Circuit Diagram

AM_BROADCAS_BAND_SIGNAL_GENERATOR

Published:2009/7/10 5:50:00 Author:May

A Hartley oscillator usmg an MPF102 covers the band from 530 to 1600 kHz．T1 is a Toko P/N T1-707VXT1002N 217μhy transformer．   (View)

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Photo_activated_logic_driver_3

Published:2009/7/17 5:15:00 Author:Jessie

Photo-activated logic driver (courtesy Motorola Semiconductor Products Inc.).   (View)

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STEPS_FOR_CURVE_TRACER

Published:2009/7/10 5:49:00 Author:May

Square waves with 1-V amplitude and 1/60-s period, 2 V at 1/30-s, and 4 V at 11-15 s are generated by μL914 MVBR and μL923 flip-flops U2-U4, for combining in simple ladder network to give staircase waveform. Flip-flops count down MVBR output. Complementary-amplifier stage Q10-Q11 drives phase splitter Q12. Output of phase splitter goes through S1 to appropriate current source, Q13-Q14 or Q15-Q16, for supplying base terminal of device under test (DUT). Use 2N3904 for Q10, Q12, Q15, and Q16. Use 2N3906 for Q11, Q13, and Q14,-R. P. Ulrich, A Semiconductor Curve Tracer for the Amateur, QST, Aug. 1971, p 24-28.   (View)

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STAIRCASE_USES_THREE_OPAMPS

Published:2009/7/10 5:47:00 Author:May

Two CA3130 bipolar MOS opamps serve as multivibrator and hysteresis switch, while CA3160 is connected to generate linear staircase wave-form.- Circuit Ideas for RCA Linear ICs, RCA Solid State Division, Somerville, NJ, 1977, p 6.   (View)

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ELECTRONIC_SWITCH_FOR_RADAR_INDICA_TOR

Published:2009/7/17 5:15:00 Author:Jessie

Used to produce aircraft identification markers on ppi. Coincidence of binary voltages supplies gating signals for switch.-J. B. Beach, Coincidence Diodes Gate Electronic Switch, Electronics, 32:8, p 66-68.   (View)

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SIX_STEP_COMPOSITE_VIDEO

Published:2009/7/10 5:46:00 Author:May

Circuit accepts negatively referenced output signals of TV sync generator and delivers 1 V P-P six-step composite video signal to 75-ohm load. 74121 mono changes wide horizontal blanking pulse to correct width for triggering oscillator IC. National LH002C current driver provides low-impedance drive capability for video signal. Used in testing TV sets and VTR decks.-M. J. Salvati, VFO Adds Versatility to TV Sync Generator, EDN Magazine, May 20, 1974, p 70 and 72.   (View)

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Photo_activated_logic_driver_2

Published:2009/7/17 5:14:00 Author:Jessie

Photo-activated logic driver (courtesy Motorola Semiconductor Products Inc.).   (View)

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500_MC_SMALL_SIGNAL

Published:2009/7/10 5:45:00 Author:May

Uses 2N3570 silicon transistor to give 16 db gain.-Texas Instruments Inc., Solid-State Communications, McGraw-Hill,N.Y.,1966,p 259.   (View)

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BASIC_DARIJNGTON

Published:2009/7/10 5:44:00 Author:May

When used as betasquaring circuit, chief drawback is severe change in off'set voltage with temperctture.If base-emitter voltage varies about 2 mv per degree Q, 25℃ temperature change can give output change of 50 mv per stage.-R. C. Going, Temperature.Stabilize d Darlington, EEE, 11:7, p 28-29.   (View)

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VIDEO_SWITCH

Published:2009/7/17 5:14:00 Author:Jessie

Used to either pass to blank out video signals going to ppi visual display. Blanking gate input pulse is applied to switch if video fails to identify itself as signal from associated radar set.-L. Turf, Video Switch for Radar, FEE, 11:2, p 24-25.   (View)

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COMPLEMENTARY_TRANSISTOR_DARLINGTON_

Published:2009/7/10 5:43:00 Author:May

Use of complementary transistors virtually eliminates undesired offset voltages through cancelling action. Germanium transistors may be used in place of silicon units shown.-R. C, Going, Temperature-Stabilized Darlington, EEE, 11:7, p 28-29.   (View)

