This passage alarm was found in the April 1971 Radio Electronics magazine. Instead of R1, a 47k trimpot can be used to adjust the sensitivity according to the phototransistor used.
Passage Alarm (CB24116E)
- Details
- Written by: Newton C. Braga
This passage alarm was found in the April 1971 Radio Electronics magazine. Instead of R1, a 47k trimpot can be used to adjust the sensitivity according to the phototransistor used.
