Circuit Diagram

Data_acquisition_IC_with_4_wire_microprocessor_interface

Published:2009/7/23 22:24:00 Author:Jessie

This circuit shows the basic interface connections between an 8-input LTC1090 data-acquisition IC and an Intel 8051 microprocessor．The 4-wlre serial interface includes chip-select CS, shift clock SCLK for synchronizing data bits, a data input DIN and a data output, DOUT. Data bits are transmitted and received simultaneously (full duplex), minimizing the transfer time. The external ACLK input controls the conversion rate, and can be tied to the SCLK, as shown, or can be derived from the system clock (the 8051 ALE pin), or it can be run asynchronously. When the ACLK pin is driven at 2 MHz, the conversion time is 22 μs. Consult the LTC1090 datasheet for further data.   (View)

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Negative_variable_voltage_reference_VSUBOUT_SUB_lower_than_reference_zener

Published:2009/7/23 22:24:00 Author:Jessie

This circuit is similar to that of Fig.10－47，except that a variable negative-voltage reference is provided for VOUT .   (View)

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900_KC_FLAW_DETECTOR

Published:2009/7/23 22:24:00 Author:Jessie

Attenuation of ultrasonic pulses boomed through test piece reveals presence and extent of internal defects, such as nonbonds between aluminum cladding and uranium core. Test piece and transducers are submerged in water to provide good coupling for 900-kc ultrasonic wave from barium titanate transducer of pulser. Motor sets discriminator threshold to equal signal received from attenuator.-J. D. Ross and R. W. Leep, Ultrasonic Pulses Detect Reactor-Slug Flaws, Electronics, 31:25, p 59-61.   (View)

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SOLID_STATE_TIMER

Published:2009/7/23 22:24:00 Author:Jessie

Uses fet constant-current source to eliminate timing errors due to unregulated power supplies and line transients. Range of 0.1 to 50 sec is con trolled by R2.-J. Geekie, Simple Fet Timer, EEE, 14:3, p 62.   (View)

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900_MHz_gain_controlled_amplifier

Published:2009/7/23 22:24:00 Author:Jessie

This circuit shows an SL2365 transistor array connected as a gain-controlled amplifier. The transistor-array connections are shown in Fig. 2-35B.The collector load of TR1 is a transformer that is composed of a 14-mm length of 75-Ω stripline resonated with a 1- to 6-pF variable capacitor. The transformer secondary is a small loop of stiff wire that is grounded at one end and located a few mm above the stripline. The noise figure at full gain is 9 dB.   (View)

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LINEAR_SAWTOOTH

Published:2009/7/23 22:34:00 Author:Jessie

Q1 and 02 in emitter-coupled mvbr and constant-current generator Q3 produce sweep having linearity comparable to that of vacuum-tube circuits.-B. Rakovic, One More Transistor Makes a Linear Sawtooth, Electronics, 35:49, p 50-51.   (View)

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STROBE_GENERATOR

Published:2009/7/23 22:33:00 Author:Jessie

Sweep comparator V1 mixes output of ramp generator and staircase generator to give sampling or strobe pulse. Instantaneous d-c level of ramp, cor responding to a step, fixes time at which strobe signal is generated.-W. E. Bushor, Sample Method Displays Millimicrosecond Pulses, Electronics, 32:31, p 69-71.   (View)

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SONAR_PEAK_AMPLITUDE_DETECTOR

Published:2009/7/23 22:33:00 Author:Jessie

Reshapes pulses from playback amplifiers handling pulse-amplitude-modulation timedivision multiplex signals recorded and reproduced in magnetic-tape storage system, to provide narrow 2-microsec pulses coinciding with reference playback dock and having amplitude proportional to peak amplitude of input pulse sample. Used in training sonar operators at land-based sonar.-M. H. Damon, Jr., Tape Target Classifier Trains Sonar Operators, Electronics, 33:13, p 65-69.   (View)

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Programmable_power_supply_negative_output

Published:2009/7/23 22:33:00 Author:Jessie

This circuit is similar to that of Fig. 6-62, except that the output is are shown in Fig. 6-63. To calibrate, apply 0111 to TTL latch, and adjust P1 for 5.200-V output.   (View)

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DUAL_OUTPUT_FREE_RUNNING_TIMER