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Q_MULTIPLIER

Published:2009/7/10 5:43:00 Author:May

Circuit Q in single-coil arrangement is insensitive to drift in trctnsistor parameters, permitting use in filter and oscillator design.-J. R. Woodbury, Simple Transistor Q-Muhiplier or Oscillator, Electronics, 35:22, p 53-54.   (View)

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2712_MC_RETINA_WELDER

Published:2009/7/17 5:13:00 Author:Jessie

Applies r-f energy to spot-weld retina back to original position by creating small burn scars. Crystal-controlled electron-coupled oscillator drives class C power amplifier V2. Sample of output is taken through C3, detected in V8, and applied to grid of V5, which amplifies out put changes and applies them to grid of clamp tube V3 to restore output of V2 to desired level .-O. Rick ,Jr. and R.V. Hill, R-F Spot Welder Reattaches Retina of Human Eye, Electronics, 34:32, p 160-163.   (View)

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PREFERRED_HIGH_IEVEL_CATHODE_POLLOWER

Published:2009/7/10 5:42:00 Author:May

Used to isolate critical circuits from their loads, because it has high input impedance and low output impedance. Not suited for driving low-impedance transmission line, because tube would be severely overloaded.Plate voltage depends on tube used.-NBS, Handbook Preferred Circuits Navy Aero.nautical Electronic Equipment, Vol. I, Electron Tube Circuits, 1963, PC 43, p 43-2.   (View)

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DISTANCE_MARK_GENERATOR_4

Published:2009/7/17 5:12:00 Author:Jessie

Uses switched Hartley oscillator, gated-beam amplifiershaper, and series-triggered blocking oscillator to generate distance marks for 2, 5, and and 25 miles in airborne search radar.-NBS, Handbook Preferred Circuits Navy Aeronautical Electronic Equipment, Vol. 1, electron Tube Circuits, 1963, p N8-3.   (View)

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COMPLEMENTARY_CURRENT_MULTIPLIER

Published:2009/7/10 5:41:00 Author:May

Use of complementary transistor Q4 increases current multiplicotion and increases gain at emitter of Q2 by rctising effective value of RE2. This higher gain makes bootstrapping more effective. Input impedance is 25 meg.Response is 50 cps to 1 Mc.-Texas Instruments Inc., Solid-State Communicotions, McGraw-Hill, N.Y., 1966, p 183.   (View)

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INTEGRATING_OPERATIONAL_AMPLIFIER

Published:2009/7/17 5:12:00 Author:Jessie

Analog-computer type of integrator uses stabilized chopper for integration of dye curve as function of time, in system for measuring dye concentration in blood stream to obtain low rate.-R. L. Skinner and D. K.Gehmlich, Analog Computer Aids Heart Ailment Diagnosis, 32:40, Electronics, p 56-59.   (View)

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500_MC_NEUTRALIZED_AMPLIFIER

Published:2009/7/10 5:40:00 Author:May

Small-signal circuit provides 17 db gain and noise figure of only 3 db. Input impedance is 51 ohms and output impedance is 1,300 ohms in parallel with 1.8 pf. Neutralizing voltage is obtained from coupling loop L3, which is silver-plated strip of beryllium copper run ning parallel to L2.-Texas Instruments Inc., Solid-State Communications, McGraw-Hill, N.Y., 1966, p 299.   (View)

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DISTANCE_MARK_GENERATOR_3

Published:2009/7/17 5:11:00 Author:Jessie

Uses switched Hartley oscillator, amplifier-shaper, and parallel-triggered blocking oscillator to generate distance marks for 10 and 40 miles in air. borne scorch radar.-NBS, Handbook Preferred Circuits Navy Aeronautical Electronic Equipment, Vol. 1, Electron Tube Circuits, 1963, p N8-3.   (View)

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TUNED_RF_WAVEMETER

Published:2009/7/10 5:40:00 Author:May

L1 and L2 form a tuned transformer. About a 1:3 turns ratio is optimum. L2 and C1 tune to the desired frequency. The frequency range can be 10 kHz to over 200 MHz, depending on the value of C1.For HP use, C1 can be a 140-pF variable. For VHF, use about 25 μF. Use of a 2.5 pH RE choke will yield an untuned wavemeter.   (View)

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