Circuit Diagram

COMPUTERIZED_METER

Published:2009/7/10 21:30:00 Author:May

With 4.7 megohms for R, simple 555 timer circuit used in conjunction with computer measures capacitors in five ranges from below 100 pF to 0.1 μF. For larger range, resistor value can be changed. Article includes BASIC software suitable for 8080.based FROM PORT our systems, including calibration program based on known values of capacitance. 555 mono MVBR is triggered under control of computer output port bit, with count being made while mono is timing out. Count is averaged over ten triggerings, then multiplied in computer by calibration factor to give capacitance value. Any desired type of output indicator can be used.-J. Eccleston, Computerized Capacity Meter, 73 Magazine, July 1978, p 88-89.   (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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CAVE_MAPPING_RECEIVER

Published:2009/7/17 4:29:00 Author:Jessie

Pickup loop feeds low-noise transistor Q1, followed by twostage audio amplifier. Since low-frequency magnetic field (2 kc) is attenuated very little by rock, soil, or water, strength of received signal from transmitter in cave being mapped can be measured. When system is calibrated for distance on surface, depth can be measured.-E. R. Roeschlein, Mapping Caves Magnetically, Electronics, 33:39, p 61.   (View)

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FAR_END_OF_LINE_MODULATOR_CLIPPER

Published:2009/7/17 4:29:00 Author:Jessie

In variation of diode modulator, clipper diodes D9 and D10 are connected to far end of pulse-forming network, for improved perform once. Choke L in plate circuit of thyratron limits rate of rise of thyratron current.-M. G. Gray, Using Silicon Diodes in Radar Modulators, Electronics, 32:24, p 70-72.   (View)

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PULSE_WIDTH_ENCODER

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

Pulse widths in microsecond range are amplitude-limited and dumped into magnetic core. When core saturates, signal is recorded on magnetic tape and core is reset for next series of pulses. The number of changes of state between saturation points gives the number of pulses for core saturation, from which pulse width can be computed.-W. L. Carter and P. J. Knoke, Pulse-Width Measurements, Electronics, 35:43, p 51-53.   (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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Norton_square_wave_oscillator

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

This circuit uses one section of an LM3900 to form a square-wave oscillator (with a 1-kHz output using the values shown). National Semiconductor Linear Applications Handbook 1991 p 232   (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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COSINE_SQUARED_PULSE_GENERATOR

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

Generates pulse whose width is half the duration. of one input sine-wave cycle. Cosine-squared pulse output is fed into balanced modulator in conjunction with 30-Mc signal, and resulting burst is used as input to synchrodyne, klystron.-K. H. Chase and J. L Pierzga Reducing Mutual Radar Interference, Electronics, 32:28, p 39-43.   (View)

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Norton_sine_wave_oscillator

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

This circuit uses four sections of an LM3900 to form a sine-wave oscillator. One section is used as a gain-controlled amplifier (to sustain feedback), and another section is a difference averager that maintains a constant output level.The remaining sections are connected as an RC active filter (to produce a 1-kHz output with the values shown). National Semiconductor Linear Applications Handbook 1991 p 231   (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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TIMING_PULSE_SHAPER

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

Monostable mvbr converts timing signal to narrow pulse whose width is accurately controlled by R-C net work. Use of emitter-follower Q4 between triggered transistor Q3 and R-C network assures fast rise and fall times.-C. E. Veazie, Transistorized Radar Sweep Circuits Using Low Power, Electronics, 32:26, p 46-47.   (View)

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TUNNEL_DIODE_PARAMETERS

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

Provides quantitative measurement of all d-c parameters for the three regions of forward d-c characteristic curve for tunnel diodes.-C. D. Todd, Simple Test Sets Measure Tunnel-Diode Parameters, Electronics, 35:14, p 43-45.   (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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LOGARITHMIC_ATTENUATOR

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

Output of pas sive circuit is proportional to log of input voltages between 0.1 and 100 v. Serves for either positive or negative pulses.-C. D. Nail, Logarithmic Attenuator Spans Three Decades, Electronics, 36:46, p 47-48.   (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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YOKE_DRIVER

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

Used to damp sweep signal voltage to reference voltage during clamping time at end of sweep, while removing clamp during sweep. Diodes D1-D2 and D3-D4, con netted in opposite polarity to each signal line, serve as clamp circuit.-C. E. Veazie, Transistorized Radar Sweep Circuits Using Low Power, Electronics, 32:26, p 46-47.   (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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