Signal Processing

LINEAR_VCO_1

Published:2009/7/14 4:44:00 Author:May

Operates over control-voltage range of +10 mV to +10 V to provide either square or triangle outputs from 5 Hz to 5 kHz, Can be used for instrumentation or electronic music applications.- W. G. Jung, IC Timer Cookbook, Howard W. Sams, Indianapolis, IN, 1977, p 174-179.   (View)

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FILM_TIMING_MARK_GENERATOR

Published:2009/7/14 4:33:00 Author:May

Instrumentation recorder for plasma studies uses discharge of capacitor at beginning of each plasma pinch discharge to trigger lash tube, light from which is chopped by glass disk driven at constant speed by synchronous motor.-J. J. Pearson, Instrumentation for Plasma Propulsion, Electronics, 33:24, p 66-69.   (View)

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LINEAR_VCO

Published:2009/7/14 4:40:00 Author:May

Two sections of LM3900 quad linear opamp provide linear response for inputs of 2-12 VDC, Circuit can be adjusted with 1-megohm pot so 4-V input produces 400-Hz square wave at output, 5 V gives 500 Hz, etc. First opamp is connected as integrator and second as Schmitt trigger. When Schmitt output is high, transistor is turned on and diverts current away from noninverting input so integrator output ramps down toward ground.-C. Sondgeroth, More PLL Magic, 73 Magazine, Aug. 1976, p 56-59.   (View)

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COLLECTOR_VOLTAGE_CONTROL_AFC_OSCILLATOR

Published:2009/7/15 3:36:00 Author:Jessie

Afc input signal acts through series resistor to vary collector voltage of 40.Mc oscillator. Sensitivity is 2.5 Mc per V. Bias network adjustment is critical.-T. P. Prouty, Using Varactors to Extend Frequency-Control Range, Electronics, 36:45, p 48-49.   (View)

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VARACTOR_CONTROLLED_40_MC_OSCILLATOR_

Published:2009/7/15 3:35:00 Author:Jessie

Oscillator transistor also acts as a d-c amplifier between afc input and varactor diode to give electronic tuning over range of 11 Mc with sensitivity of 5.8 Mc per v.-T. P. Prouty, Using Varactors to Extend Frequency-Control Range, Electronics, 36:45, p 48-49.   (View)

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BALANCED_PARAMETRIC_DOUBLER

Published:2009/7/15 3:04:00 Author:Jessie

Handles twice the power of single-ended circuit using same varactor diode, while doubling 125-Mc input. Varactors VC are PSI type PC116.Efficiency is 70%. Transformer winding data is given in article.-R. D. Gromer, VHF Balanced Parametric Doubler, EEE, 11:8, p 30-31.   (View)

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VHF_VARACTOR_QUADRUPLER

Published:2009/7/15 3:03:00 Author:Jessie

Supplies 160 Mc at up to 0.5 w. Output impedance is 50 ohms.-R. C. Wonson, Designing VHF Valactor Multipliers, FEE, 11;12, p 48-52.   (View)

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A_F_DOUBLER

Published:2009/7/15 3:03:00 Author:Jessie

Frequency of sinusoidal signal is doubled with only one transistor, one coupling capacitor, and four resistors, by utilizing nonlinear characteristic of transistor for half-wave rectification. Purity of output waveform is adjusted with feedback control R1.-R. J. Miller, Jr., Audio Frequency Doubling Without Bulky filters, EEE, 12:12, p 57.   (View)

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50_MC_TO_100_MC_VARACTOR_DOUBLER

Published:2009/7/15 3:02:00 Author:Jessie

Used to extend usefulness of conventional time marker generator.-R. M. Zilberstein, Frequency Doublet and Amplifier, EEE, 12:12, p 57.   (View)

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21_MC_TO_42_MC_DOUBLER

Published:2009/7/15 3:01:00 Author:Jessie

Combination series-parallel trap in collector circuit provides 50 db rejection of fundamental in output that is tuned to second harmonic.-Texas Instruments Inc., Transistor Circuit Design, McGraw-Hill, N.Y., 1963, p 328.   (View)

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TRIPLER_DOUBLER_GIVES_700_1200_MC

