Circuit Diagram

Video_amplifier_dc_stabilizer_differentially_sensed_technique

Published:2009/7/22 22:21:00 Author:Jessie

In this circuit, sensing is done differentially, preserving access to both fast amplifier inputs. A1 measures the dc error at the A2 input, and biases the offset pins to force offset within 50 μV. The offset-pin biasing at A2 is arranged so that A1 is always able to find the servo point. The 0.01-μF capacitors rolls off Al at the low frequency, and A2 handles the high-frequency signals. The combined characteristics yield: gain-bandwidth of 45 MHz, offset voltage of 50 μV, offset drift of 1 μV/℃, and a slew rate of 250 V/μs.   (View)

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Optically_controlled_regulator_shutdown

Published:2009/7/22 22:20:00 Author:Jessie

This circuit shows a 4N26 that is used to shut down a voltage regulator. To ensure that the regulator is shut down, input current to the 4N26 LED must be a minimum of 5 mA (to produce 1 mA at thq 4N26 output).   (View)

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WAVEFORM_TESTER

Published:2009/7/22 22:20:00 Author:Jessie

Used in high-speed testing of ferrite cores, transistors, transformers, and other components requiring waveform measurement. Based on sampling of un known waveform at discrete intervals and comparing resulting digital output with that provided by perfect component.-B. Agusta, Sorting Components by Measuring Waveforms, Electronics, 32:7, p 56-59.   (View)

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P87C766 Single-chip Microcomputer Integrated Circuit

Published:2011/7/28 22:12:00 Author:Michel | Keyword: Single-chip, Microcomputer, Integrated Circuit

P87C766 is single-chip microcomputer integrated circuit produced by Phlips Company and it is special main control chip of ChangHong DT2000 frequency doubling color TV electric set. First,Function Features　P87C766 contains the CPU (central processing unit), the I2C bus circuit, OSD showing circuit, all kinds of identification signal circuit, all sorts of function control circuit, and some other auxiliary functions circuit. Second,Pins Functions and Data P87C766 IC adopts feet 42 DI{ package and P87C766 on DT2000 color TV and its pins functions and data are shown as table 1.The voltage of the table, change means that it is in unstable condition when the voltage is measured.   (View)

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Optically_coupled_RS_flip_flop

Published:2009/7/22 22:16:00 Author:Jessie

This circuit uses two 4N26 couplers to form an RS circuit with two stable states. A +2-V signal at the set input changes the output from low to high, and a +2-V signal at the reset input returns the output to low. The input pulse width must be 3 μs (minimum).   (View)

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RESISTANCE_CHECKER

Published:2009/7/22 22:15:00 Author:Jessie

Amplified error voltage from Wheatstone bridge feeds 75-0-75 microammeter to indicate whether resistance under test is higher or lower than desired value und within preset tolerance. Instrument range is 9,999 ohms in 1-ohm steps. Gives go-no-go indication, to speed production testing.-D. S. Randall, Go No-Go Meter Speeds Resistance Check, Electronics, 31;9, p 66-68.   (View)

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FEED_FORWARD_OPAMP

Published:2009/7/6 6:51:00 Author:May

DC input characteristics are determined by A1, which is bypassed at high frequencies, while AC-coupled A2 deter-mines dynamic performance. Resulting composite amplifier combines such desired properties as low input current and drift, large bandwidth and slew rate, and fast settling time. Compensation network C3-C4-C5 is chosen first to give desired bandwidth. Composite rolloff of 6 dB per octave is then obtained by narrow-banding A1 with R4 and C2, so gain-bandwidth product is equal to ratio between unity-gain crossover frequency of A2 and open-loop gain.-Fairchild Linear IC Contest Winners, EEE Magazine, Jan. 1971, p 48-49.   (View)

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CAPACITANCE_MU_LTIPLIER

Published:2009/7/6 6:49:00 Author:May

Resistance ratio determines factor by which value of C1 is multiplied when used in simple opamp circuit shown. With values shown, ratio is 1000 and 10-μF capacitor provides effective capacitance of 10,000μF. Q of circuit is limited by effective series resistance, so R1 should be as large as practical. Opamp type is not critical- Signetics Analog Data Manual, Signetics, Sunnyvale, CA, 1977, p 640-641.   (View)

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MINIMIZING_PHASE_ERROR

Published:2009/7/6 6:48:00 Author:May

Phase compensation circuit trimmed by R2 keeps phase error of LM118 opamp well below 1° from DC to 200 kHz. In-phase error due to gain peaking is also low. Feed-forward network connected to pin 8 improves stability, making feedback capacitor unnecessary. Step response has about 30% overshoot, and sine response has about +1 dB of peaking before going 3 dB down at about 2 MHz.-R. A. Pease, Technique Trims Op-Amp Amplifiers for Low Phase Shift, EDN Magazine, Aug.20,1977, p 138.   (View)

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Minimum_component_phono_amp

Published:2009/7/22 22:11:00 Author:Jessie

This circuit shows an LM380 power-amplifier IC used as a phono amplifier The circuit has a voltage-divider volume control, with high-frequency rolloff tone control, and provides about 2.5 W to an 8-Ω speaker.   (View)

