Circuit Diagram

1_1000_GAIN_RANGE

Published:2009/7/6 6:39:00 Author:May

Control voltage of 0 to -9 V changes gain of amplifier over complete range while providing maximum output level of 8.5 VRMS and bandwidth of over 20 kHz at maximum gain. If gain range of 100 is sufficient, amplifier can be changed to LM30lA; 20K resistor is then changed to 2K.- Linear Applications, Vol. 2, National Semiconductor, Santa Clara, CA, 1976, AN-129, p 5.   (View)

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LOW_TEMPERATURE_COEFFICIENT

Published:2009/7/6 6:36:00 Author:May

Use of National 2N3954 dual FET as input device for opamp gives fast response to thermal transients, making it possible to adjust R3 and R4 so temperature coefficient is less than 5 μV/℃ from -25℃ to +85℃. Common-mode rejection ratio is typically greater than 100 dB for input voltage swings of 5 V, Drain current level is set by Q2 which is 2N5457 FET.- FET Databook, National Semieonductor, Santa Clara, CA, 1977, p 6-4-6-7.   (View)

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POSTAMPLIFIER

Published:2009/7/6 6:35:00 Author:May

CMOS transistor pall fromCA3600E transistor array provides additional 30-dB gain above 100-dB gain of CA3080 opamp to give total of 130 dB. Current output is about10 mA. Remaining transistor pairs of array can be paralleled pail shown to give greater output. – Linear Integrated Circuits and MOS/FET's, RCA Solid State Division, Somerville, NJ, 1977, p 278-279.   (View)

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ARMATURE_TESTING_BRIDGE

Published:2009/7/22 22:55:00 Author:Jessie

Identical current pulses are injected into perfect standard armature and production armature being tested. Transient response, displayed on cro, permits fault diagnosis and location. Choice of four operating modes provides operating flexibility.-H. R. Weed and S. K. Weed, Pulse Response Pinpoints Armature Foults, Electronics, 33:24, p 70-72.   (View)

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100_kHz_BUFFERED_RECTIFIER

Published:2009/7/6 6:34:00 Author:May

High-speed 110 voltage follower is used within feedback loop of A1 to maintain low output impedance for precision half-wave rectifier, When input signal is positive, D1 and R4 rectify signal and A2 follows this signal. On opposite alternations, D1 is off and feedback loop of A2 is closed through D2 so output terminal is maintained at low impedance. For opposite output polarity, reverse diode connections.-W. G. Jung, IC Op-Amp Cookbook, Howard W. Sams, Indianapolis, IN, 1974, p 192.   (View)

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TRANSISTOR_TESTER_WITH_SPEAKER

Published:2009/7/22 22:53:00 Author:Jessie

Blocking-oscillator test circuit provides tone from speaker only when transistor is good (not open, shorted, or leaky). Runaway transistors con be detected by providing npn-pnp switch and reversing it to stop oscillation for a few seconds, then restoring correct position. If transistor then oscillates al different frequency or will not resume oscillation, it is a runaway.-L. G. Sands, Dynamic Testers For Transistors, Electronics, 33:8, p 66-67.   (View)

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POWER_BOOSTER

Published:2009/7/6 6:33:00 Author:May

Simple two-transistor power stage increases power output of LM143 high-voltage opamp. Intended for loads less than 2K. Drawbacks are noticeable crossover distortion and lack of short-circuit protection. Transistors should be used with Thermalloy 2230-5 or equivalent heatsinks.- Linear Applications, Vol. 2, National Semiconductor, Santa Clara, CA, 1976, AN-127, p 3.   (View)

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PHASE_ERROR_TESTER

Published:2009/7/6 6:32:00 Author:May

Circuit reveals significant phase errors at relatively low frequencies, even for high-speed opamps. Technique applies to most opamps and almost any signal gain. Article gives operating instructions based on observation of null with XY CRO connected to phase-error test output.-R. A. Pease, Technique Trims Op-Amp Amplifiers for Low Phase Shift, EDN Magazine, Aug. 20, 1977, p 138.   (View)

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1_of_15_cascaded_video_mux

Published:2009/7/22 22:53:00 Author:Jessie

In this circuit, two MAX455s are cascaded to form a 1-of-15 video MUX by connecting the output of one MUX to one input of the input channels of a second MUX. Although the two devices are usually close to one another, the out-put of the first MUX should be terminated to preserve bandwidth.   (View)

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DYNAMIC_TRANSISTOR_TESTER

Published:2009/7/22 22:51:00 Author:Jessie

Uses blocking oscillator and depends on fact that open, shorted, or excessively leaky transistors will not oscillate. Good transistors should oscillate with R1 set at zero, and make neon lamp glow if S1 is on.-L. G. Sands, Dynamic rosters For Transistors, Electronics, 33:8, p 66-67.   (View)

