Other
“Building a home made rain alarm. This circuit beeps for about 40 seconds when it detects rain. This circuit uses a 555 timer. This circuit can also be used with pressure sensor or with LDR for detecting light”
Content for BC177
The BC177 and BC177B are silicon Planar Epitaxial PNP transistors in TO-18 metal case. They are suitable for use in driver stages, low noise input stages and signal processing circuits of television reveivers. The NPN complementary types are BC107 and BC107B respectively.