Circuit Diagram

Gated_oscillator_using_an_MC1545G_video_amplifier_chip

Published:2009/7/20 23:19:00 Author:Jessie

Gated oscillator using an MC1545G video amplifier chip (courtesy Motorola Semiconductor Products Inc.).   (View)

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SINE_COSINE_OSCILLATOR

Published:2009/7/21 1:44:00 Author:Jessie

Two oscillators in cascade with positive feedback generate two sine waves in quadrature (differing in phase by 90°). Limiting network D1-D2-R5 is used around A2 to prevent oscillator from stabilizing at saturation limit of A2. R5 is used to set output at any level above zener limits of D1-D2. Frequency is 1 kHz for values shown.-W. G. Jung, IC Op-Amp Cookbook, Howard W. Sams, Indianapolis, IN, 1974, p 371-372.   (View)

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Mltiplier_with_op_amp_level_shift

Published:2009/7/21 1:44:00 Author:Jessie

Mltiplier with op amp level shift (courtesy Motorola Semiconductor Products Inc.).   (View)

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BAND_EDGE_MARKER

Published:2009/7/21 1:41:00 Author:Jessie

Series-tuned Colpitts crystal oscillator feeding 10-inch insulated-wire antenna provides sufficient signal radiation for pickup by nearby communication receiver. Used to provide band-edge marker for calibrating receiver tuning dial so receiver meets FCC rules for checking transmitter frequency when using VFO rather than crystal control for Novice transmitter in amateur bands. Crystal can be either for 40- or 80-meter band. Although band-edge frequency is convenient for warning when transmitter is going off frequency, calibration can be done with any frequency in or near band of interest. C5 is 0.25 μF.-K. Negoro, A Band-Edge Marker Generator, QST, April 1973, p 16-17.   (View)

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LAB_GENERATOR_CALIBRATOR

Published:2009/7/21 1:39:00 Author:Jessie

Portable design operating from single flashlight D cell uses National LM3909 flasher IC to produce clean rectangular wave that can be adjusted to exactly 1 V. Pulse width is 1.5 ms and OFF interval between pulses is 5.5 ms. Useful for calibrating oscilloscopes and adjusting their probes. Article describes operation of circuit in detail, Current drain is low enough to give 500 h of operation.-P. Lefferts, Power-Miser Flasher IC Has Many Novel Applications, EDN Magazine, March 20, 1976, p 59-66.   (View)

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UNIVERSAL_TEST_OSCILLATOR

Published:2009/7/21 1:38:00 Author:Jessie

Crystal is in feedback path of Pierce oscillator, between base and collector of al, with 2.5-mH RF choke in place of tuned collector circuit. Oscillator works from 400 kHz to 20 MHz, depending on crystal. Designed for fundamental crystals; third overtone types will oscillate but at fun-damental. Value of 01 is for 1 MHz and higher; increase to 330 pF for lower frequencies. An-tenna can be 20-inch wire; increasing length increases signal radiation. Can be used as signal source for receiver alignment (with either radiated or probe-coupled signal), as marker generator, or in combination with station receiver as code-practice oscillator.-D. DeMaw, Build a UTO-1, QST, Oct. 1977, p 19-21.   (View)

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455_kHz_FOR_IF_ALIGNMENT

Published:2009/7/21 1:37:00 Author:Jessie

Simple crystal-controlled signal generator serves for aHgning IF strips. Amplitude modulator uses Colpitts 1-kHz oscillator circuit, with surplus 88-mH toroid in tank circuit; tie two adjacent leads together to provide center tap. T1 is 455-kHz IF transformer from AM transistor radio, used to tune drain circuit and obtain low output impedance. Current drain is about 7 mA with 12-V supply and 5 mA with 9-V battery.-C. Hall, 455-kHz 1-F Alignment Signal Generator, Ham Radio, Feb. 1974, p 50-52.   (View)

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Arc_tangent_function_from_the_4301_multifunction_chip

Published:2009/7/21 1:37:00 Author:Jessie

Arc tangent function from the 4301 multifunction chip (courtesy Burr-Brown Research Corporation).   (View)

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Sine_function_from_the_4301_multifunction_chip

Published:2009/7/21 1:36:00 Author:Jessie

Sine function from the 4301 multifunction chip (courtesy Burr-Brown Research Corporation).   (View)

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25_kHz_CALIBRATOR

Published:2009/7/21 1:36:00 Author:Jessie

Addition of one 7473 dual JK flip-flop IC to circuit of Radio Shack 28-140 100-kHz calibrator kit provides conversion to 25 kHz for checking frequency settings of am-ateur receivers. Amplitude of output is 5 V P-P square wave with rich harmonic content. Originally designed for use with HW-8 Heathkit am ateur receiver. Output of calibrator is coupled to receive side of antenna relay through 10-pF capacitor. Article covers initial calibration.-D. Karpiej, A 25-kHz Calibrator for the HW-8, QST, Oct. 1978, p 20-21.   (View)

