{"id":241,"date":"2024-09-17T00:32:10","date_gmt":"2024-09-17T00:32:10","guid":{"rendered":"https:\/\/leech.caltech.edu\/wp\/?page_id=241"},"modified":"2024-09-19T16:59:52","modified_gmt":"2024-09-19T16:59:52","slug":"favorites","status":"publish","type":"page","link":"https:\/\/leech.caltech.edu\/cntl\/?page_id=241","title":{"rendered":"Favorites"},"content":{"rendered":"\n
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Many of the Lab\u2019s projects are one-off solutions for a specific need. But some of our inventions are more broadly applicable. This page lists some of the most popular examples. These are now almost off-the-shelf parts. If you could use one, we can build you one quickly. We may even start offering them for sale in the future.<\/p>\n\n\n\n

Phototransistor amplifier<\/h3>\n\n\n\n

In visual neuroscience, the exact time a stimulus is presented on a computer screen often needs to be documented along with recorded responses. Since contemporary computer hardware introduce a delay between the time the software instructs a screen refresh and the screen\u2019s response, a common solution is to tape a photosensor to a corner of the computer screen. We have developed a sensor with readout electronics that is largely insensitive to lighting conditions and overall screen luminance. Powered from a standard 5V (USB) source, the system\u2019s output is a TTL-compatible signal that can be captured with any DAQ system or an Arduino.<\/p>\n\n\n\n

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Linear LED controller<\/h3>\n\n\n\n

The single most-repeated request to the Neurotech Lab is for a linearly controlled high-intensity LED. These get used for microscopy, illuminating behavior rigs, even for optogenetic stimulation. We have developed a circuit that can be controlled in one of three ways:<\/p>\n\n\n\n