power supply circuit

10_bit_A_D_converter_interface_with_an_8_bit_bus_such_as_in_the_8080_control_structure

Published:2009/7/19 22:17:00 Author:Jessie

10-bit A/D converter interface with an 8-bit bus such as in the 8080 control structure (courtesy Analog Devices, Inc.).   (View)

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±65V_TRACKING_AT_1A

Published:2009/7/19 22:16:00 Author:Jessie

Circuit uses two LM143 high-voltage opamps in combination with zener reference and discrete power-transistor pass elements.Q1 is transistor used as stable 6.5-V zener voltage reference. Opamp A1 amplifies reference voltage from 1 to about 10 times for application through R10 to Darlington-connected transistors Q2 and Q3. Feedback resistor R5 is made variable so positive output voltage can be varied from 6.5 V to about 65 V. This output is applied to unity-gain inverting power opamp A2 to generate negative output voltage. Q2-Q5 should be on common Ther-malloy 6006B or equivalent fleatsink. Supply includes short-circuit protection. Maximum shorted load current is about 1.25 A.- Linear Applications, Vol. 2, National Semiconductor, Santa Clara, CA, 1976, AN-127, p 8-9.   (View)

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Cold_junction_compensation_for_type_K_thermocouple

Published:2009/7/19 22:16:00 Author:Jessie

This circuit shows an AD590 that is connected to compensate a type-K thermocouple. The reference junctions should be in close thermal contact with the AD590 case. V+ must be at least 4 V and ICL8069 current should be set at 1 to 2 mA. Calibration does not require shorting or removal of the thermocouple. Set R1 for V2= 10.98 mV. If very precise measurements are needed, adjust R2 to the exact Seebeck coefficient for the thermocouple used (measured or from table), then note V1 and set R1 to buck out this voltage (that is, set V2 to equal V1). For other thermocouple types, adjust values to the appropriate Seebeck coefficient.   (View)

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SATELLITE_TRANSMITTER

Published:2009/7/19 22:16:00 Author:Jessie

Novel phase modulator, based on bridged-T network, gives simple design dong with wide modulating capability. Transmitter has output of 300 mw at 108 Mc for telemetering data for up to 18 months from Van Allen radiation bell.-A. J. Fisher, W. R. Talbert, and W. R. Chittenden, Telemetry Transmitter for Radiation Satellite, Electronics, 33:19, p 68-69.   (View)

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LOW_ENERGY_PARTICLE_DETECTOR

Published:2009/7/19 22:16:00 Author:Jessie

Change in conductivity of single-crystal photocell under irradiation is converted to pulse-code modulation by neon glow-tube relaxation oscillator whose Firing rate is determined by charging of C1 through photocell. Saturating bootstrap amplifier Q2 inverts and shapes pulses to drive accumulation register-J. W. Freeman, Energy Detector for Satellites, Electronics, 35:4, p 42-43.   (View)

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0_TO__66V_AT_5mA

Published:2009/7/19 22:13:00 Author:Jessie

Voltage follower A2 buffers output that can be adjusted over full range from 0 V to zener limit with R4. Positive supply of A2 must go to voltage slightly more positive than +3 V common if linear output operation is required over full range.-W. G. Jung, IC Op-Amp Cookbook, Howard W. Sams, Indianapolis, IN, 1974, p 159-160.   (View)

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Differential_thermometer

Published:2009/7/19 22:13:00 Author:Jessie

This circuit shows two AD590s and an op amp that is connected to measure temperature differential. The 50-kΩ potentiometer trims offsets in both devices, and can be used to set the size of the difference interval. The circuit can be used for liquid-level detection (if there is a measurable temperature difference in the liquid at different levels). Harris Semiconductors Data Acquisition) 1991 p. 12-9   (View)

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Centigrade_thermometer

Published:2009/7/19 22:13:00 Author:Jessie

This circuit shows an AD590 and a low-current op amp that are connected to form a 0 to 100℃ thermometer. The readout is a 100-μA meter, which is adjusted by the Zero Set and Full-Scale Adjust potentiometer so that 1μA indicates 1℃, 10μA indicates 10℃, and so on. Harris Semiconductor Data Acquisition 1991 p 12-9   (View)

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7_23V_AT_12_2A

Published:2009/7/19 22:12:00 Author:Jessie

Ground terminal of LM340T-05 regulator is raised by amount equal to voltage applied to noninverting (+) input of opamp, to give output voltage set by R2 in resistive divider. Short-circuit protection and thermal shutdown are provided overfull output range.- Linear Applications, Vol. 2, National Semiconductor, Santa Clara, CA, 1976, AN-103, p6-7.   (View)

