Circuit Diagram

TWO_STAGE_VARIABLE_FREQUENCY_CRYSTAL_OSCILLATOR

Published:2009/7/19 21:03:00 Author:Jessie

Operates at 9.1 kc with long-term frequency stability of a few parts per million. Frequency can be pulled up to 5 cps off resonance by adjusting trimmer capacitor in series with crystal. Used in analog and digital systems to achieve calibration by deviating carrier frequency a small but accurately known amount.-G. A. Gedney and G. M. Davidson, Crystal Oscillator has Variable Frequency, Electronics, 31:7, p 118-119.   (View)

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Frequency_compensation_circuit_using_an_ECG915_operational_amplifier

Published:2009/7/19 21:03:00 Author:Jessie

Frequency compensation circuit using an ECG915 operational amplifier. See table for component values. Supply voltage is±15 volts (courtesy GTE Sylvania Incorporated).   (View)

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DIRECT_COUPLED_AF

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

Combination of unipoiar and bipolar transistors gives desirable am plifying features of each solid-state device. Can be used as speech amplifier and for other low-level audio applications.-I. M. Gottlieb, A New Look at Solid-State Amplifiers, Ham Radio, Feb.1976, p 16-19.   (View)

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High_impedance_input_high_current_output_voltage_follower

Published:2009/7/19 21:02:00 Author:Jessie

High-impedance input, high-current output voltage follower (courtesy Motorala Semiconduntor Products Inc.).   (View)

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UNIVERSAL_POWER_CONTROLLER

Published:2009/7/10 5:08:00 Author:May

Relay K1 has a low-impedance coil and K2 has a high-impedance coil. When a sensor opens, current is routed through the coil of K1. K1 activates, opens its contacts, and prevents a sensor contact reclosure from affecting the circuit. When K1 contacts open, current to the main relay K2 is limited by the impedance of K1.K2 controls power to a load (air conditioner, furnace blower, etc.).   (View)

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STABLE_1_MC_OSCILLATOR

Published:2009/7/19 21:02:00 Author:Jessie

Gives frequency stability of one part in 1 billion per day at normal room temperature, at which a 12-Ib, 45-V battery can furnish crystal oven and circuit power for 72 hours.-J. F. Mercurio, Jr., Stable, Low-Cost One-Mc Oscillator, Electronics, 32:6, p 50-51.   (View)

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1_W_AT_6_V_

Published:2009/7/10 5:08:00 Author:May

Battery-operated power amplifier using National LM390 IC provides ample power for loudspeaker despite operation from 6-V portable battery.- Audio Handbook, National Semiconductor, Santa Clara, CA, 1977, p 4-41.   (View)

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0_20V_AT_2A

Published:2009/7/19 21:01:00 Author:Jessie

R3 provides control of output voltage for regulator built around LM3900 quad Norton opamp. Output is well regulated against both line and load variations and is free of ripple. Opamp sections A3 and A, provide over current sensing and shutdown functions; after out-put fault is cleared, S2 is closed momentarily to restore output power. Article describes circuit operation and initial setup in detail.-J. C. Han-isko and W. Wiseman, Variable Supply Built Around Quad Amp Outputs 2A, EDN Magazine, June 20, 1976, p 128 and 130.   (View)

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High_slew_rate_Power_amplifier_using_an_ECG941_941D_941M_operational_amplifier_

Published:2009/7/19 21:01:00 Author:Jessie

High-slew-rate Power amplifier using an ECG941/941D/941M operational amplifier (courtesy GTE Sylvania Incorporated).   (View)

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LINE_SWEEP_GENERATOR_FOR_ENCODER

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

Circuit is basically negative-feedback linearized R.C sawtooth generator in which charging voltage is held constant while negative end of sweep-forming capacitor is driven negative. Amplifier V8-V9A-V10A is direct-coupled throughout. Loop-stabilizing networks pass high-frequency components.-H. W. Gates and A. G. Gatfield, Scan Converter Aids Phone-Line Radar Relay, Electronics, 32:16, p 48-51.   (View)

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5V_AT_1A

Published:2009/7/19 20:59:00 Author:Jessie

Use of Darlington at output boosts power rating of standard opamp voltage regulator circuit. Article gives step-by-step design procedure. With μA741 opamp, circuit gives good regulation along with short-circuit protection. AC ripple is less than 2 mV P-P. Required input of 30V is obtained from conventional full-wave bridge rectifier with capacitor-input filter.-C, Brogado, IC Op Amps Simplify Regulator Design, EDN/EEE Magazine, Jan. 15, 1972, p 30-34.   (View)

