TUNER_FOR_A_M_F_M_PORTABLE

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

R-f amplifier Q1, mixer Q2, and local oscillator Q3 are all switched to perform same functions on f-m as on aim. Grounded-base oscillator Q3 requires careful design to compensate for transconductance phase shift at highest frequency of oscillation (118.7 Mc), Overall gain of tuner is 25.5 db at 88 Mc and 22.5 db at 108 Mc.-R. A. Santilli and H. Thanos, Portable Radio Uses Drift-Field Transistors, Electronics, 33:28, p 48-50.   (View)

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24_MC_CLAPP_1

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

Delivers 300 mw into 50-ohm load. Typical collector efficiency is 35%. -Texas Instruments Inc., Solid-State Communications, McGraw-Hill, N.Y., 1966, p 239.   (View)

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RF_oscillator_

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

This circuit uses the LM3909 as a low-power RF oscillator (chapter 5). The tuned circuit is a standard AM-radio ferrite antenna coil (loopstick) with a tap 40% of the turns up from one end. The tuning capacitor is a standard 360-pF AM-radio tuning capacitor The high-frequency limit is about 800 kHz.   (View)

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DELAY_LINE_OSCILLATOR

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

Tunnel-diode oscillator with General Radio 314-586 delay line produces square-wave output in range of 0.5 to 20 Mc.- Transistor Manual, Seventh Edition, General Electric Co., 1964, p 352.   (View)

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9_KC_INDUCTION_RECEIVER

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

Thermistor network in base circuits of transistors provide thermal compensation between -30 and +140°F, for picking up messages broadcast from roadside telephone-line loops.-E. A. Hanysz, J. E. Stevens, and A. Meduvsky, Communication System for Highway Traffic Control, Electronics, 33:42, p 81-83.   (View)

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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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SSB_PRODUCT_DETECTOR

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

Square-law relationship between transconductance and drain current makes mos fet ideal for product detector in ssb receivers.-G. G. Luettgenau and S.H. Branes, Designing With Low-Noise MOS FETs: A Little Different But No Harder, Electronics, 37:31, p 53-58.   (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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LOAD_ISOLATING_3_35_MC_OSCILLATOR

Published:2009/7/19 23:13:00 Author:Jessie

Refined version of Lampkin variable r-f oscillator for dual-conversion receiver gives uniform output over band and sufficient stability for single-sideband reception after 30-see warmup.-E. Robberson, R-F Oscillator has improved Stability, Electronics, 36:32, p 62-63.   (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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FOUR_TRANSISTOR_REFLEX_PORTABLE

Published:2009/7/19 23:11:00 Author:Jessie

Second if stage doubles as audio amplifier to give five-stage performance.-E. Gottlieb, Transistor Reflex Circuit Trims Receiver Costs, Electronics, 31:1, p 66-68.   (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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VOLTAGE_TUNABLE_CARCINOTRON_CONTROL

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

Used with superheterodyne receiver to provide continuous frequency coverage from 30 Mc to 75,000 Mc by means of harmonic mixing.-C. H. Currie, Carcinotron Harmonics -. Boost Receiver Range, Electronics, 32:9, p 58-61.   (View)

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FM_tuning_indicator_circuit_using_an_ECG1149_14_pin_DIP

Published:2009/7/19 23:05:00 Author:Jessie

FM tuning indicator circuit using an ECG1149 14-pin DIP.Recommended supply voltage is 12 volts.Lamp turn-on voltage at 10.7 MHz is 10 mV(courtesy GTE Sylvania Incorporated).   (View)

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FM_IF_amplifier_for_FM_broadcast_receiver

Published:2009/7/19 23:04:00 Author:Jessie

FM IF amplifier for FM broadcast receiver.Supply voltage can be between 6 and 12 volts,the typical being 7.5 volts,Voltage gainis between 55 and 67 dB,depending on the IF(courtesy GTE Sylvania Incorporated).   (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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