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POWER_OPAMP

Published:2009/7/6 6:23:00 Author:May

Transistor Q1 and power transistor IC Q2 form equivalent of power PNP transistor for use with NPN LM195 power transistor IC serving as output stage for opamp. Circuit is stable for almost any load. Bandwidth can be increased to 150 kHz with full output response by decreasing C1 to 15 pF if there is no capacitive load to cause oscillation.- Linear Applications, Vol. 2, National Semiconductor, Santa Clara, CA, 1976, AN-110, p 5-6.   (View)

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DIFFERENTIAL_I_O

Published:2009/7/6 6:23:00 Author:May

Arrangement shown for three 741 opamps gives amplifier having differential output as well as differential input. Circuit is designed primarily to drive meter with signal of either polarity when center-tap power supply is not available. Article covers operation and adjustment of circuit.-A. D. Monstall, Differential Input and Output with Op-Amps, Wire-less World, Jan. 1973, p 31.   (View)

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BOOSTING_VOLTAGE_RATING

Published:2009/7/6 6:22:00 Author:May

Bootstrapping technique permits operation of low-voltage unity-gain opamp from high-voltage DC supply for handling large input signal voltage swings, while retaining gain and voltage stability of opamp. Allowable input-voltage range depends entirely on transistor rating. With 1000-V transistors, circuit can handle input signals of ±475 V. Input capability for values shown is ±100 V P-P for DC to 10 kHz. Output capability is 5 mA P at t 100 V. Input impedance is 10 teraohms. -S. A. Jensen, High-Voltage Source Follower, EDN IEEE Magazine, Feb. 1, 1972, p 58.   (View)

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CMOS_A_D_converter_with_positive_true_logicbipolar__VSUBREF_SUB_to___VSUBREF_SUB

Published:2009/7/22 22:50:00 Author:Jessie

This circuit is similar to that of Fig. 6-8, except that the output is positive-true -VREF to + VREF.   (View)

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RELAY_CONTACT_CHATTER_TESTER

Published:2009/7/22 22:49:00 Author:Jessie

Monitors either open or closed contacts, in 10-microsec increments for intervals of from 10 to 100 microsec. Thyratron conducts if relay contacts remain open (or closed) longer than pre determined interval. Inverter (at right) triggers thyratron during testing of contacts, and is normally open Contacts under test are connected to J3 and J4.-E. H. Kopp, Production Line Checker for Relay Contact Chatter, Electronics, 33:21, p 94-95.   (View)

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100_mA_CURRENT_BOOSTER

Published:2009/7/6 6:20:00 Author:May

Provides short-circuit protection along with current boosting for LM143 high-voltage opamp. Diodes are 1N914. Use Thermalloy 2230-5 or equivalent heatsinks, with transistors Output is± 33 V P-P into 400-ohm load.-“Linear Applications, Vol. 2,” National Semiconductor, Santa Clara, CA, 1976, AN-127, p 4.   (View)

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100_kHz_FULL_WAVE_RECTIFIER

Published:2009/7/6 6:19:00 Author:May

Feed-for-ward connection of opamps gives high-speed full-wave rectification of signals up to 100 kHz for measurement and analysis.-W. G. Jung, IC Op-Amp Cookbook, Howard W. Sams, Indianapolis, IN, 1974, p 193-194.   (View)

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CMOS_A_D_converter_with_positive_true_logic_0_V_to___VSUBREF_SUB_input

Published:2009/7/22 22:47:00 Author:Jessie

This circuit is similar to that of Fig. 6-8, except that the output is positive-true 0 V to + VREF.   (View)

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8_channel_video_mux_amplifier

Published:2009/7/22 22:47:00 Author:Jessie

This circuit provides a 50-MHz gain-bandwidth (unity gain at the cable end) video MUX, which is controlled by a 3-wire channel select. The cable is back-terminated (R3) to match cables and reduce reflections.   (View)

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MISSING_PULSE_ALARM

Published:2009/7/6 6:15:00 Author:May

Developed for sensing missing light pulses or detecting absence of object on moving conveyor belt. CA3062 com bination light sensor and amplifier detects light pulses synchronized to 60-Hz line. With SW1 at A, each pulse resets 20-ms timing network of 2N2646 UJT at 16.7-ms intervals, preventing UJT from firing. If light beam is interrupted by object, UJT is allowed to fire and trigger 2N3529 SCR that turns on alarm. With SW1 at B, circuit detects interruptions in steady light beam and sounds alarm only when interruption does not occur.-J. F. Kingsbury, Double Duty Photo Alarm, EDN|EEE Magazine, May 15, 1971, p 51.   (View)

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