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SINGLE_ENDED_JFET

Published:2009/7/6 6:47:00 Author:May

Basic JFET amplifier is virtually free from popcorn noise problems of bipolar transistors and bipolar-input opamps. Combining JFET transconductance amplifier with current-to-voltage opamp adds high voltage gain and simplifies circuit applications. Gain-limiting 7.5K FET drain resistor is by passed and removed from gain equation. Parameter variation problems are minimized by biasing FET source through 15.1K resistance to negative supply. Gain variations are minimized by leaving 100 ohms of this resistance unby-passed.-L. Maxwell, FET Amplifiers-Take Another Look at These Devices, EDN Magazine, Sept. S, 1977, p 161-163.   (View)

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SIGN_CHANGER

Published:2009/7/6 6:46:00 Author:May

When switch S1 grounds pin 3 of opamp, circuit becomes inverter providing 180° phase shift. When S1 is at position A, input voltage acts on both inputs of A1 and no current flows through R1 and R2; output voltage is then equal to input voltage. Switch permits remote programming of phase reversal. For higher input impedance, 1556 opamp can be used.-W. G. Jung, IC Op-Amp Cookbook, Howard W. Sams, Indianapolis, IN, 1974, p 208-209.   (View)

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ABSOLUTE_VALUE_RECTIFIER

Published:2009/7/6 6:46:00 Author:May

Use of CA3140 bipolar MOS opamp in inverting gain configuration give symmetrical full-wave output when equality of design equations is satisfied. Bandwith for -3 dB is 290 kHz, and average DC output is 3.2V for 20V p-p input.- Circuit Ideas for RCA linear ICs, RCA Solid State Division, Somerville, NJ, 1977, p 18.   (View)

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DEAD_BAND_RESFONSE

Published:2009/7/6 6:45:00 Author:May

With bridge in feed-back loop of opamp, low-level input signals give essentially 100% feedback around A1 so there is very little output voltage. When input current through R1 rises above allowable current limit of circuit, bridge opens and output voltage jumps to new level determined by R2. Input is then amplified by ratio of R2/R1 in normal linear manner. Circuit thus has dead-band property for low levels. Value of R1 sets threshold level.-W. G. Jung, IC Op-Amp Cookbook, Howard W. Sams, Indianapolis, IN, 1974, p 206-207.   (View)

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SUMMING_WITHOUT_ADJUSTMENTS

Published:2009/7/6 6:44:00 Author:May

Single-stage opamp for analog computation provides high-precision output that is function of multiple input variables. Circuit drift is less than 2μV per month, eliminating need for periodic calibration while ensuring long-term accuracy. Opamp is Precision Monolithics op-07A.-D. Soderquist and G. Erdi, The op-07 Ultra-Low Offset voltage op Amp-a Bipolar Op Amp. That Challenges Choppers, Eliminates Nulling, Precision Monolithics, Santa Clara, CA, 1975, AN-13, p 11.   (View)

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3_W_PULSE_AMPLIFIER

Published:2009/7/6 6:43:00 Author:May

Motorola MC1554 power amplifier provides voltage gain of 18 for peak pulse power output up to 3 W Maximum peak output current rating of 500 mA for IC should not be exceeded during peak of output pulse.- The MC1554 One-Watt Monolithic Integrated Circuit Power Amplifier, Motorola, Phoenix, AZ, 1972, AN-401, p 3.   (View)

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PRECISE_RECTIFICATION

Published:2009/7/6 6:42:00 Author:May

Use of opamp in combination with silicon diode overcomes nonlinearity of diode at forward voltages under about 0.5 V. Offset-voltage pot is adjusted for symmetrical output waveform for small input voltages. D1 is connected in opamp feedback path so initial forward voltage drop required to make diode conduct is supplied by amplifier output. Second feedback path through D2 prevents output saturation on input half-cycles for which Dl is reverse-biased.-G. B. Clayton, Experiments with Operational Amplifiers, Wire-less World, June 1973, p 275-276.   (View)

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DIFFERENTIAL_JFET_INPUT

Published:2009/7/6 6:42:00 Author:May

Differential connection of National NPD5565 dual JFET is used when balanced inputs and low distortion are main requirements for AC amplifier, Combination with LF356 opamp shown gives gain of about 500. Noise is somewhat higher than with single-ended JFET.- FET Databook, National Semiconductor, Santa Clara, CA, 1977, p 6-17-6-19.   (View)

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POWER_BOOSTER_1

Published:2009/7/6 6:41:00 Author:May

Opamp power booster is used after conventional opamp when greater power-handling capability is required. 741 opamp circuit shown will drive moderate loads. Other opamps may be substituted in power stage if value of R1 is appropriately changed.- Signetics, Analog Data Manual, Signetics, Sunnyvale, CA, 1977, p 640-642.   (View)

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JFET_INPUT

Published:2009/7/6 6:40:00 Author:May

U401 dual JFET acting as preamp for standard bipolar opamp uses CR033 N-channel JFET as 330-pA current source. R4 is used to null initial offset. R3 is adjusted for minimum drift.- Analog Switches and Their Applications, Siliconix, Santa Clara, CA, 1976, p 7-51.   (View)

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