Self_generating_FSK_

Published:2009/7/17 3:13:00 Author:Jessie

Self-generating FSK (courtesy Motorola Semiconductor Products Inc.).   (View)

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Voltage_controlled_Butterworth_filter

Published:2009/7/17 3:12:00 Author:Jessie

This circuit uses both sections of an XR-13600 (Fig. 11-1B) to form a 2-pole Butterworth low-pass filter. EXAH Corporatton Databook 1990, p 5-254   (View)

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MICROMICROAMMETER

Published:2009/7/17 3:12:00 Author:Jessie

Uses vibrating capacitor, electrometer amplifier, and electronic servo in which amplifier attempts to maintain input at ground potential regardless of magnitude of voltage developed across input resistor by very small signal current being measured.-G. C. Carroll, Industrial Instrument Servicing Handbook, McGraw-Hill, N.Y., 1960, p 6-6.   (View)

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Voltage_controlled_high_pass_filter

Published:2009/7/17 3:12:00 Author:Jessie

This circuit is similar to that of Fig. 11-9, except that the single RC rolloff is below the defined cutoff frequency. EXAR corpora,ion Databook, 1990 p 5-254   (View)

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CLOCK_FOR_REGULATED_SUPPLY

Published:2009/7/11 2:00:00 Author:May

Single RCA CD4009A serves as clock generator and mono for driving regulated power supply having fold-back current-limiting protection. Rtc and Ctc are maior frequency-determining components. RS should be made equal to or greater than 2Rtc, Article gives equation for period T of oscillator, which ranges from about 2.2 to 2.5 times Rtc Ctc.-J. L. Bohan, Clocking Scheme Improves Power Supply Short-Circuit Protection, EDN Magazine, March 5, 1974, p 49-52.   (View)

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MMIC_AMPLIFIER_MIXER

Published:2009/7/17 3:11:00 Author:Jessie

This figures shows a simple mixer using an MMIC amplifier   (View)

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Voltage_controlled_low_pass_filter

Published:2009/7/17 3:10:00 Author:Jessie

This circuit performs as a unity-gain buffer amplifier at frequencies below cutoff, with the cutoff frequency being the point at which XC/gm equals the closed-loop gain of (R/RA). At frequencies above cutoff, the circuit provides a single RC rolloff (6 dB per octave) of the input signal with a -3-dB point that is defined by the given equation, where gm (of the XR-13600, Fig. 11-1B) is 19.2× IB at room temperature. EXAR Corporaton Databk 1990, p 5-254.   (View)

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NE602_RF_TRANSLATOR_CIRCUIT

Published:2009/7/17 3:09:00 Author:Jessie

This circuit shows how an NE602 is used as an RE translator or mixer in a typical receiver application. Component values depend on operating frequency.   (View)

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BATTERY_BACKUP_POWER

Published:2009/7/11 1:47:00 Author:May

Provides 60-Hz square-wave output for driving electronic timekeeping circuits from battery during AC power failure, 555 timer is connected as square-wave astable MVBR normally locked to incoming 60-Hz power frequency. Rt should be trimlned for zero beat wiih 60-Hz soulco. When primary power fails, reference voltage disappears and effect of C1 on frequency is minimized. 555 now oscillates at frequency determined by Rt and Ct, Which is 60 Hz. Use 6-V battery.-W. G. Jung, IC Timer Cookbook, Howard W. Sams, Indianapolis, IN, 1977,p 201-203.   (View)

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FSK_with_slope_and_voltage_detection

Published:2009/7/17 3:08:00 Author:Jessie

FSK with slope and voltage detection(courtesy Motorola Semiconductor Products Inc.).   (View)

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DEEP_OCEAN_VELOCIMETER

Published:2009/7/17 3:07:00 Author:Jessie

Sonic pulse produced by transducer s is sent along fixedlength water path at any depth and picked up by receiving transducer R． Received signal is then amplified and fed back to blocking oscillator to synchronize it at repetition rate determined by delay time of pulse in water. Pulses then go to cable-driving circuit, and through cable to surface vessel for counting.-L. Dulberger, Deep-Ocean Velocimeter Aids Sonar Systems Design, Electronics, 34:22, p 41-43.   (View)

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Voltage_controlled_resistor_with_linearizing_diodes