Published:2009/7/15 2:59:00 Author:Jessie

First stage is grounded-grid amplifier, with plate tuned by 1-turn coil and variable capacitor. Common-grid tripler and doublet are tuned with coaxial resonators. –A. E. Anderson and H. D. Hern, F-M Exciter For Sight or Scatter Systems,Electronics,31:11, p 148-151.   (View)

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DECADE_DRIVER_FOR_FREQUENCY_MULTIPLIER_

Published:2009/7/15 2:57:00 Author:Jessie

Input signal from frequency-multiplying oscillator is stepped up to 80 v peak-to-peak, with 1-microsec rise time, for accurate triggering of decade counter.-W. O. Brooks, Stepping up Frequency with Counter Circuits, Electronics, 32:29, p 60-62.   (View)

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RANDOM_FLASH_GENERATOR

Published:2009/7/14 4:32:00 Author:May

Multivibrators generate single pulse to drive flash tube at unspecified time of from 2 to 10 seconds after switch is closed.-P. Scott, Microflash and Pulse Stimulator Tests Human Response, Electronics, 34:27, p 48-51.   (View)

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SIMPLE_DOUBLER

Published:2009/7/15 2:57:00 Author:Jessie

Uses distributed R.C networks consisting of resistive and conductive layers on dielectric substrate, with d-c applied between electrodes at 65 v for doubling frequency of ceramic-dielectric 400-cps oscillator.-M. M. Perugini, Race to Reduce Capacitor Size, EEE, 10:7, p 61-64.   (View)

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50_150_MC_TRIPLER

Published:2009/7/15 2:56:00 Author:Jessie

Charge-storage 1N4386 varactor triples frequency with power efficiency of 70% for input of 50 watts.-G. Schaffner, Charge Storage Vcractors Boost Harmonic Power, Electronics, 37:20, p 42-47.   (View)

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EMITIER_CURRENT_CONTROL_40_MC_AFC_OSCILLATOR

Published:2009/7/15 3:34:00 Author:Jessie

Error signal, usually derived from external discriminator, is applied in series with base bias network to give sensitivity of about 1.5 Mc per v and nearly straight voltage-frequency characteristic.-T. P. Prouty, Using Varactors to Extend Frequency-Control Range, Electronics,36:45, p 48-49.   (View)

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TRIGGERED_BLOCKING_OSCILATOR

Published:2009/7/14 4:20:00 Author:May

Gives pair of output pulses, with opposite polarity, for controlling timing and spacing of flashes.-P. Scott, Microflash and Pulse Stimulator Tests Human Optical Response, Electronics, 34:27, p 48-51.   (View)

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HYSTERESIS_AND_DELAY_OSCILLATOR

Published:2009/7/15 4:59:00 Author:Jessie

Separate noninteracting frequency and duty-factor controls permit construction of simple telemetry oscillators having inherently linear transfer function. Absolute synchronization of independent and dependent variables is obtainable with relatively simple pulse-generating circuits. Synchronization cannot be lost. Average value of threshold voltage is maintained constant. Adjustment of hysteresis gap width moves threshold voltage limits symmetrically about average value. Resistance portion of RC delay is switched from positive to negative voltage symmetrically also. Article covers circuit operation in detail.-W. H. Swain, True Digital Synchronizer Employs Hysteresis-and-Delay Element, EDN Magazine, Jan. 1, 1971, p 33-35.   (View)

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INDEPENDENT_ON_AND_OFF_PERIODS

Published:2009/7/15 4:55:00 Author:Jessie

High input resistance of CA3130 opamp permits use of high RC ratios in timing circuits, to give pulse period range of 4 μs to 1 s with switch-selected capacitors.- Circuit Ideas for RCA Linear ICs, RCA Solid State Division, Somerville, NJ, 1977, p5.   (View)

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CURRENT_CONTROLLED_OSCILLATOR

Published:2009/7/14 4:06:00 Author:May

Makes use of proportional relationship between input current li and amplifier input bias current lABC of CA3094 programmable opamp. Linearity is within 1% over middle half of characteristic. Circuit can be used for voltage input if voltage is applied to pin 5 through appropriate dropping resistor R. Output is square wave. - Circuit Ideas for RCA Linear ICs, RCA Solid State Division, Somerville, NJ, 1977, p4.   (View)

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