Automatic circuit tester with improved voltage regulator

Details Automatic circuit tester with improved voltage regulator Automatic circuit tester with improved voltage regulator

1979-11-20

1981-09-22

Malzahn, David H.

Excavating

324 73AT, G06F 1122

Patent

active

042914043

ABSTRACT:
A battery operated microcomputer controlled programmable circuit testing device. Standard I/O/memory devices (25a, 25b) are connected to a microcomputer (20) in such a manner as to treat the I/O ports (46, 47) of the I/O memory devices as programmable interfaces and to allow pin receptors in a socket (10) to be individually programmed as inputs or outputs. Double detent switches (12, 13) connected to testable inputs T0, T1, 45) the microcomputer are used to scroll a roll table containing names of devices which may be tested in either a forward or a reverse direction at two different speeds. Compression of the roll table storage is provided by storing only data which differs from the previous element. A power supply (17) having a regulator featuring a series pass transistor (150) connected as a common collector amplifier is shown. The power supply is turned on and off by switching devices (11, 151, 160, 159) which control base current only to a transistor switch (155, 170) operating analog circuitry (157) which controls the pass transistor. Microcomputer control (181) of the power supply and self latching embodiments are also shown. The power supply shown herein can successfully regulate output voltages which differ from the raw DC input by no more than the saturation voltages of series pass transistor.

REFERENCES:
patent: 3691531 (1972-09-01), Saltini et al.
patent: 4108358 (1978-08-01), Niemascyk et al.
patent: 4168527 (1979-09-01), Winkler
patent: 4174805 (1979-11-01), Fulks et al.
patent: 4180203 (1979-12-01), Masters
Schwab, "IC Testing: A Complete System", Kilobaud the Small Computer Magazine, Nov. 1978, pp. 70-80.
Ruckdeschel, "IC Logic Tester and Parallel I/O Expander Kilobaud Microcomputing, Jul. 1979, pp. 26-39.
Tang, "Discrete Regulator Design Regulates Close to Supply Bus", Electronic Design, Aug. 2, 1980, p. 102.

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