Signal Processing

STABLE_10_KC_COLPITTS

Published:2009/7/19 22:10:00 Author:Jessie

Provides constant-amplitude carrier for data reduction system, at 0.5 V rms with amplitude stability of 0.l% and frequency drift below 0.25% for temperature range of 30 to 50℃.-L. H. Dulberger, Transistor Oscillator Supplies Stable Signal, Electronics, 31:5, p 43.   (View)

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SIMPLE_WIEN_BRIDGE_OSCILLATOR

Published:2009/7/10 2:35:00 Author:May

In this circuit, the Wien-bridge network provides phase shift, and the lamp regulates the amplitude of the oscillations. The smooth, limiting nature of the lamp's operation, in combination with its simplicity, gives good results. Harmonic distortion is below 0.3%   (View)

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PREFERRED_PARALLEL_TRIGGERED_BLOCKING_OSCILLATOR_BELOW_2000_PPS

Published:2009/7/19 22:09:00 Author:Jessie

Produces synchronizing impulses between 0.2 and 7 microsec wide at rates of 200 to 2,000 pps. One triode section is used as trigger amplifier to prevent triode blocking oscillator from reacting on trigger source. R6 and R7 are 100 ohms for 5814A and 150 ohms for 6111. R8 should be maximum that will just suppress ringing. Requires positive input trigger and gives choice of output polarities at the four output terminals.-NBS, Handbook Preferred Circuits Navy Aeronautical Electronic Equipment, Vol. I, Electron Tube Circuits, 1963, PC 46, p 46-2.   (View)

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ANEMOVANE_AUDIO_OSCILLATOR

Published:2009/7/19 22:07:00 Author:Jessie

Used for telemetering wind velocity. Cam switch closes for each mile of wind that passes the anemometer cups, applying voltage to C1 and C2 in series and making Q1 conduct and pull in K1. This energizes velocity audio oscillator of telemetry system.-R. Beaulieu and G. Neal, Wind Velocity Telemetering System, Electronics, 33:29, p 68-70.   (View)

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VOLTAGE_CONTROLLED_CRYSTAL_OSCILLATOR

Published:2009/7/10 2:30:00 Author:May

  (View)

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60_MC_COMMON_BASE_1_

Published:2009/7/19 22:07:00 Author:Jessie

Delivers 10 mw to 50-ohm load at 25℃. Collector efficiency is 10%.-Texas Instruments Inc., Solid-State Communications, McGraw-Hill, N.Y., 1966 p 239.   (View)

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100_MHz_OVERTONE_OSCILLATOR

Published:2009/7/10 2:28:00 Author:May

This oscillator circuit uses a 5th overtone crystal in the 85-to-106 MHz range. Y1 ii the crystal. The circuit was originally used to frequency control a microwave oscillator.   (View)

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OSCILLATOR_D_E_T_E_C_T_O_R

Published:2009/7/19 22:06:00 Author:Jessie

Capacitor microphones form part of grid tank circuit of 6-Mc tuned-plate tuned-grid r-f oscillator that also detects 6.5-cps modulation by class-C operation during oscillation. Used in infrared analyzer for detecting leaks in automobile airsuspension systems.-P. G. Balko, Infrared Finds Auto Suspension Leaks, Electronics, 31:49, p 82-85.   (View)

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60_MC_COMMON_BASE

Published:2009/7/19 22:04:00 Author:Jessie

Delivers 10 mw to 50-ohm load at 25℃. Collector efficiency is 10%.-Texas Instruments Inc., Transistor Circuit Design, McGraw-Hill, N.Y., 1963, p 320.   (View)

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5_CPS_TO_300_KC

Published:2009/7/19 22:03:00 Author:Jessie

Overcomes low-frequency problems of wide-range oscillators by using tank both for controlling frequency and coupling signal to next stage. Frequency is stable over wide variations in d-c voltage and temperature, yet circuit is inexpensive. Alternative output coupling shown is useful for driving varying loads.-J. Freeman, Low-Frequency C-Coupled Oscillator, EEE, 11:7, p 27-28.   (View)

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VOLTAGE_CONTROLLED_BUTLER_OSCILLATOR_

Published:2009/7/19 22:02:00 Author:Jessie

Provides 70% frequency deviation. When tuned to 2 Mc, frequency deviation is -205 kc at 0 V control input and +1,289 kc at 20 V, though frequency deviation is not linearly proportional in lower half of voltage range. -C. F. Turner, Wide-Range, Voltage-Controlled Oscillator, EEE, 10:10, p 31.   (View)

