Oscillator Circuit

PREFERRED_2000_83000_PPS_BLOCKING_OSCILLATOR

Published:2009/7/19 23:18:00 Author:Jessie

Parallel-triggered circuit responds to trigger pulses separated by only few microsec, as required for distance-mark generators and pulse coding circuits. Input is positive, with minimum of 15 V, and output is positive. R6 is 220 ohms. R7 is maximum that will just suppress ringing.-NBS, Handbook Preferred Circuits Navy Aeronautical Electronic Equipment, Vol. I, Electron Tube Circuits, 1963, PC 47, p 47-2.   (View)

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200_400_Mc_VARICAP_TUNED_OSCILLATOR_

Published:2009/7/19 23:15:00 Author:Jessie

Tuning range is achieved by adjusting Voricap bias voltage from 0.4 to 60 V.-E. Gottlieb and J. Giorgis, Tunnel Diodes-Using Them as Sinusoidal Generators, Electronics, 36:24, p 36-42.   (View)

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ELECTRIC_TUNING_FOR_600_to_1200_MC

Published:2009/7/19 23:27:00 Author:Jessie

Lumped-constant technique is used with voltage-tunable ferroelectric capacitors to provide 10 mw into 50 ohms.-T. W. Buller, Jr., Ferroelectrics Tune Electronic circuits, Electronics, 32;3, p 52-55.   (View)

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SIMPLE_TRANSISTOR_OSCILLATOR

Published:2009/7/19 23:26:00 Author:Jessie

Current gain is stabilized against transistor variation. Can be used over collector voltage range of 2 to 24 V. Oscillation occurs at frequency at which there is 360° total phase shift, 180° of which is furnished by grounded-emitter amplifier and 180° by high-pass network. 5K pot adjusts frequency from about 200 to 400 cps.- Tansistor Manual, Seventh Edition, General Electric Co., 1964, p 206.   (View)

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CHATTER_JAMMER

Published:2009/7/19 23:14:00 Author:Jessie

Can be used to create pleasing tone at level that drowns out ambient noises, to permit concentration on problem while others are talking in vicinity.-J. Leeb, A Chatter Jammer Circuit, EEE, 10:11, p 31.   (View)

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TONE_BURST_OSCILLATOR

Published:2009/7/19 23:12:00 Author:Jessie

Consists of variable-frequency magnetically coupled mvbr, with two magnetic cores driven by battery-powered transistors. Injection of current or voltage from solar cell or other transducer affects mvbr reset, to give frequency change over range of 5 to 15 kc.-R. W. Rochelle, Cyclops Cores Simplify Earth-Satellite Circuits, Electronics, 31:9, 56-63.   (View)

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STABLE_OSCILLATOR

Published:2009/7/19 23:09:00 Author:Jessie

Excellent frequency and amplitude stability is accomplished by eliminating all grid current in tank circuit and by isolating tank from driving tube by means of resistive degeneration. If very pure sine wove is required, grid of V1 should be coupled to high-impedance load that is equivalent constant resistance, because either reacyive or variable loads will impair stability.-J. C. Davis, Stable Oscillator Circuit, EEE, 11:2, p 26.   (View)

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FOUR_LAYER_DIODE_OSCILLATOR

Published:2009/7/19 23:07:00 Author:Jessie

If circuit is broken at X, discharge current of C1 can be used to shut off transistor stage.-A. G. Lloyd, Overload Protection for Transistor Voltage Regulators, Electronics, 33:52, p 56-59.   (View)

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THREE_STAGE_VARIABLE_FREQUENCY_CRYSTAL_OSCILLATOR

Published:2009/7/19 23:03:00 Author:Jessie

Provides loop transmission of 1, under maximum frequency pulloff of 5 cps from 9.1-kc crystal frequency, and has net phase shift around loop of 360°with crystal in circuit. Third stage provides extra circuit gain needed for larger power output or larger frequency deviations off resonance. Transformer provides phase reversal and reflects desired a-c load, to limit output swing of transistor.-G. A. Gedney and G. M. Davidson, Crystal Oscillator has Variable Frequency, Electronics, 31:7, p 118-119.   (View)