Published:2009/7/23 22:33:00 Author:Jessie

Each output may be controlled separately. With stable power-supply voltage and constant ambient temperature, accuracy of 0.1% may be expected with this type of repeating timer. Switch is shown in off position, Load resistors RL1 and RL2 can be replaced with 500-ohm relay coil shunted by 1N2069 diode. -Texas Instruments Inc., Transistor Circuit Design, McGraw-Hill, N.Y., 1963, p 414.   (View)

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Battery_life_extender

Published:2009/7/23 22:33:00 Author:Jessie

This circuit extends the lifetime of a 9-V battery. The regulator remains in a quiescent state (drawing only 215 μA) until the battery voltage decays below 7.5 , at which time the circuit starts to switch and regulate the output at 7.0 V until the battery falls below 2.2 V. If this circuit is operated at a typical 80% efficiency with an output current of 10 mA, at 5.0-V battery voltage, the average input current is 17.5 mA.   (View)

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TKIANULES

Published:2009/7/23 22:32:00 Author:Jessie

Peaks, slopes, and frequency of triangular waves can be varied independently. R10-R11 control positive slope, R11-R15 negative slope, and C1-C2 both slopes. Zener voltages of D1-D2 determine peaks.-R. Zane, Triangle Generator Adjusts Output Slopes and Peaks, Electronics, 38:12, p 85-86.   (View)

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Variable_gain_differential_input_instrumentation_amplifier

Published:2009/7/23 22:32:00 Author:Jessie

The gain of this instrumentation amplifier can be set by selecting R6. The amplifier can be balanced by adjusting R1.   (View)

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60_KC_UNDERWATER_TRANSMITTER

Published:2009/7/23 22:32:00 Author:Jessie

Consists of oscillator, buffer, driver, and power amplifier feeding barium titanate projector. Bandwidth is 1 kc in 60-kc region. Used to monitor underwater mine operation as test ships pass over. Receiving hydrophone on bottom may be up to 600 feet away. When mine senses approach of target, relay K1 is activated, turning on transmitter.-M. J. Aucremanne and D. D. Woolston, Telemeter System Relays Undersea Ordnance Data, Electronics, 31 :41, p 84-87.   (View)

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Step_down_voltage_regulator_for_inputs_greater_than_30_V

Published:2009/7/23 22:32:00 Author:Jessie

Component values are tailored to circuit requirements as described for Fig. 4-2. Adding the zener allows battery voltage to increase by the zener value. For example, if a 24-V zener is used, maximum battery voltage can go to 48 V.However, addition of the zener does not alter the maximum charge of supply. With a 24-V zener, the circuit stops when battery voltage drops below 24 V + 2.2 V= 26.2V.   (View)

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Programmable_power_supply

Published:2009/7/23 22:32:00 Author:Jessie

The output of this 5-V digital supply can be trimmed above and below 5-V with digital-logic signals applied to IC1. The exact values for various combinations of logic signals are given in Fig. 6-62B. To calibrate, apply 1100 to IC1, and adjust P1 for 5.000-V output.   (View)

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SYNCHRONOUS_SWEEP

Published:2009/7/23 22:31:00 Author:Jessie

Produces linear 20-V sawtooth with four-layer diode and six other components. Maximum sweep role can reach 100 kc. Provides synchronous operation with good linearity and sufficiently Inst retrace to eliminate need for blanking in oscilloscope applications.-4-Layer Diode Sweep (Synchronous), Electronic Circuit Design Handbook, Mactier Pub. Corp., N.Y., 1965, p 173.   (View)

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CURRENT_MODE_SWITCH

Published:2009/7/23 22:39:00 Author:Jessie

With l,000-Mc lime base applied to base of Q2, two current. mode switches together serve to give ac curacy of 0.5 nsec in measurement of time intervals with quinary scaler.-R. Englemann, Quinary Scalers: Measure Time Intervals Digitally, Electronics, 37:5, p 34-36.   (View)

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Step_down_regulator_with_short_circuit_protection

Published:2009/7/23 22:39:00 Author:Jessie

With this circuit, the low-battery detector (LBD) is connected to sense the output voltage, and shuts off the oscillator by forcing pin 2 low if the output voltage drops. Component values are tailored to circuit requirements, as described in Fig. 4-2, except: choose resistor values so that R5= R3 and R4= R2, and make R8 25 to 35 times higher than R3.   (View)

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INTERVAL_TIMER

Published:2009/7/23 22:38:00 Author:Jessie

Interval is determined by C, which can be paralleled capacitors to in. crease range.-N. C. Hekimian, PNP-NPN CIRCUITS; New Look at a Familiar Connection, Electronics, 35:47, p 42-46.   (View)

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