This shield circuit was obtained from Radio Electronics magazine, July 1990. The triac is load and power grid dependent.
Using 555 integrated circuits, this alarm circuit was found in a 90s American documentation. The signal...
The time the output is high (1) of a TLCSSB in the astable configuration depends on Ra and C. The...
This high quality circuit with complementary symmetry was found in an Electronics World of 1966....