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MEASURING_OSCILLATOR_STABILITY

Published:2009/7/19 23:02:00 Author:Jessie

Circuit is used as 90.3125-Mc reference oscillator in system for measuring short-term stability of 45-Mc stalo (stable local oscillator) of airborne radar under high vibration. Tape transformer in collector circuit of transistor controls crystal drive.-J. Coolican, How to Measure STALO Short-Term Stability Under Vibration, EEE, 13:5, p 96-98.   (View)

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VOLTAGE_CONTROLLED_23_MC_OSCILLATOR_AND_MODULATOR

Published:2009/7/19 23:01:00 Author:Jessie

Input signal voltage to transistor changes capacitance of tank circuit, to make oscillator frequency vary with input signal voltage. Variable-capacitance diode requires fewer parts than transistor modulator. Zener diodes provide constant bias for variable-capacitance diode D2.-F. L. Carroll, How to Achieve Stability in Space Telemetry, Electronics, 37:4, p 32-35.   (View)

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FREE_RUNNING_CASCODE_OSCILLATOR

Published:2009/7/19 22:59:00 Author:Jessie

Omission of voltage-divider capacitors from cascode multivibrator gives sine-wave oscillator if loop gain is equal to unity.-C. Sing, Advantages of Free-Running Cascode Multivibrators, Electronics, 37:5, p 28-29.   (View)

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100_KC_MAGNETOSTRICTIVE_ROD_CONTROL_

Published:2009/7/19 22:58:00 Author:Jessie

Oscillator Q1 can be adjusted to within 0.1 cps of desired frequency by adjusting length and center thickness of rod made from modified Elinvar constant-modulus material positioned between coils. Emitter-follower Q2 minimizes pulling by variable load. -T. A O. Gross, New Magnetic Rods Simplify Circuits, Electronics, 35:28, p 62-66.   (View)

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COLPITTS_1_to_20_MHz_CRYSTAL_OSCILLATOR

Published:2009/7/10 2:21:00 Author:May

This is a simple Colpitts crystal oscillator for 1 to 20 MHz, can be easily made from junk-box parts(provided that a crystal is handy).   (View)

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UNIJUNCTION_TRANSISTOR_OSCILLATOR

Published:2009/7/19 22:57:00 Author:Jessie

If circuit is broken at X, discharge current of C1 can be used to shut off transistor stage. -A. G. Lloyd, Overload Protection for Transistor Voltage Regulators, Electronics, 33:52, p 56-59.   (View)

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SIMPLE_THIRD_OVERTONE_OSCILLATOR

Published:2009/7/10 2:18:00 Author:May

Using a 210-MHz third overtone crystal，this circuit operates directly at the crystal frequency，with210-MHz output and no multiplier stages.   (View)

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SIMPLE_FUNDAMENTAL_CRYSTAL_oscILLATOR

Published:2009/7/10 2:17:00 Author:May

This simple fundamental oscillator uses a μPC1651G IC and two components. The crystal is funda-mental.   (View)

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NR_DIODE_AS_R_F_OSCILLATOR

Published:2009/7/19 23:25:00 Author:Jessie

Simple negative-resistance diode circuit can develop several milliwatts at frequencies up to 300 Mc.-A. P. Schmid, Jr., Negative-Resistance Diode Handles High Power, Electronics, 34:34, p 44-46.   (View)

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CB_CRYSTAL_OSCILLATOR

Published:2009/7/19 23:24:00 Author:Jessie

Uses low-cost crystal having high series resistance, up to 30 ohms. Provides adequate output to supply most master oscillator-power amplifier applications. Output tap is arranged to match directly a companion 2N2195 grounded-base amplifier. Crystal is 3rd overtone type.- Transistor Manual, Seventh Edition, General Electric Co., 1964, p 211.   (View)

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SATURABLE_REACTOR_OSCILLATOR

Published:2009/7/19 23:21:00 Author:Jessie

Timebase integration of a variable is performed by counting cycles of saturable-reactor oscillator whose frequency is proportional to the variable. linearity is within 1% of full scale.-L. W. Langley, Saturable-Core Oscillator Integrates Gas-Flow Data, Electronics, 32:4, p 42-43.   (View)

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