Amplifier Circuit

Norton_line_receiver_amplifier

Published:2009/7/17 4:17:00 Author:Jessie

This circuit uses one section of an LM3900 to form a line-receiver amplifier. The use of both inputs cancels out any common-mode signals. The line is terminated by RLINE and the large input impedance of the amplifier does not affect this matched loading. National Semiconductor Linear Applications Handbook 1991 p 221   (View)

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Norton_amplifier_with_dc_gain_control

Published:2009/7/17 4:17:00 Author:Jessie

This circuit uses one section of an LM3900 to form an ac amplifier with a variable gain control. The dc gain-control input ranges from 0 V for minimum gain to about 10 V for maximum gain. National Semiconductor Linear Applications Handbook, 1991 p.221   (View)

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Wattmeter_for_an_audio_amplifier_to_100_watts

Published:2009/7/19 20:27:00 Author:Jessie

Wattmeter for an audio amplifier to 100 watts. To use the circuit connect a nonreactive 8-ohm 10-watt load to the speaker terminals with the 0.1-ohm shunt in series with it, The output of the amplifier should be connected to the circuit with AWG #16 wire (courtesy Analog Devices, Inc.).   (View)

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LOW_NOISE_AMPLIFIER_DESIGN

Published:2009/7/17 9:42:00 Author:Jessie

Article gives design procedure based on use of contour maps for 2N2524 at 100 cps, 1 kc, and 10 kc. Goal of design is to confine overall amplifier noise to that of transistor in first stage. Component values are given for three different low-noise amplifiers, each operating in a different range of collector current. -J. W. Baker, Jr., Designing Low Noise Amplifiers from Noise-Figure Contours, EEE, 11:10, p 56-59.   (View)

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WIDEBAND_TEST_AMPLIFIER

Published:2009/7/10 20:20:00 Author:May

This single-stage amplifier (using a 2N2222 or 2N3904 general-purpose transistor) is useful for interfacing test instruments,T1 is an Amidon Associates FT-23-43 core wound with 17 and 6 turns of #26 wire,J3 isa lower-level output for a momtonng device(such as a recelver frequency counter or spectrum analyzer).   (View)

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Bandpass_filter_using_a_μA777_op_amp_for_center_frequencies_up_to_50_kHz

Published:2009/7/17 5:26:00 Author:Jessie

Bandpass filter using a μA777 op amp for center frequencies up to 50 kHz. Set capacitor Cc to 30 pF for frequencies below 10 kHz and 3 pF for frequencies above 10 kHz. Set capacitor C for desired frequency (courtesy Fairchild Semiconductor).   (View)

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53_dB_PREAMP

Published:2009/7/10 6:07:00 Author:May

RCA CA3052 quad AC amplifier serves for both channels of complete stereo preamp. Circuit is duplicated for other channel. Total harmonic distortion at 1-kHz reference and 1-V output is less than 0.3%. Gain at 1 kHz is 47 dB, with 11.5-dB boost at 100 Hz and 10 kHz. Cut at 100 Hz is 10 dB and at 10 kHz is 9 dB. Operates from single-ended supply. Inputs can be from tape recorders and magnetic-cartridge phonographs.- Lin ea r Integrated Circuits and MOS/FET's, RCA Solid State Division, Somerville, NJ, 1977, p 327-330.   (View)

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ULTRALOW_NOISE_PREAMP

Published:2009/7/10 6:06:00 Author:May

Complete preamp has inputs for magnetic-cartridge pickup, tuner, and tape, along with ganged volume control and ganged selector switch for both channels. Tone controls are easily added. RIAA frequency response is within ±0.6 dB of standard values. 0-dB reference gain at 1 kHz is 41.6 dB, producing 1.5-VRMS output from 12.5-mVRMS input. Signal-to-noise ratio is better than -85 dB referenced to 10-mV input level- Audio Handbook, National Semiconductor, Santa Clara, CA, 1977, p 2-25-2-31.   (View)

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Notch_filter_for_up_to_50_kHz_using_two_μA777_op_amps

Published:2009/7/17 5:22:00 Author:Jessie

Notch filter for up to 50 kHz using two μA777 op amps (courtesy Fairchild Semiconductor)．   (View)

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TEMPERATURE_COMPENSATION_IN_EGG_AMP

Published:2009/7/17 5:22:00 Author:Jessie

Circuit has common-mode rejection ratio of 10,000, with adjustable cancellation of unbalanced noise at input, for electrocardiograph. For temperature compensation, C3 bypasses ac signals from base of Q7, so only d-c signals are fed back through this transistor to Q1.-J. R. Smith, Jr., Amplifier Can be Adjusted to Cancel Unbalanced Noise, Electronics, 37:23, p 60-61.   (View)

