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.
The power supply is indicated for the supply small 6 V motors with current up to 500 mA. The...
The operational amplifiers of this circuit can be replaced with more modern equivalents. The power...
This nonlinear gain circuit was found in a 1965 Electronic Design. The configuration can be used...