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Square_rooter_circuit_using_the_435_multiplier_divider_chip

Published:2009/7/21 1:35:00 Author:Jessie

Square rooter circuit using the 435 multiplier/divider chip (courtesy Analog Devices, Inc.).   (View)

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Divider_circuit_with_digitally_controlled_gain

Published:2009/7/21 1:34:00 Author:Jessie

Divider circuit with digitally controlled gain (courtesy Analog Devices, Inc.).   (View)

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TRACKING_GENERATOR

Published:2009/7/21 1:34:00 Author:Jessie

Used with spectrum analyzer to generate CW signal corresponding to frequency to which analyzer is tuned, for evaluation of filter response.Q1 and Q2 provide gain and isolation between 200-MHz oscillator, Q3 and first IF amplifier of analyzer. R1 provides fine tuning. MX1 mixes 200-MHz output with signal from 200-300 MHz first local oscillator to provide 100-kHz to 100-MHz tracking signal. Optional 130-MHz low-pass filter attenuates 400-500 MHz component generated by mixer in tracking generator-W, Ryder, Spectrum Analyzer Tracking Generator, Ham Radio, April 1978, p 30-32.   (View)

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SERIES_DIODE_MAGNETRON_MODULATOR

Published:2009/7/21 0:08:00 Author:Jessie

In variation of spark-gap modulator, 25 pnpn diodes in series with pulse-forming networks (PFN) are switched by trigger and resulting voltage transient to supply 8,700 v at 35 amp to load. Success depends on availability of 700-v diodes.-F. A. Gateka and M. L. Embree, Semiconductor Modulators for Modern Magnetrons, Electronics, 35:37, p 42-45.   (View)

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PULSE_TIME_MODULATOR_USES_TWO_QUAD_RANT_MULTIPLIER

Published:2009/7/21 0:07:00 Author:Jessie

Output transistor Q3 servas as series switch driven by Q2 and magnetic modulator to give accurate analog multiplication.-W. R. Seegmiller, Accurate Analog Computation with Pulse-Time Modulation, Electronic, 35:13, p 54-57.   (View)

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CHOPPER_MODULATOR

Published:2009/7/21 0:06:00 Author:Jessie

Reduces output signal null level by balancing out zero input signal. Null levels con be maintained in microvolt region by proper shielding. Long time drift stability is less than 1 my referred to output. Used with strain gage and other low-level transducer signals.-L. S. Klivans, Modulators for Automatic Control Systems, Electronics, 31:1, p 82-84.   (View)

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BALANCED_TRIODE_SINE_WAVE_MODULATOR

Published:2009/7/21 0:04:00 Author:Jessie

Gives sinusoidal output without filtering-Can be used for either open-loop or error signal modulation when high input impedance and low-distortion sinusoidal output are required. Long-term drift stability is less than 1 mv per hour referred to output.-L. S. Klivans, Modulators for Automatic Control Systems, Electronics, 31:1, p 82-84.   (View)

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LINEAR_PWM_FOR_05_TO_175_V

Published:2009/7/21 0:03:00 Author:Jessie

Tubes V4 and V5 form bistable mvbr that will accept modulation voltage range of 350:1 from 0.5v to175 v, at point A. V3 is Miller ntegrator．Wilh 0.055 mfd for C1, pulse lengths are 61 and 173 millisec for limits of modulation voltage. Linearity is nearly perfect．-J，E，Frecker, A Pulse Width modulator, EEE, 10:12,p 28-300   (View)

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2_KV_MODULE_OF_MAGNETRON_MODULATOR

Published:2009/7/21 0:02:00 Author:Jessie

With terminal 6 at +2,000 v, voltage-regulator diodes maintain 400 v across each pnpn transistor. Lowest transistor receives 0.5.amp, 3-v trigger at its gate.-F. A. Gateka and M. L. Embree, Semiconductor Modulators for Modern Magnetrons, Electronics, 35:37, p 42-45.   (View)

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HYBRID_DIODE_TUBE_PULSE_MODULATOR

Published:2009/7/21 0:01:00 Author:Jessie

Closely spaced pulses of any length, with 15-nsec rise and fall times al 550 V and 1.4 amp are produced for modulating traveling-wave tube by combining fast response of four-layer diodes with current-handling capabilities of tubes.-E. H. Heckman, Three New Approaches to Pulse Modulation, Electronics, 36:18, p 62-64.   (View)

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