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- Optical switch with photo sensors
- Electronics Reference Library – Bill
- QRZ Ham Radio
- Open Source Hardware – OSHW Draft Definition

Can you help me to find circuits which uses photo-sensors.and if you do have them, would you please send them to me.

Basic Electricity – Start here if you don’t know anything about electricity or electronics. These pages cover the basics. They are great for young students.

QRZ was founded in 1992 by Fred Lloyd, AA7BQ as a spinoff of what was once called the “Callsign Project”, a cooperative effort designed to obtain and distribute FCC database tapes.

OSHW Draft Definition 0.3 is based on the Open Source Definition for Open Source Software and draft OSHW definition 0.2, further incorporating ideas from (more…)