This circuit is from an old Mullard (Philips) manual with applications using the 555. Choosing appropriately the resistors and the timing capacitors, the ranges obtained can exceed days.
This circuit is from a Radio Electronics from October 1970. The circuit uses transistors from that...
This circuit, found in a 1985 documentation, causes two incandescent lamps to flash alternately. The...
This circuit was found in a 1987 edition of the United States' Hands-On Electronics magazine. The...