Circuit Diagram

BASIC_DIGITAL_THERMOMETER_CELSIUS_AND_FAHRENHEIT_SCALES

Published:2009/6/29 2:02:00 Author:May

Maximum reading on the Celsius range is 199.9 ℃, limited by the (short-term) maximum allowable sensor temperature. Maximum reading on the Fahrenheit range is 199.9 °F (93.3 ℃), limited by the number of display digits. VREF for both scales is 500 mV.   (View)

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SLEW_RATE

Published:2009/6/29 2:01:00 Author:May

Circuit measures slew rate of input signal with Am685 comparator in circuit having delay-line length under 10 ns. When slew rate exceeds predetermined Iimit set by R6, comparator changes state and latches, turning on LED. Pushing reset switch restores normal operation. Based on comparison of input signal with time-delayed counterpart. Derivative of input signal, equal to its instantaneous slew rate, is measured accurately for swings of 6 V P-P as found in most 50-ohm video signals. Action is fast enough to detectglitches.—R. C. Culter, Slew-Rate Limit Detector is Simple, yet Versatile, EDN Magazine, Aug. 20, 1977, p 140－141.   (View)

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FREQUENCY_COMPARATOR

Published:2009/6/29 2:01:00 Author:May

Circuit using CA3096 transistor amay plus one discrete diode develops DC output voltage that is proportional to difference between frequencies of input signals f1 and f2. Maximum input frequency is 10 kHz.— Circuit Ideas for RCA Linear ICs, RCA Solid State Division, Somerville, NJ, 1977, p 17.   (View)

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1_W_NONINVERTING_WITH_SPLIT_SUPPLY

Published:2009/6/29 2:00:00 Author:May

Motorola MC1554 IC is connected for operation from ±7 V to provide voltage gain of 9 overfre。quency range（-3 dB）of 40 to 22,000 Hz，Inputimpedanceis 10K,and total harmonic distortionis is less than 0.75％， Use external heatsink，-″The MC1554 One-Watt Monolithic Integrated Circtiit Power AmpIifier， Motorola、 Phoenix,AZ,1972、AN-401、p 2   (View)

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POSITIVE_TEMPERATURE_SENSOR_COEFFICIENT_RESISTOR

Published:2009/6/29 2:00:00 Author:May

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FIBER_OPTIC_RECEIVER，VERY_HIGH_SENSITIVITY，LOW_SPEED，3nW

Published:2009/6/29 2:00:00 Author:May

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1_W_NONINVERTlNG

Published:2009/6/29 2:00:00 Author:May

Motorola MC1554 IC operates from single supply and uses capacitive coupling to both source and load, for voltage gain of 9 with frequency response (-3 dB) from 200 to 22,000 Hz. Input impedance is 10K, and total harmonic distortion is Iess than 0.75%.Use external heatsink.- The MC1554 One-Watt Monolithic Integrated Circuit Power Am-plifier, Motorola, Phoenix, AZ, 1972, AN-401, p 2.   (View)

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5_W_CLASS_A

Published:2009/6/29 2:00:00 Author:May

Three-transistor feedback loop gives excellent DC stability, while arrangement of two capacitors and resistor feeding loudspeaker keeps these capachors properly polarized as AF output voltage swings above and below zero Ievel.-R. H. Pearson, Novel 5-Watt Class A Amplifier Uses Three-Transistor Feed-back Circuit, Wl'reless World, March 1974, p 18.   (View)

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GROUND_REFERRED_CENTIGRADE_THERMOMETER_1

Published:2009/6/29 1:59:00 Author:May

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LOW_NOISE_TRANSFORMERLESS_PREAMP

Published:2009/6/29 1:59:00 Author:May

Noise performance of balanced microphone preamp is improved with instrumentation amplifier configuration of three opamps. Each half of LM387A is wired as noninverting amplifier.LM387A serves to amplify low-level signals VOUT while adding as little noise as possible, leaving common-mode rejection for LF356.- Audio Handbook, National Semiconductor, Santa Clara, CA, 1977, p 2-37-2-40.   (View)

