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NOISE HOMEPAGE » INSTRUMENTS » EDUCATIONAL » SUB$10 PHOTOGATEVARIANTS


SUB-$10 SOUND CARD PHOTOGATE VARIANTS


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PUBLICATION

 * Z. Gingl, Sub-$10 sound card photogate variants, submitted to The Physics
   Teacher


CONNECTING THE SENSOR TO THE MICROPHONE INPUT


Ambient light phototransistor (TEPT4400) connected to the 3.5mm jack.
The microphone input of the sound card should be used.


Infrared phototransistor (SFH309F) connected to the 3.5mm jack.
Heat shrink tubes are used to isolate the wires from directly touching them.
The light source can be a flashling, alternatively one can use an infrared LED
(like the SFH409) connected to the USB port.



RELATED PAGES

 * Design Fundamentals for Phototransistor Circuits
 * Photocells, a.k.a CdS cells, photoresistors, LDR (light dependent resistor)
 * How to connect photoresistors
 * M. Horton, The $10 photogate, The Physics Teacher (December 2010) Volume 48,
   Issue 9, pp. 615
 * R. Dwayne Ramey, An Inexpensive Computer-Controlled Photogate,The Physics
   Teacher (March 2005) Volume 43, Issue 3, pp. 169
 * Jim's Homemade Spud Gun / BBMG / Airsoft / Paintball Chrono & ROF Meter Page


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