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1__GHz_DIVIDE_BY_N_COUNTER

Published:2009/7/10 5:08:00 Author:May

Counter speeds for CMOS- and TTL-programmable counters are limited to under 100 MHz. ECLtype devices can approach a few hundred MHz, but with significant current requirements. However, coupling the dual-modulus-prescaling technique with the available phase-locked-loop synthesizer chips that control the prescaler circumvents these frequency and power-drain constraints. With this approach, designers can also choose various counter-programming schemes (serial, parallel, or data bus), in addition to achieving higher frequency capabilities. Low-power drain (less than 75 mW) and low-cost devices can also be selected. Moreover, only two ICs are necessary to achieve divide values above 131000. Maximum input frequency and dividing range for the counter are controlled by choosing an appropriate 8-pin dual-modulus prescaler. The counter's output appears at synthesizer pin FV (see the figure). The total input-to-output divide value is governed by the equation: NTOTAL=NxP+A N and A represent the value programmed through the serial port into the divide-by-JV and divide-by-A counters. P is the lower dual-modulus value that is established by the synthesizer's modulus-control signal. Typically, A varies from zero to P-1 to achieve steps within the system's divide range. N must be equal to or greater than A. N>A then sets a lower limit on jVTOTAL, which is dictated by AMAX=P-1.   (View)

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31_2_digit_DVM_using_an_IC_dual_ramp_system

Published:2009/7/19 20:59:00 Author:Jessie

31/2-digit DVM using an IC dual-ramp system. Three input ranges allow the DVM to measure DC voltages of 0 to 1.9999 volts, 0 to 19.99 volts and 0 to 199.9 volts(courtesy Motorola Semiconductor Products Inc.).   (View)

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15_V_AT_200mA

Published:2009/7/19 20:57:00 Author:Jessie

Linear regulator using Texas Instruments SN52105, SN72305, or SN72376 is connected for foldback current limiting. Regulators are interchangeable with LM105, LM305, and LM376 respectively. Load regulation is 0.1%, and input regulation is 0.1%/V.- The Linear and Interface Circuits Data Book for De-sign Engineers, Texas Instruments, Dallas, TX, 1973, p 5-9.   (View)

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VOLTAGE_TUNED_60_TO_90_MC

Published:2009/7/10 5:07:00 Author:May

Gives over 40 db gain with 50-ohm source and load.Untuned input allows constant source impedance over tunable frequency range of silicon XA585 voltage-variable capacitance diodes, with excellent stability and trctcking.-Texas Instruments Inc., Solid-Stale Communications, McGraw-Hill, N.Y., 1966, p 297.   (View)

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BIDIRECTIONAL_INTERCOM_

Published:2009/7/10 5:06:00 Author:May

Uses 759 power opamps to provide 0.5 W for 16-ohm loudspeakers. Crystal microphones feed NPN transistors that provide both inphase and 180o out-of-phase signals. Balance-adjusting circuits of am-plifiercancel outthe two signals, so only out-ofphase sigpal goes to receiving unit. Privacy switch across microphone eliminates audio feedback while listening. Artide tells how to calculate heatsink requirements.-R. J. Apfel, Power Op Amps-Their lnnovative Circuits and Packaging Provide Designers with More Options, EDN Magazine, Sept. 5, 1977, p 141-144.   (View)

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60_CPS_BANDSTOP_AMPLIFIER

Published:2009/7/10 5:05:00 Author:May

With fet as output buffer to give near-infinite load impedance, twin,T notch filter gives up to 50 db attenuafion at notch frequency.-FET's and RC Networks (Siliconix ad), Electronics, 39:4, p 71.   (View)

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FLYBACK_BLANKING

Published:2009/7/19 20:56:00 Author:Jessie

Amplifies blanking pulse from monostable mvbr sweep circuitto level required for blanking crt screen. Q26, normally nonconducting, is driven to saturation by blanking pulse, thereby applying high negative voltage to crt control grid.-C. E. Veazie, Transistorized Radar Sweep Circuits Using Low Power, Electronics, 32:26, p 46-47.   (View)

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HIGH_INPUT_IMPEDANCE_A_C_AMPLIFIER

Published:2009/7/10 5:05:00 Author:May

Gives input impedance of 30 meg without sacrificing bandwidth or noise performance.Voltage gain is 40 db, Technique involves bootstrapping fet Q1 and using fixed bias for its gate. Q2 is operoted grounded-base to reduce Miller capacitance of field effect at high frequencies.-Texus Instruments Inc., Transistor Circuit Design, McGraw-Hill,N.Y.,1963, p 520.   (View)

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HIGH_GAIN_VOLTAGE_STABILIZER

Published:2009/7/10 5:03:00 Author:May

Use of constant-currenl diode as collecfor load increases overall gain of amplifier from 500 to about 700.-T. K. Hemingway, Applications of the Constant-Current Diode, Electronics, 34:42, p 60-63.   (View)

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