, and the other three stages are connected as unity-gain voltage followers. Each output stage independently drives an amplifier through the 50 μF output capacitor to the 5.1 k ohm load resistor. The response is flat from 10 Hz to 30 kHz. (View)

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SOUND_MIXER_AMPLIFIER

Published:2009/7/2 4:19:00 Author:May

SOUND_MIXER_AMPLIFIER
Both input signals can be independently controlled by VR1 and VR2. The balance control VR3 is used to fade out one signal while simultaneously fading in the other. The transistor provides gain and the combined output signal level is controlled by VR4 (optional). (View)

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500_MHz_075_W_amplifier_28－V_supply

Published:2009/7/24 2:22:00 Author:Jessie

500_MHz_075_W_amplifier_28－V_supply

The electrical characteristics for the 2N4428 shown in this circuit are given in Fig.2-17B. (View)

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X100_instrumentation_amplifier

Published:2009/7/24 3:08:00 Author:Jessie

X100_instrumentation_amplifier
This circuit requires two 1.5-V cells connected directly (no power switch) to the V+ and V- terminals. Total current drain is 2.8 μA. R11 matches gains of Al and A2 to get maximum common-mode rejection ratio. Figure 8-32B shows both CMRR and voltage gain across frequency range. C1 balances wiring (rather than amplifier frequency response) to give an additional 10 to 20 dB of CMRR. Maximum peak-to-peak output into a 100-kΩ load is about 1.8 V. When doing power measurements on this circuit, remember that even a 1-MΩ scope probe placed between +1.5 V and -1.5 V more than doubles the power drawn from the batteries. (View)

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225_to_400_MHz_60_W_broadband_amplifier_28_V_supply

Published:2009/7/24 3:07:00 Author:Jessie

225_to_400_MHz_60_W_broadband_amplifier_28_V_supply

The electrical characteristics for the 2N6439 shown in this circuit are given in Fig．2-39B． (View)

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200_MHz_narrowband_amplifier_15_V_supply

Published:2009/7/24 2:49:00 Author:Jessie

200_MHz_narrowband_amplifier_15_V_supply

The electrical characteristics for the 2N5943 shown in this circuit are given in Fig. 2-31B. (View)

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10_AMP_REGULATOR_WITH_CURRENT_AND_THERMAL_PROTECTION

Published:2009/7/2 3:50:00 Author:May

10_AMP_REGULATOR_WITH_CURRENT_AND_THERMAL_PROTECTION
(View)

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ARIABLE_CURRENT_SOURCE，100_mA_TO_2_AMP

Published:2009/7/2 3:24:00 Author:May

ARIABLE_CURRENT_SOURCE，100_mA_TO_2_AMP
Circuit NotesThe output current is set by the resistor R in the collector of Tr2, which may be varied to offer a range of output currents from 100 mA to 2 A with fine control by means of VR3 which varies the reference voltage to the non-inverting input of the op amp. The feedback path from the output to the inverting input of the op amp maintains a constant voltage across R, equal to（VCC-VIN）/and hence a constant current to the load given by（VCC-VIN）/R. (View)