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INDEPENDENT_HYSTERESIS_ADJUSTMENT

Published:2009/6/29 1:59:00 Author:May

Trip point and hysteresis of comparator opamp A1 can be adjusted independently, with trip point being determined by setting of R1 or programmed by DC voltage applied to R2. Opamp A2 provides polarity inversion and rectification of A2 output. Hysteresis control R8 is in feedback path from A2 back to A1. Amount of hysteresis is determined by ratio of R3 to R8. With values shown, circuit output levels are 0 and 5 V.—G.Tobey, Comparator with Noninteracting Adjustments, EDN|EEE Magazine, Oct, 1, 1971, p 43.   (View)

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TEMPERATURE_SENSOR_1

Published:2009/6/29 1:58:00 Author:May

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ZENEB_REFERENCE

Published:2009/6/29 1:58:00 Author:May

One section of RS3900 quad opamp is connected as comparator using zener D1 for reference voltage. When voltage applied to pin 13 by R1 exceeds breakdown voltage of zener D1, comparator amplifies difference voltage to produce output voltage high enough to turn on LED. Can be used for classroom demonstration of comparator action.Zener breakdown should be under 9 V. LED can be Radio Shack 276-041.—F. M. Mims, Semiconductor Projects, Vol. 2, Radio Shack, Fort Worth, TX, 1976, p 35－42.   (View)

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FIBER_OPTICS_HALF_DUPLEX_INFORMATION_LINK

Published:2009/6/29 1:58:00 Author:May

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Low_dropout_linear_regulator

Published:2009/7/25 4:21:00 Author:Jessie

Figure 8－126 shows a MAX666 linear regulator connected to provide a 5-V output. This circuit is useful for uninterruptible battery-backup applications, as well as forlow-power circuits that use batteries for maln power and optionally take powerfrom wall-cube ac adapters．The input-voltage range is 5.4 V to 16.5 V, quiescent current(VIN ＝10 V) is 20 μA, dropout voltage (with 100－mA load) is 400 mV，maximum load current (VIN＝6 V) is 500 mA and shutdown current is 5 μA，Figure 8-127 shows the efficiency curves．Notice that the pass transistor is externaland can be sized to handle the required power dissipation．If the dissipation is lowenough the MAX666 internal 50-mA power transistor can replace the 2N2905．TheMAX667 should also be considered In such cases. (The MAX667 has a larger, 250－mA pass transistor and lower dropout voltage.) MAXIM BATTERY MANAGEMENT CIRCUIT COLLECTION, 1994, P. 74．   (View)

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GROUND_REFERRED_CENTIGRADE_THERMOMETER

Published:2009/6/29 1:57:00 Author:May

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IC_precision_waveform_generator_with_variade_duty_cycle

Published:2009/7/25 4:21:00 Author:Jessie

These circuits are similar to that of Fig 5-47,exceptfor alternate timing configurations and a duty-cycle control, If two separate timing resistors are used (Fig. 5-48A), the output frequency is: f= 0.3/RC, where RA= RB = R. If one timing resistor is used (Fig. 5-48B or 5-48C), the output frequency is: f =0.15/RC. If the duty cycle is to be varied over a small range, it should be centered around a duty cycle of 50%.   (View)

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GROUND_REFERRED_FAHRENHEIT_THERMOMETER

Published:2009/6/29 1:55:00 Author:May

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IC_precision_waveform_generator

Published:2009/7/25 4:19:00 Author:Jessie

This circuit uses an XR-8038 to provide simultaneous sine, square, and triangle outputs, which can be sweep and frequency odulated,The frequency range is from 0.001 Hz to 200 kHz、with a variable duty cycle from 2％to 98％ Electrical characteristics、and phase relationships of the outputs, are shown in Figs.5-47B and 5-47C,respectively．The operating frequency is set by capacitor C at pin 10,and the timing resistors at pins 4 and 5 See Conditions in Fig.5-47B．   (View)

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0℃_100℃_THERMOMETER

Published:2009/6/29 1:55:00 Author:May

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