Biomedical subjects

T N Solie

Publications and source records attributed to T N Solie.

11 recordsLinked to original sources

PubMed1992

A programmable stimulator for electrophysiological studies.

We report on the design and construction of a programmable stimulator for use by neuroscientists. The stimulator is small, lightweight, and low powered. It generates positive, negative, or positive and negative pulses with widths and periods programmed by the user. The stimulator has ten parallel outputs to enable it to drive ten preparations at one time. It operates from 50-60 Hz, 115 v AC or 230 v AC and had a nominal peak-to-peak output of 30 volts. A liquid crystal display was used for the user interface and the timing was software-generated by a mincrocontroller.

Electric Stimulation↗

PubMed1989

An analog data acquisition board for the Macintosh II.

The Macintosh II has the hardware to make a good scientific data acquisition and data processing machine. The data acquisition boards currently available do not sample multiple channels simultaneously. They are also relatively slow. We have designed a fast Analog-to-Digital Board for the Macintosh II that samples eight channels at once. This board acquires data with sampling periods from 1 microsecond to 1.6777215 seconds in increments of 100 nanoseconds. Any jitter is due to the stability of the clock which is about one part per billion. The actual analog-to-digital conversion time is 500 nanoseconds with another 500 nanoseconds taken up by the track-and-hold amplifier acquisition time and the multiplexer setting time. The board samples as many as eight channels, giving 12-bit resolution for signals between plus and minus 2.5 volts. For eight channels the maximum Nyquist frequency is 62.5 KHz. The board will acquire single-channel data that has frequencies up to 500 KHz. Simultaneous comparisons of two channels can be made for signals that have a highest frequency component of 250 KHz. Thirty-eight integrated circuits were used on a single-slot board that connects to the Macintosh II's 32-bit NuBus.

Analog-Digital Conversion↗

PubMed1987