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RESISTANCE_CONTROLLED_OSCILLATOR

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

Both positive and negative feedback loops ore used, with notch network as frequency-determining element. Incandescent lamp in forward loop give amplitude stabilization. Tuning network contains resistance-to-frequency tranducers.-V. C. Vanderbilt and C. L. Zimmer, Magnetic Tape Recorder Programs Engine Dynamometer Tests, Electronics, 33:51, p 74-77.   (View)

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30_MC_WIDE_TEMPERATURE_RANGE

Published:2009/7/19 21:57:00 Author:Jessie

Operates over range of -40 to +60℃. Typical power output is 23 mw at lowest temperature and 20 mw at highest. Collector efficiency is 30%.-Texas Instruments Inc., Solid-State Communications, McGraw-Hill, N.Y., 1966, p 239.   (View)

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27255_MC_TUNNEL_DIODE_CRYSTAL_OSCILLATOR

Published:2009/7/19 21:56:00 Author:Jessie

Operates within tolerance of quartz crystal from -55 to + 85℃ and bias range of 110 to 150 mv for Citizens Band service. - Transistor Manual, Seventh Edition, General Electric Co., 1964, p 353.   (View)

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VOLTAGE_CONTROLLED_VFO

Published:2009/7/19 21:55:00 Author:Jessie

Adding 10K resistor to basic ujt oscillator gives voltage-controlled variable-frequency oscillator. With 0.68 mfd for C, d-c input voltage range of 0 to 30 V gives 670 to 4,550 pps. With 0.2 mfd for C, same input range gives 220 to 1,400 pps. Not intended for use where linearity is important.-B. Strunk, Voltage-Controlled Variable-Frequency Oscillator, EEE, 10:12, p 28-30.   (View)

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MULTIPLE_FEEDBACK_R_C_OSCILLATOR

Published:2009/7/19 21:54:00 Author:Jessie

Gives excellent amplitude stability and low distortion. Uses vibration and shockproof version of Sulzer bridged-T configuration to provide single-frequency operation in 4-cps to 350-kc range.-L. H. Dulberger, Improved R-C Oscillator, Electronics, 32:10, p 62.   (View)

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SYNCHRONIZED_OSCILLATOR

Published:2009/7/19 22:30:00 Author:Jessie

Astable mvbr Q1-Q2 operating at68.4 kc is synchronized by 400-cps signal having 6-microsec pulse width. Frequency stability can be one part in 4,000 if film resistors and other temperature-stable components are used. Synchronizing signal is variable, of the order of 1/170 of oscillator frequency but with no integral relationship between the signals.-G. Silver-man. A Synchronized Oscillator Circuit, EEE, 10:7, p 29-30.   (View)

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MEASURING_SIGNALS_IN_NOISE

Published:2009/7/19 22:34:00 Author:Jessie

Lock-in amplifier beats desired weak signal (40 db below input noise level) with reference signal of same frequency, to give d-c cutout that can be measured or recorded, as required in radio astronomy. Bandwidth is variable down to 0.12 cps for tuning range of from 15 to 15,000 cps. Also used for checking oscillafor frequency against WWV to one part in 1010.-R. D. Moore, Lock-In Amplifier for Signals Buried in Noise, Electronics, 35:23, p 40-43.   (View)

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7413_MC_CRYSTAL_REPLACES_LOST_MICRO_WAVE_CARRIER

Published:2009/7/19 22:33:00 Author:Jessie

To prevent noise interference during signal losses due to fading, carriet resupplies oscillator, and amplifier replaces lost carrier, within 0.1 millisec. Q1 and Q2 are switched from cutoff when carrier is needed. Resistor RF in series with crystal lowers its Q to insure rapid starting. -Microwave Relay Designing with Traveling-Wave Tubes, Electronics, 35:3, p 40-43.   (View)

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10_KC_SINGLE_TRANSISTOR_COLPITTS

Published:2009/7/19 22:32:00 Author:Jessie

Total temperature drift rate is only 0.035%/℃, determined by coil core material. For higher frequency stability, frequency-determining network should be buffered from amplifier. - Transistor Manual, Seventh Edition, General Electric Co., 1964, p 210.   (View)

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