Published:2009/7/17 3:06:00 Author:Jessie

This circuit is essentially the same as that of Fig. 11-6, except that the linearizing diodes are included to improve noise performance of the resistor . EXAB Corporation Databook, 1990, p 5254   (View)

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SIMPLE_225_TO_400_MHz_AIR_BAND_RECEIVER

Published:2009/7/17 3:06:00 Author:Jessie

Tuning coil L2 can be wound with 2 turns of #22 wire on a 5/32 drill bit. This circuit is well behaved as long as a good component layout is used. The component leads must be kept short and neat, especially the leads of the transistor. The lengths should not exceed 3/16 . Audio could be tapped off the tuning coil with a 5-μF (or so) electrolytic capacitor, but the 1N82 diode circuit seems to produce less signal loss. The, RF signal from ANT1, an approximately 18 antenna, can be introduced through a small capacitor of 1 pF (or less) to the emitter of the 2N918. Other high-frequency transistors can be used, but might require different resistance in the regeneration circuit. The output of this circuit must go to an audio amplifier.   (View)

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PULSE_ENERGY_ERGMETER

Published:2009/7/17 3:06:00 Author:Jessie

Bolometer bridge converts input signal to heat by integrating input power with respect to time. Heat upsets bridge balance, and resulting signal is amplified and applied to peak-holding voltmeter that indicates energy directly. Used to measure energy content of pulses.-L. A. Rosenthal, Ergmeter Measures Bursts of Energy, Electronics, 31:23, p 79-81.   (View)

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SWITCHING_IMPROVES_REGULATOR_EFFICIENCY

Published:2009/7/17 3:05:00 Author:Jessie

In this circuit, a full-wave bridge is switched to a full-wale center tap to reduce regulator dissipation. SCR D6 switches between cottfieuraUons, When D6 is off, the circuit is an circuit is an FWCT rectifier using D1, D2, and D5, It applies 17 Vplus ripple to the regulator Input. The dron across the regulator supplies base driveto Q2. If Q2 is on, Q1 is off, and D6 is off. If the regulator voltage drops below about 3 V, Q2 turns off, and turns Q1 on, which turns on D6. This changes the circuit to an FW bridge USlng D1 through D4.   (View)

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Simple_integrator_using_an_ECG941_941D_941M_operational_amplifier

Published:2009/7/17 3:05:00 Author:Jessie

Simple integrator using an ECG941/941D/941M operational amplifier. Typical supply voltage is ±15 volts (courtesy GTE Sylvania Incorporated).   (View)

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TWO_DIMENSIONAL_TARGET_SIMULATOR

Published:2009/7/17 3:05:00 Author:Jessie

Two signals, one representing angular position of target and the other angular position of radar antenna, are fed to azimuth coincidence circuit. When signals coincide, indicating that antenna is pointing at target, delayed pulses representing a target are passed to radar ppi by azimuth gating circuit.-J. I. Leskinen, Four Ways to Simulate Radar Targets, Electronics, 31:23, p 82-86.   (View)

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EDDY_CURRENT_CLADDING_THICKNESS_GAGE

Published:2009/7/17 3:04:00 Author:Jessie

Low-frequency channel (47.5 kc) obtains thickness of cladding on reactor fuel elements. Probe is common element of each input bridge. Can also be used for measuring plating thickness or for detection of sub-surface cracks and voids.-W. J. McGonnagle, C. J. Renken, and R. G. Myers, Improved Nondestructive Testing by Eddy-Currents, Electronics, 32:35, p 42-43.   (View)

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Long_term_precision_integrator_for_such_things_as_pollution_monitoring

Published:2009/7/17 3:04:00 Author:Jessie

Long-term precision integrator for such things as pollution monitoring. The analog signal is applied to precision input amplifier model 52K, then to the V/F convener input. Model 458 is a 100 kHz V/F converter while model 460 is a 1 MHz V/F convener. The V/F output is connected to a large capacity counter and display, operating as a totalizer. The total pulse count is equal to the time integral of the analog input signal (courtesy Analog Devices, Inc.).   (View)

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Precision_integrator_using_the_Datel_AM_490_2_8_pin_TO_99_

Published:2009/7/17 3:03:00 Author:Jessie

Precision integrator using the Datel AM-490-2 8-pin TO-99 (courtesy Datel Systems, Inc.).   (View)

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