Amplifier Circuit

400_CPS_MECHANICAL_CHOPPER_AMPLIFIER

Published:2009/7/10 21:53:00 Author:May

Chopper modulates incoming d-c signal for a-c amplification, then demodulates output synchronously. Conversion gcdn is above 5,000. Suitable for high-goin low-level strcdn.gage thermocouple, and similar signcds where amplifier drift must be minimized without us ing regulated power supply.-L.S. Klivans, D-C Amplifiers for Control Systems, Electronics, 31:47, p96-100.   (View)

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Norton_OR_gate_and_NOR_gate_with_high_fan_out

Published:2009/7/17 4:36:00 Author:Jessie

This circuit uses one section of an LM3900 to form an OR gate with a fan out of 50 gates (if each gate has a 75-kΩ input resistor). More than three inputs can be OR' ed if desired. The circuit can be converted to a NOR gate when the inputs are interchanged. National Semiconductor Linear Applications Handbook 1991, p 240   (View)

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SCOPE_PREAMP

Published:2009/7/10 21:45:00 Author:May

Extends vertical sensitivity range of scope or VOM at minimum cost. Voltage at output is in phase with input. Switch across C gives choice of AC or DC operation.Table gives frequency and output voltage limits. Input impedance is about 500 kilohms.-G.Coers, High-Gain AC/DC Oscilloscope Amplifier, EDN|EEE Magazine, Feb.1,1972, p 56.   (View)

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CURRENT_AMPLIFIER

Published:2009/7/10 21:44:00 Author:May

Used in FET curve input tracer to amplify drain current passing through R14, sufficiently to give required Y output for oscilloscope. Uses SN72741P opamp as difference amplifier. Article gives other circuits of curve tracer and calibration procedure.-L. G. Cuthbert, An F.E.T. Curve Tracer, Wireless World,April 1974, p 101-103.   (View)

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ELECTROMETER_FEEDBACK_AMPLIFIER

Published:2009/7/17 4:33:00 Author:Jessie

Measures currents in range of 10-11 to 10-15 amp by passing current through high-value precision resistor and amplifying voltage drop across resistor with direct-coupled amplifier of electrometer. British CV2348 is similar to CK5886. Bandwidth is 7.5 Mc. Zener diode D3 provides meter overload protection by damping at about 20% overload.-D. Allenden, Using Feedback in Electrometer Design, Electronics, 32:41, p 71-73.   (View)

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STRONG_NOISE_SUPPRESSING_AUDIO_AMPLIFIER

Published:2009/7/17 4:33:00 Author:Jessie

Feedback circuit limits amplitude of low-frequency signals such as those produced by wind-moved tree branches, to prevent masking vehicular target signals in portable doppler radar. Low-pass filtering compensates for poor bass response of human ear permitting detection of slow-moving targets such as walking man.-J. Scott, D. Randise, and R P. Lukacovic, Portable Radar Traces Battlefield Deployment, Electronics, 33:12, p 67-70.   (View)

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Norton_triangle_wave_generator

Published:2009/7/17 4:30:00 Author:Jessie

This circuit uses one section of an LM3900 to form a triangle-wave generator. Notice that the circuit also produces a square-wave output at the same frequency. National Semiconductor Linear Applications Handbook, 1991, p 233   (View)

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Norton_pulse_generator

Published:2009/7/17 4:30:00 Author:Jessie

This circuit uses one section of an LM3900 to form a pulse generator (with a 1-kHz pulse repetition rate or frequency, and a 100-μs pulse width).   (View)

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LOG_AMPLIFIER

Published:2009/7/17 4:28:00 Author:Jessie

Has highly linear logarithmic output over 30-db dynamic range. Used in obtaining antenna patterns on operating radar system. Output current is directly proportional lo pulse repetition frequency and log of peak r-f pulse power-Logaritthmic Amplifier for Radar Signals, Electronic Circuit Design Handbook, Mactier Pub. Corp., N.Y., 1965, p 107.   (View)

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A_C_AMPLIFIER_FOR_SWR_METER

Published:2009/7/17 4:27:00 Author:Jessie

Collector of Q3 provides d-c offset current required for expanding ct segment of the 10-db scale of the meter. Gain adjustment permits any of the four 2.5-db expand ranges to give a full-scale reading.-D. L. Howard, Drift Control Allows Expansion Scales for SWR Meter, Electronics, 35:21, p 45-47.   (View)

