This flasher circuit consists of an astable multivibrator with the frequencies given by the capacitors. The circuit is from 1965 using light bulbs, but LEDs can be used. Power comes from 4 batteries.
This two-digit timer was found in the 1983 Special Projects issue of Radio Electronics magazine. The...
This high sensitivity circuit was found in the July 1992 Radio Electronics magazine. The circuit...
This circuit was found in an American 80's circuit board. The components used are current except the...