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LUNAR__PROBE__TRANSMITTER

Published:2009/7/19 22:10:00 Author:Jessie

Five subcarrier channels are rsed in f-m/p-m systems to transmit ion density, two levels of micrometeorite particle impacts, magnetic field strength, and compartment temperature. Strength, and compartment temperature. Output stage uses four transistors in push-pull parallel to give 400mv output.-R. R. Bennett et al., Circuits for Space Probes, Electronics, 32:25, p 55-57.   (View)

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500000_PPS_SCALER

Published:2009/7/19 22:09:00 Author:Jessie

Uses seven fast gasfilled decade counter tubes driven by transistors, for counting pulses from nuclear radiation detector. Input channel, which can accept positive or negative pulses from 0.1 to100 v, has amplitude discriminator and coincidence-anticoincidence gating.-M. Birk, H. Brafman, and J. Sokolowski, Transistors Drive Half-Megacycle Cold-Cathode scaler, Electronics, 34:41, p 60-61.   (View)

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MALFUNCTION_MONITOR

Published:2009/7/19 22:09:00 Author:Jessie

Used for monitoring missile in light while maintaining radio silence of telemetry transmitter unless abnormal condition is detected. After arming of missile, monitor can be used to transmit missile kill data.-R. C. Wright, Collecting Data from Live Missiles in Flight, Electronics, 34:12, p 46-49.   (View)

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Microprocessor_controlled_TTY_to_A_D_convener_interface

Published:2009/7/19 22:09:00 Author:Jessie

Microprocessor-controlled TTY-to-A/D convener interface. The AD7570 is a 10-bit CMOS A/D convener (courtesy Analog Devices, Inc.).   (View)

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Single_setpoint_temperature_controller

Published:2009/7/19 22:09:00 Author:Jessie

In this circuit, the AD590 produces a temperature-dependent voltage across R (C is for filtering noise). Setting R2 produces a scale-zero voltage. For the Celsius scale, make R=1 kΩ and VZERO=0.273 V. For the Fahrenheit scale, R=1.8kΩand VZERO=0.460V. Harris Semiconductors. Data Acquisition 1991 p 12-8   (View)

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O_20V_HIGH_PRECISION

Published:2009/7/19 22:07:00 Author:Jessie

National LM199 temperature-stabilized 6.95-V reference feeds LM108A opamp that is buffered by LM195K power transistor IC which provides full overload protection.- Li near Applications, Val. 2, National Semiconductor, Santa Clara, AN-161,p6.   (View)

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NEUTRON_COUNTING_TRANSMITTER

Published:2009/7/19 22:07:00 Author:Jessie

Used with cosmic-ray neutron counter to drive con ventional radiosonde. Signals above preset amplitude trigger subcarrier gate that in turn frequency-modulates r-f carrier.-L. Hillman and R. C. Haymes, Modifying a Telemetry System for Balloon-Borne Neutron Detection, Electronics, 34:11, p 60-63.   (View)

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BOOSTING_OUTPUT_CURRENT

Published:2009/7/19 22:06:00 Author:Jessie

External NPN pass transistor is added to each section of LM125 precision dual tracking regulator to in-crease maximum output current by factor equal to beta of transistor. To prevent overheating and destruction of pass transistors and result, ant damage to regulator, series resistor RCL, is used to sense load current. When voltage drop across RCL equals current-limit sense voltage in range of about 0.3 to 0.8 V (related to junction temperature), regulator will current-limit. Maximum load current is about 1A for 25℃ junction and 0.6 ohm for RCL. LM125 provides ±15V, LM126 provides ±12V, and LM127 provides +5V and -12V.-T. Smathers and N. Sevastopoulos, LM125/LM126/LM127 Precision Dual Tracking Regulators, National Semiconductor, Santa Clara, CA, 1974, AN-82, p 5.   (View)

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Sample_and_hold_interface_with_an_AD571_10_bit_A_D_converter

Published:2009/7/19 22:06:00 Author:Jessie

Sample-and-hold interface with an AD571 10-bit A/D converter (courtesy Analog Devices, Inc.).   (View)

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±15V_TRACKING_1

Published:2009/7/19 22:04:00 Author:Jessie

Arrangement uses LM104 negative regulator to track positive regulator, with both regulators adjusted simultaneously by changing R1. Inverting opamp can be added to provide negative output voltage while using positive voltage as reference.-R. C. Dobkin, One Adjustment Controls Many Regulators, EDN Magazine, Nov. 1, 1970, p 33-35.   (View)

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ARITHMETIC_BINARY

Published:2009/7/19 22:03:00 Author:Jessie

Uses 2N501 series-triggered transistors, catching diodes, and peaking coils operating at date input rate of about 15 Mc, in neutron time-of-flight and pulsed-neutron measurements.-E. J. Wade, Digital Instrumentation for Nuclear Research Tests, Electronics, 33:43, p 68-71.   (View)

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