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 flasher with a bistable version formed by SCRs works with low voltage incandescent lamps. The...
This circuit with transistors of the time was found in the magazine Radio Electroinics of June of...
The transistors of this timing circuit may be more modern types such as BC548 and BC558. The...