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Search indexed NASA NTRS and DOE OSTI research on propulsion, heat transfer, battery materials and energy systems. Follow report and document links to the original sources.

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At least 1,567 records · Page 87

All sources NASA NTRS DOE OSTI

NASA NTRS1970

Holographic analysis of printed circuit boards

Nondestructive measurement of elastic and plastic deformation in soldered joints and printed circuit boards by holographic interferometry

Jenkins, R. W.↗

NASA NTRS1971

Improved methods of forming monolithic integrated circuits having complementary bipolar transistors

Two new processes form complementary transistors in monolithic semiconductor circuits, require fewer steps /infusions/ than previous methods, and eliminate such problems as nonuniform h sub FE distribution, low yield, and large device formation.

Bohannon, R. O., Jr.↗

NASA NTRS1971

Active parallel redundancy for electronic integrator-type control circuits

Circuit extends concept of redundant feedback control from type-0 to type-1 control systems. Inactive channels are slaves to the active channel, if latter fails, it is rejected and slave channel is activated. High reliability and elimination of single-component catastrophic failure are important in closed-loop control systems.

Peterson, R. A.↗

NASA NTRS1971

Wein bridge oscillator circuit

Circuit with minimum number of components provides stable outputs of 2 to 8 volts at frequencies of .001 to 100 kHz. Oscillator exhibits low power consumption, portability, simplicity, and drive capability, it has application as loudspeaker tester and audible alarm, as well as in laboratory and test generators.

Lipoma, P. C.↗

NASA NTRS1971

Coarse roll-rate gain-control circuit

Circuit is used in spin-rate computing unit of control system for solar pointing rocket during its acquisition mode. Direction cosines from magnetometers and coarse sun sensors derive function that is approximately roll-rate times sum of absolute value of direction cosines.

Cooke, W. A.↗

NASA NTRS1971

Portable circuit-interruption indicator

Device locates transient power interruptions occurring in electrical equipment. Indicator operates on principle that circuit in normal use retains residual current in the line prior to an interruption.

Bezant, K. R.↗

NASA NTRS1971

Novel shift register eliminates logic gates and power switching circuits

Register requiring two integrated circuits per stage has nominal power dissipation of 3.5 mW per stage, its use eliminates reset pulse, allowing data transfer to occur in less than 1 microsecond, and eliminates power application to both right and left portions of the register simultaneously.

Cliff, R. A.↗

NASA NTRS1971