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.
We find this circuit in a 1980s documentation. The circuit can be applied to modern operators with...
This high power dimmer uses a unijunction transistor to trigger the triac. The triac is choosen...
This simple voltage-controlled oscillator generates signals from 300 Hz to 1,500 Hz with voltages from...