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 multiplies a time constant given by the input components. The circuit admits...
This circuit is nothing more than a powerful audio oscillator or buzzer with a power transistor. The...
An way to change the frequency of the previous oscillator (CIR112E) is to add a variable capacitor in the...