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 circuit was found in the Linear Applications Handbook of the National Semiconductor of 1994....
This oscillator with the 4049 can generate signals up to about 14 MHz according to the article in the...
This circuit of a voice-controlled switch, Vox or sonic switch was obtained in a Popular...