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 traditional TTL anti-clock setting was found in a 1993 American documentation. The circuit...
The AT21CS11 memory device offers an extended voltage range to accommodate lithium-ion battery...
This circuit shows on the screen of an oscilloscope two signals alternately at a frequency that depends...