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PULSED_DISTRIBUTED_AMPLIFIER

Published:2009/7/17 5:21:00 Author:Jessie

Gives 20% bandwidth centered on 200 Mc. Used as output stage of moderate-power radar, final drive of high-power drive, and for high-level pulse amplification.-S. K. Meads, How to Design Pulsed Distributed Amplifiers, Electronics, 32:12, p 56-58.   (View)

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STAIRCASE_USES_THREE_OPAMPS

Published:2009/7/10 5:47:00 Author:May

Two CA3130 bipolar MOS opamps serve as multivibrator and hysteresis switch, while CA3160 is connected to generate linear staircase wave-form.- Circuit Ideas for RCA Linear ICs, RCA Solid State Division, Somerville, NJ, 1977, p 6.   (View)

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PREFERRED_HIGH_IEVEL_CATHODE_POLLOWER

Published:2009/7/10 5:42:00 Author:May

Used to isolate critical circuits from their loads, because it has high input impedance and low output impedance. Not suited for driving low-impedance transmission line, because tube would be severely overloaded.Plate voltage depends on tube used.-NBS, Handbook Preferred Circuits Navy Aero.nautical Electronic Equipment, Vol. I, Electron Tube Circuits, 1963, PC 43, p 43-2.   (View)

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INTEGRATING_OPERATIONAL_AMPLIFIER

Published:2009/7/17 5:12:00 Author:Jessie

Analog-computer type of integrator uses stabilized chopper for integration of dye curve as function of time, in system for measuring dye concentration in blood stream to obtain low rate.-R. L. Skinner and D. K.Gehmlich, Analog Computer Aids Heart Ailment Diagnosis, 32:40, Electronics, p 56-59.   (View)

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500_MC_NEUTRALIZED_AMPLIFIER

Published:2009/7/10 5:40:00 Author:May

Small-signal circuit provides 17 db gain and noise figure of only 3 db. Input impedance is 51 ohms and output impedance is 1,300 ohms in parallel with 1.8 pf. Neutralizing voltage is obtained from coupling loop L3, which is silver-plated strip of beryllium copper run ning parallel to L2.-Texas Instruments Inc., Solid-State Communications, McGraw-Hill, N.Y., 1966, p 299.   (View)

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RC_COUPLED_FET_AMPLIFIER

Published:2009/7/10 5:39:00 Author:May

Used fo drive high-impedcmce headphones in optical com muniation system. Series peaking capacitors CA and CB compensate for high-frequemcy inadequacies in rest of system. No Ictrge electrolytics are needed. Without pecking cctpacitors, amplifier vohage gain is about 400 and upper amd lower break frequendes are 17 cps and 35 kc.-L. J. Sevin, Jr., Field-Effect Transistors, McGraw-Hill, N.Y, 1965, p 64.   (View)

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OUT_OF_BASEBAND_NOISE_AMPLIFIER

Published:2009/7/17 5:09:00 Author:Jessie

Provides transfer function that is essentially logarithmic, with slop of 5 to 7 db per octave, to serve as bias volage for differentical combiner of i-f amplifier in troposcatter f-m receiver. Amplifier control range extends 40 db above threshold. Signal-noise ratio of highest baseband channel is 70 db.-P. Gruber, Crystal Converter for Tropo-Scatter Receivers, Electronics, 31:15, p 78-82.   (View)

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CASCADED_EMITTER_FOLLOWER_WITH_CURRENT_BIAS

Published:2009/7/10 5:33:00 Author:May

Improved frequency response is obtained by biasing Q1 with current generator in emitter or leg.Input impedance is 6 meg. Frequency response is within 3 db from 10 cps to 1 Mc,-Texas Instruments Inc., solid-Stale Communications, McGraw-Hill.N.Y., 1966,p 181.   (View)

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SINGLE_OPAMP_

Published:2009/7/10 5:33:00 Author:May

When switch S1 is in talk position as shown, loudspeaker of master station acts as microphone, driving opamp through step-up transformer T1. Switch at remote station must then be in listen position. Supply voltage range is 8-20 V.- Audio Handbook, National Semiconductor, Santa Clara, CA, 1977, p 4-21-4-28.   (View)

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47_MC_DRIVER_AND_AMPLIFIER

Published:2009/7/10 5:32:00 Author:May

Common-emiller connection gives good power gain with collector-emitter voltage of 20 v,though gain varies with frequency.-Texas Instruments Inc., Solid.State Communications, McGraw-Hill, N.Y., 1966, p 316.   (View)

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