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.
July 2017 - The new Texas Instruments UCC20520 isolated drivers are already in the stock of Mouser...
The circuit shown in the figure can be used to detect the operation of infrared sources whose...
This 2005 circuit from a Linear Technology manual makes use of the LTC610HV and an optical coupler that...