Tools for physiology labs: inexpensive equipment for physiological stimulation

Area of Science:

• Neurobiology
• Physiology Education
• Biomedical Engineering

Background:

• Traditional physiological stimulation equipment can be prohibitively expensive for teaching laboratories.
• The need for reliable, low-cost tools is critical for both student education and faculty research in neurobiology.

Purpose of the Study:

• To design and present an inexpensive system for physiological stimulation suitable for neurobiology teaching.
• To develop a stimulus isolation unit (SIU) utilizing cost-effective DC-DC converters for safe, high-voltage pulse generation.

Main Methods:

• Designed a stimulus isolation unit (SIU) using DC-DC converters to generate isolated high-voltage power.
• Developed two stimulus timing control methods: a conventional analog pulse generator and a PC-interfaced digital microcontroller system.
• Tested the SIU's performance, including voltage output (up to 100 V), rise time (50 μs), and lack of offset.

Main Results:

• The developed SIU successfully generated high-voltage pulses (up to 100 V) with fast rise times (50 μs).
• The equipment demonstrated reliability and durability through intensive use in an undergraduate physiology laboratory.
• Both analog and digital timing control methods proved effective for stimulus delivery.

Conclusions:

• The designed inexpensive equipment and software provide a reliable solution for physiological stimulation in teaching and research.
• This project contributes to making advanced physiology equipment accessible, supporting educational and research endeavors.
• The SIU offers a cost-effective alternative to expensive high-voltage power sources for physiological experiments.