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EKG_input_amplifier_using_an_optically_coupled_3652_HG_isolation_amplifier_to_protect_the_patent_from_possible_lethal_potentials_

Published:2009/7/17 4:26:00 Author:Jessie

EKG input amplifier using an optically coupled 3652 HG isolation amplifier to protect the patent from possible lethal potentials (courtesy Burr-Brown Research Corporation).   (View)

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Multilead_EKG_recorder_input_circuitry_using_a_284J_isolation_amplifier

Published:2009/7/17 4:25:00 Author:Jessie

Multilead EKG recorder input circuitry using a 284J isolation amplifier (courtesy Analog Devices, Inc.).   (View)

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Norton_regulator_with_high_voltage_input_protection

Published:2009/7/17 4:24:00 Author:Jessie

This circuit uses one section of an LM3900 as the control element in a voltage regulator. Q1 and Q2 absorb any high input voltages, and therefore must be high-voltage transistors. With the values shown, the output is about 8.2 V.Diodes can be added (as shown in Fig.11-42B) to reduce ripple feedthrough and input-voltage dependence. Short-circuit protection can also be added, as shown in Fig. 11 -42C. National Semiconductor Linear Applications Handbook, 1991, p. 225 226   (View)

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Isolation_amplifier_for_biomedical_and_industrial_applications

Published:2009/7/17 4:24:00 Author:Jessie

Isolation amplifier for biomedical and industrial applications.(courtesy Analog Devices, Inc.).   (View)

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Norton_direct_coupled_unity_gain_buffer

Published:2009/7/17 4:23:00 Author:Jessie

This circuit uses one section of an LM3900 to form a simple direct-coupled unity-gain buffer. Notice that the input voltage must be greater than one VEB (about 0.5 V), but less than the maximum output swing. National Semiconductor. Linear Applications Handbook, 1991 p 224   (View)

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Fetal_heartbeat_monitoring_input_circuitry_using_an_Analog_Devices_284J_isolation_amplifier_

Published:2009/7/17 4:22:00 Author:Jessie

Fetal heartbeat monitoring input circuitry using an Analog Devices 284J isolation amplifier (courtesy Analog Devices, Inc.).   (View)

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Norton_direct_coupled_power_amplifier

Published:2009/7/17 4:20:00 Author:Jessie

This circuit uses one section of an LM3900 and a Darlington pair to provide an output of 3 A into the load. National Semiconductor Linear Applications Handbook 1991, p 223   (View)

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2_W_LM380_POWER_AMPLIFIER

Published:2009/7/10 21:28:00 Author:May

Complete basic circuit for most audio or communication purposes uses minimum of extemal parts. C3, used to limit high frequencies, can be in range of 0.005 to 0.05 F.-A. MacLean, How Do You Use ICs?, 73 Magazine, June 1977, p 184-187.   (View)

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Norton_amplifier_with_zero_volts_out_for_zero_volts_in_

Published:2009/7/17 4:19:00 Author:Jessie

This circuit uses one section or an LM3900 to form a noninverting direct-coupled amplifier, where zero volts input produces zero volts output. Figure 11-39B shows the voltage transfer function for the circuit, both with and without diode CR1 at the output. National Semiconductor Linear Applications Handbook, 1991 p. 222, 223   (View)

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TRANSISTOR_TURNS_OP_AMP_ON_OR_OFF

Published:2009/7/10 21:22:00 Author:May

When transistor Q1 is switched off, the circuit behaves as a voltage follower. By applying a positive voltage to the emitter of Q1 via a 10 Ω resistor, the transistor is made to turn on and go into saturation. Thus, the lower end of R4 is connected to ground. The circuit has not changed into that of a differential amplifier, except that the voltage difference is always 0 V As long as the resistor ratios in the two branches around the op amp are in the same ratio, the output should be zero. A 47-kΩ resistor is used to null out any ratio errors so that the OFF attenuation is more than 60 dB. The high common-mode rejection ratio of a 741 enables this large attenuation to be obtained.   (View)

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