Circuit Diagram

MODULATOR_

Published:2009/6/25 22:09:00 Author:May

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BALANCED_MODULATOR_（＋12_Vdc_SINGLE_SUPPLY）

Published:2009/6/25 22:09:00 Author:May

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50_dB_BROADBAND_VIDEO

Published:2009/6/25 22:08:00 Author:May

RCA CA3018 fourtransistor array is connected as two pairs of common-emitter emitter-follower combinations, with two feedback loops providing high DC stabilhy. One path goes from emitter of Q3 back to input, and other goes from collector of Q4 to collector of Q1. Values of C1, C2, and C3 give low-frequency cutoff (3 dB down) of 800 Hz.Upper cutoff is 32 MHz.-E.M.Noll, Linear IC Principles, Experiments, and Projects, Howard W. Sams, Indianapolis, IN,1974, p 165-168 and 174.   (View)

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VIDEO_MODULATOR_

Published:2009/6/25 22:07:00 Author:May

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LINEAR_PULSE_WIDTH_MODULATOR

Published:2009/6/25 22:07:00 Author:May

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TELEPHONE_LINE_MONITOR

Published:2009/6/25 22:06:00 Author:May

Using rectified audio as a power supply, this monitor will send the telephone line audio into an 8 ohm speaker.   (View)

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TELEPHONE_OR_EXTENSION_TONE_RINGER

Published:2009/6/25 22:06:00 Author:May

This circuit uses ML8204/ML8205 devices. With the components shown, theoutput frequency chops between 512 Hz (fH1) and 640 Hz (fH2) at a10 Hz (fL) rate.   (View)

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RE_MODULATOR

Published:2009/6/25 22:05:00 Author:May

Capacitors C1, C3, C5, and C6 should be dipped mica. C4 and C7 are compression or piston trimmer types. R6 is PC-board mount trimpot. L1 is 6 tums of No.14 enameled wire, 3/8 inch I.D. by 3/4 inch long, tapped at 1 turn from top.   (View)

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HIGH_IMPEDANCE_VlDEO

Published:2009/6/25 22:04:00 Author:May

Compound seriesfeedback circuit using FET at input provides high input impedance and stable wideband gain for general-purpose video amplifier applica-tions.- FET Databook, National Semicon-ductor, Santa Clara, CA 1971, p 6-26-6-36.   (View)

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RF_DIFFERENTIAL_AMPLIFIER

Published:2009/6/25 22:04:00 Author:May

Uses RCAC CA3028A linear IC to provide power gain ofabout 32 dB at frequencies up to about 120MHz，Values of tuned circuits deρend on frequency used Unmarked resistors are on IC -D.DeMaw、Vndelstanding Linear ICs、QST， Feb1977、p19   (View)

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STABILIZED_BIAS

Published:2009/6/25 22:03:00 Author:May

Simple voltage-feedback loop stabilizes bias on direct-coupled FET and bipolar transistor stages. Arrangement uses constant-current source a2 to maintain stable bias voltage on base of 03. By choosing proper resistor values, DC voltage feedback from emitter of bipolar is made to control constant-cur-rent value. Any change in drain current pro-duces opposite change in constant-current value, for stabilizing bipolar. Article gives de-sign equation.-H. T. Russell, DC Feedback Stabilizes Bias on FETTBipolar Pair, EDN Magazine, Nov.15,1970, p 51.   (View)

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FCC_APPROVED_TELEPHONE_TONE_RINGER

Published:2009/6/25 22:03:00 Author:May

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POLARITY_IGNORlNG_VOLTAGE_FOLLOWER

Published:2009/6/25 22:02:00 Author:May

Absolute-value circuit is basically voltage follower A1 whose input is positive regardless of polarity of VIN. With positive input, inverting amplifier A2 is disconnected by D1. With negative input, inverting amplifier applies poshive input to voltage follower through D1. Output voltage is thus absolute value of input voltage.-R. J. Wincentsen, Absolute Value Circuit Uses Only Five Parts, EDN Magazine, Nov. 1,1972, p 44.   (View)

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TELEPHONE_TONE_RINGER

Published:2009/6/25 22:02:00 Author:May

This is a complete telephone bell replacement circuit with minimum external components with on-chip diode bridge and transient protection and direct drive for piezoelectric transducers.   (View)

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1PULSE_WIDTH_MODULATOR

Published:2009/6/25 22:02:00 Author:May

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PULSE_WIDTH_MODULATOR

Published:2009/6/25 22:00:00 Author:May

If the timer is triggered with a continuous pulse train in the monostabie mode of operation, the charge time of the capacitor can be varied by changing the control voltage at pin 3.In this manner, the output pulse width can be modulated by applying a modulating signal that controls the threshold voltage.   (View)

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TELEPHONE_STATUS_MONITOR_USING_AN_oPTOISOLATOR

Published:2009/6/25 22:00:00 Author:May

The LED indicates the status of a remote telephone. The light is off if the phone is hung up. It shines steadily if the phone is off hook, and it flashes on and off while phone rings and for 5 seconds after ringing stops. The flashing oscillator operates continuously but can drive the LED only when a ringing signal discharges the one shot capacitor to enable NAND gate G3. Thus, one oscillator handles several phone lines.   (View)

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PORTABLE_TONE_GENERATOR

Published:2009/6/25 21:58:00 Author:May

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PULSE_POSITION_MODULATOR

Published:2009/6/25 21:58:00 Author:May

The threshold voltage, and thereby the time delay, of a free-running oscillator is shown modulated with a triangular-wave modulation signal; however, any modulating wave-shape could be used.   (View)

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10_A_25_Vdc_SOLID_STATE_RELAYS

Published:2009/6/25 21:57:00 Author:May

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